Advertisement
DW - S$114X
6. Main and Sub Mix Ratio Adjustment
To mix the gain of the main signal output and sub signal output of the pickup.
@ Objective
@ Symptom when out of
adjustment
@ Measurement instru-
ment connections
[Procedure]
Player does not playback.
Connect the oscilloscope to
CH1 : TP2 (CN104), Pin 1
(STE)
CH2 : TP2 (CN104), Pin 2
(MSTE).
[This connection may be via a
@ Adjustment location
L.P.F. (39k Q +1000pF). ]
[Settings]
CH | : 5 mV/div. AC mode
1 ms/div. ADD mode
CH 2: 10 mV/div.
AC mode
(Match the GND level of CH1
and CH2.)
Spindle rotation frequency : Normal
speed, focus ON, spindle ON/
tracking OFF
VR3 (MS. MIX)
1. Spindle rotation frequency : Normal speed, focus ON and spindle ON to move the pickup to midway across the disc.
2. Set the oscilloscope to ADD mode (waveform adding mode of CHI and CH2) and observe the adding waveform of
CHI and CH2.
3. Adjust VR3 (MS. MIX) so that the amplitude of waveform becomes minimum.
46
Out of adjustment
Optimum adjustment
Advertisement
