R-290H(S)
13
To protect the electronic circuits, this model is provided with a fine foil pattern added to the primary
on the PWB, this foil pattern acts as a fuse. If the foil pattern is open, follow the troubleshooting guide
given below for repair.
Problem: POWER ON, indicator does not light up.
CARRY OUT 3D CHECKS.
STEPS
OCCURRENCE
CAUSE OR CORRECTION
The rated voltage is not applied between Pin
1
No. 3 of the 2 pin connector (A) and the
Check supply voltage and oven power cord.
normal open terminal of the relay RY2.
2
The rated voltage is applied to primary side
Low voltage transformer or secondary circuit defective.
of low voltage transformer.
Check and replace control unit.
3
Only pattern at "a" is broken.
*Insert jumper wire J1 and solder.
4
Pattern at "a" and "b" are broken.
*Insert the coil RCILF2003YAZZ between "c" and "d".
NOTE: At the time of making these repairs, make
a visual inspection of the varistor. Check
for burned damage and examine the trans-
former with tester for the presence of
layer short-circuit (check primary coil re-
sistance). If any abnormal condition is
detected, replace the defective parts.
CARRY OUT 4R CHECKS.
TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
N
PROCEDURES TO BE TAKEN WHEN THE FOIL PATTERN ON THE PRINTED WIRING
BOARD (PWB) IS OPEN
T1
a
b
c
d
(J1)
VRS1
RY2
RY1
CN-A
1
3
Summary of Contents for R-290H
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