Sony HCD-XB66 Service Manual page 19

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
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 output
of 10 kHz: 0 ± 0.5 dB
Adjustment Location: AUDIO and MAIN boards
Record Level Adjustment
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 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: 36.7 to 41.1 mV (–26.5 to –25.5 dB)
Adjustment Location: MAIN board
DECK B
blank tape
CN-123
set
level meter
+
–
(Pin 1 : R-CH)
DECK B
blank tape
CS-123
set
level meter
+
–
(Pin 1 : R-CH)
Adjustment Location:
[MAIN BOARD] (Component Side)
[AUDIO BOARD] (Conductor Side)
RECORD
BIAS CURRENT
R L
RV301
 RV341
L

RV441


R
PB LEVEL

RV401
– DECK B –
* As the adjustment parts is mounted on the component side, ad-
just it through a hole in the AUDIO board form conductor side.
(Except RV431, 441)
– 19 –
RV1501
CN207
1 3
IC1501
CN205
RV1551
RECORD
LEVEL
TAPE SPEED
(NORMAL) (HIGH)
RV651 RV652

RV311 L
PB

LEVEL

RV411 R
– DECK A –