GE MV1526B Test and Checkout PROCEDURES, and Trouble Shooting, Test Procedures, Magnetron

Page 26

TEST AND CHECKOUT PROCEDURES, AND TROUBLE SHOOTING

- CAUTIONS -

-DISCONNECT THE POWER SUPPLY CORD FROM THE WALL OUTLET WHENEVER REMOVINGING THE CABINET FROM THE UNIT. PROCEED WITH THE TESTS ONLY AFTER DISCHARGING THE HIGH VOLTAGE CAPACITOR AND REMOVING THE WIRE LEADS FROM THE PRIMARY WINDING OF THE HIGH VOLTAGE TRANSFORMER. (SEE FIGURE 24)

-ALL OPERATIONAL CHECKS WITH MICROWAVE ENERGY MUST BE DONE WITH A LOAD (1 LITER OF WATER IN CONTAINER) IN THE OVEN.

Filament

Winding

Secondary

Winding

Primary

Winding

A. TEST PROCEDURES

 

 

Figure 24

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

COMPONENTS

 

TEST PROCEDURES

 

 

RESULTS

 

 

 

 

 

 

 

 

 

 

 

 

 

1)

Measure the resistance: Across the

 

 

 

 

 

 

 

 

 

filament terminals of the magnetron

 

 

Normal reading:

 

 

 

 

 

with an ohm-meter on Rx1 scale.

 

 

Less than 1 ohm.

 

 

 

 

2)

Measure the resistance: Between

 

 

Normal reading:

 

MAGNETRON

 

 

 

each filament terminal of the

 

 

Infinite ohms.

 

(Wire leads are

 

 

 

magnetron and the chassis ground

 

 

 

 

 

removed)

 

 

 

with an ohm-mater on high test scale.

 

 

NOTE: Replace the magnetron, if the

 

 

 

 

 

 

 

 

magnetron checks and all of the

 

 

 

 

 

 

 

 

high voltage component tests are

 

 

 

 

 

 

 

 

good, but the unit still does not heat

 

 

 

 

 

 

 

 

a load.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1)

Measure the resistance:

 

 

 

 

 

 

 

 

 

With an ohm-meter on Rx1 scale.

 

 

Normal readings:

 

HIGH-VOLTAGE

 

 

 

a. Primary winding;

 

 

Approx. 0.3 to 0.5 ohm.

 

TRANSFORMER

 

 

 

b. Filament winding;

 

 

Less than 0.1 ohm.

 

(Wire leads are

 

 

 

c. Secondary winding;

 

 

Approx. 65 to 120 ohms.

 

removed)

 

 

 

 

 

 

 

 

 

 

 

 

2)

Measure the resistance:

 

 

 

 

 

 

 

 

 

With an ohm-meter on highest scale.

 

 

Normal readings:

 

 

 

 

 

a. Primary winding to ground;

 

 

Infinite ohms.

 

 

 

 

 

b. Filament winding to ground;

 

 

Infinite ohms.

 

 

 

 

 

 

 

 

 

 

 

NOTE: A MICROWAVE ENERGY LEAKAGE TEST MUST ALWAYS BE PERFORMED WHEN THE UNIT IS SERVICED FOR ANY REASON.

7-15

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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 Features and Specifications Features General Information for ServiceGeneral Precautions in USE 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 Magnetron Test and Checkout PROCEDURES, and Trouble ShootingTest Procedures HIGH-VOLTAGEHIGH-VOLTAGE Capacitor HIGH-VOLTAGE DiodeMatrix Circuit for FPC ConnectorTouch KEY Board Connectorkey CON Checkout Procedures for Fuse Blowing Checkout ProceduresPower Level RELAY2YES Good Checkout Procedures for Relay Problem aRELAY3 Problem B 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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