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1-1. Safety Precautions for Repairs
1. Safety Precautions
1) Since the equipment uses laser diode, ensure
that eyes and parts of the body do not come
near the laser diode while performing repair
service.
2) Do not disassemble pickup to repair. If the laser
diode is faulty, then replace the complete pickup
assembly.
3) Perform repair services away from electrical
equipments such as TV to avoid interference
from these equipments.
4) Ensure to unplug the power cord from the unit
before replacing any parts.
5) Ensure to insert the disc properly into the unit
before use.
6) Since this equipment cannot be used as a
standalone unit, it must be installed in a PC
(586 or higher) with appropriate device driver from
the floppy disk to verify proper operation.
7) This equipment has many parts with properties
related to safety. These parts are specifically
noted in the parts list and schematic drawings.
Ensure to replace these parts with new parts
that have the same specifications.
- Since the laser diode in the optical pickup
bundle can be easily damaged by the static
electricity in human body or clothing, use
the following grounding guidelines when
handling the bundle.
Wear a wrist strap with one end properly
grounded. The wrist strap discharges the static
electricity in human body.
Work on a conductive material such as copper
plate that is properly grounded.
Since the static electricity stored in clothing is
not easily discharged, ensure that clothing does
not make a contact with the pickup bundle.
1-2. Safety Precautions for Installations
A certain semiconductor components are highly
susceptible to damages caused by electrostatic
discharge (ESD).
Semiconductors components such integrated circuits,
field effect transistors, and other semiconductor
devices are examples of devices that are highly
sensitive to ESD.
Use the following guidelines to reduce the damages
caused by the ESD.
1) Before handling any semiconductor components
or parts that contains semiconductors,
immediately discharge all static electricity in the
body by making a contact with a grounded
metallic object. A commercially available wrist strap
may also be used.
The static electricity must be discharged to avoid
potential impact on the voltage during testing.
2) After removing ESD-sensitive components or
parts, place the items on a conductive surface
such as on a piece of aluminium to prevent
accumulation of charges and exposure to ESD.
3) Use properly grounded soldering iron to solder
or to de-solder ESD-sensitive components.
4) Only use anti-static soldering iron to de-solder
ESD-sensitive components.
Use of soldering irons not classified as “anti -static”
has enough electrostatic charges to cause damages
to the components.
5) Do not use chemical sprays such as Freon.
These chemicals have enough electrostatic
charges to cause damages to the ESD-sensitive
components.
6) Do not remove replacement parts from the
anti-static packaging until they are ready for
installation. [Most of the replacement parts are
packaged in conductive foam, aluminium, or
other conductive materials with all the leads
shorted together.]
7) Before removing the anti-static packing
materials for the new parts, make a contact with
the chassis or protective material for the circuits
to discharge the static charges.
8) Minimize body movement when handling
unprotected ESD-sensitive parts and
components. (The movement of body causes
build up of electrostatic charges from friction
between layers of clothing, and between the
shoes and the carpet which may cause damage
to the components.)
Caution: Ensure that the power does not get transferred to
the chassis or to the circuitry, and that all general
safety guidelines are followed.