Sharp r-8580 manual KEY Unit Test

Page 20

TEST PROCEDURES (CONT’O)

PROCEDURE

 

 

LETTER

COMPONENT

TEST

TOUCH CONTROL PANEL ASSEMBLY TEST

The touch control panel consists of circuits including semiconductors such as LSI, ICs, etc. Therefore, unlike conventional microwave ovens, proper maintenance cannot be performed with only a voltmeter and ohmmeter. In this service manual, the touch control panel assembly is di-

vided into three units Control Unit, Key Unit and Relay Unit and troubleshooting by unit re- placement is described according to the symptoms indicated.

1. Key Unit.

The following symptoms indicate a defective key unit. Replace the key unit.

a)When touching the pads, a certain pad produces no signal dt all.

b)When touching a number pad, two figures or more are displayed.

c)When touching the pads, sometimes a pad produces no signal. 2. Control Unit

The following symptoms indicate a defective control unit. Replace the control unit. 2-1 In connection with pads.

a)When touching the pads;a certain group of pads do not produce a signal.

b)When touching the pads, no pads produce a signal.

2-2 In connection with indicators

a)At a certain digit, all or some segments do not light up.

b)At a certain digit, brightness is low.

c)Only one indicator does not light up.

d)The corresponding segments of all digits do not light up; or they continue to light up.

e)Wrong figure appears.

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.

d)Proper temperature measurement is not obtained.

Note: When defective components, the Control Unit, Key Unit or Relay Unit are replaced, the defective part or parts must be properly packed for return in the shipping carton, with its cushion material, in which the new replacement part was shipped to you.

(RD82SOl U)

P

KEY UNIT TEST

If the indicator does not respond to touching a key Pad use the following matrix and place a jumper wire between the proper pin connections making momentary contact with the cable connector disconnected from the control unit.

If the indicator responds and oven goes into operation, the key unit was faulty. If there is no response, replace the control unit,

-9

3

160°C

I

4

150°C

I

3

13o”c2

70°C

I

1

40%

I

5-l

 

 

 

 

 

 

I

 

 

 

 

 

0

250°C

 

9

230-C

 

8

220°C

7

200%

6

 

180%

LowM’

 

HIGH

MED HIGH

 

 

MED

MU) Low

 

 

 

LOW

F

 

 

 

 

 

 

 

 

 

 

 

 

 

CLOCK

1 CLEAR

1 COOK

1

 

HOU)

DI

I

1 KEY UNIT ‘]

19

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Contents Sharp Microwave Radiation Sharpcorporatkn OSAKA, JapanConvection Microwave Oven 8580Specification Product DescriptionAuto-TouchTM Control Panel Operation Description of Operating SequenceOFF Condition Cooking ConditionConvection Cooking Condition Automatic MIX Cooking ConditionPreheating Condition Convection Cooking ConditionSensor Cooking Condition Compu CookEasy Defrost Cooking Cooking SequenceFigure O-l. Oven Schematic-OFF Condition 240V-50Hz G-4Figure 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 PowerProcedure Letter Test Procedures CONT’D Component Test Power Transformer TestSwitch Test High Voltage Rectifier and Rectifier TestTest Procedures CONT’D Letter Component Monitor Switch Test Blown FuseTEMP. Fuse Test Thermal CUT-OUTProcedure Letter Damper Switch TestThermistor Test Damper Motor TestTest Procedures CONT’O Letter Component Relay Unit Relay Symbol Operational Connected Components VoltageKEY 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 CorrectionLSI Touch Control Panel AssemblyOutline of Touch Control Panel Description of LSJ LSI IZA096DRSeqment Data signal Seqment Data SiqnalKev strobe siqnal Internal clock oscillation frequency input settinqSignal to Sound Signal svnchronized with commercial source frequencv50HzPower source voltage Magnetron High-voltaae Circuit driving SignalDamper motor relav driving signal Input signal which communicates the door open/closeSignal cominq from touch kev Signal coming from touch keyTemperature measurement input Oven Thermistor Sensor InuutRI4 Terminal For Manufacture TestAbsolute Humidity Sensor CircuitOther Precautions ServicingShapes of Electronic Components Servicing of Touch Control PanelComponent Replacement and Adjustment Procedure Power Transformer RemovalHigh Voltage Capacitor Removal Turntable Motor AND/OR Coupling RemovalCooling FAN Motor Removal Magnetron RemovalConvection Motor Removal Upper Latch Switch / Monitor Switch Removal Lower Latch Switch and Stop Switch RemovalDamper RemovalControl Panel Assembly and CPU Unit Removal CPU Unit and KEY UnitDoor Adjustment Door Replacement and AdjustmentDoor Replacement Requirement Preparation for TestingMicrowave Measurement 11II II II II OIL 8580 Figure S-3. Printed Wiring Board II IParts List AY AK AF AHQ8L RR-DZ561PDREOAT 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
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