Sanyo MCD-Z250F, Service Manual

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REPLACEMENT OF CD MECHANISM
f. Resetting the pickup to the home position
(1) The limit switch is switched ON by the projection of this rack
gear secured to the returned pickup, after which the sled motor
continues to operate (by the circuit) for approximately 30 msec.
There is then again a reverse operation, and movement to
the position at which the switch is switched OFF.
(2) Rotation continues during about 30 msec, after the switch is
switched OFF. And then the pickup stops at home position.
CONFIRM OF CD SECTION
a. Preparation
l
Measuring instruments and Test disc.
(1) Test Disc YEDS 18 (SONY)
(2) Oscilloscope (10 MHz and Dual Phenomenon)
NOTE : CD section of this unit can not need adjustment, because CD P.W.Board checked at automatic checker.
b. Confirm of general operation
(1) Set the test disc.
(2) Press the PLAY button, then confirm the disc rotating to clockwise direction.
(3) Press the SKIP/SEARCH button, then confirm the most inner music or most outer music accessing at speedy.
(4) Press the STOP button.
c. Confirm of eye pattern
(1) Connect an oscilloscope to pin41 (H)) and VR
(J1315).
(2) Set the test disc, press the PLAY button.
(3) Check to be sure that the “eye” pattern is at of waveform
and that the diamond shape is clearly defined.
(4) Press the STOP button.
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