Sony HCD-XB66 Service Manual page 18

1. Mode: Playback (FWD)
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
1dB
L-CH
peak
output
level
R-CH
peak
Screw
position
3. Mode: Playback (FWD)
test tape
P-4-A100
(10 kHz, –10 dB)
pin 3
L-CH
main
L
board
CN207
R
set
R-CH
pin 1
waveform of oscilloscope
in phase 45 ° 90 ° 135 ° 180 °
good
4. Repeat steps 1 to 3 in playback (REV) mode.
5. After the adjustments, apply suitable locking compound to the
pats adjusted.
Adjustment Location: Record/Playback Head (Deck A and B)
and MAIN board.
forward
within
1dB
Screw
position
L-CH
R-CH
peak peak
oscilloscope
pin 2
V H
wrong
reverse
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
[H. SPEED DUBB]
Procedure:
1. Turn the power switch on.
[SPECTRUM ANALYZER]
2. Press the
[EFFECT]
ton and
To exit from the test mode, press the
Mode: Playback (FWD)
test tape
WS-48B
(3 kHz, 0 dB)
1. Insert the WS-48B into the deck A and the blank tape into the
deck B.
[REC]
button and · button on the deck B. Then
2. Press the
the deck B is at recording mode.
3. Set the deck A to playback mode.
4. Keep pressing the
Then at HIGH speed mode.
5. Adjust RV652 on the AUDIO board do that frequency counter
reads 6,000 ± 60 Hz.
[H. SPEED DUBB]
6. Take off the
Then at NORMAL speed mode.
7. Adjust RV651 on the AUDIO board so that frequency counter
reads 3,000 ± 20 Hz.
8. Frequency difference between deck A and deck B the begin-
ning of the tape should be within ± 1.5%.
Adjustment Location: AUDIO and MAIN boards
Sample Value of Wow and flutter: 0.29% or less W. RMS
Playback level Adjustment
Procedure:
Mode: Playback (FWD)
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:
CN207 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 and MAIN boards
– 18 –
DECK A
button.
button,
button simultaneously.
I /u button.
frequency counter
+
set
–
MAIN board
CN207 (Pin 3 : L-CH)
(Pin 1 :R-CH)
[H. SPEED DUBB]
button in playback mode.
button.
(WS-48B)
DECK A
level meter
+
set
–
main board
CN207 (Pin 3 : L-CH)
(Pin 1 : R-CH)
[ENTER]
but-
DECK B