Sharp R-326FS Service Manual page 20

R - 326FS
PROCEDURE
LETTER
STEAKS/CHOPS LEVEL
(6) 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 control unit.
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
8) Disconnect the power supply cord, and then remove outer case.
9) Open the door and block it open.
10) Discharge high voltage capacitor.
11) Reconnect all leads removed from components during testing.
12) Re-install the outer case (cabinet).
13) Reconnect the power supply cord after the outer case is installed.
14) Run the oven and check all functions.
TEST PROCEDURES
MENU 1ST STAGE
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 the normal open terminal of the relay RY1 and Check supply voltage and oven power cord.
the normal open terminal of the relay RY2.
The rated AC voltage is present at primary
2
side of low voltage transformer.
COMPONENT TEST
2ND STAGE
TIME LEVEL TIME
16sec. 60% 27sec.
CAUSE OR CORRECTION
*Insert jumper wire J1 and solder.
*Insert the coil RCILF2003YAZZ between "c" and "d".
CAUSE OR CORRECTION
Low voltage transformer or secondary circuit defective.
Check and replace the control unit.
18
3RD STAGE
LEVEL TIME
30% 41sec.
c
a
b
d