SERVICE MANUAL

MODEL:LAC-M3600/LAC-M3600R
DETACHABLE FRONT
PANEL CAR CD RECEIVER
SERVICE MANUAL
CAUTION
BEFORE SERVICING THE UNIT, READ THE “SAFETY PRECAUTIONS”
IN THIS MANUAL.

MODEL:LAC-M3600/LAC-M3600R
 [CONTENTS]
❍ SECTION 1.GENERAL
• SERVICING PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
• ESD PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
• SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-4

❍ SECTION 2. ELECTRICAL
• ELECTRICAL TROUBLESHOOTING GUIDE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
• WAVEFORMS OF MAJOR CHECK POINT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6
• INTERNAL BLOCK DIAGRAM of ICs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7
• BLOCK DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-17
• SCHEMATIC DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-19
• PRINTED CIRCUIT DIARGAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-27

❍ SECTION 3. EXPLODED VIEWS

• CABINET AND MAIN FRAME SECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
• MECHANISM (PICK-UP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3

❍ SECTION 4. REPLACEMENT PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . .4-1

- 1-1 -
 SECTION 1. SUMMARY
❏ SERVICING PRECAUTIONS
❶ Always disconnect the power source before:
1) Removing or reinstalling any component, circuit board, module or any other instrument assembly.
2) Disconnecting or reconnecting any instrument electrical plug or other electrical connection.
3) Connecting a test substitute in parallel with an electrolytic capacitor in the instrument.

CAUTION: A wrong part substitution or incorrect polarity installation of electrolytic capacitors may result in
an explosion hazard.

❷ Do not defeat any plug/socket B+ voltage interlocks with which instruments covered by
this service manual might be equipped.

❹ Do not apply power to this instrument and or any of its electrical assemblies unless all
solid-state device heat sinks are correctly installed.

❸ Always connect a test instrument’s ground lead to the instrument chassis ground before
connecting the test instrument positive lead. Always remove the test instrument ground
lead last.
1) The service precautions are indicated or printed on the cabinet, chassis or components. When servicing,
follow the printed or indicated service precautions and service materials.
2) The Components used in the unit have a specified conflammability and dielectric strength. When replac-
ing any components, use components which have the same ratings. Components marked in the cir-
cuit diagram are important for safety or for the characteristics of the unit. Always replace with the exact
components.
3) An insulation tube or tape is sometimes used and some components are raised above the printed writing
board for safety. The internal wiring is sometimes clamped to prevent contact with heating components.
Install them as they were.
4) After servicing always check that the removed screws, components and wiring have been installed cor-
rectly and that the portion around the service part has not been damaged. Further check the insulation
between the blades of attachment plug and accessible conductive parts.

- 1-2 -
❏ ESD PRECAUTIONS
Electrostatically Sensitive Devices (ESD)
Some semiconductor (solid state) devices can be damaged easily by static electricity. Such components
commonly are called Electrostatically Sensitive Devices (ESD). Examples of typical ESD devices are integrated
circuits and some field-effect transistors and semiconductor chip components. The following techniques should
be used to help reduce the incidence of component damage caused by static electricity.
1. Immediately before handling any semiconductor component or semiconductor-equipped assembly, drain off
any electrostatic charge on your body by touching a known earth ground. Alternatively, obtain and wear a
commercially available discharging wrist strap device, which should be removed for potential shock reasons
prior to applying power to the unit under test.
2. After removing an electrical assembly equipped with ESD devices, place the assembly on a conductive sur-
face such as aluminum foil, to prevent electrostatic charge buildup or exposure of the assembly.
3. Use only a grounded-tip soldering iron to solder or unsolder ESD devices.
4. Use only an anti-static solder removal device. Some solder removal devices not classified as "anti-static" can
generate electrical charges sufficient to damage ESD devices.
5. Do not use freon-propelled chemicals. These can generate electrical charges sufficient to damage ESD
devices.
6. Do not remove a replacement ESD device from its protective package until immediately before you are
ready to install it. (Most replacement ESD devices are packaged with leads electrically shorted together by
conductive foam, aluminum foil or comparable conductive materials).
7. Immediately before removing the protective material from the leads of a replacement ESD device, touch the
protective material to the chassis or circuit assembly into which the device will by installed.

CAUTION : BE SURE NO POWER IS APPLIED TO THE CHASSIS OR CIRCUIT, AND OBSERVE ALL
OTHER SAFETY PRECAUTIONS.

8. Minimize bodily motions when handing unpackaged replacement ESD devices. (Otherwise harmless motion
such as the brushing together of your clothes fabric or the lifting of your foot from a carpeted floor can gen-
erate static electricity sufficient to damage an ESD device).

CAUTION. GRAPHIC SYMBOLS

THE LIGHTNING FLASH WITH APROWHEAD SYMBOL. WITHIN AN EQUILATERAL TRIANGLE,
IS INTENDED TO ALERT THE SERVICE PERSONNEL TO THE PRESENCE OF UNINSULATED
“DANGEROUS VOLTAGE” THAT MAY BE OF SUFFICIENT MAGNITUDE TO CONSTITUTE A
RISK OF ELECTRIC SHOCK.

THE EXCLAMATION POINT WITHIN AN EQUILATERAL TRIANGLE IS INTENDED TO ALERT

THE SERVICE PERSONNEL TO THE PRESENCE OF IMPORTANT SAFETY INFORMATION IN
SERVICE LITERATURE.

- 1-3 -
❏ SPECIFICATIONS
1. GENERAL
Power requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . DC12V~15V
Ground system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Negative
Dimensions(W x H x D) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 188 x 58 x 166mm
Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Net: 1.3kg

2. RADIO SECTION
FM AM(MW)
Frequency range 65.0~74.0MHz(Optional), 522~1,620kHz
87.5~108MHz (Optional:530~1,710kHz/ 520~1,620kHz)
Intermediate frequency 10.8MHz 450kHz
Usable sensitivity 10dBµV 28dBµV
Signal to noise ratio 55dB 45dB

3. COMPACT DISC SECTION

Frequency response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40Hz~20kHz
Channel separation (Line out) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90dB (1kHz)
Signal to noise ratio (Line out) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110dB

4. AUDIO SECTION
Maximum output power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50W x 4
Speaker impedance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4Ω x 4 or 8Ω x 4

NOTE: The design and specifications are subject to change without notice in the sourse of product
improvement.

- 1-4 -
 SECTION 2. ELECTRICAL
❏ ELECTRICAL TROUBLESHOOTING GUIDE
1. No Power.

Any Key power on.

YES

NO Check power supply circuitry.

Is power turnd on? Q930, Q924, Q919,
Q920, Q921, IC902, pin1

YES

NO Check loading supply circuitry.

DISC loading? Q9001, Q902, Q903, Q904, PN503,
IC507, IC506, IC508

YES

NO
Does initial reading occur? Check laser circuitry.
Q541, IC501

Check focusing circuitry.

YES
Q541, IC501

Check DISC.

NO Check tracking servo circuitry.

Can disc be played? Q541, IC501, IC503

YES

NO
Is audio output supplied? Check audio circuitry.
IC501,IC509, CN503

YES

OK

- 2-1 -
2. LCD light abnornal.

Any Key power on.

(without DISC)

NO Check voltage in the power NO Power supply circuitry defective.

Do display LCD then light? supply Q371,Q372,IC403

YES

NO • Reset circuit defective.

Is u-com IC906 LCD reset
circuit normal?Pin74 IC901 Surrounding circuit
defective.

YES

Is u-com IC906 X1,X2 terminal

NO X101,X102,C101,
Pin11,12,14,15 input?
OSC :19.2MHz C102,C103,C104.
OSC :32.768kHz

YES

Is u-com IC906 keyin NO Q921,ZD910

Pin19,20 5volt input? PCB pattern defective.

YES

NO IC906,Pin74,75,76
Is u-com IC906 Pin 74,75,76
output waveform normal? front PCB pattern defective.

YES

NO
Is IC901 Com1, Com2, Com3 IC901,Surrounding circuit
output waveform normal? PCB pattern defective.

YES

Display LCD connector

defective.

- 2-2 -
3. Initial reading is not carried out.
Slide motor moves NO Check the Voltage change of NO Defective
(With disc) CN503 Pin12 (6.4~6.8V) connector CN503
YES
Check the Voltage IC501 NO
YES Defective IC501
Pin23 (1.4V~1.8V)
YES
NO Spindle motor turns
WAVEFORM #1 Check the Data transmission Defective connector
NO
from CN503 (16, 17, 18) to CD CN503 Defective
DSP WAVEFORM #5 MICOM
YES (with disc)
YES
Does RF waveform
appear? IC501 Pin49 Check the Data transmission Defective
WAVEFORM #2 from CN503 Pin21 to MICOM NO connector CN503
WAVEFORM #5 Defective IC503

YES

Check the TRVP

NO
Voltage Defective IC501
IC501 Pin23

YES

Check the change of

NO
SL +, SL - Voltage Defective IC503
IC503 Pin13,14

YES
Defective contact CN501
Defective PICK-UP
Laser light check A ?
YES

Does FA+ waveform appear at

NO
IC501 Pin23?
WAVEFORM #3
focus coil drive wareform.
YES

Does TE waveform appear at

IC501 Pin24? NO
WAVEFORM #4
TRACKING ERROR wareform
YES

Is rotation normal?
NO

YES

Is there no dropout of RF signal?

YES Defective IC501
Defective PICK-UP

- 2-3 -
 A When laser does not light.

Is “2.4V~3.4V” applied to
pin42 of IC501?
( OV ➀ 3.4V ➁ 2.4V)

NO

NO NO
Did pickup return to Is data transferred from Defective MICOM or CN503.
innermost circular? MICOM IC ?

YES YES

Does voltage appear at NO

IC503 Pin 13, 14? Defective IC501.

YES Defective slide motor and/or

connector. (CN502)

Is defect output from LMT

Does it stop at inner pick
SW applied to Pin7 of
circular after shift?
YES PN503? NO Defective LMT SW and/or
connector. (CN502,CN503)
OPEN CLOSE

YES YES Defective MICOM.

NO
Is power supplied to laser Q541? Defective IC501
(Q541 collector: about 1.8V)

- 2-4 -
B When laser light.

Laser lights

YES

NO
Check the signal FOCUS Defective IC501
SEARCH of IC501 Pin25
WAVEFORM #3

YES

Check the signal of IC503

Pin 15, 16 NO
Defective IC501
WAVEFORM #3

YES
Degraded laser diode
Defective PICK-UP

C When SPINDLE motor dose not turn

Check the change for

SPDO Voltage of NO
IC501 Pin21 Defective IC501
WAVEFORM #1

Check the change for

SP +, SP -, Voltage of NO
IC503 Pin11, 12 Defective IC503
WAVEFORM #1

YES
Defective contact CN501
or Defective PICK-UP

- 2-5 -
❏ WAVEFORMS OF MAJOR CHECK POINT
#1. SPINDLE DRIVE AND MOTOR WAVEFORM #2. RF WAVEFORM
IC501(21), IC504(12) during TOC reading IC501(45), IC501(49) during TOC reading

#3. FOCUS DRIVE AND MOTOR WAVEFORM

IC501(25), IC503(15)
• When focus search failed or there is no disc on tray • There is disc on tray and focus search success

#4. TRACK DRIVE AND MOTOR WAVEFORM

IC504(24), IC503(17) during TOC reading

- 2-6 -
❏ INTERNAL BLOCK DIAGRAM of ICs

■ AV_CAR
1) Micom Port Assignment

- 2-7 -
2) Pin Descriptions

- 2-8 -
- 2-9 -
■ BD3805F
1) BLOCK DIAGRAM

- 2-10 -
■ MN6627933CN(DSP)
1) Connection Diagram

- 2-11 -
■ TA8275HQ
1) Block Diagram

- 2-12 -
■ upd78f0546(Micom)
1) Block Diagram

- 2-13 -
2) Pin lay out

- 2-14 -
3) Pin Function

PIN NAME Function

VDD Positive power supply except for ports ( except P20-P27 and P121-P124) and AD converter
VSS Ground potential except for ports (except P20-P27 and P121-P124) and AD converter
EVDD Positive power supply for ports (expect p20-p27 and p121-p124)
EVSS Ground potential for ports (except p20-p27 and p121-p124)
RESET System reset input
FLMDO Flash EEPROM programming mode setting
REGC Connecting regulator stabillzation capacitor. Connect to GND via a capacitor (0.47µF).
AVREF A/D converter analog power supply and power supply for p20-p27
AVSS Ground potential for A/D convert and p20-p27
P00/T1000 I/O port
External count clock input to 16-bit timer/event counter 00
Capture trigger input to capture reglsters (CR000, CR010) of 16-bit timer/event counter 00(TM00)
P01/TI010/TO00 I/O port
Capture trigger input to capture register (CR000) of 16-bit timer/event counter 00 (TM00)
16-bit timer/event counter 00 outout (TM00)
P02/SO11 I/O port
Serial data output from serial interface (CSI11)
PO3/SI11 I/O port
Serial data input to serial interface (CSI11)
P20/SCK11 I/O port
Clock input/output for serial interface (CSI11)
P05/TI001/SSI11 I/O port
External count clock input to 18-bit timer/event counter 01
Capture trigger input to capture reglsters (CR001, CR011) of 16-bit timer/event counter 01( TM01)
Chip input/output for serial interface (CSI11)
P06/TI011/TO01 I/O port
Capture trigger input to capture register (CR001) of 160bit timer/evrnt counter 01 (TM01)
16-bit timer/evrnt counter 01 output (TM01)
P10/SCK10/TXD0 I/O port
Clock input/output for serial interface (CSI10)
Serial data output from asynchronous serial interface (UART0)
P11/SI10/RXD0 I/O port
Serial data input to serial interface (CSI10)
Serial data input to asynchronous serial interface (UART0)
P12/SO10 I/O port
Serial data input to serial interface (CSI10)
P13/TXD6 I/O port
Serial data output from asynchronous serial interface (UART6)
P14.RXD6 I/O port
Serial data input to asynchronous serial interface (UART6)
P15/TOH0 I/O port
8-bit timer H0 output (TMH0)
P16/TOH1/NTP5 I/O port
8-bit timer H1 output (TMH1)
External interrupt request input with specifiable valia edges
P17/TI50/TO50 I/O port
External count clock input to 8-bit timer/event counter 50 (TM50)
8-bit timer/event counter 50 output (TM50)
P20-P27/ANI0-ANI7 I/O ports
A/D converter analog input
P30/INTP1 I/O port
P31/INTP2 External interrupt request input with specifiable vaild edges
P31/INTP2
P33 I/O port
/TI51 External count clock input to 8-bit time/event counter 51 (TM51)
/TO51 8-bit timer/event counter 51 output (TM51)
/INTP4 External interrupt request input with specifiable valid edges
P40-P47 I/O port
P50-P57 I/O port
P60/SCL0 I/O port (N-ch open drain)
Clock input/output for serial interface (IIC0)
P61/SDA0 I/O port (N-ch open drain)
Serial data input/output for serial interface (IIC0)

- 2-15 -
PIN NAME Function
P62/EXSCL0 I/O port (N-ch open drain)
External clock input for serial interface (IIC0)
P63 I/O port (N-ch open drain)
P64-P67 I/O ports
P70-P77 I/O ports
/KR0-KR7 Key interrupt input
P120 I/O port
/INTP0 External interrupt request input with specifiable vaild edges
/EXLVI Reference voltsge input for low voltage indicator
P121 I/O port (An external oscillation circuit is not used)
/X1 Connecting resonator for main system clock oscillation
P122 I/O port (An external oscillation circuit is not used)
/X2 Connecting resonator for main system clock oscillation
/EXCLK External clock input for main system clock
P123 I/O port (An external oscillation circuit is not used)
XT1 connecting resonator for subsystem clock oscillation
P123 I/O port (An external oscillation circuit is not used)
XT1 Connecting resonator for subsystem clock oscillation
P124 I/O port (An external oscillation circuit is not used)
/XT2 Connecting resonator for subsystem clock oscillation
/EXCLKS External clock input for subsystem clock
P130 Output port
P140 I/O port
/PCL Clock output
/INTP6 External interrupt request input with specifiable vaild edge
P141 I/O port
/PCL Clock output
/INTP7 External interrupt requwst input with specifiable vaild edge
/BUSY0 Busy signal input for serial interface (AUTOCSI)
P142 I/O port
/SCKA0 Clock input/output for serial interface (AUTOCSI)
P143 I/O port
/SIA0 Serial data input to serial interface
P144 I/O port
/SOA0 Serial data output from serial interface (AUTOCSI)
P145 I/O port
/STB0 Strobe signal input to serial interface (AUTOCSI)

- 2-16 -
❏ BLOCK DIAGRAM

2-17 2-18
❏ SCHEMATIC DIAGRAMS
• MAIN SCHEMATIC DIAGRAM

2-19 2-20
• MAIN-2 SCHEMATIC DIAGRAM

2-21 2-22
• FRONT SCHEMATIC DIAGRAM

2-23 2-24
• CD SCHEMATIC DIAGRAM

2-25 2-26
❏ PRINTED CIRCUIT BOARD DIAGRAMS
• MAIN P.C. BOARD DIAGRAM

2-27 2-28
• FRONT/TRIM P.C. BOARD DIAGRAM • LED P.C. BOARD

2-29 2-30
• CD P.C. BOARD

2-31 2-32
SECTION 3. EXPLODED VIEWS
❏ CABINET AND MAIN FRAME SECTION

263
450
450

283 268

A43 453
*Accessory
A40
455 453
278 273 835

279 272 A26

284 276 A49

275 274 818

454
280
260
282 A50 A41 267
302

450
451
269 255 456
254

300 450 266

256
A46
A42 457
454 450

251 257
270 450
253
252

250
265

264

3-1 3-2
❏ MECHANISM (PICK-UP)

4 1

A03

3-3 3-4