Read Sharp R-238ASL (serv.man8) Service Manual online
R238A(SL)
8 – 5
[14] Procedure N: PROCEDURES TO BE TAKEN WHEN THE FOIL PATTERN ON THE
PRINTED WIRING BOARD (PWB) IS OPEN
PRINTED WIRING BOARD (PWB) IS OPEN
Problem: POWER ON, indicator does not light up.
CARRY OUT 3D CHECKS.
NOTE: *At the time of making these repairs, 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 primary coil resistance). If any
abnormal condition is detected, replace the defective parts.
presence of layer short-circuit (check the primary coil resistance). If any
abnormal condition is detected, replace the defective parts.
CARRY OUT 4R CHECKS.
STEPS
OCCURRENCE
CAUSE OR CORRECTION
1
The rated AC voltage is not present between the normal open terminal of the
relay RY1 and the normal open terminal of the relay RY2.
relay RY1 and the normal open terminal of the relay RY2.
Check supply voltage and oven power cord.
2
The rated AC voltage is present to primary side of low voltage transformer.
Low voltage transformer or secondary circuit defective.
Check and repair.
Check and repair.
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”.
(J1)
VRS1
RY1
d
a
b
c