Sony XR-C7220, Руководство по обслуживанию

Страница: 14 / 40

– 14 –
Dolby Level Adjustment
Setting:
[SHIFT]
button : ON
Preset
[3]
(PLAY MODE) and
[4]
(
→
) buttons : NR OFF
SOUND (BAS) button : Center
SOUND (TRE) button : Center
SOUND (BAL) button : Center
SOUND (FAD) button : Center
SOUND (VOL) button : Maximum
D-BASS control : OFF
Procedure:
1. Put the set into the FWD PB mode.
2. Adjust RV101 (L-CH) and RV201 (R-CH) so that the level
meter reading is –6±0.5 dB (0.37 to 0.41 V).
Adjustment Location: See page 16.
set
+
–
test tape
P-4-D400
(400Hz, 0 dB)
level meter
MAIN board
MAIN board
TP (GND)
TP (DOLBY-L)/
TP (DOLBY-R)
      
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 Stereo Separation Adjustment
3. MW Auto Scan/Stop Level Adjustment
FM Auto Scan/Stop Level Adjustment
Setting:
[SOURCE]
button: FM
FREQUENCY SELECT switch: FM200 k
Procedure:
1. Set to the test mode. (See page 13)
2. Push the
[SOURCE]
button and set to FM.
Display
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.
Display
Adjustment Location: See page 16.
FM RF signal
generator
Carrier frequency : 97.9 MHz
Output level
: 22 dB (12.6
µ
V)
Mode : mono
Modulation : 1 kHz, 75 kHz deviation
0.01
µ
F
set
antenna jack (J1)
(XR-C7300/C7300W only)
0 dB=1 µV
XR-C7220, the tuner section has no adjustment.
SHUF
SHUF