Table of Contents
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CHAPTER 1. CAUTIONS
CHAPTER 2. PRINCIPLES OF MICROWAVE
CHAPTER 3. THE HEATING PRINCIPLE OF MICRO-
WAVE
CHAPTER 4. INSTALLATIONS
CHAPTER 5. SCHEMATIC DIAGRAM
CHAPTER 6. CIRCUIT DESCRIPTION
CHAPTER 7. TOOLS AND MEASURING INSTRUMENTS
CHAPTER 8. MICROWAVE
SERVICE MANUAL
CONTENTS
LEAKAGE
TEST
SHARP CORPORATION
MICROWAVE OVEN
MODEL
(1100W 120V 60Hz)
In interests of user-safety the oven should be restored to its
original condition and only parts identical to those specified
should be used.
CHAPTER 9. MEASUREMENT OF MICROWAVE
POWER OUTPUT
CHAPTER 10. TROUBLE SHOOTING PROCEDURES
CHAPTER 11.
COMMON BREAKDOWN AND MEANS OF
PREPARING
CHAPTER 12. IMPORTANT THINGS TO DO PRIOR
CRITICAL PART SERVICING
CHE
CHAPTER 13. SAFETY
SERVICING
CHAPTER 14.
EXPLODED VIEW
Parts List
This document has been published to be used
for after sales service only.
The contents are subject to change without notice.
SMC1452CH
CKS AND TESTS AFTER
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Related Manuals for Sharp SMC1452CH
Summary of Contents for Sharp SMC1452CH
- Page 1 SERVICE MANUAL MICROWAVE OVEN SMC1452CH MODEL (1100W 120V 60Hz) In interests of user-safety the oven should be restored to its original condition and only parts identical to those specified should be used. CONTENTS CHAPTER 1. CAUTIONS CHAPTER 9. MEASUREMENT OF MICROWAVE POWER OUTPUT CHAPTER 2.
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Page 2: Safety Precautions
SAFETY PRECAUTIONS This device is to be serviced only by properly qualified service personnel. Consult the service manual for proper service procedures to assure continued safety operation and for precautions to be taken to avoid possible exposure to excessive microwave energy. PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICING TO AVOID POSSIBLE EXPOSURE TO EXCESSIVE MICROWAVE ENERGY... -
Page 3: Table Of Contents
TABLE OF CONTENTS （page） SAFETY PRECAUTIONS------------------------------------ ------Inside front cover --------------- CAUTIONS------------------------------------------------------------------------------------------------1-1 THE HEATING PRINCIPLE OF MICROWAVE--------------------------------------------------2-1 INSTALLATIONS----------------------------------------------------------------------------------------3-1 OPERATING INSTRUCTIONS----------------------------------------------------------------------4-1 SCHEMATIC DIAGRAM--------------------------------------------------------------------------4-1 CIRCUIT DESCRIPTION-------------------------------------------------------------------------4-2 SERVICE INFORMATION-----------------------------------------------------------------------------5-1 TOOLS AND MEASURING INSTRUMENTS------------------------------------------------5-1 MICROWAVE LEAKAGE TEST----------------------------------------------------------------5-2 MEASUREMENT OF MICROWAVE POWER OUTPUT---------------------------------5-3 TROUBLE SHOOTING PROCEDURES------------------------------------------------------5-4 COMMON BREAKDOWN AND MEANS OF REPAIRING-------------------------------5-9 IMPORTANT THINGS TO DO PRIOR TO CRITICAL PART SERVICING-------------------------5-10 SAFETY CHECKS AND TESTS AFTER SERVICING-------------------------------------5-11... -
Page 4: Cautions
CAUTIONS Unlike other appliances, the microwave oven MICROWAVE RADIATION is a high-voltage and high-current equipment. Though it is free from danger in ordinary use, Personnel should not be exposed to the extreme care should be taken during repair. microwave energy which may radiate from the magnetron or other microwave generating device if it is improperly used or connection. -
Page 5: The Heating Principle Of Microwave
THE HEATING PRINCIPLES OF MICROWAVE Microwave is one kind of radio wave whose wave length is very short, frequency is very high. Therefore, it is called ultrahigh frequency electromagnetic wave. Microwave can heat food mainly result in the mutual affect of the food in the microwave field and microwave field itself. -
Page 6: Installations
INSTALLATIONS BEFORE YOU BEGIN, READ THE FOLLOWING INSTRUCTIONS COMPLETELY INSTALLING EARTHING INSTRUCTIONS 1. Empty the microwave oven and clean the inside with This microwave oven is designed to be used in a fully a soft, damp cloth. Check for damage such as earthed condition. -
Page 7: Schematic Diagram
SCHEMATIC DIAGRAM HIGH VOLTAGE TRANSFORMER... -
Page 8: Circuit Description
CIRCUIT DESCRIPTION GENERAL DETAILS power of microwave oven as POWER LEVEL. • The low voltage transformer supplies the necessary WHEN THE DOOR IS OPENED DURING voltage to the micom controller when power cord is COOKING plugged in. • Both the primary switch and relay 2 are cut off primary •... -
Page 9: Service Information
SERVICE INFORMATION TOOLS AND MEASURING INSTRUMENTS NECESSARY TOOLS NECESSARY MEASURING Tools normally used for TV servicing are sufficient. INSTRUMENTS Standard tools are listed below. • TESTER(VOLTS-DC, AC., Ohmmeter) • Diagonal pliers • Microwave survey meter • Long nose pliers - Holaday HI-1710(A) •... - Page 10 MEASUREMENT WITH OUTER CASE NOTES WHEN MEASURING REMOVED • Do not exceed meter full scale deflection. • When you replace the magnetron, measure for • The test probe must be removed no faster than microwave energy leakage before the outer case is 1 inch/sec (2.5 cm/sec) along the shaded area, installed and after all necessary components are otherwise a false reading may result.
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Page 11: Measurement Of Microwave Power Output
MEASUREMENT OF MICROWAVE POWER OUTPUT • Microwave power output measurement is made with • The microwave power output P in watts is the microwave oven supplied at its rated voltage and calculated operated at its maximum microwave power setting with approximately from the following formula : a load of (1000±5) g of potable water. -
Page 12: Trouble Shooting Procedures
TROUBLE SHOOTING PROCEDURES Before overhauling a microwave oven, you should judge the breakdown and the cause correctly, then you can repair it with corresponding ways. The overhauling must be proceed in order, any hasty conclusion is not recommendable, otherwise not economical and wasting time to repair unit. The microwave oven may occur compound breakdown due to all kinds of different reasons, thus, when overhaul, they all should be taken into consideration. - Page 13 Examine the oven when operating, but the food can’t be heated Pull out the power plug, take off the outer case, discharge the capacitor, measure the resistance value of the primary winding and the secondary winding of the transformer with a multi meter (FIG.5-3 and FIG.5-4). The resistance value of the primary winding should be about 2.2 ohm, the secondary winding should be about 130 ohm, otherwise, it indicates the transfomer is defective, and should be replaced by a new one.
- Page 14 FIG.5-8 FIG.5-7 FIG5.10 FIG.5-9 Ⅲ.REPAIRING METHOD OF SEVERAL BREAKDOWN Repair when there occurred large amounts microwave leakage. There are many factors, which may cause microwave leaking. Following mentioned may be the main cause of microwave leakage: (1) The door deformed, the hinge loosed or damaged that caused the door can not close tightly. (2) The door pressing cover or the embed piece damaged or come off.
- Page 15 If there still exist microwave leakage, measure near the magnetron with the probe of the microwave leakage measure. If the leakage is larger, the oven should be turned off and check whether the 2 or 4 screws which fix the magnetron have been loosed, if loosed, twist them tightly with socket wrench.
- Page 16 MOTOR TEST PROCEDURE COMPONENTS TEST PROCEDURE RESULTS Measure the resistance. Fan Motor (Ohm-meter scale:R×100) Normal:Approx. 47Ω (Wire leads removed) ∞ Abnormal: or Several Ω Measure the resistance. Turntable Motor (Ohm-meter scale:R×1000) Normal:Approx. 3.2kΩ (Wire leads removed) ∞ Abnormal: or Several Ω NOTE: A MICROWAVE LEAKAGE TEST MUST ALWAYS BE PERFORMED WHEN THE UNIT IS SERVICED FOR ANY REASON.
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Page 17: Common Breakdown And Means Of Repairing
COMMON BREAKDOWN AND MEANS OF REPAIRING PHENOMENON CAUSE REPAIRING MEANS 1. fuse broken 1. Change a new fuse. 2. The primary and secondary winding of the 2. Change a new transformer are short-circuited. transformer. 1.When starting 3. The earthing or the polarity of the capacitor is 3. -
Page 18: Important Things To Do Prior To Critical Part Servicing
IMPORTANT THINGS TO DO PRIOR TO CRITICAL PART SERVICING The following instructions are CRITICAL to the owner’s safety. Be sure to follow all the instructions. Contact the manufacturer of distributor if you have any question. If the oven is operative prior to servicing a Microwave Leakage Test (Microwave Emission Check) should be performed prior to servicing the oven. -
Page 19: Safety Checks And Tests After Servicing
SAFETY CHECKS AND TESTS AFTER SERVING Constructional Checks If mechanical or electrical(electronic) parts have been replaced be sure to follow the following steps. Check for correct wiring, adequate mechanical decrements of parts, and firm connectors. Check for adequate grounding. Check the following items before turning the oven ON. Proper door closing, seal/choke surfaces, and hinges. - Page 22 REPLACEMENT PARTS LIST NOTE: When ordering replacement part(s), please use part number(s) shown in this part list. Do not use description of the part. SMC 1452CH For Model: Ref No. Midea Part No. Part Name&Description Pcs/Set Remarks 9KL12270000026356 ASS'Y CAVITY 9KL12570000001036 SPLASH COVER 9KL12270000005139 BASE PLATE 9KL12170000000192 FOOT...
- Page 23 REPLACEMENT PARTS LIST SMC 1452CH For Model: Ref No. Midea Part No. Part Name&Description Pcs/Set Remarks 9KL17170000004595 NOISE FILTER 9KL17470000001552 FUSE 9KL17470000002369 LAMP 9KL17470000000183 POWER CORD 9KL17470000001488 THERMOSTAT 120/80℃ *H E35+A16 9KL17470000000245 ASS'Y THERMOSTAT 9KL12170000003401 LATCH BOARD 9KL12170000010256 INTERLOCK LEVER 9KL17470000002317 MICROSWITCH INTERLOCK 9KL17470000002317 MICROSWITCH INTERLOCK 9KL17470000002299 MICROSWITCH MONITOR...