Sharp Carousel R-1211 Panduan Servis - Halaman 11

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Halaman Cetak
Sharp Carousel R-1211 Panduan Servis
PROCEDURE
LETTER
2. Open the door and block it open.
3. To discharge high voltage capacitor, wait for 60 seconds.
4. If the display fails to clear when the STOP/CLEAR pad is depressed, first verify the flat ribbon cable
is making good contact, verify that the door sensing switch operates properly; that is the contacts are
closed when the door is closed and open when the door is open. If the door sensing switch is good,
disconnect the flat ribbon cable that connects the key unit to the control unit and make sure the door
sensing switch is closed (either close the door or short the door sensing switch connecter). Use the
Key unit matrix indicated on the control panel schematic and place a jumper wire between the pins
that correspond to the STOP/CLEAR pad making momentary contact. If the control unit responds by
clearing with a beep the key unit is faulty and must be replaced. If the control unit does not respond,
it is faulty and must be replaced. If a specific pad does not respond, 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.
8. Run the oven and check all functions.
L
RELAY TEST
1. Disconnect the power supply cord, and then remove outer case. Refer to procedure of " REMOVAL
OF OVEN FROM WALL " and " OUTER CASE REMOVAL ".
2. Open the door and block it open.
3. To discharge high voltage capacitor, wait for 60 seconds.
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. Check voltage between normal open terminal of the relay RY2 and the normal open 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, RY2, RY3 and RY4 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
RY1
RY2(COOK)
RY3
RY4
8. Disconnect the power supply cord.
9. Open the door and block it open.
TEST PROCEDURES
COMPONENT TEST
G 8
G 7
G 6
5
4
3
0
9
8
HOT
DEFROST
BEVERAGE
WATER
CENTER
FRESH
FROZEN
SENSOR
ROLLS /
ROLLS /
COOK
MUFFINS
MUFFINS
CENTER
control unit is defective.
OPERATIONAL VOLTAGE
Approx. -26.3V D.C.
Approx. -25.3V D.C.
Approx. -26.3V D.C.
Approx. -26.3V D.C.
9
G 5
G 4
G 3
POWER
2
1
LEVEL
STOP
7
6
CLEAR
BAKED
FRESH
TASK
POTATOES
VEGETABLES
LIGHT
KEEP
SENSOR
POPCORN
WARM
REHEAT
PLUS
CONNECTED COMPONENTS
Oven lamp / Fan motor / Turntable motor
Power transformer
Hood lamp
Hood lamp
R-1210
R-1211
G 2
G 1
TIMER
CLOCK
START
MINUTE PLUS
ACCENT
LIGHT
CUSTOM
HELP