Sony HCD-H331 Service Manual page 11

Record Bias Adjustment DECK B
Procedure :
1. Mode : record
AF OSC
1) 315 Hz
51.2mV (–23.6dB)
2) 10kHz
47k Ω
attenuator
47k Ω
Input point (see page 9)
2. Mode : Playback
record
portion
set
3. Confirm playback the signal recorded in step1 become adjustment
level as follows.
4. If these levels do not adjustment level, adjustment the RV304 (L-
CH) and RV404 (R-CH) to repeat step 1 and 4.
Adjustment level : Playback output of 315Hz to playback output
of 10kHz : 0 ± 0.5dB
Adjustment Location : MAIN board.
Record Level Adjustment DECK B
Procedure :
1. Mode : record
AF OSC
315Hz 51.2mV (–23.6dB)
47k Ω
attenuator
47k Ω
Input point (see page 9)
2. Mode : playback
record
portion
set
3. Confirm playback the signal recorded in step1 become adjustment
level as follows.
4. If these levels do not adjustment level, adjustment the RV303 (L-
CH) and RV403 (R-CH) to repeat steps 1 and 2.
blank tape
CS-123
set
level meter
+
–
Output level measurement point
(see page 9)
blank tape
CS-123
set
level meter
+
–
Output level measurement point
(see page 9)
Adjustment Level :
OUTPUT level : –23.3dB to –24.3dB (47.3 to 53.1mV)
Adjustment Location : MAIN board.
Adjustment Location :
[ MAIN BOARD ] – Component side –
– 11 –
CN307
CN308
RV303
IC303
IC901
RV403
RV302
RV401
RV402
RV301
RV304
RV380
RV404