Tuner Section - Sony XR-C6100 Service Manual

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
MAIN board
test tape
TP (DOLBY )
P-4-D400
(400Hz, 0dB)
set
Procedure:
1. Put the set into the FWD PB mode.
2. Adjust RV231 (L-CH) and RV131 (R-CH) so that the level
meter reading is –6±1 dB (0.35 to 0.44 V).
Adjustment Location: See page 16.
: NR OFF
: Center
: Center
: Center
: Center
: Maximum
: OFF
L-CH: IC301 7
R-CH: IC301 @¢
level meter
+
–
MAIN board
TP (GND)

TUNER SECTION

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:
[SOURCE]
button: FM
FREQUENCY SELECT switch: FM50 k
FM RF signal
generator
Carrier frequency : 98.0 MHz
Output level
Mode
Modulation
Procedure:
1. Set to the test mode. (See page 13.)
[SOURCE]
2. Push the
FM
3. 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 16.
– 14 –
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
button and set to FM.
Display
98. 0 0
Display
98. 0 0
SHUF1
SHUF1