Tuner Section - Sony XR-C6103SP Service Manual

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DOLBY Level Adjustment
Setting:
[3]
Preset (DOLBY) button
SEL (BAS) button
SEL (TRE) button
SEL (BAL) button
SEL (FAD) button
SEL (VOL) button
D-BASS control
test tape
P-4-D400
(400 Hz, 0 dB)
Procedure:
1. Put the set into the FWD PB mode.
2. Adjust RV121 (L-CH) and RV221 (R-CH) so that the level
meter reading is –6 ± 1 dB (0.35 to 0.43 V).
Adjustment Location: See page 18.
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: NR OFF
: Center
: Center
: Center
: Center
: Maximum
: OFF
MAIN board
TP (DOLBY L)/
level meter
TP (DOLBY R)
+
set
–
MAIN board
TP (GND)
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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.
Note: Adjust the tuner section in the sequence shown below.
1. FM Auto Scan/Stop Level Adjustment
2. FM Stereo Separation Adjustment
3. AM (MW) Auto Scan/Stop Level Adjustment
4. FM POLAR Adjustment
FM Auto Scan/Stop Level Adjustment
Setting:
[SOURCE]
button: FM
FM RF signal
generator
Carrier frequency : 98.0 MHz
Output level
Mode
Modulation
Procedure:
1. Set to the test mode. (See page 14).
[SOURCE]
2. Push the
Q Q
3 6 7 1 3 1 5
FM
3. Push the preset
FM
4. Adjust with the volume RV2 on TU1 so that the "FM" indica-
tion turns to "FM0" indication on the display window.
But, in case of already indicated "FM0", turn the RV2 so that
put out light "0" indication and adjustment.
Adjustment Location: See page 18.
co
.
– 15 –
9 4 2 8
0 dB=1 µV
antenna jack (J1)
0.01 µ F
set
: 22 dB (12.6 µ V)
: mono
: 1 kHz, 22.5 kHz deviation (30%)
button and set to FM.
Display
0 5 8 2 9 9 4 2 8
[3]
button.
Display
Display
m
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SHUF1
SHUF1
SHUF1