Sony HCD-D390 - Compact Audio And Video System Service Manual page 20

Record Bias Current Adjustment
Procedure:
1. Mode: record
Pin 6 (L-CH) of IC1501 on the main board.
Pin #¶ (L-CH) of IC1501 on the main board.
1) 315 Hz
2) 10 kHz
AF OSC
600
attenuator
Pin 2 (GND) of ICN207 on the main board.
2. Mode: Playback
recorded
portion
set
CN207 (Pin 1 : L-CH)
Confirm playback that the signal recorded in step 1 becomes adjustable
limits as follows.
If these levels are not adjustable limits, adjust the RV341 (L-CH) and
RV441 (R-CH) on the AUDIO board to repeat steps 1 and 2.
Adjustable limits: Playback output of 315 Hz to playback output
of 10kHz: 0±0.5 dB
Adjustment Location: AUDIO and main boards
Record Level Adjustment DECK B
Procedure:
1. Mode: record
Pin 6 (L-CH) of IC1501 on the main board.
Pin #¶ (R-CH) of IC1501 on the main board.
315 Hz, 50 mV (–23.8 dB)
AF OSC
600
attenuator
Pin 2 (GND) of CN207 on the main board.
2. Mode: Playback
recorded
portion
set
CN207 (Pin 1 : L-CH)
Confirm playback that the signal recorded in step 1 becomes
adjustable limits as follows.
If these levels are not adjustable limits, adjust the RV1501 (L-CH)
and RV1551 (R-CH) on the main board to repeat steps 1 and 2.
DECK B
50 mV (–23.8 dB)
blank tape
CN-123
set
level meter
+
–
(Pin 3 : R-CH)
blank tape
CS-123
set
level meter
+
–
(Pin 3 : R-CH)
Adjustable limits:
CN207 PB level: 47.3 to 53.1 mV (–24.3 to –23.3 dB)
Adjustment Location: main board
[MAIN BOARD] (Component Side)
IC201
[AUDIO BOARD] (Conductor Side)
RECORD
BAIS
R
RV301 ® L
RV441 RV341
RV401 ® R
PB LEVEL
– DECK B –
— 20 —
RV1501
IC1501
CN207
RV1551
IC301
RECORD LEVEL
TAPE SPEED
L
(NORMAL)
RV651
®
RV311
PB
LEVEL RV411
– DECK A –
CN205
(HIGH)
RV652
®
L ®
R ®