Sharp R-320CD Service Manual page 20

R-320CD/CK/CW
R-330CK/CW
PROCEDURE
LETTER
(3) The oven is in Compu Defrost cooking condition.
(4) The oven will operate as follows
(5) If improper operation is indicated, the control unit is probably defective and should be checked.
M FOIL PATTERN ON THE PRINTED WIRING BOARD TEST
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.
1. Foil pattern check and repairs.
2. Follow the troubleshooting guide given below, if indicator does not light up after above check and
TEST PROCEDURES
WEIGHT 1ST STAGE
LEVEL
0.5lb 60%
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) Follow the troubleshooting guide given below for repair.
STEPS OCCURRENCE
1 Only pattern at "a" is broken.
2 Pattern at "a" and "b" are broken.
5) Make a visual inspection of the varistor.
Check for burned damage and exam-
ine the transformer with a tester for the
presence of layer short-circuit (check
the primary coil resistance which is
approximately 212
abnormal condition is detected, replace
the defective parts.
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.
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.
STEPS OCCURRENCE
1 The rated AC voltage is not present between
Pin No. 1 of the 2-pin connector (A) and the
common terminal of the relay RY1.
2 The rated AC voltage is present at primary
side of low voltage transformer.
8 ) Disconnect the power supply cord, and then remove outer case.
9) Open the door and block it open.
COMPONENT TEST
2ND STAGE
TIME LEVEL TIME
42sec. 40% 32sec.
*Insert jumper wire J1 and solder.
*Insert the coil RCILF2003YAZZ between "c" and "d".
d
10%). If any
a
Check supply voltage and oven power cord.
Low voltage transformer or secondary circuit defective.
Check and repair.
18
CAUSE OR CORRECTION
CN - A
(J1)
b
c
CAUSE OR CORRECTION