Read Sony XR-1800RD Service Manual online
9
4. Repeat the above adjustment for the REV PB mode.
5. Check that output level difference between FWD 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
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
screws
frequency counter
test tape
WS-48A
(3 kHz, 0 dB)
WS-48A
(3 kHz, 0 dB)
set
speaker out terminal
–
+
4
Ω
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.
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
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-
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
Output level
: 28 dB (25.1
µ
V)
Mode
: mono
Modulation
: 1 kHz, 22.5 kHz deviation (30%)
antenna
jack (CN900)
jack (CN900)
set
50
Ω
50
Ω
0.1pF
+
–
–
TP101 (SD)
MAIN board
digital
voltmeter
voltmeter
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