Sharp r-8580 manual Servicing, OFF Condjtion, Problem Possible Cause Test Procedure Correction

Page 12

SERVICING

 

 

 

 

 

 

 

 

 

 

 

 

TROUBLESHOOTING

 

 

GUIDE

 

 

 

 

 

 

 

 

 

 

 

When

troubleshooting

 

the microwave

 

oven,

it

is

 

IMPORTANT:

lf

the

oven

becomes

inoperative

be-

helpfull

to

follow

the

Sequence

of

Operation

in

per-

 

 

 

 

 

 

cause

of a blown

fuse

 

in the

monitor

forming the checks. Many of the possible causes of

 

 

 

 

 

 

switch and upper latch switch circuit,

 

 

 

 

 

 

check the monitor switch and upper

trouble

 

will

 

require

that

a

specific

test

be

performed.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

latch switch before replacing the fuse.

These

tests

are

given

a

procedure

letter

which

will

be

 

 

 

 

 

 

 

 

 

 

 

 

If

the

fuse

is

replaced,

the

monitor

found

in

the

“Test Procedure”section.

 

 

 

 

 

 

 

 

 

 

 

 

switch

should

be

replaced

at

same

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

time.

 

 

 

 

 

 

 

(RD8’ll

OZU)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

PROBLEM

 

 

 

 

 

 

POSSIBLE

CAUSE

 

 

 

TEST

PROCEDURE

OR

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CORRECTION

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

OFF CONDJTION

 

 

 

 

 

 

 

 

 

 

 

 

 

Home

fuse

blows

when

power

Shorted

wire

in

power

cord

or

wire

har-

Replace cord or check wiring.

cord

is

plugged

into

wall

recepta-

ness.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

cle.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Fuse blows when power cord is

Shorted

wire

in

power

cord

or

wire

har-

Replace

power

cord or

check

plugged

into wall

receptacle.

 

ness.

 

 

 

 

 

 

 

 

 

 

 

 

and repair

harness.

 

 

 

 

 

 

 

 

 

 

 

 

 

Defective

monitor

switch.

 

 

 

 

 

 

Procedure

 

F.

 

 

 

 

 

88:88

do

not

appear

in

display

No

power

at

outlet.

 

 

 

 

 

 

 

Check

home

fuse.

 

 

 

when

power

cord

is

first

plugged

Blown

fuse.

 

 

 

 

 

 

 

 

 

 

Procedure

 

G.

 

 

 

 

 

into

wall outlet.

 

 

 

 

 

 

Blown

magnetron

temp.

fuse.

 

 

 

 

Procedure

 

H.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Defective thermal cut-out.

 

 

 

 

 

 

Procedure

 

I.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Open

wire in power

cord,

wiring

harness,

Replace or

repair

wiring.

 

 

 

 

 

 

 

 

 

 

 

 

 

or wrrrng between control panel assembly

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

units.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Defective

CPU

unit.

 

 

 

 

 

 

 

Procedure

 

0.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Defective

relay

unit.

 

 

 

 

 

 

 

Procedure

 

N.

 

 

 

 

 

Display

does not

operate

properly

Defective

key unit.

 

 

 

 

 

 

 

 

Procedure

 

P.

 

 

 

 

 

when

 

STOP/CLEAR

 

 

key

is

Defective

CPU

unit.

 

 

 

 

 

 

 

Procedure

 

0.

 

 

 

 

 

touched.

 

(B uzzer should

sound

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Defective

relay

unit.

 

 

 

 

 

 

 

Procedure

 

N.

 

 

 

 

 

and time of day should

appear

in

 

 

 

 

 

 

 

 

 

 

 

 

 

display.)

 

 

 

 

 

 

 

 

 

Defective

stop

switch.

 

 

 

 

 

 

 

Procedure

 

E.

 

 

 

 

 

Oven lamp does not light with

No

power

in

home.

 

 

 

 

 

 

 

Check

wall

outlet.

 

 

 

door

opened.

 

 

 

 

 

 

 

, Open wire in power cord or wire harness. , Replace same or repair wir- 1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

rng.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Defective

oven

lamp.

 

 

 

 

 

 

 

Replace.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Defective

upper

latch

switch.

 

 

-*

 

Procedure

E.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Blow fuse.

 

 

 

 

 

 

 

 

 

 

Procedure

G.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Defective thermal cut-out.

 

 

 

 

 

 

Procedure

I.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Defective

magnetron temp.

fuse.

 

 

 

Procedure

H.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Open

or

loose

wire

connection

to

the

Check

wiring.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

above

components.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

11

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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 Convection Heater Convection Cooking SystemDamper OPEN-CLOSE Mechanism Problem Possible Cause Test Procedure Correction ServicingOFF Condjtion 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 Testing Method for AH Sensor AND/OR Control Unit Checking the initial sensor cooking conditionWater load cooking test Sensor Dummy Resistor Circuit Steps Occurance Cause or CorrectionTouch Control Panel Assembly Outline of Touch Control PanelLSI 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 RemovalMagnetron Removal Convection Motor RemovalCooling FAN 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 Replacement and Adjustment Door ReplacementDoor Adjustment Preparation for Testing Microwave MeasurementRequirement 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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