Sharp R-209HW Service Manual page 18

R-209HK
R-209HW
PROCEDURE
LETTER
8. If any abnormal condition is defected, replace the control unit.
9. Disconnect the power supply cord and then remove outer case.
10.Open the door and block it open.
11.Discharge high voltage capacitor.
12.Reconnect all leads removed from components during testing.
13.Re-install the outer case (cabinet).
14.Reconnect the power supply cord after the outer case is installed.
15.Run the oven and check all functions.
L DEFROST TEST
(1) Place one cup of water in the center of the turntable tray in the oven cavity.
(2) Close the door, touch the " DEFROST " pad once, the number pad " 2 " for selecting " Steaks/Chops " and
the number pad " 5 " for enterring 0.5 lbs in weight. And then touch the " START " pad.
(3) The oven is in Defrost cooking condition.
(4) The oven will operate as follows.
MENU
DEFROST
0.5lb
(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 915Ω ±
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.
TEST PROCEDURES
1ST STAGE
LEVEL TIME
70% 35sec.
OCCURRENCE
1 Only pattern at "a" is broken.
2 Pattern at "a" and "b" are broken.
COMPONENT TEST
2ND STAGE 3RD STAGE
LEVEL TIME LEVEL
50% 52sec. 30%
CAUSE OR CORRECTION
*Insert jumper wire J1 and solder.
*Insert the coil RCILF2003YAZZ between "c" and "d".
c
16
TIME
45sec.
d
a
b
(J1)
T1