HCD-XB8, LBT-XB8AV, MDS-B5 - Sony Audio Service Manual (repair manual). Page 13

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INTRODUCTION
When set to the test mode performed in 

,

when the tape is rewound after recording, the “REC memory

mode” which rewinds only the recorded portion and playback is
set.
This “REC memory mode” is convenient for performing this ad-
justment. During recording, the input signal FUNCTION will auto-
matically switch to VIDEO.

1. Press  FUNCTION  button to select VIDEO. (This step is not

necessary if the above test mode has already been set.)

2. Load a tape into deck B, and press the  

r REC  button.

3. Mode: Record

set

VIDEO (AUDIO) IN
1) 315Hz
2) 10kHz

} 50 mV (–23.8 dB)

AF OSC

attenuator

600 

Ω

blank tape
CS-123

4. Mode: Playback

recorded
position

main board
CN403 Pin 

3

 (L-CH)

Pin 

1

 (R-CH)

set

level meter

5. Confirm playback the signal recorded in step 2 become adjust-

ment level as follows.
If these levels do not adjustment level, adjust the RV341 (L-
CH) and RV441 (R-CH) on the AUDIO board to repeat steps 3
and 4.

Adjustment level: The playback output of 10 kHz level difference

against 315 Hz reference should be ± 0.5 dB.

Adjustment Location: AUDIO board

RV341(Lch),RV441(Rch)
Record Bias

RV301

RV401

RV441 RV341

RV301(Lch),RV401(Rch)
Playback Level (Deck B)

RV651 (Normal Speed)
RV652 (High Speed)
Tape Speed

RV652

RV651

RV311

RV411

RV311(Lch),RV411(Rch)
Playback Level (Deck A)

INTRODUCTION
When set to the test mode performed in 

, when the tape is rewound after recording, the “REC memory

mode” which rewinds only the recorded portion and playback is
set.
This “REC memory mode” is convenient for performing this
adjustment. During recording, the input signal FUNCTION will
automatically switch to VIDEO.

1. Press  FUNCTION  button to select VIDEO. (This step is not

necessary if the above test mode has already been set.)

2. Load a tape into deck B, and press the  

r REC  button.

3. Mode: Record

VIDEO (AUDIO) IN
315 Hz 50 mV (–23.8 dB)

set

blank tape
CS-123

600 

Ω

attenuator

AF OSC

4. Mode: Playback

level meter

set

main board
CN403 Pin 

3

 (L-CH)

Pin 

1

 (R-CH)

recorded
position

5. Confirm playback the signal recorded in step 2 become adjust-

ment 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 3
and 4.

Adjustment level:
CN403 playback level: 47.2 to 53.0 mV (–24.3 to –23.3 dB)

Adjustment Location: MAIN board

Adjustment Location
[AUDIO BOARD] (Conductor Side)

RV301
Record Level (L CH)

IC401

RV351
Record Level
(R CH)

CN403

1

3

[MAIN BOARD] (Component Side)