Sharp Carousel R-930AK Panduan Servis - Halaman 17

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PROCEDURE

LETTER

If the capacitor is open, no high voltage will be available to the magnetron. Disconnect input leads and

check for short or open between the terminals using an ohmmeter.

Checking with a high ohm scale, if the high voltage capacitor is normal, the meter will indicate continuity

for a short time and should indicate approximately 10 M once the capacitor is charged. If the above is

not the case, check the capacitor with an ohmmeter to see if it is shorted between either of the terminals

and case. If it is shorted, replace the capacitor.

SECONDARY INTERLOCK SWITCH TEST

Isolate the switch and connect the ohmmeter to the common (COM.) and normally open (NO) terminal

of the switch. The meter should indicated an open circuit with the door open and a closed circuit with the

door closed. If improper operation is indicated, replace the secondary interlock switch.

PRIMARY INTERLOCK SYSTEM TEST

DOOR SENSING SWITCH

Isolate the switch and connect the ohmmeter to the common (COM.) and normally open (NO) terminal

of the switch, the meter should indicated an open circuit with the door open and a closed circuit with the

door closed. If improper operation is indicated, replace the door sensing switch.

PRIMARY INTERLOCK RELAY

Disconnect two (2) wire leads from the common (COM.) and normally open (NO) terminal of the primary

Interlock relay (RY2). Check the state of the relay contacts using a ohmmeter. The relay contacts should

be open. If the relay contacts are closed, replace the relay itself.

MONITOR SWITCH

Disconnect the oven from power supply.

Before performing this test, make sure that the secondary interlock switch and the primary interlock relay

are operating properly, according to the above Test Procedures. Disconnect the wire lead from the

monitor switch (NC) terminal. Check the monitor switch operation by using the ohmmeter as follows.

When the door is open, the meter should indicate a closed circuit. When the monitor switch actuator is

pushed by a screw driver through the lower latch hole on the front plate of the oven cavity with the door

opened (in this condition the plunger of

the monitor switch is pushed in), the

meter should indicate an open circuit.

If improper operation is indicated, the

switch may be defective. After testing

the monitor switch, re-connect the wire

lead to the monitor switch (NC) termi-

nal and check for continuity of monitor

circuit.

BLOWN MONITOR FUSE

If the monitor fuse is blown when the door is opened, check the primary interlock relay, secondary

interlock switch, door sensing switch and monitor switch according to the "TEST PROCEDURE" for

those switches before replacing the blown monitor fuse.

CAUTION: BEFORE REPLACING A BLOWN MONITOR FUSE, TEST THE PRIMARY INTERLOCK

If the monitor fuse is blown by improper switch operation, the monitor fuse and switch must be replaced

with "monitor fuse and switch assembly" part number FFS-BA012WRK0, even if the monitor switch

operates normally. The monitor fuse and switch assembly is packed with 20 ampere fuse and switch.

TEMPERATURE FUSE TEST

A continuity check across the temperature fuse terminals should indicate a closed circuit unless the

temperature of the magnetron reaches approximately 302˚F (150˚C). If the temperature fuse has

opened, replace the temperature fuse.

TEST PROCEDURES

RELAY, SECONDARY INTERLOCK SWITCH, DOOR SENSING SWITCH AND MONITOR

SWITCH FOR PROPER OPERATION.

COMPONENT TEST

N.C.

MONITOR SWITCH

COM.

SCREW DRIVER

R-930AK

R-930AW

SECONDARY

INTERLOCK

OHMMETER

SWITCH