![background image](http://html.mh-extra.com/html/sony/hcd-j3md/hcd-j3md_service-manual_420791044.webp)
44
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.
Playback Level Adjustment
Procedure:
Mode: FWD playback
test tape
WS-48B
(3kHz, 0dB)
set
LINE OUT
frequency counter
Record Level Adjustment
Procedure:
1.
Record mode.
2.
Playback mode.
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
AF OSC
LINE IN
315Hz 50 mV (–23.8 dB)
blank tape
CS-123
set
attenuator
600
Ω
recorded
position
set
LINE OUT
level meter
Record
level
Playback
level
Record
bias
RV401
RV451
RV481
RV431
RV440 RV490
Record Bias Adjustment
Procedure:
1.
Record mode.
AF OSC
LINE IN
1) 315 Hz
2) 10 kHz
blank tape
CS-123
set
attenuator
600
Ω
} 50 mV (–23.8 dB)
2.
Playback mode.
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.
recorded
position
set
LINE OUT
level meter
Summary of Contents for HCD-J3MD
Page 20: ...20 ...