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Sony DVP-NS300 Training Manual Page 43

Circuit descriptions & troubleshooting.
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Clamping Motor Rotary Encoder 2 Alignment
Concept: Rotary encoder 2 (S701) sets the clamping motor limits. Since these gears also control the rear disc
rollers, an encoder 2 misalignment can cause the disc not to travel to the rear stacker or grab the disc during PB
(no spinning).
Procedure: Figure 8-11 (mechanism bottom) shows that the Clamping motor gears are rotated until cam BU U/
D is turned fully counter-clockwise. Place the rotary encoder gear (S701) so its mark faces the plastic projection
in the chassis as shown.
Test: Rotate the clamping motor. At one mechanical limit (unloaded as shown in Figure 8-11), the disc is unclamped.
At the other limit, the disc is clamped. In-between these limits, SW716 and SW717 (Figure 8-4) close freeing the
rear rollers.
FIGURE 8-11 - ROTARY ENCODER 2 - FOR CLAMPING / STACKER LOADING
Disc to Stacker Gear Alignment
Concept: The clamping motor not only clamps and unclamps the disc, it also drives gears to position the rear
rollers that move the disc into (and from) the stacker.
Procedure: As in Figure 8-12, rotate the clamping motor so the cam BU U/D is CCW (disc clamped). Install the
Cam gear mark as shown. Then as in Figure 8-13, rotate the clamping motor so the cam BU U/D is CW (disc
unclamped). Slide the shaft up. Drop the mode cam gear in mark as shown in Figure 8-13 and secure.
Test: Rotate the clamping motor. At one mechanical limit, the mechanism will clamp the disc and in the other, the
rollers hold the disc. In-between these limits, SW716 and SW717 (Figure 8-4) should close freeing the rear
rollers. See Figures 8-14 and 8-15 for the position of the clamping motor gears in the two extremes.
FIGURE 8-12 - DISC TO STACKER GEAR ALIGNMENT 1 (DISC CLAMPED)
Encoder 2
Clamping / Stacker
loading
41
8. Mechanical Operation
Figure 12-11 - Rotary
Encoder 2
- for
Clamping / Stacker
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