Sony XR-C8220, Service Manual

Page: 15 / 52

– 15 –
Dolby Level Adjustment
Setting:
[SHIFT]
button : ON (light up SET UP and
PLAY MODE)
Preset
[4]
(PLAY MODE)
n
[5]
(
n
) buttons : NR off
SOUND (BAS) button : Center
SOUND (TRE) button : Center
SOUND (BAL) button : Center
SOUND (FAD) button : Center
SOUND (VOL) button : Maximum
Procedure:
1. Put the set into the FWD PB mode.
2. Adjust RV230 (L-CH) and RV240 (R-CH) so that the level
meter reading is –6±0.5 dB (0.37 to 0.41 V).
Adjustment Location: See page 18.
TUNER SECTION
0 dB=1µV
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 Stereo Separation Adjustment (WIDE)
3. FM Stereo Separation Adjustment (NARROW)
4. AM Auto Scan/Stop Level Adjustment
FM Auto Scan/Stop Level Adjustment
Setting:
[SOURCE]
button : FM
FREQUENCY SELECT switch (E model): FM 200 k
Procedure:
1. Set to the test mode. (See page 14)
2. Push the
[SOURCE]
button and set to FM.
Display
3. Push the preset
[3]
button.
Display
4. Adjust with the volume RV2 on TUX10 so that the “FM” indi-
cation 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.
Display
Adjustment Location: See page 18.
set
+
–
test tape
P-4-D400
(400Hz, 0 dB)
level meter
MAIN board
TP (DOLBY-L)/
TP (DOLBY-R)
      
set
antenna jack
FM RF signal
generator
Carrier frequency : 97.9 MHz
Output level : 22 dB (12.6
µ
V)
Mode : mono
Modulation : 1 kHz, 22.5 kHz deviation (30%)
0.01
µ
F
SHUF
SHUF
SHUF