HCD-XB66, HCD-XB660, LBT-XB66, LBT-XB660 - Sony Audio Service Manual (repair manual). Page 19

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Procedure:
1. Mode: Record

2. Mode:  Playback

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

Procedure:
1. Mode: Record

2. Mode: Playback

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

attenuator

set

Pin 

6

 (L-CH) of IC1501 on the MAIN board.

Pin 

#¶

 (R-CH) of IC1501 on the MAIN board.

1) 315 Hz
2) 10 kHz

50 mV (–23.8 dB)







Pin 

2

 (GND) of CN207 on the MAIN 

board.

600 

Ω

blank tape
CN-123

AF OSC

+
–

set

recorded
portion

CN207 (Pin 

3

: L-CH)

(Pin 

1

: R-CH)

level meter

set

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)

blank tape
CS-123

Pin 

2

  (GND) of CN207 on the MAIN board.

600 

Ω

attenuator

AF OSC

+
–

set

recorded
portion

CN207 (Pin 

3

: L-CH)

(Pin 

1

: R-CH)

level meter

[MAIN  BOARD] (Component Side)

[AUDIO  BOARD] (Conductor Side)

* 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)

CN207

CN205

RECORD
LEVEL

IC1501

RV1501

RV1551

3

1

RV651

RV311 L

RV411 R

RV652

(NORMAL) (HIGH)

TAPE SPEED

PB
LEVEL

– DECK A –

– DECK B –

        







RECORD
BIAS CURRENT

RV341

RV441

RV301

RV401

L

R

PB LEVEL

R L

  









