Sanyo EM-C1800MK, Service Manual

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7. DISASSEMBLY INSTRUCTIONS
- OVEN MUST BE DISCONNECTED FROM ELEC-
TRICAL OUTLET WHEN MAKING REPLACEMENTS,
REPAIRS, ADJUSTMENT AND CONTINUITY
CHECKS BEFORE PROCEEDING WITH ANY RE-
PAIR WORK AFTER DISCONNECTING, WAIT AT
LEAST 1 MINUTE, UNTIL THE CAPACITOR IN THE
HIGHVOLTAGE AREA HAS FULLY DISCHARGED.
A. REMOVING PRIMARY INTERLOCK SWITCH
(See Figure 1 on page 1)
(1) Disconnect all lead wires from the primary in-
terlock switch.
(2) Remove 2 screws securing the lever stopper.
(3) Remove 1 screw securing the switches. Then
pull out the switches.
(4) Make necessary adjustment, and make micro-
wave energy leakage check according to “1. AD-
JUSTMENT PROCEDURE FOR SWITCHES” an
page 1, after it is replaced with new one, and
check proper operation of it according to
“CHECKOUT PROCEDURE FOR SWITCHES”
on page 7.
B.REMOVING INTERLOCK MONITOR AND DOOR
SENSING SWITCH
(See Figure on page 1)
(1) Disconnect all lead wires from the interlock moni-
tor switch and door sensing switch.
(2) Remove 1 screw securing the these switches.
Then pull out the switches.
(3) Make necessary adjustments or replacement of
switch by the reversing step (2) and check mi-
crowave energy leakage according to “1. AD-
JUSTMENT PROCEDURE FOR SWITCHES” on
page 1, after it is replaced with new one, and
check proper operation of it according to
“CHECKOUT PROCEDURE FOR SWITCHES”
on page 7.
WHEN REPLACING ANY DOOR MICROSWITCH,
REPLACE WITH THE SAME TYPE SWITCH SPECI-
FIED ON THE PARTS LIST.
C. REMOVING FUSE
Remove the 10A fuse with screwdriver.
NOTES
- When replacing the 10A fuse, be sure to use an exact
repair part.
- If the 10A fuse blows immediately, check the primary
interlock switch, the relay 3 and 4 (on the control cir-
cuit board) and the interlock monitor switch according
to “CHECKOUT PROCEDURE FOR SWITCHES” on
page 8. and make sure to check the microwave en-
ergy leakage according to “1. ADJUSTMENT PROCE-
DURE FOR SWITCHES” on page 1, when the primary
interlock switch, the relay 3 and 4 or the interlock moni-
tor switch is adjusted or replaced.
- If the primary interlock switch, the relay 3 and 4 or
the interlock monitor switch operate properly, deter-
mine which of the followings is defective : control cir-
cuit board, blower motor, gear motor, high voltage trans-
former, high voltage capacitor, high voltage diode or
magnetron.
- If the high voltage diode is defective replace not only
the high voltage diode but also the fuse diode.
D. REMOVING DISPLAY CIRCUIT BOARD
(1) Disconnect all lead wires of the Control panel
from the Control PCB and Power PCB.
(2) Remove 4 screws securing the Control panel
Ass’y to the oven cavity.
(3) Push up and pull out the Control panel Ass’y.
(4) Remove 4 screws securing the Display PCB.
(5) Take out the Display PCB and push up the lever
end of the plastic fastener and remove the FPC
connector from the connector socket S101.
CAUTION:
When replacing new Display PCB please take big
care that all 4 LED heads shoul dexacty be in-
serted into the square holes of control frame all
at once. Never force to push any LED lead in the
PCB.
E. REMOVING MAGNETRONS
(1) Remove 2 screws securing the thermal limitter .
(2) Disconnect 2 lead wires from the magnetron
terminals by removing 2 connectors.
(3) Remove thermistor (lower magnetron) by
pulling horizontally.
(4) Remove 4 hex nuts (upper magnetron) or 2 hex
nuts (lower magnetron)securing to the
waveguide.
(5) Remove lower magnetron.
(6) Take out the magnetron VERY CAREFULLY.
NOTES
- When removing the magnetron, make sure that its
dome does not hit any adjacent parts, or it may be
damaged.
- When replacing the magnetron, be sure to install the
magnetron gasket in the correct position and be sure
that the gasket is in good condition.
- After replacing the magnetron, check for microwave
make sure the microwave energy leakage is below the
limit of the regulation (5mW/cm
2 ).