Read Sony HTC-V5550 / MHC-V5550 / MHC-V7770AV Service Manual online
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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.
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.
parts adjusted.
Adjustment Location: Playback Head (Deck A)
Record/Playback/Erase Head (Deck B)
L-CH
peak
peak
R-CH
peak
peak
screw
position
position
output
level
level
within
1 dB
1 dB
L-CH
peak
peak
R-CH
peak
peak
screw
position
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.
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.
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”.
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.
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.
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)
(test tape: WS-48B)
Playback Level Adjustment (Deck A, Deck B)
Procedure:
Mode: Playback
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.
(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
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]
[LEAF SW BOARD]
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