Haier Microwave HMV1632SBSS Service Manual
Contents
1. SCREW 514 1 2 514 8 HANDLE DECO D PANEL GASKET DOOR SCREW ST4 8PBHC PANEL DOOR BARRIER SCREEN 0 SHIELDER SWITCH CIRCUIT BARRIER SCREEN 55 SPRING LATCH MEMBRANE LATCH 55 DOOR FRAME DECO C PANEL PANEL CONTROL ASS Y DOOR ASS Y C PANEL Part Name Part Name Model 44 13 14 15 16 1 10 11 12 13 14 15 16 75 ASS Y Kits 1 703 Cover Lamp 2 715 Cover Cavity Lamp 1 11 ARK Holder 1 Cuide Air Magnetron 1 W05 HAERE Guide Air Outlet 1 2 Protector Air R 1 09 Cover Vent Motor 1 Motor Vent 1 WO7 ERA AER BRKT Damper 1 106 ERR Damper 1 w03 AREAL2. Bottom Plate 1 BOL Base Plate 1 BOO ASS Y Base Plate 1 ALS BRKT Thermostat 1 A00 ASS Y Cavity 1 No SEES RR part name Quantit Material or spec The exploded drawing for 706 Spacer 1 EMO44kK POOA AOL 9 Cover Wave Guide 1 74 Case Out 1 part name Quantity Material spec 1 13 13 14 15 16 8 2
3. 2 5 If the oven has been received inoperative due to the failure of the monitored safety primary and or secondary interlock s you should replace all of the monitored safety interlock switched and the monitor switch 2 6 Refer to Chapter 4 Sections and for how to remove and assemble the interlock and monitor switches 2 7 Always refer to Section 0 4 for adequate wiring diagram Monitor interlock must always be installed Repeat Step 6 2 4 to check electrical continuity 2 8 Perform required checks and tests as described in Chapter 7 before releasing the oven to the owner 6 1 3 Door and Hinge Replacement and Adjustment 3 1 3 2 3 3 3 4 Pull the power cord from the outlet Check the door for warped or damaged areas Check the hinges for broken or worn areas Check other areas such as cracked from glass broken door latched worn cracked viewing screen and etc After determining the door assembly should be replaced check the parts list for the correct part number All oven door components must be ordered directly from the manufacturer or its authorized distributor Refer to Chapter 4 Sections and for how to disassemble assemble and adjust the door and or hinge Perform required checks and tests as described in Chapter 7 before releasing the oven to the owner 4 Magnetron Replacement 4 1 4 2 Refer to Chapter 4 Section for removing and replacing the magnetron Check for the presence of the wi
4. 1 POWER SUPPLY FILTER 455 DIODE SINGLE PHASE _ Fane as ONLY N BK 120V 120V wi COOKTOP TURNTABLE LAMP MOTOR A LAMP MONITOR Se INTERLOOK SWITCH HOOD THERMAL CULLOUT _ 40 70 11 WH MAGNETRON 25 BL 24 23 GN 5 RD 22 BR 18 06 12 WH 10 BK DOOR SENSE SWITCH BOTTOM 2 boo 49 mJ 31 WH LO gt a T ON L y MAIN RELAY RELAY 1 POWER RELAY RELAY 2 VENT RELAY LAMP RELAY CONTROL W B ASS Y NOTE conprTroN 0L OVEN LAMP 0G ORANGE BR BROWN DOOR CLOSED EM FAN MOTOR YW YELLOW COOK OFF TURNTABLE MOTOR RD RED BK BLACK SM STIRRER MOTOR BL BLUE GY GREY Model cL COOKTOP LAMP GN GREEN PINK 44 SCHEMATIC DIAGRAM 2 1 THE HEATING PRINCIPLE 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 Under the affect of microwave field the thermal effect mechanism produced from the mutual affect of the microwave and the food includes two aspects One is Dielectric loss of polar molecule the other is conductive loss of ion Usually food is constitute of organism plant
5. idea MICROWAVE OVEN MODEL EM044KIT POOK 1000W 120V60Hz SERVICE MANUAL CAUTION BEFORE SERVICING THE UNIT READTHE SAFETY PRECAUTIONS IN THIS MANUAL TABLE OF CONTENTS page INTRODUCTION AND SAFETY 6 1 1 NITRODUCTION miee 1 2 SAFETY PRECAUTIONS 1 3 SCHEMATIC 2 1 HEATING PRINCIPLE 3 1 TROUBLESHOOTING 6 4 1 COMMON BREAKDOWN AND MEANS OF REPAIRING 5 1 CRITICAL PARTS 6 1 SAFETY CHECKS AND TESTS AFTER SERVING 7 1 CONSTRUCTIONAL 65 7 1 INSULATION RESISTANCE 65 7 1 MICROWAVE LEAKAGE 5 7 2 EXPLODED VIEW act 8 1 PRECAUTIONS TO AVOID POSSIBLE EXPOSURE TO EXCESSIVE MICROWAVE ENERGY A Do not attempt to operate this oven with the door open since open door operation can result in harmf
6. they both are turning the microwave energy which the heating matter got from the microwave field to hear energy From the analysis of theory we can draw such a conclusion that the power which a unit of volume matter absorbed from the microwave field as the following formula fErtg 6 Pa Stands for the power the heated matter absorbed from the microwave field K Stands for a constant E Stand for microwave field strength F Stands for the microwave frequency g 5 Stands for loss angle tangent of the heated matter E Stands for relative dielectric constant of the heated matter 3 1 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 overworking would be done when repair The microwave oven may occur compound breakdown due to all kinds of different reasons thus when overhaul they all should be taken into consideration Special attention must be given to the microwave leakage and the electric insulation when examine because they may do harmful to the repairing staff I MEANS OF THE BREAKDOWN EXAMINING How to examine a microwave oven with breakdown A better means which demonstrated in practical operating are through inspecting and listening On the basis of large amounts of perceptual knowledge you can judge and analysis the breakdow
7. and animal The organism is formed by all kinds of polar water molecule polar protein molecule and all sorts of salt ion The center of gravity of the positive and negative charge in the molecule is not coincide In normal condition the molecule is in irregular order due to its thermal action thus the food do not appear polarity FIG 1 1a Under the action of outer electric field the positive end of the polar molecule trend to the negative electric field the negative end of polar molecule trend to the positive electric field and somewhat arrange in order through the direction of the electric field FIG 1 1c This phenomenon usually be called TORQUE POLARITY When the outer electric field apply for the opposite polarity the polar molecule then arrange an opposite direction order accordingly FIG 1 1b If the direction of the outer electric field changed repeatedly the polar molecule would repeatedly sway accordingly During the swaying it understands that the polar molecule would produce heat due to somewhat similar friction among them 0222 50000 gt 2 900900 7 b 1 When the electric field is applied for ultrahigh frequent microwave field from the outside its direction would change tens billion times per second so do the molecule This kind of molecule swaying producing similar frictional heat from the interference and block of the action strength among the molecule and changed to microscopic microwave
8. the multi meter connect the cathode of diode the rod end of the multi meter connect the anode of the diode FIG 5 7 The multi meter reading should be about 150 thousand ohm Then change the rod to different electrode the reading should be lt 2 the reading is very small and near to short circuit it indicates the high voltage diode has been punctured and should be replaced by a new one Secondary winding Fig 5 8 Fig 5 9 4 2 5 If the high voltage diode is OK then check the forwarding plug of the transformer to see whether it is enough to 120v If it is not enough check the micro switch of the time and power distributor Connect the two rod of the multi meter to the 1 2 place of the timer with Rx1k grade It is normal if the reading is 0 when at cut off condition If the reading is co it indicates the micro switch has broken and the timer should be replaced by a new one If all the above examination shows normal then check whether the terminal plug of the magnetron and the capacitor have loosed if it is loosed pinch it tightly with a pliers Examine the starting and the Pull out the power plug take off the cabinet discharge the capacitor measure the resistance value of the primary winding and the secondary winding of the transformer with a multi meter FIG 5 10 and FIG 5 9 The resistance value of the primary winding should be about 2 2 ohm the secondary winding should be about 130 ohm otherwise it in
9. wear and other damage 4 Damage to or loosening of hinges and latches 5 Evidence of dropping or abuse C Before turning on microwave power for any service test or inspection within the microwave generating compartments check the magnetron wave guide or transmission line and cavityfor proper alignment integrity and connections D Any defective or misadjusted components in the interlock monitor door seal and microwave generation and transmission systems shall be repaired replaced or adjusted by procedures described inthis manual before the oven is released to the owner E The microwave leakage check to verify compliance with the Federal performance standard should be performed on each oven prior to release to the owner F Operate the oven from a properly grounded AC outlet capable of supplying THIS MANUAL AS WELL AS THE INFORMATION CONTAINED IN IT IS BE USED ONLY BY AN AUTHORIZED SERVICE TECHNICIAN FAMILIAR WITH AND KNOWLEDGEABLE OF PROPER SAFETY AND SERVICING PROCEDURES AND POSSESSING HIGH QUALITY TEST EQUIPMENT ASSOCIATED WITH MICROWAVE AND ELECTRICAL APPLIANCE REPAIR ALL INDIVIDUALS WHO ATTEMPT REPAIRS BY IMPROPER MEANS OR ADJ USTMENT SUBJ ECT THEMSELVES AND OTHERS THE RISK OF SERIOUS OR FATAL INJ URY 1 3 MGT THERMAL CUT OUT BOTTOM THERMAL CUT OUT PRIMARY 160 95 3 120 0 4 2 MOTOR CAPACITOR CAVITY THERMAL 7 CUT OUT 110 0
10. 3 Plug the oven power cord into the power receptacle 34 on the Microwave Leakage Meter and warm up for at least 10 minutes Set the meter response filter selection at FAST 8 9 Fill the glass beaker with 275 15 ml of cold water place the beaker the center of the turntable glass plate 3 6 Close the oven door Set the timer at 5 minutes Set the Power Level at HIGH 100 and start the operation 3 7 Hold by the handle portion the probe cone spacer perpendicular to the areas under test for RF emissions Move the probe at a speed of no faster than 1 inch per second The areas under test are seal 2 The area of the door screen 3 The area of control panel 4 The area near line cord 5 All vent openings 6 All cabinet seams 7 Other suspect areas 3 8 At several locations the vicinity of each high leakage point hold the probe stationary until a steady state value is reached on the Survey Meter Observe the maximum leakage at each location 3 9 Set the Meter Response to SLOW remeasure the leakage at the point of maximum leakage located in Step 7 3 8 above record the value and location of the maximum leakage measurement with the meter response on SLOW 3 10 maximum RF emission leakage should be 4 0 mW cm2 or less If not investigate and repair the oven again until it passes the test 7 2
11. Connect only to a properly grounded and polarized outlet 12 Do not immerse cord or plug in water 13 Keep cord away from heated surfaces 14 Do not let cord hang over edge of table or counter 4 Install or locate this appliance only in accordance with the installation instructions described in this manual 5 Some products such as whole eggs and sealed containers such as closed glass jars may explode and should not be heated in this oven 6 Use this appliance only for its intended use as described in manual Do not use corrosive chemicals or vapors in this appliance This type of oven is specifically designed to heat cook dry or defrost food It is not designed for industrial laboratory or commercial use It is intended for home use only Do not use for drying clothes linens newspaper or similar non food type items Make sure that all persons using this appliance especially children are closely supervised and properly instructed on how to use this appliance Do not operate this appliance if it has a damaged cord or plug if it is not working properly or if it has been damaged or dropped This appliance should be service only by qualified service personnel Contact the nearest authorized service facility for examination repair or 15 When cleaning surfaces of door and oven that come together on closing the door use only mild nonabrasive soaps or detergents applied with a sponge or soft cl
12. Motor Fan 1 1 Guide Fan 1 WOO Grille Vent 1 M2 4 1 345 103 Ring Rotating ASS Y 1 102 Coupler 1 TOl Motor Tray 1 513 BRETCT4 10WBHC SCREW CT4 1OWBHC 3 512 BRET 2467488 SCREW 4 6 2 ST4 8WBHC 51 WREJT 24 25 SCREW 4 05 2 510 1655 Y Mounting Nut 3 LOS 509 BRET 2448 Screw 438 508 2410 15 Screw 4 10 4 CT4 10HwBHC S07 5104 8 00 5 4 8 4 CT4 8TBHC 505 4104 12 5 4 12 2 ST4 12PwBHC 504 4724 10 Screw 4 10 33 8 4 10 503 41044 Screw 4 8 3 ST4 8PBHC 501 8123 Screw 3 8 3 RREN Filter Charcoal 1 Light Tape 1 105 A Harness Main 1 104 HFX Microswitch Monitor 1 103 KAFA Microswitch Interlock 2 2 82 Lever Switch 1 101 Board Latch 1 Fl4 EFRR Air Duct 1 F13 Guide Air 1 Fll Filter 011 2 TRAZA BRKT Lamp Glass 1 KT Ba Glass Lamp 1 Plate Mounting 1 E60 Capacitor Starting 1 Thermostat Vent Motor 1 E15 Thermostat V T 1 RRA Power Cord ASS Y 1 Socket Lamp 3 02 Lamp 3 Fuse 1 E10 Filter Noise 1 V Diode 1 E06 V Capacitor 1 05 H V Transformer 1 Thermostat Cavity 1 E02 Thermostat MGT 1 01 ee Magnetron 1 0 ASS Y Door 1 coo ASS Y Controller 1 F04
13. dicates the transformer has broken and should be replaced by a new one Transformer Capacitor Fig 5 11 Fig 5 10 If the transformer is normal then the high voltage capacitor should be checked Pull out the connecting plug of the capacitor and measure it with Rx1 grade of a multi meter the two rod of the multi meter connect the two polarity of the capacitor When they just connected the reading of the multi meter should be zero then enlarge to nine mega ohm slowly Change the rod to different polarity the reading repeat from zero to nine mega ohm FIG 5 11 it means the capacitor is normal If the indicator of the multi meter can t point out from zero to nine mega ohm it indicates the high voltage capacitor has broken and should be replaced by a new one If it is normal between the two pole of the capacitor then the insulation between the capacitor pole and the cabinet should be replaced by a same model same capacity one If the resistance value of the capacitor s two pole are the capacitor is normal Then check the earth of the magnetron s two filament to see whether they are short circuited FIG 5 13 If they are short circuited and the filament strikes the shell of the magnetron it indicates the magnetron has broken and should be replaced by anew same model If the magnetron is also normal then test the pilot switch Pull out the two plugs of the switch Measure it with the Rx1 grade of a multi meter t
14. e magnetron with the probe of the microwave leakage measure If the leakage is larger the oven should be turned off and check whether the four screws which fix the magnetron have been loosed if loosed twist them tightly with socket wrench If the four screws are fixedly then the magnetron should be take down to check the copper filament weaved washer of the magnetron has been placed well or whether the wave guide housing coupling has been oxidized or have lacquer on it If do have scrape the oxidized layer or the lacquer off when fix the magnetron the copper filament weaved washer must be placed well the screws must be twist tightly Then turn on the oven and measure again until it complies with the requirement If the microwave leakage is larger at those hole position of the window board the oven should be turned off to inspect whether there are crack among them FIG 5 17 If several holes formed a crack it would enlarge the microwave leakage If that is the case it indicates the door has broken and should be replaced with a new door Means of repair when the oven can heat but the turntable glass can t move Firstly check whether the turntable holder is placed correctly If it is correct then pull out the power plug and take down the turntable combination measure the resistance value of the turntable motor with Rx1k grade of a multi meter If it is open circuited it indicates the turntable motor has broken and should be replaced by a new sa
15. e primary winding of the transformer is open circuit the thermal cutout is open circuit or not you must check whether the interlock device is put through or all the plugs are connected well If short circuit occurred or the resistance less than 1 5 ohm you should check whether the primary winding of the power transformer is short circuited or part short circuited 3 Examination of microwave leakage Measure the microwave leakage with a microwave leakage Measure Place a graduate of 275ml water at the middle of the glass tray of the oven FIG 5 1 Close the door power set high time set to 3 minutes press the starting button to operate the oven After rectified the microwave leakage measure measure around the door crack those hole position of the window and the air vent at four sides of the oven with the probe of the measure When measure the moving speed of the probe should not exceed 25mm per second and the measuring direction should be the same with the outing direction of the microwave leakage FIG 5 2 When measuring the ultimate value of microwave leakage of all the measured position should not exceed 1 milliwatt cm or should be considered as abnormal 4 Examine when the oven at operating but the food can t be heated 1 Examine when the lamp is on the glass tray is cycling the fan operating in normal Take off the cabinet starting the oven measure the plug of the transformer with a multi meter to see whether it is enough to 120 1 i
16. eing cleaned the felt should be refueled fully with engine oil for when the oven is operating the engine oil empty into the oil bearing slowly Fix the bearing cover with two screws turn the fan around till it can move flexibly Than install them to the oven and plug in the two terminal plugs If the fan can move flexibly then the winding of the fan motor should be examined Measure the winding with Rx100 grade of a multi meter if it is open circuited it indicates the winding of the fan motor has broken and should be replaced by a new same model one 4 5 COMMON BREAKDOWN AND MEANS OF REPAIRING PHENOMENON CAUSE 6 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 the oven The earthing or the polarity of the capacitor is Change a new capacitor the lamp is not on the punctured 4 Change new pilot turntable tray can t rotate 4 The pilot switch can t cut off switch and the food can t be 5 The interlock switch hasn t closed 5 Change new interlock heated 6 The power plug and the socket are not in good switch connection 6 Adjust the connection or 7 door hook broken replace it by a new one 7 Change a new book 2 When starting the oven 1 The primary and secondary winding the 1 Change a new the lamp is the filament of the transformer are
17. he two rod connect the plug of the switch the resistance value should be so FIG 5 8 Then press down the pilot switch with a screwdriver if the reading of the multi meter pointed to zero it indicates the pilot switch has broken and should replace it with a new same model one METHOD OF SEVERAL BREAKDOWN 1 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 3 Obvious damage or uneven of the oven 4 There are filth between the door and the oven 5 The door and the oven are serious loosed after the door closed 6 The crack of the door shielding net cover Before repairing check whether the above listed 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 set at 3 minutes power at high makes the oven operating in normal Rectify the microwave leakage measure measure the amount of the microwave leakage around the oven with its probe If there are places which the leakage exceed the standard requirement then repair them accordingly If the leakage amount exceed mill watt cm at the left door crack then pull out
18. heating Microwave heating not only concerned the nature of the matter itself but also closely connected with the electric field strength and frequency When the frequency is low the molecule swaying rate and the acute degree of the mutual friction among the molecule is low and would produce much heat When the frequency is too high as the swing of the polar molecule is with rotating inertia it made the swing do not in line with the changing rhythm of the electric field because of the friction drag thus actually lowed the polar molecule swaying speed The friction dragging degree is concerning about the magneto electric wave frequency polar molecule shape and the matter s sticky degree To different matter s molecule there are different special frequency zone Those aho absorb microwave energy from these zone are most capable to turn microwave energy to heat energy Apart from the above said action there is another action which is electric ion under the action of microwave field act fiercely accompanied with the acceleration of electric field The positive ion transfer to the negative polarity of the field while the negative ion do opposite Accompanying with the changing electric field the electric ion changing accordingly During the transferring heat produced with the crash among the ion This kind of action take the main effect to those microwave heating of high salt molecule No matter it is the polar molecule swaying or the ion transferring
19. l off Change the oven The screws which fix the magnetron loosed Tighten the screws The wave guide connection oxidized Scrape the oxidized and The magnetron copper filament washer is too tighten the screws thin cause the wave guide opening not in good 7 Thick the copper filament earth washer 9 The door can t open After long time using the wear the 1 Adjust the hinge to rectity rust eaten enlarged the gap of the door shaft the position of the door and the shaft hole thus cause the door 2 Change the hook crooked The door hook broken 10 The door release Wore aged after long time operating Overhaul it or renew it button fall off 11 Electricity leaking The earthing insulation resistances of all the Test where is leaking motors or the transformer are less than 2 mega place then repair it ohm change those damaged componenis CRITICAL PARTS 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 1 1 If the oven is operative prior to servicing a Microwave Leakage Test Microwave Emission Check should be performed prior to servicing the oven Refer to Section 7 3 Microwave Leakage Test for the detailed check procedures 1 2 in the event that any microwave oven found to have microwave emission level in exces
20. me model one If the resistance value is between 15 22k it indicates the turntable motor is normal then check the connecting shaft weave If the plastic that the shaft insert in has broken a new shaft weave should replace it Repair when the oven can heat but the lamp is not on Pull out the power plug take down the cabinet and discharge the capacitor Pull out the two terminal plugs of the lamp measure the two plugs of the lamp with the Rx100 grade of a multi meter If it is open circuited it indicates the lamp has broken and should be replaced by a same model Fig 5 17 Means of repair when the oven stop working after several minutes operating The phenomenon indicated the thermal cutout 15 playing its protective role and you should check whether the fan is working in normal Turn off the oven pull out the power plug take down the cabinet discharge the capacitor then turn the fan with hand to see whether it is moving flexibly If not it indicates that the oil bearing of the fan motor has run off the oil and should take down the fan combination to repair the motor Loosen the two screws which fix the bearing out the shaft and the bearing and rinse them with kerosene ATTENTION The bearing can only be wiped with a silk which moistened with kerosene rather than be washed in the kerosene because there are felt on it If the felt are soaked with kerosene then the engine oil can not be sucked up After the bearing b
21. n quickly and correctly 1 Inspection Inspect whether the oven shape is disordered and where is the disordered position if any It is normal if the cabinet disordered a little but abnormal if the oven the door disordered the door hook broken the door crooked or there are too much looseness between the door and the oven after the door is closed 2 Listening Listening to the voice of the oven operating and the noise of the fan after it conducted Minor wen wen noise cycling kala noise shishi noise should be consider as normal But it is abnormal if the following noise occurred 1 Sound wenwen noise 2 Long time shishi noise 3 Strike voice like pipa EXAMINING STEPS OF THE MICROWAVE OVEN 1 Examine the microwave insulating resistance Measure the insulating resistance with a multi meter or a mega ohmmeter the value should not less than 2 mega ohm Otherwise part examination should be taken at once Such as checking whether the motor the thermal cutout the transformer or the capacitor are electricity leaking 2 Examination of the resistance value of the microwave oven Close the door set the time the oven is at operating condition but the power plug haven t been plugged in measure the two feet L N of the power plug with Rx1 grade of a multimeter the resistance value should be about 2 5 ohm If open circuit occurred then you must check whether the 8A fuse is broken th
22. open circuited transformer turntable rotating the fan 2 The magnetron filament is open circuited the 2 Change the magnetron cycling but the food magnetic steel of the magnetron broken or the 3 Change the time power havent be heated magnetron 15 air leaking distributor or the 3 Time and power distributor broken micro switch 4 The plugs of the magnetron of the capacitor 4 Fix them loosed 3 The food 1 The lamp broken 1 Change a new lamp heated but the lamp is 2 The plug fall off 2 Insert the plug again not on 4 food can be heated 1 The turntable motor broken 1 Change the turntable but the turntable tray is 2 The plug fall off motor not rotating 3 Connecting shaft weave broken 2 Insert the plug securely 3 Change the weave 5 The oven can heat 1 The winding of the fan motor in open circuited 1 Change the fan motor within 2 3 minutes but 2 The fan falls off 2 Change the fan not heat from the 3 The plug of the fan motor falls off 3 Insert the plug fourth minutes 4 The turntable shaft is griped with the motor 4 Overhauling them bearing 5 Repairing it 5 cooling vent blocked it cant heat and with wenwen noise with sound shishi noise 8 Large amount _ of The door deformed Mend the door microwave leakage The door metal net cracked Change the door The gap of the door crack is too large Adjust the gap The welding point of the oven fal
23. oth 16 To reduce the risk of fire in the oven cavity a Do not overcook food especially starchy as bacon Carefully attend appliance if paper plastic or other combustible materials are placed inside the oven to facilitate cooking b Remove wire twist ties from paper or plastic bag before placing bag in oven If materials inside the oven should ignite keep oven door closed turn oven off and disconnect the power cord or shut off power at the fuse of circuit breaker panel d Do not use the cavity for storage purposes Do not leave paper products cooking utensils or food in the cavity when not in use e Do not put metal inside the oven except as specifically described in the manual or cookbook if supplied with this oven 1 1 17 Liquids such as water coffee are able to 18 VENTILATING HOODS overheated beyond the boiling point without 1 Clean Ventilating Hoods Frequently appearing to be boiling Visible bubbling or boiling Grease should not be allowed to when the container is removed from the microwave accumulate on hood or filter oven is not always present THIS COULD RESULT 2 When flaming floods under the hood IN VERY HOT LIQUIDS SUDDENLY BOILING turn the fan on OVER WHEN A SPOON OR OTHER UTENSIL IS INSERTED INTO THE LIQUID To reduce the risk of injury to persons Do not overheat the liquid li Stir the liquid both before and halfway through heating it lil Do not use straight sided containers
24. re mesh gasket before installation Perform required checks and tests as described in Chapter 7 before releasing the oven to the owner Conduct a Microwave Leakage Test Refer to Section 7 5 at the magnetron area prior to installing the top cover SAFETY CHECKS AND TESTS AFTER SERVING Constructional Checks If mechanical or electrical electronic parts have been replaced be sure to follow the following steps 1 1 1 2 1 3 1 2 3 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 No cabinet damage Proper interlock and monitor operations Refer to Steps 6 2 2 to 6 2 4 Insulation Resistance Test If the low voltage power supply has been repaired use a 500 V Mega ohmmeter to measure the resistance between the primary Line and Neutral of the power plug and operator accessible metal parts The resistance should be no less than 2 Mega Ohms Repair the oven again when necessary Microwave Leakage Test In the event that magnetron door or hinge has been replaced or readjusted a microwave test as follows must be preferred 3 1 Test instruments required Microwave Survey Meter Holaday Model HI 1710 or equivalent 600 ml glass beaker 3 2 Precautions Turn the power off or unplug the oven immediately if the oven fails this test 3
25. s of 4 mW cm2 The following procedures should be followed a Inform the distributor importer or manufacture the finding Record itinthe logbooks well b Repair the unit at no cost to the owner c Investigate the oven and ascertain the cause of the excessive leakage d Hold the oven in your facility and instruct the owner not to use the unit until the oven has been brought into compliance 1 3 In the event that the oven operates with the door open The following procedures should be followed a Tell the user not to operate the oven b Hold the oven in your facility until it is investigated and repaired c Contact the manufacturer and CDRH FDA immediately 2 Interlock Assembly Replacement and Adjustment 2 1 If you suspect defective primary secondary or monitor interlock switches use your ohmmeter digital or analog type the check the electrical continuity 2 2 Make sure the power cord is pulled out and the high voltage capacitor is discharged before the electrical continuity check 2 3 Set the ohmmeter to Low Resistance range and connect both leads alligator clips to the switch terminals 2 4 Open the door and notice the meter reading The primary or secondary interlock switch should show an infinite resistance when the door is open Replace it when it is defective The monitor interlock should show a zero or near zero resistance when the door is open When the door is closed the readings will be opposite
26. t is enough to 120v then the secondary high voltage of the transformer should be examined as FIG 5 3 Probe of the Microwave measure 275ml Glass tray FIG 5 1 FIG 5 2 Damaged 2 Measure it with the 2500V alternating grade of model 500 multi meter One rod of the multi meter connect the iron core of the transformer the other rod connect the secondary high voltage plug FIG 5 4 The multi meter 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 one If it is enough to 2100v then check the filament voltage of the transformer with alternating 10v grade of a multi meter the value should be about 3 4v FIG 5 5 Secondary winding Fig 5 3 Fig 5 4 Fig 5 7 3 If there is no voltage at all it indicates the transformer has broken and should be replaced by a new one If it is enough to 3 4x check the filament resistance of the magnetron measure the filament plug with the Rx1 grade of a multi meter FIG 5 6 If it is open circuited it indicates the magnetron has broken and should be replaced be new one It is normal if the resistance value is very small Then check whether the magnetron steel has broken if broken replace with a new magnetron 4 If there is no problem with the magnetron check the high voltage diode then Measure the diode with Rx10k grade of a multi meter the rod end of
27. the power plug take down the cabinet adjust the screws of the hinge up and low as figure5 14 to less the gap between the door and the oven Then measure again the leakage amount should less than mill Generally it should be controlled below 0 75 mill watt cm with some allowance Fig 5 14 Fig 5 15 If the leakage occurred at the right door crack adjust the screws that fix the interlock holder and the hook If the leakage is on the larger side at the right above of the oven then adjust the upper screw as FIG 5 15 Loosen out the screw push the door close to the oven to hook the door hook with the plastic parts the tighten the screw again the leakage is larger at the right below then adjust the lower screw as FIG 5 15 Loosen the screw push the door close to the oven to hook the door hook with the switch holder tightly then tighten the screw again and open and close the door repeatedly to check whether the door can operate flexibly whether the hook and the switch are in their normal position If it is not in position 4 4 then adjust the door hook and the switch holder the loose between the door and the oven then measure the leakage with microwave leakage measure again If the leakage still exceed standard requirement then inspect whether the right oven is even or not if not smooth it Then adjust the door and the oven to eliminate their loose to the ultimate If there still exist microwave leakage measure near th
28. ul exposure to microwave energy is important to defeat or tamper with the safety interlocks B Do not place any object between oven front face and the door or allow soil or cleaner residue to accumulate on sealing surfaces C Do not operate the oven if it is damaged It is particularly important that the oven door close properly and that there is no damage the 1 Door bent 2 hinges and latches broken or loosened 3 door seals and sealing surfaces The oven should not be adjusted or repaired by anyone except properly qualified service INTRODUCTION AND SAFETY PRECAUTIONS When using electrical appliances basic safety precautions should be followed including the following WARNING To reduce the risk of bums electrical shock fire injury to persons or exposure to excessive microwave energy 1 READ ALL THE INSTRUCTIONS BEFORE USING THE APPLIANCE Read and follow the specific Precautions to avoid possible exposure to excessive microwave energy found above replacement Do not attempt to service or repair this appliance 10 Do not cover or block any openings on the appliance Do not store items on top of microwave oven if there are louvers on top of oven 11 Do not store this appliance outdoors Do not use this product near water for example near a kitchen sink wet basement or near a swimming pool and the like 3 This appliance must be grounded and properly polarized
29. with narrow necks iv After heating allow the container stand in the microwave oven for a short time before removing the container v Use extreme care when inserting a INTRODUCTION This Microwave Oven service Manual is printed in a loose leaf format Each part is divided into sections relating to a general group of components and each section is subdivided in various parts describing a particular component or service procedure The subdividing of the subject matter plus the loose leaf form will facilitate the updating of the manual as new or revised components and service procedures are introduced Each page of this service manual will be identified in the lower right hand corner and as new or revised pages are published it will be easy to keep the manual up to date by following the filing instructions on the cover letter This Service Manual is a valuable service tool and care should be taken to keep it up to date by prompt and proper filling of subsequent pages as they are issued 1 2 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 onall ovens to be serviced before activating the magnetron or other microwave source and make repairs as necessary 1 Interlock operation 2 Proper door closing 3 Seal and sealing surfaces arcing
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