HTC-V5550, MHC-V5550, MHC-V7770AV - Sony Audio Service Manual (repair manual). Page 12

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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.
3.
Mode: Playback
4.
After the adjustments, apply suitable locking compound to the
parts adjusted.
Adjustment Location: Playback Head (Deck A)
Record/Playback/Erase Head (Deck B)
L-CH
peak
R-CH
peak
screw
position
output
level
within
1 dB
L-CH
peak
R-CH
peak
screw
position
within 1dB
Waveform of oscilloscope
in phase
45
°
90
°
135
°
180
°
good
wrong
set
PFJ-1
oscilloscope
test tape
P-4-A100
(10kHz, -10dB)
output point
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-DUB  button is pressed.
Procedure:
Press the  p (CD)  button while pressing the  DIRECTION MODE
button.
1.
Insert the WS-48B into deck B, while pressing the  p (CD)
button, press the  ª (TAPE A)  button, set the function to
“deck B”.
2.
Press the    ·  button of deck B.
3.
Press the  HI-DUB  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-DUB  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
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
Foward
Reverse
set
test tape
P-4-L300
(315Hz, 0dB)
PFJ-1
level meter
output point
RV1002
RV1001
RV1002(Normal Speed)
RV1001(High Speed)
Adjustment Location
[LEAF SW BOARD]
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