R-3A54
R-3E54
TEST PROCEDURES (CONT’D)
PROCEDURE
,
LETTER COMPONENT TEST
M
PROCEDURES TO BE TAKEN WHEN THE FOIL PATTERN ON THE PRINTED WIRING
BOARD (PWB) IS OPEN.
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 trou-
bleshooting guide given below for repair.
Problem: POWER ON, indicator does not light up.
/STEPS I OCCURANCE
CAUSE OR CORRECTION
1 ’
1 The rated AC voltage is not present at POWER ter- Check supply voltage and oven power cord. Please
j minal of CPU connector (CN-A)
use term “Low voltage transformer” when refering to
transformer Tl
2
i
1 The rated AC voltage is present at primary side of low
Low voltage transformer or secondary circuit defec-
i voltage transformer. tive. Check and repair.
‘3
Only pattern at “a” is broken.
“Insert jumper wire Jl and solder.
4
Pattern at “a” and “b” are broken. ‘Insert the coil RCILF2003YAZZ between “c” and
“d”.
I
NOTE:’
At the time of these repairs, make a visual in-
spection of the varistor for burning damage
and examine the transformer with tester for the
presence of layer short-circuit (check primary
coil resistance).
If any abnormal condition is detected, replace
the defective parts.
16
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