Servicing Precautions - Samsung HL67A750A1FXZA Service Manual

1-2 Servicing Precautions
Warning 1: First carefully read the "Safety Instruction" in this service manual.
When there is a conflict between the service and the safety instructions, follow the safety instruction at all times.
Warning 2: Any electrolytic capacitor with the wrong polarity will explode.
1. The service instructions are printed on the cabinet, and
should be followed by any service personnel.
2. Make sure to unplug the AC power cord from the power
source before starting any repairs.
(a) Remove or re-install parts or assemblies.
(b) Disconnect the electric plug or connector, if any.
(c) Connect the test part in parallel with the electrolytic
capacitor.
3. Some parts are placed at a higher position than the printed
board. Insulated tubes or tapes are used for this purpose.
The internal wiring is clamped using buckles to avoid
contact with heat emitting parts. These parts are installed
back to their original position.
4. After the repair, make sure to check if the screws, parts
or cables are properly installed. Make sure no damage is
caused to the repaired part and its surroundings.
5. Check for insulation between the blade of the AC plug and
that of any conductive materials (i.e. the metal panel, input
terminal, earphone jack, etc).
6. Insulation Check Process: Unplug the power cord from the
AC source and turn the switch on. Connect the insulating
resistance meter (500V) to the AC plug blade.
The insulating resistance between the blade of the AC plug
and that of the conductive material should be more than 1
㏁.
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7. Any B+ interlock should not be damaged.
If the metal heat sink is not properly installed, no connection
to the AC power should be made.
8. Make sure the grounding lead of the tester is connected to
the chassis ground before connecting to the positive lead.
The ground lead of the tester should be removed last.
9. Beware of risks of any current leakage coming into contact
with the high-capacity capacitor.
10. The sharp edges of the metal material may cause physical
damage, so protect yourself by wearing gloves during the
repair.
Precaution
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