GE MV1526B, MV1526W service manual Trouble Shooting

Page 32

C. TROUBLE SHOOTING

Before following this troubleshooting read “TRIAL OPERATION” on page 6-1.

• “DISPLAY” Problems, “A” thru “C”

 

• “HELP UP” Problems, “D” thru “E”

• “BUZZER Problems, “F”

PROBLEM - A: “PLEASE SET TIME OF DAY” does not appear in display window when power supply cord is plugged into wall outlet.

Check: 1. POWER SUPPLY

1 2. FUSE (See “CHECKOUT PROCEDURES FOR FUSE BLOWING: on page 7-18)

3. OVEN CAVITY THERMOSTAT

WH

RD

Measure voltage between pin 1 and pin 3 of connector CN1.

0 120

 

120V

Replace

 

 

circuit board

0

120

 

Voltage

Correct

incorrect

connections

 

NormalRuns circuit board

NormalRuns resistance

7-21

PROBLEM - B: Display does not show correct numbers and/or correct indications when programmed.

1

Measure resistance of touch key board after removing connector S1.

(See page 7-4 and 7-17)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Normal

 

Check contact

 

resistance

 

of connector S1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Resistance

 

Replace touch

 

incorrect

 

 

key board.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Runs

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Contact

 

 

 

 

 

Replace

 

 

 

 

Normal

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ok

 

 

 

 

circuit board

 

circuit board

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Poor

Correct

Normal

Runs

 

contact

seating

contact

 

Normal touch

 

 

Runs

 

 

 

key board

 

 

 

Image 32
Contents Safety Precautions in this Manual Microwave OvenPage Table of Contents Specifications Microwave Radiation AntennaInstallation Grounding InstructionsOperating Instructions Control PanelControl Panel Instructions Overall Circuit Diagram Schematic DiagramMatrix Circuit for Touch KEY Board General Information for Service General Precautions in USEFeatures and Specifications Features Trial OperationPreliminary Service InformationPrecautions and Repair Service Tips Microwave Leakage Test EquipmentPower Output Measurement Measurement with the Outer Case RemovedDisassembly Instructions Important NotesHOW to Remove the F.P.C. Connector HOW to Insert the F.P.C. ConnectorRemoving the OUT CASEFigure Removing the Door Interlock Switches Figures 9,10 Wire ColorRemoving Magnetron Removing Door Figure Assembling Door Removing the Ventilation FAN ASS’YRemoving the Turntable Motor Interlock System Interlock MechanismTest the Latch and Switch Sequence Interlock Continuity Test Components Test Procedure ResultsSwitches Test and Checkout PROCEDURES, and Trouble Shooting Test ProceduresMagnetron HIGH-VOLTAGEHIGH-VOLTAGE Capacitor HIGH-VOLTAGE DiodeMatrix Circuit for FPC ConnectorTouch KEY Board Connectorkey CON Checkout Procedures Power LevelCheckout Procedures for Fuse Blowing RELAY2Checkout Procedures for Relay Problem a RELAY3 Problem BYES Good YESCheckout Procedures for Circuit Board Trouble Shooting Thermostat Page Fuse Exploded View Control Panel Oven Cavity Latch Board Interior 50FZZA Installation Schematic Diagram of P.C.B Printed Circuit Board July

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