HCD-N555AVK, LBT-N555AVK - Sony Audio Service Manual (repair manual). Page 12

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LD/VIDEO IN
1) 315Hz
2) 10kHz

50mV (–23.8dB)

blank tape
CS-123

AF OSC

attenuator

600

set

Procedure :
1. Mode : record

2. Mode : Playback

recorded
position

set

level meter

CN 403 (Pin 

3

 : L-CH)

(Pin 

1

 : R-CH)

Confirm playback the signal recorded in step 1 become adjustment
level as follows.
If these levels do not adjustment level, adjust the RV341 (L-CH) and
RV441 (R-CH) on the MD board to repeat step 1 and 2.

Adjustment level : The playback output of 10 kHz level difference

against 315Hz reference should be ± 0.5 dB

Adjustment Location : MD board

Procedure :
1. Mode : record

LD/VIDEO IN
315Hz, 50mV (–23.8dB)

AF OSC

attenuator

600

blank tape
CS-123

set

2. Mode : Playback

recorded
position

set

level meter

main board
CN403 (Pin 

3

 : L-CH)

(Pin 

1

 : R-CH)

Confirm playback the signal recorded in step 1 become adjustment
level as follows.
If these levels do not adjustment level, adjust the RV301 (L-CH) and
RV351 (R-CH) on the main board to repeat steps 1 and 2.

Adjustment level: CN 403 PB level: 47.2 to 53.0 mV

(–24.3 to –23.3 dB)

Adjustment Location : main board

[MAIN BOARD] (Component Side)

RV351 REC LEVEL (R-CH)

RV301 REC LEVEL
(L-CH)

1

3

CN403

– DECK B –

RECORD

BIAS

L

RV441 RV341

(NORMAL)

RV651

¬

R

TAPE SPEED

PB

LEVEL

L 

¬

R 

¬

– DECK A –

PB LEVEL

RV301

¬

L

RV401

¬

R

[MD BOARD] (Conductor Side)

(HIGH)

RV652

¬