R-222T(W)
8 – 3
[5] Procedure E: SWITCH TEST
CARRY OUT 3D CHECKS.
Isolate the switch to be tested and using an ohmmeter check between the terminals as described in the following table.
If incorrect readings are obtained, make the necessary switch adjustment or replace the switch.
CARRY OUT 4R CHECKS.
[6] Procedure F: TEMPERATURE FUSE TEST
CARRY OUT 3D CHECKS.
Disconnect the leads from the terminals of the temperature fuse. Then using an ohmmeter, make a continuity test across the two terminals as
described in the below.
If incorrect readings are obtained, replace the temperature fuse.
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.
CARRY OUT 4R CHECKS.
[7] Procedure G: 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.
If incorrect readings are obtained, replace the motor.
CARRY OUT 4R CHECKS.
[8] Procedure H: FUSE T6.3A
CARRY OUT 3D CHECKS.
If the fuse T6.3A is blown when the door is opened, check the 1st. latch switch, 2nd. interlock relay (RY2) and monitor switch.
If the fuse T6.3A is blown by incorrect door switching replace the defective switch(es) and the fuse T6.3A.
If the fuse T6.3A 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 T6.3A WITH THE CORRECT VALUE REPLACEMENT.
[9] Procedure I: 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.
Table: Terminal Connection of Switch
Plunger Operation
COM to NO
COM to NC
COM; Common terminal
Released
Open circuit
Short circuit
NO; Normally open terminal
Depressed
Short circuit
Open circuit.
NC; Normally close terminal
Table: Temperature Fuse Test
Parts Name
Temperature of “ON” condition
(closed circuit).
Temperature of “OFF” condition
(open circuit).
Indication of ohmmeter (When room
temperature is approx. 20
°
C.)
Temperature fuse 150
°
C
This is not resetable type.
Above 150
°
ti
u
c
ri
c
d
e
s
o
l
C
C
Table: Resistance of Motor
Motors
Resistance
Fan motor
Approximately 250
Ω
Turntable motor
Approximately 14.7 k
Ω
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
RED
WHT
FUSE
T6.3A
N
L
NOISE SUPPRESSION COIL
NOISE FILTER
