Read Sony HCD-V909AV / MHC-V909AV Service Manual online
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4. After the adjustments, apply suitable locking compound to the
parts adjusted.
Adjustment Location: Playback Head (Deck A)
Record/Playback/Erase Head (Deck B)
2. Turn the adjustment screw and check output peaks. If the peaks
do not match for L-CH and R-CH, turn the adjustment screw so
that outputs match within 1 dB of peak.
that outputs match within 1 dB of peak.
3. Mode: Playback
Tape Speed Adjustment (Deck A)
Note: Set the test mode using the following method and begin tape
speed adjustment.
In the test mode, the tape will move at double speed while
the HIGH SPEED DUBBING button is pressed.
In the test mode, the tape will move at double speed while
the HIGH SPEED DUBBING button is pressed.
Procedure :
With the power turned ON, press the NEXT button, ENTER/
NEXT button, and EFFECT ON/OFF button simultaneously.
(The “VOLUME” on the fluorescent display tube will blink while
in the test mode.)
To exit the test mode, press the POWER button.
With the power turned ON, press the NEXT button, ENTER/
NEXT button, and EFFECT ON/OFF button simultaneously.
(The “VOLUME” on the fluorescent display tube will blink while
in the test mode.)
To exit the test mode, press the POWER button.
1. Load WS-48B into deck A and a recordable tape into deck B.
2. Press the
2. Press the
r REC button, and press the · button of deck B to
set deck B into the recording state.
3. Play deck A.
4. While pressing the HIGH SPEED DUBBING button, set double
4. While pressing the HIGH SPEED DUBBING button, set double
speed play.
5. Adjust RV652 of the AUDIO board so that the reading of the
frequency counter becomes 6000 ± 90 Hz.
6. Release the HIGH SPEED DUBBING button to set normal
speed play.
7. Adjust RV651 of the AUDIO board so that the reading of the
frequency counter becomes 3000 ± 90 Hz.
Adjustment Location: AUDIO board
Sample Value of Wow and flutter
W.RMS (JIS) less than 0.3%
(test tape: WS-48B)
(test tape: WS-48B)
Playback Level Adjustment (Deck A, Deck B)
Procedure:
L-CH
peak
peak
R-CH
peak
peak
screw
position
position
output
level
level
within
1 dB
1 dB
L-CH
peak
peak
R-CH
peak
peak
screw
position
position
within 1dB
test tape
P-4-A100
(10kHz, –10dB)
P-4-A100
(10kHz, –10dB)
VIDEO/MD
(AUDIO) OUT
(AUDIO) OUT
oscilloscope
GND
set
L
R
Waveform of oscilloscope
in phase
45
°
90
°
135
°
180
°
good
wrong
reverse
forward
test tape
P-4-L300
(315Hz, 0dB)
P-4-L300
(315Hz, 0dB)
VIDEO/MD
(AUDIO) OUT
(AUDIO) OUT
level meter
set
Mode: Playback
Deck A is RV311 (L-CH) and RV411 (R-CH), deck B is RV301
(L-CH) and RV401 (R-CH)
so that adjustment within the following adjustment level.
Deck A is RV311 (L-CH) and RV411 (R-CH), deck B is RV301
(L-CH) and RV401 (R-CH)
so that adjustment within the following adjustment level.
Adjustment level:
J101 playback level: 301.5 to 338.3 mV (–8.2 to –7.2 dB)
level difference between the channels: within ± 0.5 dB
Adjustment Location: AUDIO board
J101 playback level: 301.5 to 338.3 mV (–8.2 to –7.2 dB)
level difference between the channels: within ± 0.5 dB
Adjustment Location: AUDIO board
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