Sony HCD-GR8 Service Manual page 35

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

50 mV (–23.8 dB)
2) 10 kHz

AF OSC
600 Ω
attenuator
Pin 2 (GND) of ICN207 on the main board.
2. Mode: Playback
recorded
portion
set
CN207 (Pin 1 : 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 output
of 10 kHz: ±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 Ω
attenuator
Pin 2 (GND) of CN207 on the main board.
2. Mode: Playback
recorded
portion
set
CN207 (Pin 1 : 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)
DECK B
blank tape
CN-123
set
level meter
+
–
(Pin 3 : R-CH)
blank tape
CS-123
set
level meter
+
–
(Pin 3 : R-CH)
Adjustment Location: main board
[MAIN BOARD] (Component Side)
IC201
[AUDIO BOARD] (Conductor Side)
RECORD
BAIS
R L
RV301 ® L
RV441 RV341
RV401 ® R
PB LEVEL
– DECK B –
– 35 –
RV1501
IC1501
CN205
CN207
IC301
RV1551
RECORD LEVEL
TAPE SPEED
(NORMAL)
(HIGH)
RV651
RV652
®
®
RV311
PB L ®
LEVEL RV411
R ®
– DECK A –