Disc Loading Drive; Operation; Motor Stop - Sony CDP-CX235 Training Manual

Disc Loading Drive

The purpose of the Disc Loading Drive stage is to rotate a cam that moves
levers to:
•
Lock the tray table (after it has stopped)
•
Grasp the disc from the tray table
•
Guide the CD into the CD Mechanism
•
Clamp the CD onto the spindle motor shaft (chucking)
•
Release the CD when the cam reaches the end of travel.
Once the tray table has stopped, the Disc Loading Drive has the job of
getting the disc out of the tray table and placing it into the CD Mechanism
for play. From an electronic point of view, all that has to be done is to
rotate the Disc Loading Motor. The remainder is mechanical and is ad-
dressed in the overview and during alignment.

Operation

The electrical operation of this stage is similar to the Door Motor Drive.
After disc is placed on the tray table, Syscon IC501 positions the disc in
front of the CD Mechanism. The loading motor is powered to load the
disc into the CD Mechanism.
Loading Motor Drive Voltage
Cam Direction / IC501/pin 26
Function
CW / Chucking 3.1V
CCW / Unchucking 0V
IC501/pin 27 IC503/pin 3
0V 3.4V
3.1V -3.0V
27

Motor Stop

Just before the cam reaches the end of travel, it toggles the S801 switch
on the L. SW Board. The switch grounds IC501/pin 55 or 67 depending
upon the direction of rotation. A LOW voltage instructs IC501 to discon-
tinue the loading motor drive voltage. The loading motor stops.