ALIGNMENT AND ADJUSTMENT
ALIGNMENT AND TEST POINT LOCATIONS
ALIGNMENT PREPARATION
Test Equipments Required
Quarz sensor (32.768 kHz)
Frequency counter
AC SSVM
AM signal generator
DC SSVM
Pulse generator
Notes:
Use non-metalic tuning tools.
The test equipment and receiver should be warmed up for at least 10 minutes before proceeding with alignment.
The signal level from the generator should be kept as low as possible to obtain an usable output.
Before alignment, program test frequencies as follows:
1. Press and hold 1 and ENT key then press POWER key to turn on the LCD.
2. LCD displays all segments.
3. Press POWER key again to turn on the receiver.
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ALIGNMENT PROCEDURES
Clock Alignment
Control Setting
Power switch: ON.
Test Instrument Connection
Adjust
Set quartz sensor (32.768 kHz)
to test set.
TC201
Result
Adjust TC201 for 0.25 sec/DAY
on the quartz sensor.
VCO Alignment
Control Setting
Power switch: ON.
Test Instrument Connection
Adjust
Connect DC SSVM to TP5 and
connect frequency counter to
TP6. See Figure 1
L14
L11
Result
1. Press MON to receive
29.999 MHz, and check
210.5 volts on the DC
SSVM.
2. Press MON again to receive
150 kHz and adjust L14 for
210.5 volts on the DC SSVM.
3. Adjust L11 for 45.150
MHz10 Hz on the frequency
counter.
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2nd Local OSC Alignment
Control Setting
Power switch: ON.
Receive mode: AM.
Test Instrument Connection
Adjust
Connect frequency counter to
TP1 through 100 pF capacitor.
See Figure 2
VR2
L6
Result
1. Press BAND to select LW
band then press 4 to receive
332.5 kHz and adjust VR2 for
44.5475 MHz+/-10 Hz on the
frequency counter.
2. Press 6 to receive 337.4 kHz
and adjust L6 for 44.54255
MHz+10 Hz on the frequency
counter.
3. Repeat steps 1 and 2 until no
further improvement is observed.
4. Press 5 and check frequency
counter to 44.545 MHZ200
Hz.
IF Alignment
Control Setting
Power switch: ON.
Receive mode: AM.
Test Instrument Connection
Adjust
Connect signal generator to
Lo-Z ANT jack and AC SSVM,
oscilloscope, frequency
counter, and 8-ohm dummy
load to EXT SPKR (J4) jack.
See Figure 3.
T7
T12
T8
T9
L8
- 1 2-
Result
1. Press BAND to select SW
band then press 0 key to receive 10 MHz.
2. Set the signal generator to 10
MHz, 30% modulation with 1
kHz and adjust T7, T12, T8,
T9, and L8 for maximum output. Keep output of the signal
generator as low as possible
during alignment.
RF Alignment
Control Setting
Power switch: ON.
Test Instrument Connection
Adjust
Same as IF alignment
L5-2
Receive mode: AM.
Result
1. Press BAND to select LW
band then press 2 to receive
150 kHz and set signal gener-ator to 150 kHz.
2. Adjust L5-2 to maximum output.
Same as above.
Same as above
L5-1
1. Press BAND to select MW
band then press 2 to receive
1000 kHz and set signal generator to 1000 kHz.
2. Adjust L5-1 to maximum output.
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Control Setting
Power switch: ON.
Test Instrument Connection
Same as IF alignment
Receive mode: AM.
Adjust
T4
TC3
Result
1. Press BAND to select SW
band then press 1 to receive
2 MHz and set signal generator to 2 MHz.
2. Adjust T4 for maximum output.
3. Press 3 to receive 4.2 MHz
and set signal generator to
4.2 MHz.
4. Adjust TC3 for maximum output.
5. Repeat steps 1 to 4 until no
further improvement is observed.
Same as above.
Same as above.
T3
TC2
1. Press 4 to receive 5.18 MHz
and set signal generator to
5.18 MHz.
2. Adjust T3 for maximum output.
3. Press 6 to receive 10.88 MHz
and set signal generator to
10.88 MHz.
4. Adjust TC2 for maximum output.
5. Repeat steps 1 to 4 until no
further improvement is observed.
Same as above.
Same as above
T2
TC1
1. Press 7 to receive 13.43 MHz
and set signal generator to
13.43 MHz.
2. Adjust T2 for maximum output.
3. Press 9 to receive 28.16 MHz
and set signal generator to
28.16 MHz.
4. Adjust TC1 for maximum output.
5. Repeat steps 1 to 4 until no
further improvement is observed.
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Noise Blanker Alignment
Control Setting
Power switch: ON.
Receive mode: AM.
Test Instrument Connection
Connect signal generator with
pulse generator to ANT (Lo-Z)
jack and connect oscilloscope
to TP3. See Figure 4.
Adjust
VR1
Result
1. Press BAND to select SW
band then press 0 key to receive the 10 MHz signal.
2. Press NB key to activate the
noise blanker and rotate VR1
fully counterclockwise.
3. Set the signal generator frequency to 10 MHz, modulation frequency 1 kHz and 30%
modulation.
4. Adjust the signal generator
output to set (S+N)/N to about
10 dB and set AF output to
obtain 1 V p-p on the osciloscopeat the EXT SPKR
jack.
5. Set the pulse generator pulse
to pulse width: 1 us and duty
cycle: 1 ms and adjust the AF
output to read 2 V p-p at the
EXT SPKR jack.
6. Check noise waveform on the
oscilloscope connected to TP3
for 0.5-0.7 V.
7. Turn on the signal generator
modulation and adjust VR1 to
mute the audio output during
noise period.
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