Tape Speed Adjustment; Playback Level Adjustment - Sony HCD-ED1 Service Manual

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
1dB
R-CH
peak
screw
position
3. Mode : Playback
test tape
P-4-A100
(10kHz, –10dB)
set
Waveform of oscilloscope
in phase
45
good
4. After the adjustments, apply suitable locking compound to the
parts adjusted.
Adjustment Location :
FWD side
Adjustment screw
within 1dB
screw
L-CH R-CH
position
peak peak
MD OUT (JK301)
oscilloscope
L
R
MD OUT (JK301)
90 135 180
wrong
REV side

Tape Speed Adjustment

Procedure :
Mode : Playback
test tape
WS-48B
(3kHz, 0dB)
set
1. Insert the WS-48B into the deck, and playback.
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)

Playback Level Adjustment

Procedure :
Mode : Playback
test tape
P-4-L300
(315Hz, 0dB)
set
Deck is VR703 (L-CH) and VR704 (R-CH)
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
Adjustment Location : TAPE PREAMP board
– 9 –
frequency counter
+
–
MD OUT (JK301)
level meter
MD OUT (JK301)