R21LTF
8 – 7
5) Make a visual inspection of the varistor. Check for burned damage and examine
the transformer with a tester for the presence of layer short-circuit (check the pri-
mary coil resistance which is approximately 915
Ω±
10%). If any abnormal condi-
tion is detected, replace the control unit.
6) Reconnect all leads removed from components during testing.
7) Re-install the outer case (cabinet).
8) Reconnect the power supply cord after the outer case is installed.
9) Run the oven and check all functions.
2. Follow the troubleshooting guide given below, if indicator does not light up after
above check and repairs are finished.
1) Disconnect the power supply cord and then remove outer case.
2) Open the door and block it open.
3) Discharge high voltage capacitor.
4) Disconnect the leads to the primary of the power transformer.
5) Ensure that these leads remain isolated from other components and oven chassis by using insulation tape.
6) After that procedure, re-connect the power supply cord.
7) Follow the troubleshooting guide given below for repair.
8) Disconnect the power supply cord and then remove outer case.
9) Open the door and block it open.
10)Discharge high voltage capacitor.
11)Reconnect all leads removed from components during testing.
12)Re-install the outer case (cabinet).
13)Reconnect the power supply cord after the outer case is installed.
14)Run the oven and check all functions.
1
Only pattern at “a” is broken.
*Insert jumper wire J1 and solder.
2
Pattern at “a” and “b” are broken. *Replace control unit.
STEPS
OCCURRENCE
CAUSE OR CORRECTION
1
The rated AC voltage is not present between Pin No. 1 of the 3-pin con-
nector (A) and the normal open terminal of the relay RY2
Check supply voltage and oven power cord.
2
The rated AC voltage is present at primary side of low voltage trans-
former.
Low voltage transformer or secondary circuit defective.
Check and replace control unit.
(17)
a
b
c
d
(C T 1)
(J 1)
(J
7
)
(T
B
1
)
12
P
VR
S
1
(V
R
S
2
)
PO
W
E
R
7
