GE TMW-800T, TMW-1100EC manual Printed Circuit Board, Low voltage transformer check, Voltage Check

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PRINTED CIRCUIT BOARD

1. CIRCUIT CHECK PROCEDURE

1.Low voltage transformer check

The low voltage transformer is located on the P.C.B. Measuring condition: Input voltage: 120V / Frequency: 60Hz

Terminal Voltage	LOAD	NO LOAD

6-8	DC 12V	AC 25.8V

9-10	AC 3.4V	AC 4.0V

NOTE

1.Refer to Ciruit Diagram (point 4).

2.Secondary side voltage of the low voltage transformer changes in proportion to fluctuation of power source voltage.

3.The allowable tolerance of the secondary voltage is within ± 5% of nominal voltage.

2.Voltage Check

NO	CHECK POINT	REMARK
1	IC1 PIN 63, 64	5VDC
2	IC1 PIN 38
		5V
		0V
		T : 16.67ms(60Hz)
3	IC1 PIN 33 OR 34
		5V
		0V
		T : 250 ns(4MHz)
- Key check point

NO	MEASURE POINT	WAVE FORM	REMEDY	REMARK

1	MP1	DC 5V±0.25V	Replace Q8, ZD3, EC2	NO LOAD

2	MP2	DC 12V±2.0V	Replace D12, 13, R25, EC5, EC4	NO LOAD

- Check method

NOTE

Each measure point must be measured with GND points.

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Contents Turbo Air Inc Microwave Oven Table of Contents TMW-800T / TMW-800TC Safety and Precautions For Safe Service ProceduresFor Safe Operation Microwave RadiationSpecifications Outer Dimension Feature DiagramSafety interlock system External View ElectricalControl Panel External View Mechanical 560 483 344Installation Leave space behind and sideWattage output chart Operations and Functions ElectricalVariable power cooking Variable power setting Approximate PercentageOperations and Functions Mechanical Disassembly and Assembly ShortTo remove cabinet Part Code Part Name Description To reduce gap located on part ‘A’ REF no Part Code Part Name Description ’TY Remark Part Code Part Name Description ’TY Magnetron To remove wind guide assembly Primary interlock switch Secondary interlock switch and interlock monitor switchAdjustment Adjustment stepsTrouble Shooting Guide ConditionCheck Result CauseCheck Condition Check Result Cause RemedyCondition Check Result Relay RY1Not show Interlock Mechanism and Adjustmentmechanical No Continuity Replace power supply cord YES Procedure Heating time for power outputMeasurement and Test Microwave Radiation Test High voltage transformer High voltage capacitorHigh voltage diode MagnetronWiring Diagram TMW-1100EC Wiring Diagram TMW-1100E Wiring Diagram TMW-1100MC Wiring Diagram TMW-1100M Printed Circuit Board Low voltage transformer checkVoltage Check Check Point RemarkMP1 MP2 Measure pointPoint State Relay 2 on 5VDC GND Relay 2 OFF 12VDC Point State Relay 1 on 5VDC GNDGND 12VDC Point StateC.B. Circuit Diagram C.B. Location no Name Symbol Specification Part Code ’TY Exploded View and Parts List Electrical Total AssemblyPart Code Part Name Description QTY Exploded View and Parts List Mechanical CONTROL-PANEL AS KOR-1P55BA Power Supply Power Consumption Grill Combination Microwave Energy OutputTMW-800T / TMW-800TC Outer Dimension Feature Diagram External ViewSteady, flat location Operations and Functions Disassembly and Assembly REF no Part Code Part Name Description ’TY Page Knob Timer Coupler Timer POMKnob VPC Coupler VPC Knob POMHigh voltage circuit wiring To remove magnetron Noise FilterOnly KOR-63555B Interlock Mechanism and Adjustment Trouble Shooting Guide Does the oven lamp light? no Does the turntable turn? Measurement of the Microwave Power Output Procedures Microwave Radiation TestComponent Test Procedure Wiring Diagram TMW-800TC Wiring Diagram TMW-800T Power Supply Single Phase onlyExploded View and Parts List Total AssemblyDoor AS Control Panel ASCabinet Secc T0.5 Cavity ASAbout this Manual