Read Sony CMT-ED1 / HCD-ED1 / HCD-ED1A (serv.man2) Service Manual online
– 9 –
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.
that outputs match within 1 dB of peak.
4. After the adjustments, apply suitable locking compound to the
parts adjusted.
Adjustment Location :
Tape Speed Adjustment
Procedure :
Mode : Playback
Mode : Playback
3. Mode : Playback
1. Insert the WS-48B into the deck, and playback.
2. Adjust the VR770/RELAY board so that the frequency counter
2. Adjust the VR770/RELAY board so that the frequency counter
reading becomes 3000 ± 90 Hz.
Adjustment Location : RELAY 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
Procedure :
Mode : Playback
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)
Deck is VR703 (L-CH) and VR704 (R-CH)
so that adjustment within the following adjustment level.
so that adjustment within the following adjustment level.
Adjustment level :
Playback level: 301.5 to 338.3 mV (–8.2 to –7.2 dB) level dif-
ference between the channels: within ±0.5 dB
ference between the channels: within ±0.5 dB
Adjustment Location : TAPE PREAMP board
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