CFD-503, CFD-505 - Sony Audio Service Manual (repair manual). Page 3

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1. Turn POWER switch on with no disc inserted and make Func-

tion switch to CD position.

2. Open the lid for CD.
3. Turn on S807 as following figure.
4. Press 

· key.

5. Confirm the laser diode emission while observing the objecting

lens. When there is no emission, Auto Power Control circuit or
Optical Pick-up is broken.
Objective lens moves up and down three times for the focus
search.

The laser diode in the optical pick-up block may suffer electrostatic
breakdown because of the potential difference generated by the
charged electrostatic load, etc. on clothing and the human body.
During repair, pay attention to electrostatic breakdown and also use
the procedure in the printed matter which is included in the repair
parts.
The flexible board is easily damaged and should be handled with
care.

The laser beam on this model is concentrated so as to be focused on
the disc reflective surface by the objective lens in the optical pick-
up block.  Therefore, when checking the laser diode emission, ob-
serve from more than 30 cm away from the objective lens.

On repairing CD section, playing a disc without the CD lid, use
Chuck Plate Jig.
• Code number of Chuck Plate Jig: X-4918-255-1

S807