Read Sony HCD-LV60 / LBT-LV60KR Service Manual online
14
REC Bias Adjustment
DECK B
Procedure:
1. Mode: Record
1. Mode: Record
FUNCTION: VIDEO
2. Mode: Playback
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 RV341
(L-CH) and RV441 (R-CH) on the AUDIO board to repeat
steps 1and 2.
If these values are out of specification values, adjust the RV341
(L-CH) and RV441 (R-CH) on the AUDIO board to repeat
steps 1and 2.
Specification values: Playback output of 315 Hz to playback
output of 10 kHz: ± 0.5 dB
Adjustment Location: AUDIO board
REC Level Adjustment
DECK B
Procedure:
1. Mode: Record
1. Mode: Record
FUNCTION: VIDEO
2. Mode: Playback
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 RV301
(L-CH) and RV351 (R-CH) on the MAIN board to repeat steps
1 and 2.
If these values are out of specification values, adjust the RV301
(L-CH) and RV351 (R-CH) on the MAIN board to repeat steps
1 and 2.
Specification values:
J101 PB level: 47.2 to 53.0 mV (– 24.3 to – 23.3 dB)
J101 PB level: 47.2 to 53.0 mV (– 24.3 to – 23.3 dB)
Adjustment Location: MAIN board
attenuator
set
MAIN board
VIDEO 1 AUDIO IN jack (J701)
L-CH, R-CH
VIDEO 1 AUDIO IN jack (J701)
L-CH, R-CH
1) 315 Hz
2) 10 kHz
2) 10 kHz
50 mV (– 23.8 dB)
600
Ω
blank tape
CN-123
CN-123
AF OSC
+
–
–
set
recorded
portion
portion
MAIN board
MD OUT jack (J701)
L-CH, R-CH
MD OUT jack (J701)
L-CH, R-CH
level meter
set
MAIN board
VIDEO 1 AUDIO IN jack (J701)
L-CH, R-CH
315 Hz, 50 mV (– 23.8 dB)
VIDEO 1 AUDIO IN jack (J701)
L-CH, R-CH
315 Hz, 50 mV (– 23.8 dB)
blank tape
CS-123
CS-123
600
Ω
attenuator
AF OSC
+
–
–
set
recorded
portion
portion
MAIN board
MD OUT jack (J701)
L-CH, R-CH
MD OUT jack (J701)
L-CH, R-CH
level meter
RV401
RV301
RV341
RV311
RV411
IC602
CN601
L
R
R L
RV441
PB LEVEL
– DECK B –
REC BIAS
L
R
PB LEVEL
– DECK A –
– AUDIO BOARD (Component Side) –
TAPE SPEED
RV1002
RV1001
(NORMAL) (HIGH)
CN1001
– LEAF SW BOARD (Component Side) –
MD OUT
L/R
IC301
REC LEVEL
RV301
L-CH
RV351
R-CH
VIDEO 1
AUDIO IN
L/R
J701
– MAIN BOARD (Conductor Side) –
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