Sony CFD-Z125 - Cd Radio Cassette-corder, Service Manual

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SECTION 1
SERVICE NOTES
NOTES ON HANDLING THE OPTICAL PICK-UP
BLOCK OR BASE UNIT
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.
NOTES ON LASER DIODE EMISSION CHECK
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,
observe from more than 30 cm away from the objective lens.
CHUCK PLATE JIG ON REPAIRING
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
LASER DIODE AND FOCUS SEARCH OPERATION
CHECK
1. Turn POWER switch on with no disc inserted and make Function
switch to CD position.
2. Open the lid for CD.
3. Turn on S702 as following figure.
4. Press the
fl
button.
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.
HOW TO CHANGE THE FM CERAMIC FILTERS
This model uses the two ceramic filters of CF1 and CF4.
You must use the same type of color marked ceramic filters in order
to meet same specifications.
Therefore, the ceramic filter must change two pieces together since
it’s supply two pieces in one package as a spare parts.
Mark 1 Mark 2
Center
frequency
red — 10.70MHz
blue — 10.67MHz
orange — 10.73MHz
black — 10.64MHz
white — 10.76MHz
white white 10.75MHz
yellow — 10.79MHz
mark 1 mark 2
CF1,4
S702