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Mechanical Adjustments
®@ Measuring equipment
and tools
@ Measurement point
® Test disc and set
@ Adjustment point
® Oscilloscope
e L.P.F.
e SRVB assembly
¢ TRKG servo open
© CD spindle motor
Angular
screwdriver |
en
SRVB assembly
Connection diagram
' Adjustment procedure
1.
AC mode.
motor pedestal.
e YEDS-7 CD test disc
¢ CN102-1 (TRKG error)
e Play the CD test disc
e Angular Screwdriver I (GGV-129)
e CN103-6 (tracking sum)
—
Oscilloscope
X:20mV/div
Y:10mV/div
AC mode
Minimum amplitude of the
lissajous wave in the Y direction
. Insert Angular Screwdriver I in the hole for adjusting
the centering of the CD motor axis as shown in Figure
above (left) Turn Angular Screwdriver I to the point
that gives the maximum amplitude of the Lissajous
wave in the Y direction.
Note: If the Lissajous wave is not clear, connect L.P.F.'s
between the X and Y terminals of the oscilloscope
and the measuring points as shown in the figure
above.
. Close the tracking servo loop, find Track #23, then
open the tracking servo loop again. Double check that
there is no significant change in the Lissajous wave.
. Close the tracking servo loop.
. Press the Eject key on the remote control once and
lay the player flat. Press the Eject key again and
remove the disc.
. Tighten the screws securing the CD spindle motor.
73
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