7-3 Servicing Precautions
When trouble shooting or parts, be sure to observe
the following.
1. Be sure to let the resistance of 1
M½
contact the
human body before grounding. When it is
impossible to ground, let the human body contact
the power plug and the grounding wire once to
eliminate the potential damaging shock hazard.
¥After replacing the controller, the defective parts
should be returned to the suppliers of these parts
for root-cause analysis and incorporation into for
future product planning. At the time of return, be
sure to pack them together with repair parts.
Otherwise, it is impossible to perform root cause
analysis due to the static electricity.
<Notice on disassembly and repair>
2. The wiring should be properly connected in
accordance with the wiring diagram. Erroneous
wiring may cause faulty operation, smoke, or fire.
3. Be sure to pull out the power plug during repair.
4. Special attention should be paid to connection,
insulation treatment, and wiring work for the lead
wire.
¥ The lead wire should be soldered, and insulation-
treated with vinyl tape, or connected to the
pressure connection terminal for drain treatment.
¥ When connecting the lead wire, take care not to let
it touch hight components of metal sugared. This is
a "wloow"
5.Be sure to use only authorized replacement parts.
6. AC 110V-220V is applied between T1 and T2 of the
triac on the P.C.B Therefore, touching the radiating
plate accidentally may cause electric shock. Also,
the P.C.B. Both high and low voltages exist on the
P.C.B.
7. Do not replace any parts on the board, except the
tact switch on the P.C.B. assembly is in trouble. The
P.C.B assembly is treated with an insulation
coating, the enhanced moisture-proofing.
8. When you suspect that the operation of the micom
is faulty, take actions in accordance with the
specified troubleshooting procedures. Do not
attempt to replace the entire P.C.B. assembly
without first doing a root-cause analysis.
9. Because the parts installed in the P.C.B. are treated
with a urethane coating, they cannot be inspected
by the test bar. Therefore, first check the lower parts
for any abnormality using the lead wire of the
housing (LP-09-1). Going down connected with the
P.C.B.
SAMSUNG ELECTRONICS CO., LTD
7-3
7. Troubleshooting
