Tuner Section - Sony XR-1800 Service Manual

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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
See the adjustment location from on page 13 for the
TE
L 13942296513
adjustment.
Tape Speed Adjustment
Setting:
test tape
WS-48A
(3 kHz, 0 dB)
set
Procedure:
1. Put the set into the FWD PB mode.
2. Adjust adjustment resistor for inside capstan motor so that the
reading on the speed checker or frequency counter becomes in
specification.
Specification: Constant speed
Speed checker
–2 to +3%
Adjustment Location: See page 13.
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
FWD

adjustment

screws


REV
speed checker
or
frequency counter
4 Ω
– +
speaker out terminal
Frequency counter
2,940 to 3,090 Hz
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TUNER SECTION

XR-1800 E model, a tuner section is no adjustment.
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. MW Auto Scan/Stop Level Adjustment
FM Auto Scan/Stop Level Adjustment
Setting:
[TUNER]
button: FM 1
FREQUENCY SELECT switch: FM50 k (XR-1804 only)
FM RF signal
generator
Carrier frequency : 98.0 MHz
Output level
Mode
Modulation
Q Q
3 6 7 1 3 1 5
MAIN board
TP2 (SD)
Procedure:
1. Tune the set to 98.0 MHz.
2. Connect the digital voltmeter to TP2 (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 13.
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0.1pF
dummy
antenna
antenna
50 Ω
jack (CN900)
50 Ω
set
: 28 dB (25.1 µ V)
: mono
: 1 kHz, 22.5 kHz deviation (30%)
digital
0 5 8 2 9 9 4 2 8
voltmeter
+
–
m
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