Sony HCD-J3MD Service Manual page 44

Playback Level Adjustment
Procedure:
Mode: FWD playback
test tape
WS-48B
(3kHz, 0dB)
set
Adjust RV431 (L-CH) and RV481 (R-CH), so that adjustment within
the following adjustment level.
Adjustment level:
LINE OUT level: –7.7 ± 0.5 dB (301.5 to 338.5 mV)
Level difference between the channels: within ± 0.5 dB
Confirm that the LINE OUT level does not change even though
play and stop are repeated.
Record Bias Adjustment
Procedure:
1. Record mode.
LINE IN
1) 315 Hz
2) 10 kHz
AF OSC
600 Ω
attenuator
2. Playback mode.
recorded
position
set
3. Confirm playback the signal recorded in step 1 become
adjustment level as follows.
4. If these levels do not adjustment level, adjust the RV440 (L-
CH) and RV490 (R-CH), to repeat steps 1 to 3.
Adjustment level:
The playback outpout of 10 kHz level difference adjust
315 Hz reference should be 0 dB ± 0.5 dB.
44
frequency counter
LINE OUT
} 50 mV (–23.8 dB)
blank tape
CS-123
set
level meter
LINE OUT
Record Level Adjustment
Procedure:
1. Record mode.
LINE IN
315Hz 50 mV (–23.8 dB)
AF OSC
600 Ω
attenuator
2. Playback mode.
recorded
position
set
3. Confirm playback the signal recorded in step 1 become
adjustment level as follows.
4. If these levels do not adjustment level, adjust the RV401 (L-
CH) and RV451 (R-CH), on the MAIN board to repeat steps 1
to 3.
Adjustment level:
LINE OUT level: –23.8 dB ± 0.5 dB (47.2 to 53.0 mV)
Adjustment Location: TC board
Record
level
Playback
Record level
bias
RV440 RV490
blank tape
CS-123
set
level meter
LINE OUT
RV401
RV451
RV481
RV431