HCD-GRX90AV, HCD-RXD10AV, MHC-GRX90AV - Sony Audio Service Manual (repair manual). Page 16

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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.
(After recording, press the  – 

0  button without stopping will

return to the position where recording was started.)

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

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

2. Insert a tape into deck B, press the  

r REC  button, and then

press the  

(  button to start recording.

3. Mode: Record

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 ± 1.0 dB.

Adjustment Location: AUDIO board

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 au-
tomatically switch to VIDEO.
(After recording, press the  – 

0  button without stopping will

return to the position where recording was started.)

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

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

2. Insert a tape into deck B, press the  

r REC  button, and then

press the  

(  button to start recording.

3. Mode: Record

4. Mode: Playback

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

[AUDIO BOARD] (Conductor Side)

4. Mode: Playback

[MAIN BOARD] (Conductor Side)

recorded
position

level meter

set

MD OUT

AF OSC

VIDEO (AUDIO) IN
1) 315 Hz
2) 10 kHz

blank tape
CS-123

set

attenuator

600 

Ω

} 50 mV (–23.8 dB)

AF OSC

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

blank tape
CS-123

set

attenuator

600 

Ω

recorded
position

level meter

set

MD OUT

RV441 RV341

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

RV301 RV401

RV341(Lch),RV441(Rch)
Record Bias

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

RV311

RV411

IC301

Record Level (L CH)
RV301

CN131

RV351
Record Level (R CH)

56

43

42

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