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GE LMAB1240ST service manual Component Test Procedure, Cautions, Components, Results

Models: LMAB1240ST

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COMPONENT TEST PROCEDURE

COMPONENT TEST PROCEDURE

CAUTIONS

1.DISCONNECT THE POWER SUPPLY CORD FROM THE OUTLET WHENEVER REMOVING THE OUTER CASE FROM THE UNIT. PROCEED WITH THE TEST ONLY AFTER DISCHARGING THE HIGH VOLTAGE CAPACITOR AND REMOVING THE WIRE LEADS FROM THE PRIMARY WINDING OF THE HIGH VOLTAGE TRANSFORMER. (SEE PAGE 2-1)

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

COMPONENTS

TEST PROCEDURE

RESULTS

HIGH VOLTAGE TRANSFORMER (Wire leads removed)

FILAMENT

WINDING

PRIMARY

TERMINAL

1.Measure the resistance. (Ohm-meter scale: Rx1 and Rx100)

• Primary winding	Approx.: 0.2 ~ 0.4 ohm
• Secondary winding	Approx.: 60 ~ 90 ohm
• Filament winding	Less than: 1 ohm
2. Measure the resistance.
(Ohm-meter scale: Rx1000)
• Primary winding to ground	Normal: Infinite
• Filament winding to ground	Normal: Infinite

MAGNETRON

(Wire leads removed)

1.	Measure the resistance.
	(Ohm-meter scale: Rx1)	Normal: Less than 1 ohm
	• Filament terminal
2.	Measure the resistance.
	(Ohm-meter scale: Rx1000)	Normal: Infinite
	• Filament to chassis

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GE LMAB1240ST service manual Component Test Procedure, Cautions, Components, Results

Contents

MODEL: LMAB1240ST BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUALP/NO 3828W5S5057 MICROWAVE OVENMICROWAVE RADIATION SAFETY PRECAUTIONSSERVICE INFORMATION CONTENTSPage MODEL SPECIFICATIONSBack Side DESCRIPTIONNEVER put iron tools on the magnetron CAUTIONSNEVER operate the oven with no load NEVER injure the door seal and front plate of the oven cavity10cm INSTALLATIONINSTALLING GROUNDING INSTRUCTIONSOPERATING INSTRUCTIONS FEATURESCONTROL PANEL 3. EZ ON 1. SETTING THE CLOCK2. CANCEL FUNCTION OPERATING SEQUENCESCHEMATIC DIAGRAM I *Check the Rating Model No SCHEMATIC DIAGRAM II *Check the Rating Model No. ADD Noise filter WHEN THE DOOR IS OPENED DURING COOKING WHEN SELECTING COOKING POWER LEVEL AND TIMEWHEN TOUCHING THE START PAD WHEN THE OVEN IS SET AT ANY LEVEL EXCEPT MAXIMUMMICROWAVE LEAKAGE TEST SERVICE INFORMATIONIf the oven operates with the door open, the service personnel should TOOLS AND MEASURING INSTRUMENTSWARNING AVOID CONTACTING ANY HIGH VOLTAGE PARTS NOTES WHEN MEASURINGWhen you remove the screws, use MEASUREMENT WITH OUTER CASE REMOVEDC. CONTROL PANEL ASSEMBLY MEASUREMENT OF MICROWAVE POWER OUTPUTDISASSEMBLY AND ADJUSTMENT B. POWER SUPPLY CORDE. DOOR ASSEMBLY REMOVAL D. PCB ASSEMBLY REMOVALCAUTION Be careful not to damage door seal plate by screwdriver G. REMOVING THE TURNTABLE MOTOR F. MAGNETRON REMOVALK. IINTERLOCK SYSTEM I. FAN MOTOR ASSEMBLY REMOVALH. HIGH VOLTAGE TRANSFORMER REMOVAL J. HIGH VOLTAGE CAPACITOR AND DIODE REMOVALTEST PROCEDURE A. PRIMARY INTERLOCK SWITCH TESTB. SECONDARY INTERLOCK SWITCH TEST C. MONITOR SWITCH TESTCOMPONENTS COMPONENT TEST PROCEDURETEST PROCEDURE CAUTIONSCOMPONENTS TEST PROCEDURERESULTS RESULTS 5-10TEST PROCEDURE COMPONENTSREMEDY TROUBLE SHOOTINGCONDITION CAUSECONDITION CHECKRESULT 5-12CHECK RESULT5-13 CONDITIONREMEDY CONDITIONCHECK CAUSECHECK NOTE Make sure the wire leads correct position5-15 CONDITIONOVEN CAVITY PARTS INTERIOR PARTS BASE PLATE PARTS LATCH BOARD PARTS EXPLODED VIEWINTRODUCTION DOOR PARTS13581A 15006A 13552A 13536A 13213A 13551A 13352A 14026A 14970A DOOR PARTS24781M 24930D 23551A 23550D WTP018 24510L 24970A 23551B CONTROL PANEL PARTSWSZ185 WTT010 33390G 35889A OVEN CAVITY PARTS33112U 33052A 36549SWSZ085 466001 43500A LARCH BOARD PARTS50FZZA INTERIOT PARTSModel LMAB1240ST WSZ00256549F WTT037 WTT028 WEB001 55900A56324A 35012A WSZ002 56201A948502 BASE PLATE PARTS63302A56170D 63303A WTT021