17
R-320HK
R-320HQ
R-320HW
RY1 and RY2 Relay Test
These relays are operated by D.C. voltage
Check voltage at the relay coil with a D.C. voltmeter during the microwave cooking operation.
DC. voltage indicated .................. Defective relay.
DC. voltage not indicated ............ Check diode which is connected to the relay coil. If diode is good,
control unit is defective.
RELAY SYMBOL
OPERATIONAL VOLTAGE
CONNECTED COMPONENTS
RY1
Approx. 24.0V D.C.
Oven lamp / Turntable motor / Cooling fan motor
RY2
Approx. 24.0V D.C.
Power transformer
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
PROCEDURE
LETTER
COMPONENT TEST
L
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.
3. Touch the " STEAKS / CHOPS " pad once.
4. The oven is in Defrost cooking condition.
5. The oven will operate as follows
MENU
1ST STAGE
2ND STAGE
3RD STAGE
STEAKS/CHOPS
LEVEL
TIME
LEVEL
TIME
LEVEL
TIME
0.5lb
70%
15sec.
60%
25sec.
30%
37sec.
6. If improper operation is indicated, the control unit is probably defective and should be checked.
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
OCCURRENCE
CAUSE OR CORRECTION
1
Only pattern at "a" is broken.
*Insert jumper wire J1 and solder.
2
Pattern at "a" and "b" are broken.
*Insert the coil RCILF2003YAZZ
between "c" and "d".
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 212
Ω
±
10%). If any abnormal condition
is detected, replace the control unit assembly.
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.
M
FOIL PATTERN ON THE PRINTED WIRING BOARD TEST
RY
2
VRS1
L1
J1
a
b
c
d
