Sony ICF-CD820 - Cd/am/fm Stereo Clock Radio, Service Manual

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LASER DIODE AND FOCUS SEARCH
OPERATION CHECK
1. Open the CD lid.
2. Turn on S420 as following figure.
3. Confirm that the laser diode emission while observing the ob-
jecting lens. When there is no emission, Auto Power Control
circuit or Optical Pick-up is broken.
Objective lens moves up and down once for the focus search.
SECTION 2
GENERAL
This section is extracted from
instruction manual.
Insert a precision
screwdriver and
push S420.
laser diode
emission