Sony CDP-CX235 Training Manual page 7

Introduction
This training manual is based upon the model CDP-CX235 CD Changer.
This model is the entry changer in the "Mega" Changer product line for
the year 2000. The "2" in the model number refers to the 200 disc capac-
ity of these Changers. These 200 series models are mechanically com-
plex so there are more CD transport and mechanical adjustments to be
made.
The concepts and circuitry in this 200 disc model are similar to the 300
disc CDP-CX300 series and 400 disc CDP-CX400 series CD Changers.
In these larger capacity models, the CD transport and CD mechanism
use fewer parts. As a result, the higher capacity Changers require fewer
adjustments.
Generally, the electrical troubleshooting procedures and test modes out-
lined in this training manual can be applied to all of the changer models
listed for the last three years. This is because for troubleshooting pur-
poses, they are electrically similar. Mechanically, the 200 disc Changers
use one basic chassis and the 300 and 400 disc Changers use another
chassis so the mechanical adjustments differ.
Model CDP-CX90ES/CDPCX-270
The model CDP-CX90ES/CDPCX-270 was carried over from the 1998
year because it was the only chassis that had the following major fea-
tures:
•
A video output for an on-screen display using a TV.
•
A front panel jack that permitted a computer keyboard to be plugged
in. This allowed the user to label or re-label each CD slot location
quickly using the keyboard instead of the slower remote control
Model CDP-CX235
The board layout of the CDP-CX235 is shown. The bulk of the electronics
are on the rear main board. To its left in the vacant area is the CD mecha-
nism housing the optical assembly and servo (BD) board. The small boards
along the bottom of the chassis hold the tray table and disc sensors. The
top illumination board houses 3 LEDs to light the disc compartment when
the CD Changer is powered on.
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