Sony HCD-VZ30AV Service Manual page 21

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Record Bias Adjustment (Deck B)
Procedure:
INTRODUCTION
When set to the test mode performed in Tape Speed Adjustment,
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.
(After recording, press the
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
button, and then press the H button to start recording.
3. Mode: Record
4. Mode: Playback
AF OSC
Attenuator
5. Confirm playback the signal recorded in step 2 become
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adjustment level as follows.
Recorded
portion
Set
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
Adjustment Location:
[AUDIO BOARD] (Conductor Side)
RV341(Lch),RV441(Rch)
Record Bias
RV301 RV401
www
RV441 RV341
RV301(Lch),RV401(Rch)
.
Playback Level (Deck B)
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m button without stopping will
REC PAUSE/START
VIDEO (AUDIO) IN
1) 315 Hz
} 50 mV (–23.8 dB)
2) 10 kHz
Blank tape
600 Ω
CS-123
Set
Level meter
+
–
MAIN board CN301C (Pin 1 : L-CH)
(Pin 3 : R-CH)
RV311(Lch),RV411(Rch)
Playback Level (Deck A)
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y
i
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8
Record Level Adjustment (Deck B)
Procedure:
INTRODUCTION
When set to the test mode performed in Tape Speed Adjustment,
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.
(After recording, press the
return to the position where recording was started.)
1. Press FUNCTION button to select VIDEO 1. (This step is
not necessary if the above test mode has already been set.)
2. Insert a tape into deck B, press the REC PAUSE/START
button, and then press the H button to start recording.
3. Mode: Record
4. Mode: Playback
AF OSC
Q Q
5. Confirm playback the signal recorded in step 2 become
3 6 7 1 3
adjustment level as follows.
Recorded
portion
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
[MAIN BOARD] (Conductor Side)
CN301
RV411
RV311
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.
2 9 9 4 2 8
m button without stopping will
VIDEO (AUDIO) IN
315Hz 50 mV (–23.8 dB)
600 Ω
Attenuator
Set
1 5 0 5 8 2 9 9 4
Level meter
+
Set
–
MAIN board CN301C (Pin 1 : L-CH)
(Pin 3 : R-CH)
3 1
RV301
Record level (L ch)
IC301
RV351
m
Record level (R ch)
co
9 9
Blank tape
CS-123
2 8 9 9
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