Sony HCD-LX9AV Service Manual page 17

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 1. (This step is
not necessary if the above test mode has already been set.)
2. Insert a tape into deck B, press the
then press the H button to start recording.
3. Mode: Record
4. Mode: Playback
VIDEO 1 (AUDIO) IN
1) 315 Hz
2) 10 kHz
AF OSC
600 Ω
attenuator
5. Confirm playback the signal recorded in step 2 become
adjustment level as follows.
recorded
position
set
MD OUT
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
RV441 RV341
RV301(Lch),RV401(Rch)
Playback Level (Deck B)
m button without stopping will
z REC
button, and
} 50 mV (–23.8 dB)
blank tape
CS-123
set
level meter
RV311(Lch),RV411(Rch)
Playback Level (Deck A)
RV311
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
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
adjustment level as follows.
recorded
position
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)
RV411
1
3
14
1
IC301 56
43 42
RV351
Record Level (Rch)
m button without stopping will
z REC
VIDEO 1 (AUDIO) IN
315Hz 50 mV (–23.8 dB)
600 Ω
set
set
MD OUT
Record Level (Lch)
RV301
15
28
29
button, and
blank tape
CS-123
level meter
17