Sony HCD-DR7AV Service Manual page 17

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Record Bias Adjustment (Deck B)
Procedure:
INTRODUCTION
When set to the test mode performed in Tape Speed Adjust-
ment, 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.
(After recording, press the 0 button without stopping will re-
turn 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 r REC button, and then
press the · button to start recording.
3. Mode: Record
AF OSC
attenuator
4. Mode: Playback
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 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
Adjustment Location: AUDIO board
Adjustment Location:
[AUDIO BOARD] (Conductor Side)
RV341(Lch),RV441(Rch)
Record Bias
RV301 RV401
RV441 RV341
RV301(Lch),RV401(Rch)
Playback Level (Deck B)
VIDEO 1 (AUDIO) IN
1) 315 Hz
} 50 mV (–23.8 dB)
2) 10 kHz
600 Ω
set
level meter
set
MD OUT
against 315 Hz reference should be ± 1.0 dB.
18/2/2013
Record Level Adjustment (Deck B)
Procedure:
INTRODUCTION
When set to the test mode performed in Tape Speed Adjust-
ment, 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 1.
(After recording, press the 0 button without stopping will re-
turn 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 r REC button, and then
press the · button to start recording.
3. Mode: Record
AF OSC
blank tape
CS-123
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
[MAIN BOARD] (Conductor Side)
RV311(Lch),RV411(Rch)
Playback Level (Deck A)
RV411
RV311
– 17 –
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VIDEO 1 (AUDIO) IN
315Hz 50 mV (–23.8 dB)
600 Ω
attenuator
set
recorded
position
set
MD OUT
Record Level (Lch)
RV301
1
3
14
15
28
1
IC301 56
29
43 42
RV351
Record Level (Rch)
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blank tape
CS-123
level meter