Sony HCD-VM330AV Service Manual page 16

HCD-VM330AV
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Record/Playback Head Azimuth Adjustment
DECK A DECK B
Note: Perform this adjustments for both decks
Procedure:
1. Mode: Playback (FWD)
test tape
MAIN AMP board
P-4-A100
FRONT SPEAKER terminal (J501)
(10 kHz, – 10 dB)
L-CH, R-CH
set
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 1dB of peak.
within
L-CH
1dB
peak
Output
level
R-CH
peak
Screw
position
L-CH
peak
TE
L 13942296513
3. Mode: Playback
MAIN AMP board
FRONT SPEAKER terminal (J501)
test tape
L-CH
P-4-A100
(10 kHz, – 10 dB)
L-CH
set
R-CH
R-CH
waveform of oscilloscope
in phase 45 ° 90 ° 135 ° 180 °
good
4. Repeat step 1 to 3 in playback (REV) mode.
5. After the adjustments, apply suitable locking compound to the
parts adjusted.
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level meter
+
–
within
1dB
Screw
position
R-CH
peak
oscilloscope
V H
wrong
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Adjustment Location: Playback Head (Deck A).
Record/Playback/Erase Head (Deck B).
forward
reverse
DECK B
Tape Speed Check
Mode: Playback
test tape
WS-48A
(3 kHz, 0 dB)
set
Q Q
3 6 7 1 3 1 5
MAIN AMP board
FRONT SPEAKER terminal (J501)
L-CH, R-CH
1. Insert the WS-48A into the deck B.
2. Press the nN button on the deck B.
3. Confirm that the frequency counter reads 3,000 ± 60 Hz.
Sample value of Wow and Flutter: 0.3% or less W.RMS (JIS)
co
.
9 4 2 8
frequency counter
+
–
0 5 8 2 9 9 4 2 8
(WS-48A)
m
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