TABLE OF CONTENTS clause contents page 00 Introduction and Safety precautions 1 Introduction 1 2 Safety Precautions 2 3 Exploded Views 3 4 Schematic. Diagrams 4 5 Parts List 5 1.0 Heating Principle of Microwave 5 20 Troubleshooting Procedures 7 3.0 Common breakdown and means of repairing 12 4.0 Critical Parts Servicing 13 1 important things to do prior to critical parts servicing 13 2 interlock assembly replacement and adjustment 13 3 door and hinge replacement and adjustment 13 1 magneto replace men 13 5.
INTRODUCTION This Microwave Oven Service Manual is printed in a loose leaf format. Each parts divided into sections relating to a general group of components and each section is subdivided into various parts describing a particular component or service procedure.
SAFETY PRECAUTIONS PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICING TO AVOID POSSIBLE EXPOSURE TO EXCESSIVE MICROWAVE ENERGY! A. Do not operate or allow the oven to be operated with the door open. B. Make the following safety checks on all ovens to be serviced before activating the magneto or other microwave source, and make repairs as necessary. { 1) Interlock operation (2) Proper door closing (3) Seal and sealing surfaces ( arcing, wear, and other damage ).
THE HEATING PRINCIPLE OF MICROWAVE Microwave is onc kind of radii wave otiose wavelength {s very short, frequency is very high. 'Therefore, it is called ultrahigh frequency electromagnetic wave.
TROUBLESHOOTING PROCEDURES Before overtiring a microwave oven, ‘you should judge the breakdown and ihe cause ostensibly, then you can sepals #1 with ‘Corresponding ways, The overhauling must. be proceed fn coder: any: hasty conclusion ix: not: recommendable, ‘otherwise over backlog would be done when repair, The microwave oven may occur compound breakdown due to all kinds of different encases, thus, when overhaul, they all should Ke aka into consideration.
Measure if with {he 2500 alternating grade of model S00 anemometer. Ge fod of the hectometer connect the iron core of the transformer, the other tad connect the secondary high ‘voltage: plug (FIG. S = 4). The anemometer reading should be about 2100V. (when measure; ‘be careful with the high voltage). If no voltage at all, it indicates that the transformer has broken, and should be replaced by a new ane.
1f the high voltage diode Is OK; Thea cheek the forward jag plug of the transformer (o see whether 11 Ja enough to 120, 1F iris: uot en uh. check the mics = switch of the time and power distribute. Connect the two rod of the anemometer place of the timer with RX IK grade, It is normal I the reading Ia 70” wheat at cut off conj son. Jf the reading 1s 1957 it indicates: the ironic switch has broken: aod the timer should be replaced by a new one.
there still exist microwave leakage, measure near the magneto with the probe of the microwave leakage mea: sure. If the leakage Is larger, the oven should be turned off and check whether the four screws which fix the magenta have been loosed; if loosed, twist them tightly: with socket wrench.
Flogs-13 i {6) The crack of the door shielding net cover. Before repairing. check whether the above sifted point are existed, if not, can you start the microwave oven. Place a graduate of about 275ml water at the middle of the glass tray. close the door. time get at 3 minutes. power sf high, make: the oven operating in normal: Rectify: the microwave leakage measure, ‘measure: the amount of the microwave: leakage around the oven with its probe.
COMMON BREAKDOWN AND MEANS OF REPAIRING PHENOMENON CAUSE REPAIRING MEANS 1. When starting: the ‘oven. “the lamp is: not on, the turntable tray can’ {rotate and: the: food can’ tbe heated: 1: fuse broken: 2. The primary and secondary winding of the transformer are shod = circuited. 3. The earthing or the polarity of the capacitor is punctured. 4. The pilot switch:can’t cut off. i$. The interlock switch haven i closed. 6: The ‘power plug and the socket are sot in good connection. 7. ‘The door hank broken.
