COLOR NET RECORDER

CN-24

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 C
Yo ur L o c al A g e nt/D e aler

9-52, A shihara-cho,
N ishinom iya, Japan

Te l e p h o n e : 0 7 9 8 -6 5 -2 111
Te l e f a x : 0798-65-4200

A ll rig h ts re s e rv e d .
FIRST EDITIO N : M AY 2001
Printed in Japan

PUB. No. SM E-13010-A

( M AYA ) CN-24

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 CONTENTS

1. GENERAL ......................................................................................................... 1-1

1.1 POWER SUPPLY ...................................................................................... 1-1
1.2 UPWARD AND DOWNWARD SOUNDING ............................................. 1-1
1.2.1 Sounding Rate ................................................................................ 1-1
1.3 DATA FORMAT FROM TRANSMITTER UNIT .......................................... 1-2
1.3.1 SYNC Code .................................................................................... 1-3
1.3.2 Temperature Data ............................................................................ 1-3
1.3.3 Upward/Downward Sounding .......................................................... 1-4
1.3.4 Depth Data ...................................................................................... 1-4

2. CIRCUIT DESCRIPTION ................................................................................ 2-1

2.1 TRANSMITTER UNIT .............................................................................. 2-1
2.1.1 Board Function ................................................................................ 2-1
2.1.2 Power ON/OFF Control ................................................................... 2-1
2.1.3 Upward and Downward Soundings .................................................. 2-1
2.1.4 Depth/Temperature Measurement (SEN Board) .............................. 2-5
2.1.5 Signal Transmission (CONT-A, CONT-B Boards) ............................. 2-7
2.2 DISPLAY UNIT ........................................................................................ 2-10
2.2.1 Power Supply (POW 01P5727) ....................................................... 2-10
2.2.2 Receiver Board (AMP 01P5725) ..................................................... 2-12
2.2.3 Display and Signal Processor Board (DISP 01P5726) ..................... 2-12

3. CHECK AND ADJUSTMENT .......................................................................... 3-1

3.1 DISPLAY UNIT CHECK ...................................................................... 3-1
3.1.1 Self-Check ................................................................................ 3-1
3.1.2 Power Supply Circuit (POW Board 01P5737) ................................ 3-2
3.2 TESTING FUNCTION IN AIR .............................................................. 3-2
3.2.1 Testing Transmitter Unit and Display Unit with Receiving Transducer. 3-2
3.2.2 Testing in Air without Paravane Receiver ........................................ 3-3
3.3 ADJUSTING TRANSMITTER UNIT....................................................... 3-4
3.3.1 Gain Adjustment .......................................................................... 3-4
3.3.2 Depth Indication Adjustment ......................................................... 3-4
3.3.3 Adjusting Transmission Frequency on CONT.B Board...................... 3-5
3.4 ADJUSTMENT OF DISPLAY UNIT ....................................................... 3-7
3.4.1 Color Monitor Adjustment ............................................................. 3-7
3.4.2 DISP Board (01P5726)................................................................. 3-8

4. CHANGE OF SPECIFICATIONS ..................................................................... 4-1

4.1 DISPLAY UNIT .................................................................................. 4-1
4.1.1 Range Unit, Sounding Range, Data Format, etc ............................ 4-1
4.2 TRANSMITTER UNIT ........................................................................ 4-3
4.2.1 Sounding Range .......................................................................... 4-3
4.2.2 Sounding Rate ........................................................................... 4-4
4.2.3 Signal Transmitting Power ........................................................... 4-4
4.2.4 Adjustment Mode......................................................................... 4-5
5. PARTS LOCATION ............................................................................................ 5-1
5.1 DISPLAY UNIT .................................................................................... 5-1
5.2 TRANSMITTER UNIT (CN-2220) .......................................................... 5-6

6. BOARD INTERCHANGEABILITY ..................................................................... 6-1

6.1 DISPLAY UNIT .................................................................................... 6-1
6.2 TRANSMITTER UNIT .......................................................................... 6-2

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 7. CALIBRATION OF PRESSURE SENSOR ........................................................ 7-1

8. DISASSEMBLING/ASSEMBLING TRANSMITTER UNIT ................................. 8-1

SPECIFICATIONS................................................................................................. SPC-1

EXPLODED VIEW................................................................................................. D-1

MECHANICAL PARTS LIST.................................................................................. M-1

ELECTRICAL PARTS LIST....................................................................................... E-1

SCHEMATIC DIAGRAM........................................................................................ S-1

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 1. GENERAL
This chapter describes the basic operations of the transmitter unit. Most of operations are
CPU controlled.

1.1 POWER SUPPLY

The transmitter unit is automatically powered by the pressure switch when it descends 10
m in the sea and turned off when it ascends to 5m deep point.

1.2 UPWARD AND DOWNWARD SOUNDING

The transmitter unit incorporates only one sounding transmitter/receiver circuit. The upward
and downward transducers are alternately connected to the circuit by the action of a relay.

1.2.1 Sounding Rate

Two kinds of sounding rates are used to improve coverage area.

Standard Rate ("LOW" setting)

Downward
Sounding

Upward
Sounding

The time "T" between the pulses depends on the sounding range setting in the
transmitter unit.

Fig. 1.1 Upward and Downward Sounding in Standard Mode

High Rate ("HIGH" setting)

In this rate, sounding is performed three times within one cycle of transmitter operation with
standard rate.

Downward
Sounding

Upward
Sounding

Fig. 1.2 Upward and Downward Soundings at High Rate

1-1

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 The receiver receives signals within the range in use at the first sounding, and it receives
signals between 0 and 20 meters at the second and third soundings in both upward and
downward directions. Generally, the blind zone occurs in short range due to the beam
shape and rare transmission rate. The high transmission rate can reduce the blind zone
and increase the number of reflection from the target.
Refer to the figure below.

Detects target one time Detects target three times

Fig. 1.3 Sounding Area (Standard versus High)

The received signals obtained by these three soundings are processed as follows in the
transmitter unit.
a) 0 - 20m:The received echoes obtained from the three soundings are compared and
the strongest echo is picked up and sent to the display unit.
b) more than 20m: The received echoes obtained from the first sounding are sent to the
display unit.

1.3 DATA FORMAT FROM TRANSMITTER UNIT

The data sent from the transmitter unit to the paravane receiver consist of upward and
downward sounding signals, sync code, temperature and depth data, and catch sensor
data (option). Transmission sequence of these signals are shown in Fig. 1.4.

Fig. 1.4 Data Format

There are two SYNC codes, DN SYNC and UP SYNC, and (2) depth data is divided into
two parts, MSB and LSB.

1-2

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 1.3.1 SYNC Code
The synchronous signal consists of 32bits binary coded data.
The DN SYNC code is attached to the beginning of each transmission cycle to enable the
display unit identifying the signal. The coded pulses enable to reduce the effect of noise
along the transmission line to the paravane receiver.
n
The S/N ratio becomes maximum when the number of bits is 2 -1 (n: integer), 31 bits out
of these 32 bits are actually used in the display unit. Fig. 1.5 shows the 32 bits code data.

Fig. 1.5 SYNC Code (DN SYNC)

The UP SYNC signal inserted before the catch monitor data consists of 15 bit binary code
data and is used to stabilize the oscillation line of the upward sounding picture on the
display unit.
For the modulation of the sync codes, the FS (Frequency Shift) modulation is employed; "1',
and "0" are modulated at frequencies which are different by 1kHz each other, as shown
bellow.

Code/Frequency
Transmission Frequency 0 1
33 kHz 33 kHz 34 kHz
40 kHz 40 kHz 41 kHz
50 kHz 50 kHz 51 kHz

1.3.2 Temperature Data

The water temperature is indicated by the time interval from the left edge of the
temperature data region to the temperature signal (15 bit H/L code). The temperature data
region is allocated next to the DN SYNC code.
Depending on the temperature, the time from the left edge varies.

Temperature signal (15 bit H/L code)

Fig. 1.6 Temperature data region

1-3

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 Note: In actual processing, the temperature data expressed by 9 bit binary number is
divided into two parts, the lower 5 bits and the upper 4 bits, and the temperature data
region is also divided into two sections. The time interval from the left edge of each section
to temperature signal indicate the value of the lower 5 bit or upper 4 bit number. This
configuration enables to shorten the length of the temperature data region.

Fig. 1.7 Temperature data region

1.3.3 Upward/Downward Sounding

The received echo signals are transmitted to the paravane receiver with
frequency-modulated form.
The echo signals received by the upward/downward sounding circuit are converted into 4
bits binary data which represent 15 stages signal level and then converted into FM signal
by the V-F converter.

1.3.4 Depth Data

Like the water temperature measurement, the detected depth is indicated by the time from
the left edge of the depth signal area to the depth signal (15 bit H/L code). However, to
shorten the length of the depth signal area, the depth data is divided into two parts (upper
6 bits and lower 6 bits) and inserted into the pause areas of downward and upward
sounding periods. See Fig. 1.8.

1-4

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1-5
Fig. 1.8 Transmitter unit timing chart (range: 80/80 m and sounding rate: high)
 2. CIRCUIT DESCRIPTION
2.1 TRANSMITTER UNIT
2.1.1 Board Function

Refer to the block diagram shown in figure 2.1. The transmitter unit consists of five PC
boards. The table below shows the major functions of each PC board.

Board Major Functions

TRS. A 01 P5742 1) Generates upward/downward sounding TX signals.
2) IF amplifier, mixer, and detector of received signals.
3) TVG control of received signals.
4) A/D conversion of received signals.
TRS. B 01 P5743 1) Power amplification of upward/downward sounding TX signals.
2) RF amplification of received signals.
SEN 01 P5744 1) Depth/water temperature measurement.
CO NT. A 1) Control of transmitter, receiver and signal transmitter circuits by
01P5740 CPU.
2) Acquisition and processing of A/D converted received signals.
3) Power amplification of signal transmitted to paravane receiver.

CONT. B 01P5741 1) D/A conversion and frequency modulation of signals transmitted

toward paravane receiver.
2) A/D conversion of depth and water temperature signals for
acquisition by CPU.
3) Presetting of transmitter unit operation mode.

2.1.2 Power ON/OFF Control

When the transmitter unit reach at 10 m deep in the water, the pressure switch is turned on
and activates the + 5 and 15 V regulator on the CONT A board. And the transmitter unit
starts functioning automatically. When the transmitter unit rises above 10 m, the pressure
switch is turned off, and the transmitter unit stops functioning.

2.1.3 Upward and Downward Soundings

Transmitter Circuit
The transmitter circuit for upward and downward soundings are incorporated on TRS.
A and TRS. B boards. For the 75 kHz transmission, the 1.2 MHz signal generated by the
CPU on the CONT A board is frequency-divided by 16 to 75kHz and 1.4 MHz generated by
a crystal oscillator on the TRS.A board is divided by 8 to 175 kHz.
These 75 kHz or 175 kHz clock signals are applied to the succeeding gate circuit, where it
is gated by 0.2ms long TSMT pulse from the CPU, and then sent to the power amplifier.
The power amplifier amplifies the transmission signals to 100W and sent to the sounding
transducer via the output transformer and the T/R circuit. The T/R circuit links the
transducer to the transmitter circuit during transmission and to the RF amplifier during
reception. Relay K1 selects the transducer for upward or downward sounding and is
controlled by the CPU via the UP/DN CONT circuit.
Figure 2.2 and 2.3 show the transmitting waveform and TSMT signal.

2-1

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 Fig. 2.1 Block Diagram of Transmitter Unit

2-2

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 2V/DIV
100V/DIV
0.5ms/DIV
0.2ms/DIV

Measuring point: P4 #1 - P4 #4 Measuring point: TP6 on TRS.A board

Frequency:75 kHz Frequency:75 kHz

Fig. 2.2 TX waveform Fig.2.3 TX trigger: TSMT

Receiver Circuit

The received signal from the transducer is first amplified by the RF amplifier and then
mixed with the local oscillator output to get a 455 kHz IF signal. The IF signal (Fig.2.4 CH1)
is amplified and fed to the next stage's full wave detector. The output of the detector (Fig.
2.4 CH2) is A/D converted to eight bit echo data at specific sampling intervals.
The AMP PWR CONT circuit supplies + 5 V (AMP5V), which is controlled by APWR signal
from the CPU, to the TVG amplifier only during the reception period to conserve battery
consumption.

CH1
200mV/Div CH1
1ms/Div 200mV/Div
CH2 1us/Div
CH1 2V/Div
1ms/Div

CH2

Measuring point: CH1 -- TP3 Measuring point: TP7 (carrier)

CH2 ---TP2(ESIG)

Fig.2.4 Waveforms of received echo signal Fig.2.5 Waveform of carrier signal

TVG Circuit

Triggered by the TVG (Time Varied Gain) signal from the CPU on the CONT A board, the
TVG circuit generates an exponentially rising TVG voltage (TVG curve). This voltage
controls the gain of the amplifier in such a way that the gain is minimum at the time of
transmission and gradually increases with time. The TVG curve is factory set to a 30 log
curve suitable for fish detection.
Fig.2.6 shows the waveforms of the TVG voltage.

2-3

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 CH1
CH1
500mV/DIV
2V/DIV
2ms/DIV
100ms/DIV
CH2
CH1 2V/DIV
2ms/DIV

CH2

0V
Measuring point
Measuring point: TP5 (VG) CH1: TP5 (VG)
Sounding rate: High CH2: TP6

(A) (B)

Fig. 2.6 waveforms of TVG voltage

Fig. 2.7 TVG curve

The STC (Sensitivity Time Control) curve is also generated in the TVG circuit. It suppresses
the echoes just below the oscillation line, making the oscillation line thin so as not to cover
the fish echoes close to the head rope.

2-4

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 2.1.4 Depth/Temperature Measurement (SEN Board)
Depth Measurement

Refer to the simplified depth measurement circuit shown in figure 2.8.

Fig. 2.8 Simplified Depth Measurement Circuit

1) The pressure sensor for depth measurement constitutes a Wheatstone Bridge.

It balances at 0 m and the voltage difference between "+" and " - " becomes zero.
(In fact there is 0.6 mV approximately, so R10 adjusts the off-set voltage to obtain 0 V.)

2) When the sensor (S1 and S2) detects water pressure, the resistance of one sensor
increases and that of the other decreases, developing a voltage proportional to the
depth across "+" and "-" terminals.

3) The voltage detected by the sensor device is once amplified at U1 (1/2) and (2/2), then
led to differential amplifier U2 (1/2). The output of U2 (1/2) detected as DEP-1 at TP3 is 1
to 9 V which corresponds to the depth of 0 - 2000m. U1 (1/2) and (2/2) are an amplifier of
high input impedance and employed to increase measuring accuracy.

4) The succeeding differential amplifier U2 (2/2) works to enhance the measuring

resolution as much as five times. Namely the output at TP4 (DEP-2) varies from 1 to
9 V five times while DEP-1 at TP3 varies from 1 to 9V.
This is controlled by the CPU; the CPU monitors TP3 (DEP-1) voltage and changes
the reference voltage of U2 (2/2) at depths corresponding to every 400m (400m,
80cm...160Cm). Refer to Figs. 2.9 for the operation.

2-5

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 Fig. 2.9 Conversion Curve; depth vs. voltage

IMPORTANT

The pressure sensor is a non-linear device and the characteristic varies from device
to device. As the calibration data for the sensor in use are stored in the EEROM (U5
on SEN board), the sensor and SEN board should be used as a pair, that is, both the
sensor and SEN board should be replaced if either of them is defective.

Temperature Measurement

The thermistor, which has characteristics shown in Fig. 2.10, is used as the sensor device.
The variation of resistance caused by variation of temperature is converted to variation of
voltage (shown in Fig. 2.11) by the TEMP AMP circuit and fed to the CPU through the A/D
converter on the CONT B board.

Fig. 2.10 Characteristics of the thermistor

2-6

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 Fig. 2.11 Temperature Data (TP8)

2.1.5 Signal Transmission (CONT-A, CONT-B Boards)

Refer to the block diagram on page 2-2.

• Echo, Depth and Temperature Data Reading by CPU

The eight bit echo data (256 step slices) from the TRS. A board are once applied to the
dual-port RAM and finally transferred to the CPU. When writing the echo data into CPU, the
sampling interval is controlled depending on the distance from the transmitter unit as
shown in Table 2.1. In shorter ranges the data are picked up at shorter intervals to improve
resolution. For example, in case of 320m range, the total sampling data are;
l l
0----------5----------10----------20----------40---------------------------320 m range
512 + 256 + 256 + 256 3840 x 280/600 = 3072

Table 2.1
Range Sampling Interval Total Echo Data
0-5m 1 cm 512
5 - 10 m 2 cm 256
10 - 20 m 4 cm 256
20 - 40 m 8 cm 256
40 - 640 m 16 cm 3840

The echo data read by CPU is compressed logarithmically from 8 bits to 4 bits and stored
in scratch pad RAM U2 until they are read out for signal transmission. This logarithmic
conversion enhances the low-level signals so that they may be less affected by noise
during transmission toward the paravane receiver. If, for example, the noise level in the
propagation path is as in Fig. 2.12, the signals within "b" are affected by noise in the linear
conversion while those only within "a" are affected in the logarithmic conversion.

2-7

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 The low level signal Transmission can be improved against the noise.
*16 bits = 15 bits for signal + 1 bit for frequency calibration data

Fig. 2.12

Depth and temperature data from the SEN board are read by the CPU through the AD
converter on the CONT B board and then stored in the scratch pad RAM U2.

• Signal Transmission
The temperature, upward and downward sounding and depth signals stored in the RAM
are read out one after another according to the transmission format shown in Fig. 2.13.
Those are D/A converted, frequency-modulated on the CONT B board and transmitted to
the paravane receiver. Synchronous signals ("DOWN SYNC" and "UP SYNC") are made by
software, stored in the ROM and read out at each transmitting timing.

Fig. 2.13

The timers on the CONT A board operate as a frequency counter. It counts the Voltage to
Frequency (V/F) converter output during the temperature data period and adjusts the
signal level if V/P converter characteristic deviates from the rated range.

2-8

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 The echo data from the CPU consists of 8 bits (4 bits for echo data and 4 bits for frequency
calibration data). The CPU determines the calibration value from timer's output count and
writes it on the designated frequency calibration data bits to obtain 50kHz (33kHz, 40kHz)
in no-modulation (no signal) state and 51kHz (34kHz, 41kHz) in maximum modulation
state at TP1 and TP2.

Echo Data Frequency

Calibration Data

Fig. 2.14

The TON (Transmitter ON) is a gate signal which functions to cut the carrier signal for non
signal period when transmitting the temperature, depth and catch monitor data. This control
helps to conserve battery consumption. However, in the transmission period of upward and
downward sounding data, the carrier signal is emitted even when there is no echo signal.
Refer to Fig.1.8 TX unit timing chart.

• Power Amplifier
The output applied to the frequency divider is frequency-calibrated and FM-modulated
signals. The frequency divider divides the frequency by 8 to produce the actual transmitting
frequency of 33, 40 or 50kHz. A gate circuit is incorporated in the output of the frequency
divider to provide the dead time to prevent the two power transistors from conducting
simultaneously. The output of the frequency divider is sent to the power amplifier and
applied to the transducer. The output power is 10W or 2.4W as determined by tap
connections of the output transformer.

2-9

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 2.2 DISPLAY UNIT
The display unit consists of the following sections as shown in the block diagram on the
next page.

(1) Power Supply (01 P5737)

(2) Amplifier Board (01P5725)
(3) Display and Signal Processing Board (01P5726)
(4) Panel Board (01P5729)
(5) Color Monitor (TM-140F2 or CDKC-14CE151)

2.2.1 Power Supply (POW 01P5727)

The power supply circuit is made up of a PWM (Pulse Width Modulation). Inverter
employing switching regulator techniques like other Furuno-made echo sounders and
radars. The PWM inverter universally operates on ship's mains of 10 - 40 VDC. Against the
vibration of the load condition, it regulates the DC output line by changing the width of its
output pulse. The power supply circuit provides +12 V, -12 V, +5V, and 130 V for the color
monitor.

Each line is connected to the respective circuit as shown in Fig. 2.15.

Fig. 2.15 Power Supply for Display Unit

2-10

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 Fig. 2.16 Block Diagram of Display Unit

2-11

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 2.2.2 Receiver Board (AMP 01P5725)

On this board the FM and FS signals received through the receiving transducer is
frequency-converted to be applied to the succeeding DISP board.

The received signals are sent to the first mixer where the frequency of the signals are
converted to 455kHz IF frequency. The output of the first mixer is amplified and applied to
the second mixer and IF amplifier. The output signal is 9.5+0.5 kHz (2nd IF frequency).
Amplifier gain and selection of the first local oscillators are controlled by the DISP board.

2.2.3 Display and Signal Processor Board (DISP 01P5726)

The DISP board incorporates two microcomputers, SUB and MAIN for enhanced
processing speed. The SUB computer is a single chip MCU (Micro Computer Unit) which
has a built-in ROM and RAM. Its major function is detecting the SYNC codes from the echo
signal and sending them to the MAIN CPU. The MAIN CPU incorporates a built-in 256 byte
RAM but no ROM. It uses an external ROM. The main functions are arithmetic processing
of the temperature and depth data, the reading of operator's commands from the panel
keys and writing the processed data into the video RAM via the gate array. It also acquires
ship's speed data by communicating with external navigational equipment in the Furuno
CIF format and generates the clock signal for the SUB MCU (SYNC code detector). The
video RAM has three picture pages and one scale/character page. This enables instant
switchover to the picture page selected by the presentation mode.

• Echo Data Acquisition

The FM echo signal (9.0 - 10.0 kHz) from the AMP board 01P5725 is led to the
CPU-controlled low-pass filter U19 via selector U11. The selector selects the external
(playback) signal if the picture recorder MT-12 is connected. Then, it is applied to the
succeeding AM and FM detector circuits after being amplified by the buffer amplifier.
The AM detector functions to detect received signal strength. The FM detector
demodulates the received FM signal.
Signal acquisition is performed by the combination work of the MAIN and SUB CPUs. First
the SUB CPU detects the Down SYNC code from the received signal then the acquisition
starts. The acquired data is directly transferred to the MAIN CPU's RAM (DMA transfer;
Direct Memory Access) and interference rejection is executed if the "Noise Limiter" is
turned on through the menu. Then the data is transferred to the video display RAM
according to the presentation mode and the control of the gate array. See the signal
acquisition sequence on the next page.

2-12

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 1 Down SYNC code detection command
2 Detection report
3 Temperature data acquisition command
4 Acquisition report
5 Down sounding data acquisition command
6 Acquisition report
7 Depth data(MSB) acquisition command
8 Acquisition report
9 Up SYNC code detection command
10 Detection report
11 Catch monitor data acquisition command
12 Acquisition report
13 Up sounding data acquisition command
14 Acquisition report
15 Depth data(LSB) acquisition command
16 Acquisition report

Fig. 2.17 Data Acquisition Sequence by CPUs

Reading Panel Setting Status

The operator's commands input through the control panel are all sent to the keyboard
interface chip U59 via U66. It also collects the frequency data from the AMP board and
setting of DIP switch. These status and data are acknowledged by the MAIN CPU to be
processed following the operator's settings. Namely the operator selects the presentation
mode of upward and downward combinations; for example, the MAIN CPU generates and
sends the control command to the gate array to display the designated mode.

2-13

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 3. CHECK AND ADJUSTMENT
3.1 DISPLAY UNIT CHECK
As the CN-24 color net recorder is properly adjusted at the factory, no adjustment is
required in the field. This also applies to the PC boards supplied as maintenance parts.
Do the following adjustments when malfunctioning is found or the equipment is overhauled.

3.1.1 Self-Check

The self-check screen provides the information to check the following;

a) Panel switch contact
b) Function check (KP pulse, CIF line)
c) Device check (BEROM, SRAM, DRAM)

Procedure
1. Turn on the POWER for a few seconds, while pressing [ - ] key of TM RANGE.
Self-check screen appears. The EVENT key functions to select a self-check; panel
switch check and device/function check.
2. Check the functions in accordance with the figure 3.1.
3. To exit from the self-check mode, turn off the power.

PANEL SWITCH CHECK

To check keys for proper operation, press each

key one by one while observing the screen. If
the key is functioning properly, "0" is replaced
by 1" when the key is pressed.
"ON" : 1. "OFF" : 0
Rotary switch -? contact number

DEVICE/FUNCTION CHECK

Pressing the VENT key moves the asterisk (*)

to the item "MAIN CPU" and starts checking
each device in the order displayed on the screen.
In the DRAM check, the entire screen is
alternately painted in reddish brown and white
four times each. If everything is normal, "OK"
appears. If something is wrong, nothing appears.

NOTE: PORT results

OK
1: defective CIF line
2: defective MT.12 line
3: Both CIF and MT.12 lines defective

To perform PORT check, connect dummy

connector to J3. "1" is displayed without
connection.

Indication of internal settings (S1 S2).

See pages 4-1 and 4-2.

Fig. 3.1 Self-Check

3-1

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 3.1.2 Power Supply Circuit (POW Board 01P5737)

Line Voltage Check

Voltage Rated Value Measuring Point

01P5726, DISP 01P5737
+5V 4.85 to 5.15 V J12 #5 TP6
+12V 11.65t to 12.35 V J12 #1 TP4
-12V -12.6 to -11.4 V J12 #4 TP5
+15 V TP2
-15 V TP3
+130V (TV) - TP1
GND TP7 and TP8 TP7

Notes: 1) Confirm that each line voltage is within the rated value under the condition of
maximum brilliance.
2) +130V line can be adjusted by R28.
3) Be careful not to short circuit +130V to ground while power is applied.
4) The current consumption of Display Unit is 1.7 to 2.3A.

Frequency Adjustment
Test Point Adjusted by Rated Value Instruments
TP10 - TP8 R50 69.05 to 70.05kHz Frequency Counter

3.2 TESTING FUNCTION IN AIR

3.2.1 Testing Transmitter Unit and Display Unit with Receiving Transducer.

Procedure
1. Arrange all units as shown below.

Fig.3.2
3-2

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 NOTE:
1) Stop the transmission within 5 minutes to prevent damage of transducer
2)The unit of 10 W TX output can not be checked in air The test can be done by one of
two ways.
• Reduce the output power down to 2.4Wand follow the procedures on page 4-4.
• Place the TX unit in the water tank or bucket and check the operation. If signal
transmitting transducer is working, you can hear the TX sound and sense the
pressure on the transducer surface by hand. The display check can not be done
with this method.

2. Rotate the screw of the pressure switch (test switch) clockwise with a screwdriver to turn
on the transmitter unit.

3. Placing your finger on the radiating face, you can feel pulses if the transmission is made
normally.

4. Turn on the display unit.

If all units (transmitter, receiver + cable and display unit) are operating satisfactory, some
echoes are displayed on the screen. Note that the depth of echoes is four times greater
than their actual depth since sound velocity in air is a quarter of the one in water.

5. If the operation check results are satisfactory, turn the test switch fully counterclockwise.

3.2.2 Test in Air without Paravane Receiver

Make the test cable and place the loop on the signal transmitting transducer as show in
figure 7.3. The signal from the transducer can be picked up through the loop by the
electromagnetic induction.

Fig. 3.3 Testing function in Air without Paravane Receiver

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 3.3 ADJUSTING TRANSMITTER UNIT
3.3.1 Gain Adjustment

The transmitter unit incorporates the preset potentiometers shown in the table. All
potentiometers except for R17 (gain adjustment) on the TRS. A board are for factory
adjustment. For R17, though it has been properly adjusted, readjust it when clear picture is
not obtained. Note that too high gain setting will cause excessive noise.

Figure 3.4 Gain adjustment

Function of adjusters in the transmitter unit

PCB Pot. Used for

CONT.B R5 Frequency deviation adjustment of FM modulation.
01P5741 R25 Frequency adjustment of FM modulation.
TRS.A R17 Gain adjustment of receiver circuit.
01P5742 R35 Maximum gain adjustment of receiver circuit.
R38 STC (Sensitivity Time Control) curve adjustment.
SEN R10 Offset adjustment of depth measurement circuit.
01P5744 R11 Gain adjustment of depth measurement circuit.
R12 Calibration of water temperature measurement circuit.

3.3.2 Depth Indication Adjustment

A oil pressurize instrument is required to adjust the depth indication.

Without the oil pressurize instrument, compensate the depth error by the "Net Depth"
setting in menu screen and offset adjuster R10 on the SEN board.

Following shows the procedure to adjust the offset value "0 m" on the SEN board(01P5744).

1. Connect the test cable or receiving transducer as shown in figure 5.1 and 5.2.
2. Pull out the PC board assembly by the extension cable.
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 3. Operate the transceiver unit in air
4. Adjust the R10 on the SEN board as follows;
1) When depth indication is "0m", turn the R10 on the SEN board to CW slowly so that
the depth indication becomes 1m. Then turn the R10 slowly to CCW by a point where
the depth indication starts to change from 1m to 0m.
2) When depth indication is not 0m, turn the R10 to CCW slowly by a point where the
depth indication starts to change to 0m.

Note: Do not adjust R11 on the SEN board without the oil pressurize instrument.

3.3.3 Adjusting Transmission Frequency on the CONT.B Board

When change the transmission frequency or the CONT.B board (01P5741). The V/F
conversion circuit on the CONT.B board must be adjusted for each transmission frequency.
(When only the CONT.B board is delivered, it is adjusted for the frequency 50kHz.)
Necessary Instrument
1. Oscilloscope
2. Signal generator
3. Frequency counter

Caution
Improper settings of the DIP switch may destroy the data of EVRAM on the SEN board.
Do not set the DIP switches S1 and S2 as follows, while adjusting the PC board.

S1 #1 #2 #3 #4 #5 #6 #7 #8 S2 #1 #2 #3 #4
OFF OFF ON ON X X X OFF OFF OFF OFF OFF

When the S1 and S2 are set to above, the loading mode for NVRAM starts, and then all
calibration data stored in factory may be canceled. In this case readjustment by using the oil
Pressurize instrument is required.

Adjustment
1. Connect PC board assembly to the transmitter unit, using extension cable.
2. Record the present setting of the DIP switches S1 and S2 on the CONT.B board.
3. Set the DIP switch S1 as shown below;

Transmission S1
frequency #1 #2 #3 #4 #5 #6 #7 #8
50 kHz OFF ON ON ON ON OFF ON ON
40 kHz OFF ON ON ON ON ON OFF ON
33 kHz OFF ON ON ON ON OFF OFF ON
4. Connect the frequency counter to TP1(VFO) on the CONT.B board
5. Set all bits of the DIP switch S2 to OFF.
6. Turn on the transmitter unit by rotating the test screw of the pressure switch.
7. Adjust R25 on the CONT.B board so that the frequency obtained at the TP1 becomes as
follows,

Transmission frequency Frequency at TP1

50 kHz 400 kHz
40 kHz 320 kHz
33 kHz 264 kHz

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 8. Connect a probe CH1 of the oscilloscope to TP2 on the CONT.A board and the CH2 to
the signal output of the signal generator.
9. Set the output frequency of the signal generator as shown bellow;

Transmission frequency Signal generator

50 kHz 50 kHz
40 kHz 40 kHz
33 kHz 33 kHz

10. Select X-Y mode on the Oscilloscope in order to display the "Lissajous figure".
11. Adjust the R25 so that the "Lissajous figure" obtained on the oscilloscope becomes
stable.

Waveform before adjustment adjusting Adjusted properly

Figure 3.5 Lissajous figure

11.Set the DIP switch S2 #4 to ON.

12.Turn the test switch off.

13. Set the DIP switch S1 as shown below;

Transmission S1
frequency #1 #2 #3 #4 #5 #6 #7 #8
50 kHz OFF OFF ON ON ON OFF ON ON
40 kHz OFF OFF ON ON ON ON OFF ON
33 kHz OFF OFF ON ON ON OFF OFF ON

14. Set the DIP switch S2 #4 to OFF( all bits of S1: OFF).
15. Turn on the test switch
16. Adjust R5 on the CONT.B board so that the frequency obtained at the TP1 becomes as
follows,

Transmission frequency Frequency at TP1

50 kHz 408 kHz
40 kHz 328 kHz
33 kHz 272 kHz

Note; the frequency obtained at TP1 may be unstable, since it is modulated.

17. Set the output frequency of the signal generator as shown bellow;

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 Transmission frequency Signal generator
50 kHz 51 kHz
40 kHz 41 kHz
33 kHz 34 kHz

18. Adjust the R5 so that the "Lissajous figure" obtained on the oscilloscope becomes
stable, as shown in figure 3.3.
19. Set the DIP switch S2 #4 to ON.
20. Turn the pressure switch OFF
21. Set all other bits of DIP switches S1 and S2 to the original settings recorded in step 2.

3.4 ADJUSTMENT OF DISPLAY UNIT

3.4.1 Color Monitor Adjustment

Focus/brilliance
Call the self-check page by turning on the POWER while pressing [ - ] key of the TM
RANGE.

1. Set the BRILLIANCE control at maximum.

2. Set the FOCUS pot. for the sharpest picture.

SCREEN

FOCUS
Fig.3.6 Display Unit Rear View

Adjusters on the CE MAIN board of the Monitor Unit

H. PHASE V. HOLD S. PIN V. LIN V. SIZE V. CENT H. HOLD

Fig.3.7 Adjusters on the CE MAIN board

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 3.4.2 DISP Board (01P5726)

Set the BRILLIANCE control at max. position, and the DEEP BLUE background is clearly
distinguished from the blank area surrounding it. Set R64 (H-POSITION) so that the upper
and lower blank areas become equal in width.

Set R65 (BLUE) to the center position. Adjust R66 (RED) so that the reddish brown can be
identified under the BRILLIANCE setting of "4" to "6" position.

NOTE: Do not adjust the potentiometers on the CE VIDEO board connected to the CRT
neck.

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 4. CHANGE OF SPECIFICATIONS
4.1 DISPLAY UNIT
4.1.1 Range Unit, Sounding Range, Data Format, etc.

Procedures

1) Turn off the power by pressing the PWR and OFF keys simultaneously.
2) Remove the display cover by loosening the fixing screws.
3) Change the settings of DIP switches S1, S2 and S3 on the DISP board 01P5726
referring to the figure/table below.

Fig 4.1 Locations of the dip-switches S1, S2, and S3

[S1 SETTINGS] - - For Display

No. ITEMS SETTING/CONTENTS

1 Range Unit RANGE UNIT ON M OFF FT ON FA OFF P/B
2 ON ON OFF OFF
3 Data Format NAVS ON CIF OFF NMEA *2
4 Memory back Up BACK UP ON On OFF Off
5 Menu Language CHR ON English OFF Japanese
6 MT-12 Operation *1 PLAY ON TAPE OFF PANEL
o
7 Temperature TEMP ON C OFF oF
8 Operating Mode MODE ON Normal OFF Test

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 * 1. This setting enables/disables the gain/clutter controls when playing back picture
from picture recorder MT-12.

"ON": Gain/clutter controls are disabled. The recorded picture is played back as it is.
"OFF": Gain/clutter controls are enabled. The recorded picture can be gain/clutter
controlled.
*2. No NMEA input/output data.

[S2 SETTINGS] - - For Synchronizing with Transmitter Unit

No ITEMS SETTING/CONTENTS
1 Not used
2
3 Pressure sensor Max XMTR ON 2000 m OFF 1000 ON 500
4 Depth TYPE OFF ON m ON m
5 Downward Sounding DN ON 80 m OFF 160m ON 320 OFF 640 m
6 Range RANGE ON ON OFF m OFF
7 Upward Sounding UP ON 80m OFF 160m ON 320 OFF 640 m
8 Range RANGE ON ON OFF m OFF

Note:
1. The upward/downward range settings on the display unit and the transmitter unit must
be identical.
2. The maximum depth setting of the CN-2220 must be 2000m, since the pressure
sensor in the transmitter unit is adjusted to 2000m in the maximum depth.

[S3 SETTINGS] - - For Synch Code detection (Threshold)

No ITEMS SETTING/CONTENTS
1 Downward Synch Code (31 OFF Allowance "5" Do not change settings locally.
2 bit) ON
3 OFF
4 Temperature/depth/Upward ON Allowance "2"
5 Synch Code (16 bit) OFF
6 ON
7 Not used
8

NOTE: Hatched areas are factory settings.

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 4.2 TRANSMITTER UNIT
4.2.1 Sounding Range

The sounding range is set with DIP switch S1 on the CONT-B 01P5741 board. The switch
is factory-set to 80m for both the upward and downward ranges. To change the factory
setting, refer to the figure below.

Fig. 4.2 S1, S2 Location

S1, S2 DIP SWITCH SETTING in Normal Operation Mode

Note: The sounding range determinates the maximum range for echo reception.
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 4.2.2 Sounding Rate

The sounding rate is set with S2 (#1) DIP switch on the CONT-B 01P5741 board. The
switch is factory-set to "HIGH" (190 times/min).

When "LOW" is selected, the rate is down to 1/3 approximately. See table below.

The relation between sounding rates and Upward/Downward ranges is shown below.

RANGE 80/ 160/ 160/ 320/ 320/ 320/ 640/ 640/ 640/ 640/
(Up/Down) 80 80 160 80 160 320 80 160 320 640
Sounding Rate LOW 63 59 55 51 48 43 37 36 33 27
HIGH 190 177 165 154 145 130 113 108 99 81

4.2.3 Signal Transmitting Power

The signal transmitting power can be changed from 2.4W to 10 W or vice versa by
changing the jumper connections (Jxx1 and Jxx2) on the CONT-A Board (01P5740).

Note: Increasing output power decreases the battery operating hour by 50%
approximately.

The factory setting of the Output Power is 2.4 W

TX Freq. Jumper Settings Output Power

Jxx1 Jxx2 Jxx3
33kHz A-LA B-LB 2 2.4W
A-HA B-HB 10 W
40kHz A-LA B-LB 2 2.4W
A-HA B-HB 10 W
50kHz A-LA B-LB 1 2.4W
A-HA B-HB 10 W

The jumper Jxx3 must be set according to the frequency.

Fig. 4.3 Location of Jumper Blocks

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 4.2.4 Adjustment Mode

The DIP switches S1 and S2 are used when depth and transmission frequency
adjustments are required.
The adjustment mode starts automatically when the DIP switch S2 #4 is set to OFF.
Following table shows the function of each settings of the S1 and S2.

0: OFF, 1: ON
S1 S2 Functions
1 2 3 4 5 6 7 8 1 2 3 4 5
0 0 0 0 x x x 0 0 0 0 0 0 Adjusts offset (0 m) of depth scale
1 0 0 0 x x x 0 0 0 0 0 0 Adjusts full scale (2000m) of depth scale
0 1 0 0 x x x 0 0 0 0 0 0 Stores offset data of 1/5 section into RAM temporally
1 1 0 0 x x x 0 0 0 0 0 0 Stores full-scale data of 1/5 section into RAM temporally
0 0 1 0 x x x 0 0 0 0 0 0 Stores offset data of 2/5 section into RAM temporally
1 0 1 0 x x x 0 0 0 0 0 0 Stores full-scale data of 2/5 section into RAM temporally
0 1 1 0 x x x 0 0 0 0 0 0 Stores offset data of 3/5 section into RAM temporally
1 1 1 0 x x x 0 0 0 0 0 0 Stores full-scale data of 3/5 section into RAM temporally
0 0 0 1 x x x 0 0 0 0 0 0 Stores offset data of 4/5 section into RAM temporally
1 0 0 1 x x x 0 0 0 0 0 0 Stores full-scale data of 4/5 section into RAM temporally
0 1 0 1 x x x 0 0 0 0 0 0 Stores offset data of 5/5 section into RAM temporally
1 1 0 1 x x x 0 0 0 0 0 0 Stores full-scale data of 5/5 section into RAM temporally
0 0 1 1 x x x 0 0 0 0 0 0 Loads all data of RAM onto NVRAM

0 0 1 x x x 1 0 0 0 0 0 Temperature adjustment mode selection

1 0 1 x x x 1 0 0 0 0 0
0 1 1 A B C 1 0 0 0 0 0 Transmission frequency adjustment mode selection "GAIN"
1 1 1 A B C 1 0 0 0 0 0 Transmission frequency adjustment mode selection
"Offset"

X: any position.
A, B, C: sets according to transmission frequency.

Caution
Do not activate the adjustment mode, if any adjustments are not nessesary.

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 5. PARTS LOCATION

5.1 DISPLAY UNIT

I/F Board
01P5750 MIF Board
06P0136

DISP Board
01P5726
AMP Board
01P5725 (under
case)

Fig. 5.1 Display Unit side view

PNL Board
01P5729

Fig. 5.2 Display Unit rear side view

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 POW Board
01P5737

FAN

Degauss Board
CE-DEGAU

Deflection Board
CE-MAIN
CRT

Video Board
CE-VIDEO

Fig.5.3 Display Unit; top view

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 DISP Board (01P5726)
CR13: SYNC
TP11 TP2 CR12: HALT
Jxx3

TP8
TP1

Jxx1
Jxx2
U16 R48: ES SIG

R64: H-POS
R65: BLUE
R66: RED
TP3
TP4
TP10 TP5
TP6
TP7
S3

S2

TP12 S1

TP9

Fig. 5.4 DISP board

Adjusters Names Functions

R48 ES SIG Adjusts signal output voltage for external unit
R64 H-POS Adjusts vertical position of display, see chapter 3
R65 BLUE Adjusts blue signal voltage, see chapter 3
R66 RED Adjusts red signal voltage, see chapter 3

LEDs Names Functions

CR12 HALT Always off
CR13 SYNC Blinks when sync.code is detected

Jumpers Functions
Jxx1 Set the signal transmitting power, see chapter 4.
Jxx2
Jxx3

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 Test Points Remarks
TP1 SIG Signal input from AMP board
TP2 AM OUT Signal output from AM detector circuit
TP3 COP. SYNC. Composite synchronous signal for monitor circuit
TP4 BLUE Signal output "Blue"
TP5 GREEN Signal output "Green"
TP6 RED Signal output "Red"
TP7 GND OV
TP8 GND
TP9 GND
TP10 GND
TP11 Input of digital filter "U19"
TP12 100K

Dip-Switches Functions
S1 See chapter 4
S2
S3

AMP Board (01P5725)

Y1

Y2 Y4
Y3 Y5

JP2

TP3

R8

JP1

TP2 TP5
TP1 TP4

Fig. 5.5 AMP board

Adjuster Name Adjusting

R8 Preset gain Adjust total gain of AMP circuit to 91 dB

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 Test Points Names Functions
TP1 SIG Signal output of AMP circuit, maximum voltage;11 Vpp and 9 to 10 kHz
nd
TP2 2 Local 464.5 kHz
st
TP3 1 Local 505.5 kHz for 50 kHz, 488.5 kHz for 33 kHz, 495.5 kHz for 40 kHz
TP4 Analogue GND
TP5 IF output

Jumpers Remarks
Jxx1 See chapter 7
Jxx2

POW Board (01P5737)

Q1 Q2 Q3 Q4 Q5 Q6 CR12

TP10

TP1

R28
K1
TP2
TP3

TP4 TP5 TP8 TP7

R50 TP8 TP9
Q7
Fig. 5.6 POW board

Test Points Names

TP1 130 V
TP2 +15 V
TP3 -15 V
TP4 +12 V
TP5 -12 V
TP6 5V
TP7 0V
TP8 - Negative line of Ship's Main
TP9 Vcc
TP10

Adjusters Names
R28 +90 v ADJ
R50 FREQ ADJ

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 5.2 TRANSMITTER UNIT (CN-2220)
Upward Transducer

Link Transducer

Pressure Switch

Downward Transducer Pressure Sensor

Test Switch (Screw) Temperature Sensor

Serial Number
of pressure sensor

Gain Adjuster
PC board Assembly

Fig 5.7 Transmitter Unit

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 CONT. B CONT. A
01P5741 01P5740

TXSD.B
01P5739

SEN Board
TRS B
01P5744
01P5743

TRS A
01P5742

Fig 5.8 Transmitter unit; PC board assembly

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 SEN Board (01P5744)

U5: NVRAM
TP1

TP2 R10 R11

R12 TP3
TP4

Fig.5.9 SEN Board (01P5744)

Test points Names Remarks

TP1 CAC Catch sensor signal
TP2 TEMP Temperature signal output; 1 to 9 voltages.
TP3 DEP1 Amplified output voltage of pressure sensor
TP4 DEP2 Magnified voltage of DEP1; 1 to 9 voltages.

Adjusters Names Remarkes

R10 OFF SET Offset adjuster of depth measurement circuit
R11 GAIN Gain adjuster of depth measurement circuit
R12 TEMP Adjusts inclination of temperature sensor data

TRS A (01P5742)
JP4
TP6 JP1 JP3
TP3
JP2

JP5

R17

TP2

R35 R38 TP1 TP4 TP7

TP5

Fig 5.10 TRS.A board; 01P5742

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 Test points Names Remarks
TP1 GND
TP2 ESIG Echo signal (DC) inputted to A/D converter
TP3 SIG (AC) Echo signal (AC)
TP4 GND
TP5 VG TVG voltage
TP6 TSMT Transmission trigger pulse
TP7 CARRIER Carrier signal for mixer circuit; 530 kHz for 75 kHz, 630 kHz for 175 kHz

Adjusters Names Remarks

R17 GAIN Adjusts gain of IF amplifier
R35 MAX-G Adjusts maximum gain
R38 STC Adjust gain at short distance; 0 to 2 m

Jumpers Remarks
JP1 Selects either signals 1.2 MHz or 1.4 MHz; 1.2 MHz for 75 kHz and 1.4 MHz for 175 kHz
1.2 MHz: Connects "CC" to "CA"
1.4 MHz: Connects "CC" to "CB"
JP2 Selects outputs of divider in accordance with transmission frequency
JP3 JP2 JP3 JP4
JP4 75 kHz DA - DB EA - EB FA - FB
175 kHz EA - DB FA - EB GA - FB
JP5 Selects carrier signals in accordance with transmission frequency
75 kHz: put resister R44 between "AA" and "AA"
175 kHz: put resister R44 between "BB" and "BB"

TRS B (01P5743)

K1

Fig.5.11 TRS.B board; 01P5743

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 CONT A (01P5740)

Jxx3

TP2
Jxx1

TP3
Jxx2

TP7
TP1

Fig 5.12 CONT. A board (01P5740)

Test Points Names Remarks

TP1 OWP
TP2 TX1 Signal transmission output +
TP3 TX2 Signal transmission output - (GND)
TP7 GND

Jumpers Remarks
Jxx1 Sets output voltage
Jxx2 2.4 W 10 W
Jxx1 A - LA A - HB
Jxx2 B - LA B - HB
Jxx3 Sets according to the link frequency
50 kHz: 1 , 40 kHz: 2 , 33 kHz: 2

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 CONT B (01P5741)

S1 S2

TP1

R25

R5 TP2

Fig 5.13 CONT. B board (01P5741)

Dip-switches Remarks
S1 See chapter 4
S2

Adjusters Names Remarks

R5 Gain See chapter 3
R25 Off-set

Test points Names Remarks

TP1 VFO Output of VCO circuit; 8 times the signal transmission frequency
TP2 VFIN Output of D/A converter; clock signal

TXSD B (01P5739)

Jumper;
Put jumper for CN-2220
(Put resister 10 k ohm for
model CN21)

Fig 5.14 TXSD. B board (01P5739)

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 6. BOARD INTERCHANGEABILITY
6.1 DISPLAY UNIT
All boards except the AMP board 01P5725 in the display unit are common PC board for all
frequency units.

The AMP board 01P5725 is fitted with a crystal oscillator for the designated signal
transmission frequency (33, 40 or 50kHz) only.
The frequency can be changed by adding a crystal oscillator and changing jumper settings.

Necessary parts

Frequency Type of Crystal Code No.

33kHz NTO-762BA 4885kHz 000-11 8-959
40kHz NTO-762BA 4955kHz 000-118-960
50kHz NTO-762BA 5055kHz 000-118-961

Procedures

1. #7 and #8 pin holes for crystal oscillator on the board are shorted by a jumper wire
when crystal oscillators are not installed. Remove the jumper to install the crystal
oscillator for the desired frequency.

2. Change the settings of jumper block Jxx1 and jumper wire as follows.

Frequency Jumper Block Jxx1 Jumper Wire

33 kHz FL FL-F4
40 kHz FM FM-F2
50 kHz FH FH-F6

Fig.6.1 Jumper settings

Note: All jumper wires (FL-F4, FM-F2, FH-F6) are set previously in the factory
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 6.2 TRANSMITTER UNIT
1. SEN board 01P5744

The SEN board has a PROM(NVRAM) which stores the characteristics of the pressure
sensor. Since the characteristics differ from sensor to sensor, it is not allowed to change
either the SEN board or the pressure sensor only. Both should be replaced in pair.

Note: When the SEN board and pressure sensor are replaced, "0 m adjustment" is
required. Refer to chapter 3.

2. CONTA. board 01P5740

The CONT A board can be used for all three signal transmission frequencies (33kHz,
40kHz, 50kHz) if jumper Jxx3 setting is changed. See page 4-4.

3. CONT. B board 01P5741

The adjustment of potentiometers R5 and R25 and the settings of the dip-switch S1 differ
with the frequency. See page 3-5/4-3.

4. TRS. A board 01P5742 and TRS. B board 01P5743

The TRS. A and TRS. B boards differ with the sounding frequency, i.e., 75 kHz or 175 kHz.

5. TXSD. B board 01P5739

The TXSD. B board can be used for all three signal transmission frequencies.
Note: a jumper setting on the PC board must be put for the CN-24. See page 5-11 and
circuit diagram.

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 7. CALIBRATION OF PRESSURE SENSOR
The calibration of the pressure sensor is required when either the pressure censor or the
SEN board is replaced.

Caution
1) The pressure sensor and SEN board should be replaced as a pair when either of
them is defective, because of the calibration data for each sensor is stored in the
NVRAM (U5 on the SEN board). The serial numbers marked on the transceiver case
and the PC board assembly must be identical.

2) To recalibrate the depth indication by adjusting a characteristic value of the

2
pressure sensor, the accurate oil pressure device (maximum pressure; 206 kgf/cm )
is required, do not try to adjust without the pressurize instrument.

3) When the DIP switch S2 #4 is set to OFF, the PC board assembly is entered into
adjustment mode (depth sensor, frequency adjustment etc) automatically. DIP switch
setting should not be changed carelessly in the adjustment mode. Otherwise, the
sensor calibration data stored in NVRAM is destroyed and re-adjustment is required.

4) Since the calibration date corresponding to the given pressure are stored into the
EEROM at every 2 sec after setting the DIP switch, set the DIP switch settings after
the given pressure becomes stable.

5) The calibration data is stored into a RAM on the CONT.A board (01P5740)
temporally before the final loading into the NVRAM on the SEN board.
All calibration data stored into the RAM are cleared off if once the power is tuned off
under the adjustment mode (#4: OFF).
Do not turn off before storing the data into NVRAM.

6) Once the DIP switch is set to improper position , a wrong data is stored into RAM.
In this case, restart the adjustment from the first step.

Following shows the adjustment procedure using the oil pressurize instrument.

! Necessary instrument
1. Oil pressurize instrument
2. Adapter to link a oil pressure to the pressure sensor
3. Multimeter
4. Extension cable
5. LED indicator (2.7 k ohm resistor and LED)

! Preparation

1) Connect the PC board assembly to the transmitter by the extension cable.

2) Record the present DIP switch settings of S1 and S2 on CONT.B board.
3) Connect Multimeter to TP4 on the SEN board so as to obtain the voltage (DC).

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 4) Connect LED indicator to J13 on the TRS.A board as follows.

TRS. A
01P5742 J13
1
LED

2.7 k
5

Figure 7.1 LED indicator circuit

5) Connect receiving transducer or test cable to the display unit and the TX transducer,
see pages 5-2/5-3, in order to obtain the depth data on the display.

6) Connect the oil pressure device to pressure sensor of the transceiver unit.

! Adjustment

Turn on the transmitter unit by rotating the screw of the pressure switch (test switch) to
clockwise(1.5 turn).

1. Offset and full scale adjustment

1) Set DIP switches S1 and S2 on the CONT B board as follows

S1 #1 #2 #3 #4 #5 #6 #7 #8
off off off off X X X off

S2 #1 #2 #3 #4
off off off ON

DIP switch settings of "X" is as follows

TX frequency #5 #6 #7
50 KHz on off on
40 KHz on on off
33 KHz on off off

2) Release pressuring (0 kgf/ cm2 )

3) Adjust the R10 on sensor board so that the depth indication on the display unit shows
0m.

4) Set the oil device to 206 kgf/cm2

5) Adjust the R11 so that the depth indication on display unit shows 500m.

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 2. Sensor curve adjustment

Set DIP switches S1 and S2 as follow( S2 #4: OFF)

S1 #1 #2 #3 #4 #5 #6 #7 #8
off off off off X X X off

S2 #1 #2 #3 #4
off off off OFF

"Temporal storing the "0" data of 1/5 curve"

2
1) Set the oil pressurize device to 0 kgf/ cm

2) Set DIP switches S1 and S2 as follow (S1 #2: ON)

S1 #1 #2 #3 #4 #5 #6 #7 #8
OFF ON OFF OFF X X X off

S2 #1 #2 #3 #4
off off off off

3) Confirm that the LED lights up from blinking.

"Temporal storing the full scale data of 1/5 curve"

2
4) Set the oil pressurize device to 41. 2 kgf/ cm and keep it by a step 8.

5) Set DIP switches S1 and S2 as follow (S1 #1: ON)

S1 #1 #2 #3 #4 #5 #6 #7 #8
ON ON OFF OFF X X X off

S2 #1 #2 #3 #4
off off off off

6) Confirm that the LED lights up from blinking.

"Temporal storing the "0" data of 2/5 curve"

7) Confirm that the pressure is 41. 2 kgf/cm2.

8) Set DIP switches S1 and S2 as follow (S1 #1:OFF, #2:OFF, #3:ON

S1 #1 #2 #3 #4 #5 #6 #7 #8
OFF OFF ON OFF X X X off
S2 #1 #2 #3 #4
off off off off

8) Confirm that a voltage at TP4 changes from 9 to 1 volts

"Temporal storing the full scale data of 2/5 curve"

7-3

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 2
9) Set the oil pressurize device to 82.4 kgf/ cm , and keep it by the step 13.

10) Set DIP switches S1 and S2 as follow

S1 #1 #2 #3 #4 #5 #6 #7 #8
on off on off X X X off

S2 #1 #2 #3 #4
off off off off

11) Confirm that the LED lights up from blinking.

"Temporal storing the "0" data of 3/5 curve"

2
12) Confirm that the pressure is 82.4 kgf/ cm .

13) Set the DIP switches S1 and S2 as follow;

S1 #1 #2 #3 #4 #5 #6 #7 #8
off o n on off X X X off

S2 #1 #2 #3 #4
off off off off

13) Confirm that voltage at TP4 changes is from 9 to 1 volts

"Temporal storing the full scale data of 3/5 curve"

2
14) Set the oil device to 123.6 kgf/ cm , and keep it by the step 17.

15) Set DIP switches S1 and S2 as follow;

Si #1 #2 #3 #4 #5 #6 #7 #8
on on on off X X X off

S2 #1 #2 #3 #4
off off off off

16) Confirm that the LED lights up from blinking.

"Temporal storing the "0" data of 4/5 curve"

17) Confirm that the pressure is 123.6 kgf/ cm2.

Set the DIP switches S1 and S2 as follow;

S1 #1 #2 #3 #4 #5 #6 #7 #8
off off off on X X X off

S2 #1 #2 #3 #4
off off off off

7-4

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 17) Confirm that the voltage at TP4 changes from 9 to 1 volts

"Temporal storing the full scale data of 4/5 curve"

18) Set the oil pressur to 164 8 kgf/ cm2, and keep it by a step 22.

19) Set DIP switches S1 and S2 as follow

S1 #1 #2 #3 #4 #5 #6 #7 #8
on off off on X X X off

S2 #1 #2 #3 #4
off off off off

20) Confirm that the LED lights up from blinking.

"Temporal storing the "0" data of 5/5 curve"

2
21) Confirm that the oil pressure is 164.8 kgf/ cm .

22) Set the DIP switches S1 and S2 as follow;

S1 #1 #2 #3 #4 #5 #6 #7 #8
off on off on X X X off

S2 #1 #2 #3 #4
off off off off

22) Confirm that the voltage at TP4 changes from 9 to 1 volt.

"Temporal storing the full scale data of 5/5 curve"

2
23) Set the oil pressure to 206 kgf/ cm , and keep it by a step 25.

24) Set the DIP switches 51 and S2 as follow

S1 #1 #2 #3 #4 #5 #6 #7 #8
on on off on X X X off

S2 #1 #2 #3 #4
off off off off

25) Confirm that the LED lights up from blinking.

"Storing all data (1/5 to 5/5) into NVRAM"

26) Set DIP switches S1 and S2 as follow

S1 #1 #2 #3 #4 #5 #6 #7 #8
off off on on X X X off

7-5

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 S2 #1 #2 #3 #4
off off off off

27) Confirm that the LED lights up from blinking.

Caution
The calibration data stored into NVRAM at a moment when the DIP switches are set to
above. If the DIP switches are set to above before completing the adjustment.
Improper calibration data are stored into NVRAM, which produce erratic depth indication.

28) Turn off the transmitter unit by rotating the screw of pressure switch to CCW..
2
29) Set the oil device to 0 kgf/ cm .

30) Set DIP switches S1 and S2 as follow

S1 #1 #2 #3 #4 #5 #6 #7 #8
off off off off X X X off

S2 #1 #2 #3 #4
off off off "on" (Normal mode)

Caution
If turn on the power again before setting the DIP switch to above ( S2 #4: ON), All data of
NVRAM may broken.

3. Confirmation of result of adjustment

1) Turn on the transmitter unit by rotating the screw of the pressure switch (test switch) to
clockwise
2) Set the oil pressure to 0 kgf/ cm2.

3) Confirm that the depth indication on the display is within 0 to 1 m.

4) Set the oil pressure to 82 4 kgf/ cm2.

5) Confirm if the depth indication is within 790 to 810 m.

6) Set the oil pressure to 206 kgf/ cm2.

7) Confirm if the depth indication is within 1990 to 2000 m.

8) Set the oil pressure to 0 kgf/ cm2. Set the DIP switches S1 and S2 to original setting.

7-6

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 8. DISASSEMBLING/ASSEMBLING
TRANSMITTER UNIT
1. How to fix or remove the Battery case and End Cover.

Fig.8.1 Battery case and End cover

8-1

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 2. How to fix and remove the PC board assembly.

Fig. 8.2 PC board assembly

3. How to fix and remove the Link Transducer

Fig.8.3 Link Transducer

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 4. How to fix and remove the guide plate and wires from the plug P1.

P1

Fig.8.4 Guide plate and Plug P1

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 5. How to fix and remove the transducer.

Fig. 8.5 Upward and downward transducers

When removing the transducer from housing , follow to the procedure shown in
figure 8.6.
Prepare the tool shown in figure 8.6 and carefully rotate little by little.
Too much rotating may twist off the wire connected to the transducer.

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 Caution: do not pry the transducer with driver.

Fig. 8.6 Removing transducer

7. How to fix and remove the Pressure Switch.

Fig. 8.7 Pressure Switch

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 8. How to fix and remove the Pressure Sensor and temperature Sensor.

Fig. 8.9 Pressure Sensor and Temperature Sensor

8-6

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 SPECIFICATIONS OF COLOR NET
RECORDER CN-24
DISPLAY UNIT CN-2410

1. Display

14" diagonal, rectangular CRT.

Echo ; presented in 7 color graduations (with selectable background color)
Temperature ; presented in graphical form and digital value.

2. Presentation Mode

(1) Downward mode

(2) Upward + downward mode
(3) True Motion (upward + downward) mode
Each mode incorporates Normal and Historical picture advancement modes.

3. Basic Display Range

Range 1 2 3 4
Downward Meters 10 20 30 40
/Upward Fathoms
Feet
Passi
Brazars
True Meters 20 40 80 160
Motion Fathoms
Feet
Passi
Brazars

NOTES 1) Display start depth can be shifted in 1 m(fa, ft, p/b) steps in true motion mode.
2) Basic display ranges are reprogram-able on the menu.
3) Unit is selectable by internal DIP switch.

4. Range Shift

(Available on True Motion mode only)

Manual ; 0-2000 m, 0-1080 fa, 0-6560 ft, 0-1200 P/B
Auto ; The net trace shifts to the center of the screen when it comes to 1/4 or 314 of
the screen from the top.

5. Display Advancement

Normal Mode ; OFF (Freeze), 1/8, 1/6, 114, 1/2 1/1 (Scan line/transmission)
Historical Mode ; 5/10/15/30/60/90/120(minutes/screen)
Six hours of observation is available in Downward mode.

6. Net Depth Indication 0 - 2000m

SPC-1

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 7. Temperature Indication

Digital Readout; -50C - +400C in O.10C step, (200F - 1000F in O.20F step)
Graph ; plotted in the interval of +50C(+100F). When the temperature rises above
or falls below the limits of the scale, the graph is shifted to the center of
the scale.

8. Marker & Digital Readout

Marker ; Minute marker, VRM marker

Readout ; Net depth, temperature

(L/L data & time is displayed when connected with nay, system.)

9. Input/output Data*(CIF or NMEA Format)

Input ; Ship's position (L/L), ship's speed, ship's bearing, time

Output ; Net depth, temperature (CIF only)

* Optional EIS interface kit is required.

10. Output for external display/recorder unit

1) Echo Signal (upward/downward)

2) Net depth (Synchronous signal "KP" is necessary to input.)

Optional E/S interface kit (OPO1-5) is required. Echo Signal can be connected to the
color video sounder/recorder which have monitor channel.

11. Picture Record/Playback

Picture Recorder MT-12 (Optional MT-12 interface kit is required when connecting with
MT-12.)

12. Power Supply and Consumption

10-40 VDC, less than 100 W

100/110/115/200/230 VAC, 50-60 Hz, 1•
(optional rectifier RU-3423 is required.)

PARAVANE RECEIVER ND-85XX

1. Frequency and Beamwidth

Frequency Beamwidth
33 kHz 34 degrees (-3dB)
40 kHz 30 degrees (-3dB)
50 kHz 28 degrees (-3dB)

2. Transducer Tilt Angle Adjustable to 15o, 25o or 35o below horizontal

SPC-2

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 3. Maximum Pressure 5kg/cm2 (equivalent to 50m)

4. Cable length & Strength 70m, tensile strength: more than 1000 kgf

5. Towing Speed Normal reception up to 6 knots

TRANSMITTER UNIT CN-2220

1. Signal Transmission Characteristics and Operating Hour of Battery Pack

Frequency Output Beam width Battery Operating hour TX Range*

o
33 kHz 2.4 W 34 (-3 dB) 20 hours (LR-20) 3800 m max.
40 kHz 32o (-3 dB) 10 hours (BP-2) 3000 m max.
o
50 kHz 28 (-3 dB) 2200 m max.

Frequency Output Beam width Battery Operating hour TX Range*

o
33 kHz 2.4 W 34 (-3 dB) 9 hours (LR-20) 4500 m max.
o
40 kHz 32 (-3 dB) 5 hours (BP-2) 3600 m max.
o
50 kHz 28 (-3 dB) 2800 m max.
* affected by sea condition and others

2. Signal Transmission Mode

Sync pulse : Frequency shift code modulation

Echo : Frequency modulation
Depth/Water Temp : Pulse position modulation

3. Sounding Characteristics

Frequency Output Beam width Minimum range Max Detection Range

o
75 kHz 100 W 33 (-3 dB) 1.5 m 640 m

4. Sounding Rates and Sounding Range

Sounding Rate Sounding Range

Low 28-68 times/mm. 0 - 640 m
High 83-206 times/mm.

5. Pulse length 0.6 ms

6. Temperature Measurement -50C to +400C or 200F to 1000F (Accuracy *0.5%)

7. Maximum Depth & Ambient Temperature

2000 m, -100C - +400C

8. Power Supply

12VDC, Alkaline-manganese dry cell LR-20 8 pcs. Or Ni-Cd batterypack BP-2 (option)
Automatically switched on at 10 m deep point.

SPC-3

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