Laser Beam Safety Precautions (Cd) - Sanyo DC Service Manual

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LASER BEAM SAFETY PRECAUTIONS (CD)
Do
not look straight at the laser beam from the pickup and do
Structural Safety Interlock
not point the beam at your fingers or any other
part of your
body.
This model has a disc chuck lever and top lid. This disc chuck
Note: The laser beam must never be
allowed to
enter the eyes
lever and top lid prevent to expose the laser beam for users.
since this may damage the eyes.
Power must never be supplied to a pickup with a damaged laser
output part (objective lens, etc.).
INVISIBLE LASER RADIATION EXPOSURE TO BEAM
IS DANGEROUS CLASS
1
LASER PRODUCT
OUTPUT POWER : 0.6 mW
MAX WAVELENGTH : 790
nm
L
\
/
CAUTION - USE OF CONTROLS OR ADJUSTMENTS OR PERFORMANCE OF PROCEDURES OTHER THAN THOSE
SPECIFIED IN THE OPERATING INSTRUCTIONS MAY RESULT IN HAZARDOUS RADIATION EXPOSURE.
THE COMPACT DISC PIAYER SHOULD NOT BE ADJUSTED OR REP-AIRED BY ANYONE EXCEPT PROPERLY
QUALIFIED PERSONNEL.
1.
a.
.,
b.
Precautions for
handling the pickup and semiconductors
(particularly the lCs)
The pickup
and semiconductors (particularly th lCS) may be
\ damaged if they come into contact with a
sou ~e of high
voltage static electricity.
Do not bring them, therefore, into
contact with or into the vicinity of anything which has
been
charged with high voltage static.
The pickup consists of a large number of optical and precision
parts. Do not store or repair it, therefore, in any location
with a high temperature, high humidity, high magnetic fields
or high dust concentration. (Since the pickup contains a
powerful magnet,
it must not be brought near any
magnetized objects.)
C.DO not apply Srong external pressure to the pickup or subject
it to impact. Actions like these can cause the printed circuit
board to crack or malfunctioning to occur.
d. The pickup is a single integrated part which has been very
precisely adjusted. Therefore,
its adjustment points and set
screws must not be touched.
2. How to prevent static during handling
a. When replacing any of the parts, disconnect the power plug
from the unit being repaired.
b. All measuring instruments, tools and repair equipment must
be grounded. Cover the work bench where the repair work
will be done with a grounded electrically conductive sheet.
c.Ground the metal part of the soldering iron in order to
safeguard against leakage of electricity from the heater.
d.
Repair personnel must wear grounding bands around their
wrists to discharge static picked
up by their bodies.
These
bands are grounded through a resistor (with a lM:
resistance).
Note: Under no circumstances must be the grounding bands be
e.
3.
a.
b.
grounded without a resistor (with a
1
Ml resistance) since
doing so involves the risk of electric shocks.
Since static in the clothes of the repair personnel will not be
discharged by wearing
grounding bands, every care must be
taken not to allow the clothes to touch the pickup and
semiconductors (particularly the ICS).
The pickup, which is a single integrated part, is kept in a
conductive bag. Use this bag to convey the pickup from one
place to another. [n order to avoid damage resulting from
static which may occur when the pickup is removed from the
bag, make sure that it is not placed on top of the bag.
Cleaning the lens surface
Blow off dust on the lens using the kind of air brush which is
used
for cameras.
Remove stubborn dirt
with a cotton swab dipped in isopropyl
alcohol. Do not use any other type of cleaning fluid since it
may mark the plastic lens.
Notes: Do not use too much isopropyl alcohol: the excess ma)
seep inside the pickup.
The lens is held in place by a very feeble supper
spring. Therefore, when cleaning the lens, avo
applying any more force by the cotton swab than
necessary since this may bend the support spring out
shape.
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