Read Sony CMT-ED1 / HCD-ED1 / HCD-ED1A Service Manual online
– 9 –
2. Turn the adjustment scre
w and c hec k output peaks.
If the peaks
do not matc h for L-CH and R-CH, turn the adjustment scre
w so
that outputs match within 1 dB of peak.
4. After the adjustments, apply suitable locking compound to the
parts adjusted.
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Tape Speed Adjustment
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Mode : Playback
3. Mode : Playback
1. Inser t the WS-48B into the dec
k, and pla ybac k.
2. Adjust the VR770/RELA Y boar d so that the frequenc
y counter
reading becomes 3000
±
90 Hz.
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RELAY boar d
Sample Value of Wow and flutter
W.RMS (JIS) less than 0.3%
(test tape: WS-48B)
(test tape: WS-48B)
Playback Level Adjustment
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Mode : Playback
oscilloscope
MD OUT (JK301)
set
MD OUT (JK301)
test tape
P-4-A100
(10kHz, –10dB)
P-4-A100
(10kHz, –10dB)
L
R
Waveform of oscilloscope
good
wrong
in phase
45
°
90
°
135
°
180
°
L-CH
peak
peak
R-CH
peak
peak
screw
position
position
output
level
level
within
1dB
1dB
L-CH
peak
peak
R-CH
peak
peak
screw
position
position
within 1dB
+
–
–
MD OUT (JK301)
set
frequency counter
test tape
WS-48B
(3kHz, 0dB)
WS-48B
(3kHz, 0dB)
FWD side
REV side
Adjustment screw
level meter
MD OUT (JK301)
set
test tape
P-4-L300
(315Hz, 0dB)
P-4-L300
(315Hz, 0dB)
Dec k is VR703 (L-CH) and VR704 (R-CH)
so that adjustment within the f
so that adjustment within the f
ollo wing adjustment le
vel.
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Pla ybac k le vel: 301.5 to 338.3 mV (–8.2 to –7.2 dB)
level dif-
ference between the channels: within
±
0.5 dB
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TAPE PREAMP boar d
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