HCD-XGR90AV, LBT-XGR90AV - Sony Audio Service Manual (repair manual). Page 19

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19
HCD-XGR90AV
REC Bias Adjustment      DECK B

Procedure:
1. Mode: Record
FUNCTION: VIDEO
attenuator
set
MAIN board 
MD(VIDEO) IN jack (J701)
L-CH, R-CH
1) 315 Hz
2) 10 kHz
50 mV (– 23.8 dB)



600 
Ω
blank tape
CS-123
AF OSC
2. Mode: Playback
+
–
set
recorded
portion
MAIN board
CN301 pin 
1
 (L-CH)
            pin 
3
 (R-CH)
level meter
3. Confirm playback the signal recorded in step 1 become speci-
fication values as follows.
If these values are out of specification values, adjust the RV321
(L-CH) and RV322 (R-CH) on the MAIN board to repeat
steps 1and 2.

Adjustment level: The playback output of 10kHz level difference
      against 315 Hz reference should ±0.5 dB.

Adjustment Location: MAIN board
REC Level Adjustment     DECK B

Procedure:
1. Mode: Record
FUNCTION: VIDEO
set
MAIN board
MD (VIDEO) IN jack (J701)
L-CH, R-CH
315 Hz, 50 mV (– 23.8 dB)
blank tape
CS-123
600 
Ω
attenuator
AF OSC
2. Mode: Playback
+
–
set
recorded
portion
MAIN board
CN301 pin 
1
 (L-CH)
            pin 
3
 (R-CH)
level meter
3. Confirm playback the signal recorded in step 1 become speci-
fication values as follows.
If these values are out of specification values, adjust the RV351
(L-CH) and RV301 (R-CH) on the MAIN board to repeat steps
1 and 2.

Specification values:
CN301 playback level: 47.2 to 53.0 mV (– 24.3 to – 23.3 dB)

Adjustment Location: MAIN board
– MAIN BOARD (Component Side) –
1
19
1
15
CN431
CN371
1
3
IN
OUT
MD (VIDEO)
CN301
IC301
IC501
RV321
REC BIAS
(L-CH)
RV351
REC LEVEL
(L-CH)
RV301
REC LEVEL
(R-CH)
RV391
TAPE SPEED
(NORMAL)
RV392
TAPE SPEED
(HIGH)
RV322
REC BIAS
(R-CH)

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