REMGX
B225
SECTION 4/10
4.2.5 Adjusting the focus gain
-- Switch CD player off, remove SERVO 1 PCB 1.76 9.310
and reinsert it via the service PCB.
- Connect AF generator to the X input of an oscilloscope
and via an R-C-R element (according to Fig. 4.12)
to pin 6 of IC2 (on
1.769.310),
(f=600 Hz +5 Hz,
U=250 to 300 mV RMS).
- With trimmer potentiometer R58 (on player mechanism
PCB 1.769.100.35), align for minimum amplitude A
of the Lissajous figure.
t
,
2
.
6 Checking the angle alignment
Place the mirror on the focussing unit and mount
the optical system alignment disc (secure with adhesive
magnet) .
Place the player mechanism below? a light source that
produces a linear, straight shadow.
Bring the-laser scanner arm to its center position
and rotate the CD player in such a way that the arm
stands parallel to the line below? the light source
(refer to Fig.
4.13).
When the reflection on the glass disc and in the
mirror is viewed as illustrated in Fig. 4.13. The
distance between the two lines should not exceed 2.5 mm.
Position the CD player in such a way that the shadow
forms a 90° angle to the scanner arm (see Fig.
4.14).
The distance between the two lines (reflections)
should not exceed 2.5 mm.
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