21
SHUF1
PRESET
SHUF1
PRESET
SHUF1
antenna
terminal
FM RF signal
generator
0.01
µ
F
set
TUNER SECTION
Cautions during repair
When the tuner unit is defective, replace it by a new one because
its internal block is difficult to repair.
Procedure :
1. Set to the test mode.
2. Push the SOURCE button and set to FM.
Display
FM Auto Scan/Stop Level Adjustment
Setting :
SOURCE button
: FM
FREQUENCY SELECT switch : FM 200k
3. Push the preset 3 button.
Display
4. Adjust with the volume RV2 on TU1 so that the “FM”
indication turns to “2” indication on the display window.
But, in case of already indicated “2”, turn the RV2 so that put
out light “2” indication and adjustment.
Display
0 dB = 1 µV
Note on Adjustment
The adjustments of tuner section, should be performed according
to the following sequence.
1. FM Auto Scan/Stop Level Adjustment
2. FM Stereo Separation Adjustment
3. AM Auto Scan/Stop Level Adjustment
Carrier frequency : 97.9 MHz
Output level
: 22 dB (12.6 µV)
Mode
: mono
Modulation
: 1 kHz, 22.5 kHz deviation (30%)
Adjustment Location : See page 23.
main board
TP-L
TP-R
test tape
P-4-D400
(400 Hz, 0 dB)
level meter
set
set
frequency counter
test tape
WS-48A
(3 kHz, 0 dB)
AUDIO OUT REAR
10 k
Ω
See the adjustment location from on page 23 for the
adjustment.
TAPE SECTION
Tape Speed Adjustment
Procedure :
1. Put the set into the FWD PB mode.
Specification : Constant speed
Frequency counter
3,010 to 3,030 Hz
Adjustment Location : Capstan motor internal volume
(See page 23)
DOLBY Level Adjustment
Setting :
Preset 3 (SHUF/
;
) button : Light down mark
;
(DOLBY OFF)
Procedure :
1. Put the set into the FWD PB mode.
2. Adjust RV100 (L-CH) and RV200 (R-CH) on main board so
that level meter reading is – 6 ± 0.5 dB (0.37 to 0.41 V).
Adjustment Location : See page 23.
0 dB = 0.775 V
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