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7-5 After-Repair Check List
No
Check item
1
Insulation resistance
2
Safety switch
operation
3
Applicability of parts
4
Placement of
lead wire
5
Connection of
screw and bolt
6
Alien substance
insertion check
7
Power cord check
8
Grounding check
Samsung Electronics
Checking and judging method
When measuring the insulation resistance between
the power plug and the grounding wire(with the
power plug disconnected from the socket and the
door closed) the resistance should be greater than
1§ or above. When to check :
a. When the electric field parts are exchanged
b. If the MWO is used in a very humid envir qwment
c. Unit is older than 5 years
Check that the safety switch is
operating correctly when opening and
closing the door
Check that exact replacement parts are being used
Check for looseness, jamming or terminal insertion
of the lead wire. (check that there are no shorts to
ground.
Check the connection between he screw and bolt.
Check for a cut line within the equipment,
combustible foreign matter, or loose hardware.
Check that there is no damage to the cord, plug,
socket etc.
Also check that power rating is adequate.
Check that the main body is grounded to the
PCB.
Explain to the customer that he following are
dancerous hazards :
a. Connection to the gas pipe
b. Connection to the vinyl water pipe
c. Connection to the telephone line.
Troubleshooting
Remarks
DC 500V Megatester
Primary switch
Monitor switch
Secondary switch
AC 230V
For the PCB ground
wire and power cord
ground wire,
Check the continuity
to ground.
7-7
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