Sony HCD-VX3A Service Manual page 14

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.
L-CH
peak
Output
level
R-CH
peak
Screw
position
3. Mode: Playback
test tape
P-4-A100
(10 kHz, –10 dB)
L-CH
MAIN
board
CN301
set
R-CH
in phase 45 °
4. After the adjustments, apply suitable locking compound to the
pats adjusted.
Adjustment Location: Playback Head (Deck A).
forward
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within
1dB
within
1dB
L-CH R-CH
peak peak
oscilloscope
pin 3
pin 2
L
V H
R
pin 1
waveform of oscilloscope
90 ° 135 ° 180 °
wrong
good
Record/Playback/Erase Head (Deck B).
reverse
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Tape Speed Adjustment
Note: Start the Tape Speed adjustment as below after setting to the test
mode.
In the test mode, the tape speed is high during pressing the
HI-DUB
Procedure:
1. Turn the power switch on.
2. Press the p button, ENTER/NEXT button and DISC 3 button
simultaneously.
(The "VOLUME" on the fluorescent indicator tube will blink
while in the test mode.)
To exit from the test mode, press the 1/u button.
Mode: Playback
Screw test tape
position
WS-48B
(3 kHz, 0 dB)
1. Insert the WS-48B into the deck B.
2. Press the · button on the deck B.
3. Press the HI-DUB button in playback mode.
Then at HIGH speed mode.
4. Adjust RV1001 on the LEAF SW board do that frequency
counter reads 6,000 ± 180 Hz.
5. Press the HI-DUB button.
Then back to NORMAL speed mode.
6. Adjust RV1002 on the LEAF SW board so that frequency
counter reads 3,000 ± 90 Hz.
Adjustment Location: LEAF SW board
Playback level Adjustment
Procedure:
Mode: Playback
test tape
P-4-L300
(315 Hz, 0 dB)
Deck A is RV311 (L-CH) and RV411 (R-CH), Deck B is RV301
(L-CH) and RV401 (R-CH) so that adjustment within adjustment
level as follows.
Adjustment Level:
CN301 PB 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
Sample Volue of Wow and Flutter: 0.3% or less W. RMS
DECK B
button.
frequency counter
+
set
–
main board
CN301 (Pin 3 : L-CH)
(Pin 1 : R-CH)
DECK A DECK B
level meter
+
set
–
main board
CN301 (Pin 3 : L-CH)
(Pin 1 : R-CH)
(WS-48B)