Samsung CE979GSE Service Manual page 22

7-3 Problem Analysis
7-3-1 When inserting the power plug (function selection, door on/off)
Problem
No alphivumeric a. Fuse (250V, 10A)
display b. Magnetron and case,
c. Power plug and socket
d. 1st and 2nd of LVT
e. Connector of PCB board
f. Highlight indication plate
g. Circuit within the PCB board
Fuse is damaged a. Power transformer
(short circuit) b. Safety switch
c. Monitor switch (short switch)
d. HVC
e. Latch operation
7-3-2 When operating
Problem
Electrical a. Grounding wire
shock b. AC 230V power line is
Lamp is not on a. Lamp and lead wire
b. Check the lamp relay
c. Thermostat 2EA
d. LVTransformer
Elevation a.Check the connections to
action the elevation assembly
unsatisfactor b. Continuity between terminals
of the elevation motor
(Measure after removing
Samsung Electronics
location
temperature switch
location
the chassis
the power leads)
Cause
Open bad contacts
Bad contacts
Cut-off
Bad insertion
Poor
Board DC fect on
Short circuit
Fusion and poor
Poor operation
Short circuit
Poor operation
Cause
Bad grounding
Lead wire not connected
Exposed part of the power Adjustment
line is shorting the
chassis
Disconnected
Coil disconnected
Bad contact point
Is the LVT wire normal?
Poor wire connection
Disconnection
Troubleshooting
Measures
Exchange
Exchange
Exchange,repair
Exchange
Repair
Exchange
PC Board exchange
Exchange
Exchange
Latch adjustment
Exchange
Latch adjustment
Measures
Inspection
Exchange/adjustment
Exchange
Exchange
Exchange/adjustment
Adjustment
Exchange/
Assembly exchange
7-5