Record Bias Current Adjustment; Record Level Adjustment; Adjustment And Connection Location - Sony HCD-V4800 Service Manual

Record bias Current Adjustment

Procedure:
1. Mode: Record
pin 6 (L-CH) of IC1501 on the MAIN board.
pin #¶ (R-CH) of IC1501 on the MAIN board.

1) 315 Hz

50 mV (–23.8 dB)
2) 10 kHz

AF OSC
600 Ω
attenuator
pin 2 (GND) of CN207 on the MAIN board.
2. Mode: Playback
recorded
portion
set
MAIN board
CN207 (pin 3 : L-CH)
Confirm playback the signal recorded in step 1 become adjustable
limits as follows.
If these levels do not adjustable limits, adjustment 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 out-
put of 10 kHz: ±0.5 dB
Adjustment Location: AUDIO board
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 Ω
attenuator
pin 2 (GND) of CN207 on the MAIN board.
2. Mode: Playback
recorded
portion
set
MAIN board
CN207 (pin 3 : L-CH)
Confirm playback the signal recorded in step 1 become adjustable
limits as follows.
If these levels do not adjustable limits, adjustment the RV1501 (L-
CH) and RV1551 (R-CH) on the MAIN board to repeat steps 1
and 2.
Adjustable limits:
CN207 PB level: 47.3 to 53.1 mV (–24.3 to –23.3 dB)
Adjustment Location: MAIN board
DECK B
blank tape
CS-123
set
level meter
+
–
(pin 1 : R-CH)
blank tape
CS-123
set
level meter
+
–
(pin 1 : R-CH)

Adjustment and Connection Location:

[AUDIO BOARD] (Conductor Side)
RECORD
BAIS
R L
RV301 ® L
RV441 RV341
RV401 ® R
PB LEVEL
– DECK B –
[MAIN BOARD] (Component Side)
IC201
– 20 –
TAPE SPEED
(NORMAL)
(HIGH)
RV651
RV652
®
®
RV311
PB L ®
LEVEL RV411
R ®
– DECK A –
RV1501
21 1
1 3
IC1501
CN205
22 42
CN207
IC301
RV1551
RECORD LEVEL