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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.
Tape Speed Adjustment Procedure : Mode : Playback
test tape WS-48B (3kHz, 0dB)
frequency counter
L-CH peak
output level
within 1dB
set
within 1dB
+ � MD OUT (JK301)
screw position
R-CH peak screw position
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)
MD OUT (JK301)
L-CH peak R-CH peak
3. Mode : Playback
test tape P-4-A100 (10kHz, �10dB)
Playback Level Adjustment
oscilloscope
L set R
Procedure : Mode : Playback
test tape P-4-L300 (315Hz, 0dB) level meter
MD OUT (JK301)
set
Waveform of oscilloscope
MD OUT (JK301)
in phase
45 ° good
90 °
135 °
180 ° wrong
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 difference between the channels: within ±0.5 dB Adjustment Location : TAPE PREAMP board
4. After the adjustments, apply suitable locking compound to the parts adjusted. Adjustment Location :
FWD side Adjustment screw
REV side
MC-Service
�9�
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