Read Sharp R-465 (serv.man3) Service Manual online
R-465(SL)
11
e) Wrong figure appears.
f) A certain group of indicators do not light up.
g) The figure of all digits flicker.
f) A certain group of indicators do not light up.
g) The figure of all digits flicker.
2-3 Other possible troubles caused by defective control unit.
a) Buzzer does not sound or continues to sound.
b) Clock does not operate properly.
c) Cooking is not possible.
b) Clock does not operate properly.
c) Cooking is not possible.
If the display fails to clear when the STOP/CLEAR key is depressed, first verify the flat ribbon cable
is making good contact, verify that the 2nd. interlock relay control switch operates properly; that is the
contacts are closed when the door is closed and open when the door is open.
If the 2nd. interlock relay control switch is good, disconnect the flat ribbon cable that connects the key
unit to the control unit and make sure the 2nd. interlock relay control switch is closed (either close the
door or short the 2nd. interlock relay control switch connector). 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 key 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 key 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.
CARRY OUT 3D CHECKS.
is making good contact, verify that the 2nd. interlock relay control switch operates properly; that is the
contacts are closed when the door is closed and open when the door is open.
If the 2nd. interlock relay control switch is good, disconnect the flat ribbon cable that connects the key
unit to the control unit and make sure the 2nd. interlock relay control switch is closed (either close the
door or short the 2nd. interlock relay control switch connector). 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 key 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 key 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.
CARRY OUT 3D CHECKS.
M
KEY UNIT TEST
TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
Remove the outer case and check voltage between the normal open terminal of the relay RY1 and
the normal open terminal of the relay RY2 on the power unit with an A.C. voltmeter. The meter should
indicate 230 - 240 volts, if not check oven circuit.
the normal open terminal of the relay RY2 on the power unit with an A.C. voltmeter. The meter should
indicate 230 - 240 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.
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,
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. 25.7V D.C.
Oven lamp / Turntable motor / Cooling fan motors
RY2
APPROX. 18.0V D.C.
High voltage transformer
CARRY OUT 4R CHECKS.
N
RELAY 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. If the foil pattern is open, follow the troubleshooting guide
given below for repair.
Problem: POWER ON, indicator does not light up.
CARRY OUT 3D CHECKS.
on the PWB, this foil pattern acts as a fuse. If the foil pattern is open, follow the troubleshooting guide
given below for repair.
Problem: POWER ON, indicator does not light up.
CARRY OUT 3D CHECKS.
O
PROCEDURES TO BE TAKEN WHEN THE FOIL PATTERN ON THE PRINTED WIRING BOARD
(PWB) IS OPEN
(PWB) IS OPEN
G11
G10
G 9
G 8
G 7
G 6
G 5
G 4
G 3
G 2
G 1
STOP
CLEAR
Fresh
Fish
Minced
Meat
Roast
Poultry
KITCHEN
TIMER
POWER
LEVEL
START
AUTO MINUTE
KG/LB
CONVERSION
Roast
Pork
Chicken
Portions
Ready
Meals
Jacket
potatoes
Rice/
Pasta
Vegetables
DOWN
UP
LESS
MORE
Chicken
Quarters
Meat
Joint
Whole
Poultry
Roast
Beef/Lamb
CLOCK
SET
Meal In One
DELAY
START
10min.
10sec.
1min.
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