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he
CDP-502ES/620ES
— CAUTION
FOR
ELECTROSTATIC
BREAKDOWN —
NOTES
ON
HANDLING
THE OPTICAL
PICK-UP
BLOCK (BU-1)
The laser diode in the optical pick-up block may
1. Place a conductive sheet on the workbench.
suffer electrostatic breakdown because of the poten-
(The black sheet used as repair parts wrapping).
tial difference generated by the charged electrostatic
4. Place the set on the conductive sheet so that the
load, etc. on clothing and the human body.
The printed matter below is included in the repair
parts.
During repair, use the procedure in the printed
chassis touches the sheet.
(This makes it the same
potential as the conductive sheet).
3. Place your hands on the conductive sheet.
(This
matter.
The following method is an example for reference
makes them the same potential as the sheet).
purposes:
4. Remove the optical pick-up block.
5. Perfrom work on top of the conductive sheet.
Be
careful that clothing does not touch the optical
pick-up block.
Printed Matter Included in the Repair Parts
When opening or repairing a BU-1, the procedure for grounding as follows is required to prevent damage caused
by static electricity.
1. Grounding for the human body.
Be sure to put on a wrist-strap for grounding (with impedance lower than 10°) whose other end is grounded
The strap works to drain away the static electricity built-up on the human body.
. Grounding for the work table.
Be sure to lay on the table a cunductive sheet (with impedance lower than 10°) such as sheet of copper
which is grounded.
. As static electricity built-up on clothes is not drained away, be careful not to let your clothes touch the BU-1.
@) Wrist-strap
for grounding
transit protective cap
The unit
BU-1
@) Conductive sheet
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