Sharp r-8580 guide

R -8580

PROBLEM	POSSIBLE CAUSE	TEST PROCEDURE OR
		CORRECTION

CONVECTION

rCONV indicator light but oven does not go into a cook cycle when START pad is touched.

CONV indicator lights, but heating element does not heat.

Temperature in the oven cavity is lower or higher than preset.

Lower than preset temperature.

Cooling fan motor, turntable mo-

tor and oven lamp run intermitantly or all the time.

Convection cycle runs 3 minutes then shuts down.

SENSOR

Oven is in the sensor cooking condition but AH sensor does not end stage 1 or does not stop cooking cycle or the oven stops soon.

Defective

heater

relay(RY4)

on

relay

unit.

Procedure

N.

Defective

key

unit.

Procedure

P.

Defective

thermistor.

procedure

K.

Open

wiring

in

circuit to

above compo-

Check

and

repair

wiring.

nents.

Defective

convection

heater.

Procedure

J.

Defective

heater

relay(RY4)

on

relay

unit.

Procedure

N.

Defective

CPU

unit.

Procedure

0.

Open

or

loose

wire

connection

to

the

Check

and

repair

wiring.

above

components.

Defective

convection

heater.

Procedure

J.

Defective

CPU

unit.

Procedure

0.

Defective

convection

motor.

Replace

motor.

Defective

thermistor.

Procedure

K.

Defective

cooling

fan

motor.

Replace

fan motor.

Defective

dumper

motor.

Procedure

L.

Defective

drive

mechanism

of convection

Check.

fan.

Low power supply voltage.

Check voltage.

Thermistor

shorted.

Procedure

K.

Thermistor

open.

Procedure

K.

AH sensor	open	and/or short.	Procedure	0.
Defective	CPU	unit.	Procedure	0.

0pen or loose wire connection to the Check and repair wiring. above components.

AH sensor assembly and/or steam duct Check and repair them. are not re-installed correctry.

13

Image 14

Sharp r-8580 manual Nents Defective Convection Heater Procedure RelayRY4 Unit

Contents

Sharp Convection Microwave Oven Microwave RadiationSharpcorporatkn OSAKA, Japan 8580 Specification Product Description Auto-TouchTM Control Panel OFF Condition OperationDescription of Operating Sequence Cooking Condition Preheating Condition Convection Cooking ConditionAutomatic MIX Cooking Condition Convection Cooking Condition Easy Defrost Cooking Sensor Cooking ConditionCompu Cook Cooking Sequence Figure O-l. Oven Schematic-OFF Condition 240V-50Hz G-4 Figure O-3. Oven Schematic-Convection Cooking Condition Description and Function of Components Damper OPEN-CLOSE Mechanism Convection HeaterConvection Cooking System OFF Condjtion Problem Possible Cause Test Procedure CorrectionServicing Problem Possible Cause Test Procedure or Correction Nents Defective Convection Heater Procedure RelayRY4 Unit Test Procedures Letter Component Magnetron Assembly Test Microwave Output Power Switch Test Procedure Letter Test Procedures CONT’D Component TestPower Transformer Test High Voltage Rectifier and Rectifier Test TEMP. Fuse Test Test Procedures CONT’D Letter Component Monitor Switch TestBlown Fuse Thermal CUT-OUT Thermistor Test Procedure LetterDamper Switch Test Damper Motor Test Test Procedures CONT’O Letter Component Relay Unit Relay Symbol Operational Connected Components Voltage KEY Unit Test Water load cooking test Testing Method for AH Sensor AND/OR Control UnitChecking the initial sensor cooking condition Sensor Dummy Resistor Circuit Steps Occurance Cause or Correction LSI Touch Control Panel AssemblyOutline of Touch Control Panel Description of LSJ LSI IZA096DR Kev strobe siqnal Seqment Data signalSeqment Data Siqnal Internal clock oscillation frequency input settinq Power source voltage Signal to SoundSignal svnchronized with commercial source frequencv50Hz Magnetron High-voltaae Circuit driving Signal Signal cominq from touch kev Damper motor relav driving signalInput signal which communicates the door open/close Signal coming from touch key RI4 Temperature measurement input Oven ThermistorSensor Inuut Terminal For Manufacture Test Absolute Humidity Sensor Circuit Shapes of Electronic Components Other PrecautionsServicing Servicing of Touch Control Panel High Voltage Capacitor Removal Component Replacement and Adjustment ProcedurePower Transformer Removal Turntable Motor AND/OR Coupling Removal Cooling FAN Motor Removal Magnetron RemovalConvection Motor Removal Damper Upper Latch Switch / Monitor Switch RemovalLower Latch Switch and Stop Switch Removal Removal Control Panel Assembly and CPU Unit Removal CPU Unit and KEY Unit Door Adjustment Door Replacement and AdjustmentDoor Replacement Requirement Preparation for TestingMicrowave Measurement 11II II II II OIL 8580 Figure S-3. Printed Wiring Board II I Parts List AY AK AF AH Q8L RR-DZ561PDREO AT AH FOVN-A090WRYO AG AD 11 AA 13 AA Ii AA Replacement Parts List 8580 Control Panel Parts Door Assembly Miscellaneous ‘Y \‘\ Packing and Accessories 8580 8580 Sharp