Sony HCD-XGR90AV Service Manual page 18

HCD-XGR90AV
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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 board
P-4-A100
MD (VIDEO) OUT jack (J701)
(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
TE peak
L 13942296513
3. Mode: Playback
MAIN board
MD (VIDEO) OUT jack (J701)
test tape
L-CH
P-4-A100
(10 kHz, – 10 dB)
L-CH
set
R-CH
R-CH
waveform of oscilloscope
in phase 45 °
good
4. Repeat step 1 to 3 in playback (REV) mode.
5. After the adjustments, apply suitable locking compound to the
pats adjusted.
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level meter
+
within
1dB
Screw
position
R-CH
peak
oscilloscope
V H
90 ° 135 ° 180 °
wrong
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Adjustment Location: Playback Head (Deck A).
forward
Tape Speed Adjustment
Mode: Playback
test tape
WS-48B
(3 kHz, 0 dB)
set
MAIN board
MD (VIDEO) OUT jack (J701)
L-CH, R-CH
1. Insert the WS-48B into the deck B.
Q Q
2. Press the H button on the deck B.
3 6 7 1 3
3. Press the H SPEED DUB button in playback mode.
Then at HIGH speed mode.
4. Adjust RV392 on the LEAF SW board do that frequency
counter reads 6,000 ± 180 Hz.
5. Press the H SPEED DUB button.
Then back to NORMAL speed mode.
6. Adjust RV391 on the LEAF SW board so that frequency
counter reads 3,000 ± 90 Hz.
Adjustment Location: MAIN board
Sample value of Wow and Flutter: 0.3% or less W.RMS (JIS)
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Record/Playback/Erase Head (Deck B).
reverse
DECK B
frequency counter
+
–
1 5 0 5 8 2 9 9 4
(WS-48B)
m
co
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2 8 9 9