Sharp R-212 Service Manual download pdf (Page 13)

R-212B

TEST PROCEDURES

PROCEDURE

LETTER

COMPONENT TEST

to resistricted ventilation, cooling fan failure or a fault condition within the magnetron or HV circuit.

An open circuit temperature fuse (OVEN) indicates that the food in the oven cavity may catch fire, this

may be due to overheating produced by improper setting of the cooking time or failure of the control

panel.

H MOTOR WINDING TEST

CARRY OUT 3D CHECKS.

Disconnect the leads from the motor. Using an ohmmeter, check the resistance between the two

terminals as described in the table below.

I FUSE M6.3A

CARRY OUT 3D CHECKS.

If the fuse M6.3A is blown when the door is opened, check the 1st latch switch, 2nd interlock relay, 2nd

interlock relay control switch, monitor switch and monitor resistor.

If the fuse M6.3A is blown by incorrect door switching, replace the defective switch(s) and the fuse M6.3A.

If the fuse M6.3A is blown, there is a shorts or grounds in electrical parts or wire harness.

Check them and replace the defective parts or repair the wire harness.

CARRY OUT

4R CHECKS.

CAUTION: Only replace fuse with the correct value replacement.

Table: Resistance of Motor

Motors Resistance

Fan motor Approximately 390 ohms

Turntable motor Approximately 14.8 kohms

If incorrect readings are obtained, replace the motor.

CARRY OUT 4R CHECKS.

J NOISE FILTER TEST

CARRY OUT 3D CHECKS.

Disconnect the leads from the terminals of the noise filter. Using an ohmmeter, check between the

terminals as described in the following table.

If incorrect readings are obtained, replace the noise filter unit.

CARRY OUT 4R CHECKS.

MEASURING POINT INDICATION OF OHMMETER

Between N and L Open circuit

Between terminal N and WHITE Short circuit

Between terminal L and RED Short circuit

K HIGH VOLTAGE FUSE TEST

CARRY OUT 3D CHECKS.

If the high voltage fuse is blown, there could be a short in the high voltage rectifier or the magnetron.

Check them and replace the defective parts and the high voltage fuse.

CARRY OUT 4R CHECKS.

CAUTION: ONLY REPLACE HIGH VOLTAGE FUSE WITH THE CORRECT VALUE REPLACE-

MENT.

FUSE

M8A

LINE CROSS CAPACITOR

0.068µ/AC250V

NOISE SUPPRESSION COIL

LINE BYPASS

CAPACITOR

0.0022µ/AC250V

LINE BYPASS

CAPACITOR

0.0022µ/AC250V

NOISE FILTER

WHT RED

FUSE

M6.3A

1 2 ... 8 9 10 11 12 13 14 15 16 17 18 ... 35 36

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Sharp R-212 Service Manual Page 13

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