Sharp R-320EK Service Manual page 20

R- 320 EK
R- 320EQ
R-320EW
PROCEDURE
LETTER
L COMPU DEFROST TEST
WARNING : The oven should be fully assembled before following procedure.
(1) Place one cup of water in the center of the turntable tray in the oven cavity.
(2) Close the door, touch the " STEAKS / CHOPS " pad once.
(3) The oven is in Compu Defrost cooking condition.
(4) The oven will operate as follows
STEAKS/CHOPS
(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.
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
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 primary coil resistance which
is approximately 212Ω ± 10%). If any 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.
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.
STEPS
TEST PROCEDURES
MENU 1ST STAGE
LEVEL
0.5lb 70%
OCCURRENCE
1 Only pattern at "a" is broken.
2 Pattern at "a" and "b" are broken.
OCCURRENCE
The rated AC voltage is not present between
1 Pin No. 1 of the 2-pin connector (A) and the
common terminal of the relay RY1.
The rated AC voltage is present at primary
2
side of low voltage transformer.
COMPONENT TEST
2ND STAGE
TIME LEVEL TIME
37sec. 40% 30sec.
CAUSE OR CORRECTION
*Insert jumper wire J1 and solder.
*Insert the coil RCILF2003YAZZ between "c" and "d".
CAUSE OR CORRECTION
Check supply voltage and oven power cord.
Low voltage transformer or secondary circuit defective.
Check and repair.
18
d
c
b
(J1)
a