Sony HTC-WX5 Service Manual page 12

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.
L-CH
output
peak
within
level
1 dB
R-CH
peak
screw
position
3. Mode: Playback
test tape
P-4-A100
(10kHz, -10dB)
set
Waveform of oscilloscope
45 °
in phase
good
4. After the adjustments, apply suitable locking compound to the
parts adjusted.
Adjustment Location: Playback Head (Deck A)
Record/Playback/Erase Head (Deck B)
Reverse
Forward
12
within 1dB
screw
L-CH R-CH
position
peak peak
output point
oscilloscope
PFJ-1
90 ° 135 ° 180 °
wrong
Tape Speed Adjustment (Deck B)
Note: Set the test mode using the following method and begin tape
speed adjustment.
In the test mode, the speed will switch to double speed or
normal speed each time the HI-SPEED DUBBING button
is pressed.
Procedure:
Press the p (CD) button while pressing the DIRECTION MODE
button.
Insert the WS-48B into deck B, while pressing the p (CD)
1.
button, press the ª (TAPE A) button, set the function to
"deck B".
Press the · button of deck B.
2.
3. Press the HI-SPEED DUBBING button and play the tape at
double speed.
4. Adjust RV1001 of the LEAF SW board so that the reading of
the frequency counter becomes 6000 ± 180 Hz.
5. Press the HI-SPEED DUBBING button and play the tape at
normal speed.
6. Adjust RV1002 of the LEAF SW board so that the reading of
the frequency counter becomes 3000 ± 90 Hz.
Adjustment Location: LEAF SW board
Sample Value of Wow and flutter
W.RMS (JIS) less than 0.3%
(test tape: WS-48B)
Playback Level Adjustment (Deck A, Deck B)
Procedure:
Mode: Playback
test tape
P-4-L300
(315Hz, 0dB)
set
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:
Output point from PFJ-1 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
Adjustment Location
[LEAF SW BOARD]
RV1001(High Speed)
RV1002(Normal Speed)
RV1002 RV1001
level meter
PFJ-1
output point