XR-1800RD - Sony Car Audio Service Manual (repair manual). Page 9

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9
4. Repeat the above adjustment for the REV PB mode.
5. Check that output level difference between FWD PB mode
and REV PB mode is within 4 dB.
Adjustment Location: PB head
Tape Speed Adjustment
Setting:
Procedure:
1. Put the set into the FWD PB mode.
2. Adjust adjustment resistor for inside capstan motor so that the
reading on the frequency counter becomes in 3,015 Hz.
Specified Value: 2,940 to 3,090 Hz
Adjustment Location: See page 12.
FWD 
REV 
adjustment 
screws
frequency counter
test tape 
WS-48A
(3 kHz, 0 dB)
set
speaker out terminal
+
TUNER  SECTION
0 dB=1 µV
Cautions during repair
When the tuner unit is defective, replace it by a new one be-
cause its internal block is difficult to repair.
Note:
Adjust the tuner section in the sequence shown below.
1. FM Auto Scan/Stop Level Adjustment
2. FM Noise Focus Adjustment
3. FM Stereo Separation Adjustment
4. FM Signal Meter Adjustment
5. MW Auto Scan/Stop Level Adjustment
FM Auto Scan/Stop Level Adjustment
Setting:
[TUNER]
 button: FM 1
Procedure:
1. Tune the set to 98.0 MHz.
2. Connect the digital voltmeter to TP101 (SD) on MAIN board.
3. Adjust RV2 on TU100 so that the reading on the digital volt-
meter changes point from low to high.
Adjustment Location: See page 12.
FM RF signal 
generator
dummy
antenna
Carrier frequency : 98.0 MHz
Output level
: 28 dB (25.1 
µ
V)
Mode
: mono
Modulation
: 1 kHz, 22.5 kHz deviation (30%)
antenna
jack (CN900)
set
50 
50 
0.1pF
+
TP101 (SD)
MAIN board
digital 
voltmeter
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