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DW - S114X
5.3 Adjustments
1. VCO Free-run Frequency Adjustment
@ Objective
To optimize the VCO free-run frequency.
@ Symptom when out of | No play.
adjustment
@Measurementinstru-
| Connect the frequency counter | @Player state
Stop
ment connections
and TP202 (CN609), pin 3
(just the power switch ON)
(EPLCK)
@ Adjustment location
| L603 (VCO. ADJ)
[Settings]
@ Disc
None needed
[Procedure]
1. Adjust L603 so that the VCO oscillation frequency at TP202 (CN609), pin 3 (EPLCK) is 4.322MHz + 0.00.2MHz.
2. Slider Speed Control Offset Adjustment
@ Objective
To optimize the DC offset voltage of the slider speed control amp.
@ Symptom when out of | Player does not playback (slider moves at stop).
adjustment
@ Measurement instru- | Connect the oscilloscope to
@ Player state
ment connections
TP1(CN103), Pin 7
(SLDDRY).
GND : TP! (CN103), Pin 5
(AGND)
{This connection may be via a
low-pass filter (39k Q
+1000pF)}
@ Adjustment location
| VR101 (SLD. OFS)
[Settings]
5 mV/division
None needed
5 ms/division
DC mode
[Procedure]
1. Move the pickup to midway across the disc.
2. If the pickup continues moving even when you try to stop it, coarse adjust VR1O1 (SLD.OFS) to stop it.
3. Adjust VRIO1 (SLD.OFS) so that the DC voltage at TP] (CN103), pin 7 (SLDDRV) is 0 + 10 mV.
4. Check that pickup movement is stopped.
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