Sharp R-320BB Service Manual page 18

R-320BB
R-320BK
R-320BW
PROCEDURE
LETTER
the above method may be used (after clearing the control unit) to determine if the control unit or key
pad is at fault.
5. Reconnect all leads removed from components during testing.
6. Re-install the outer case (cabinet).
7. Reconnect the power supply cord after the outer case is installed.
8. Run the oven and check all functions.
K RELAY TEST
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. Remove the outer case and check voltage between Pin No. 1 of the 2 pin connector (A) and the
common terminal of the relay RY1 on the control unit with an A.C. voltmeter.
The meter should indicate 120 volts, if not check oven circuit.
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,
RELAY SYMBOL
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.
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
(5) If improper operation is indicated, the control unit is probably defective and should be checked.
TEST PROCEDURES
control unit is defective.
OPERATIONAL VOLTAGE
RY1 Approx. 24.0V D.C.
RY2 Approx. 23.0V D.C.
1ST STAGE
WEIGHT
LEVEL TIME
0.5lb 50% 40sec.
COMPONENT TEST
G 8 G 7 G 6
3
5 4
G 9
0 9 8
G10
MINUTE Chicken Chicken
G11
PLUS pieces breast
AUTO
Frozen
START
G12 START roll /
muffin
CLOCK
CONNECTED COMPONENTS
Oven lamp / Turntable motor / Cooling fan motor
Power transformer
2ND STAGE
LEVEL TIME LEVEL
30% 37sec.
16
G 5 G 4 G 3 G 2
2 1
Reheat Popcorn
Baked
Fresh
7 6
potato
Vegetables
Ground meat
Frozen Fish /
Rice INSTANT
Vegetables seafood
ACTION
Ground meat Fresh
Steaks /
Frozen
COMPU roll /
chops entrees
muffin
DEFROST
3RD STAGE
TIME
20% 42sec.
G 1
KITCHEN
TIMER
POWER
LEVEL
STOP
CLEAR