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Haier EA-1770M Service Manual
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Haier EA-1770M Service Manual

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Download this manual See also: Instructions for Use Manual
Microwave oven
Microwave oven
SERVICE MANUAL
SERVICE MANUAL
Features
Features
Safe to use
Safe to use
The door adopts unique anti-choke structure and integrated punch forming, and thus
The door adopts unique anti-choke structure and integrated punch forming, and thus
effectively prevents the microwave from leaking.
effectively prevents the microwave from leaking.
It is controlled by two-step interlock switch.The power will be switched off automatically
It is controlled by two-step interlock switch.The power will be switched off automatically
when the door is open,therefore it is much safer to use.
when the door is open,therefore it is much safer to use.
Shining appearance
Shining appearance
The door shell and operation panel frame shell adopt imported high-quality stainless steel material,
The door shell and operation panel frame shell adopt imported high-quality stainless steel material,
and will never get rust and change color. It has modern appearance and superior quality,and thus
and will never get rust and change color. It has modern appearance and superior quality,and thus
becomes the best choice for the household microwave oven.
becomes the best choice for the household microwave oven.
High-temperature grill
High-temperature grill
It has two-step grill function ,and can grill food quickly and high-efficiently.It has
It has two-step grill function ,and can grill food quickly and high-efficiently.It has
two-step''microwave+grill"combined grill function, and can produce perfect grill food.
two-step''microwave+grill"combined grill function, and can produce perfect grill food.
Serial Number: 0050501770
Serial Number: 0050501770
Version:00.00
Version:00.00
Models
Models
EA-1770M
EA-1770M
EA-1770MG
EA-1770MG
Edition: 2005-11-16
Edition: 2005-11-16

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Summary of Contents for Haier EA-1770M

  • Page 1 Microwave oven Microwave oven SERVICE MANUAL SERVICE MANUAL Models Models EA-1770M EA-1770M EA-1770MG EA-1770MG Features Features Safe to use Safe to use The door adopts unique anti-choke structure and integrated punch forming, and thus The door adopts unique anti-choke structure and integrated punch forming, and thus effectively prevents the microwave from leaking.

  • Page 2: Table Of Contents

    Contents Contents 1. Contents……………..…………………………………………………………………1 2. Product Code illumination and Series Introduction……………………...…...2 3. Specifications……..…………………………………………...………………….3 4. Safety Precaution…………………………………………..………………………4 5. Warning and Cautions……………………………………………………………..5 6. Installation and Accessory Parts…………………………………………………8 7. Parts and Functions………………………………………………………………..10 8. Maintenance Service and Trouble Shooting…………………………………...11 9. Circuit Diagram and Circuit Explanation………………………………………..22 10.

  • Page 3: Product Code Illumination And Series Introduction

    It represents made for Europe mechanical microwave oven without grill , the cavity capacity is 20 liter , the microwave output power consumption is 800 Watts. A appearance. EA-1770M It represents made for Europe mechanical microwave oven without grill , the cavity capacity is 17 liter , the microwave output power consumption is 700 Watts.

  • Page 4: Specifications

    Item Description Model EA-1770M EA-1770MG ～230V/50Hz ～230V/50Hz Power source Input Power consumption 1200W 1200W output Power consumption 700W 700W Power consumption -------- 1000W For grill Oscillating frequency 2450MHz Timing range 30’ Power level Unit Dimension 345×449×259 345×449×259 (W×D×H)mm Cavity Dimension 290×284×180...

  • Page 5: Safety Precaution

    Safety Precaution 5.Safety Precaution Only professional technicians can do the maintenance. Please refer to the proper maintenance procedures in the service manual for safe operations, so as to avoid unexpected injury. Points of attention during maintenance: 1. Do not operate the microwave oven while the door of the oven is open. 2.

  • Page 6: Warning And Cautions

    Warning and Cautions 6.Warning and Cautions - 5 -...
  • Page 7 Electric Attention Danger shock Warning dismantle hazard Do not use a metal rod to enter the interlock switch hole on the front side of the cavity. interlock switch hole Danger Danger Do not use sealed containers. For those Do not apply excessive force to the door. foods with skin, please prick holes on the It may cause distortion of the door and skin.
  • Page 8 - 7 -...
  • Page 9 Warning and Caution POINTS OF ATTENTION Not like the other household appliances, the microwave oven is a kind of high-voltage appliance. Although common operations will not risk the user in hazard, please operate it carefully. 1. Do not use duplex receptacle in usage and maintenance. 2.

  • Page 10: Installation And Accessory Parts

    Installation and Accessory Parts 7.Installation and Accessory Parts 7.1 Installation Do notinstall the microwave oven in an environment that is humid or with high temperature. attention Attention 7.2 key Point In Installation Adjustment Please read following before installation. 7.2.1 Install the microwave oven 1.
  • Page 11 Hint: Connect the wires as indicated below: The yellow/green wire is earth wire; the blue wire is null wire; the brown wire is live wire. If the colors of the wires are not in accordance with the power source terminals, please operate as per below: Connect the yellow/green wire to the wire marked with “E”...
  • Page 12 Installation Environment Ventilation space is required in installation Do not install the microwave oven in environment that is humid or with high of the microwave oven. temperature. attention attention Open the Package Carton* Installation Open the user's baking mesh carton manual glass rotary tray card...

  • Page 13: Parts And Functions

    Parts and Functions 8.Parts and Functions name of part wave guide cover cavity Door contro panel hole of door hook door seal door hook (only for EA-1770MG) baking mesh glass rotary tray tray support turn axis diagrammtic sketch for the accessory installation - 12 -...

  • Page 14: Maintenance Service And Trouble Shooting

    Maintenance Service and Trouble Shooting 9.Maintenance Service and Trouble Shooting 9.1SERVICE GUIDE AND REPLACING PARTS 9.1.1 Tools and gauges 9.1.2 Necessary tools 9.1.3 Necessary gauges Generally, the tools used in maintenance of (1) Universal meter the TVs are suitable for the maintenance of (2) Microwave leakage detector: the microwave oven.
  • Page 15 Maintenance Service and Trouble Shooting measured part. 9.3 Installation and adjustment 9.2. Checking under decomposed condition A. Dismantle the shell ①Switch off the power. In replacing the magnetron, after all the Parts are replaced and measured, and before ②First loosen the rear screw. Take the shell is installed, check the energy leakage off the shell towards upper rear of the microwave oven.
  • Page 16 year. down hinge with cross screwdriver. Maintenance Service and Trouble Shooting ②Pull up the door towards you to take off it. Attention: After installation of the oven door, please check if the first/second lockout switch and monitoring switch work well. After oven door is installed, check the leakage with leakage detector.
  • Page 17 Attention: Be sure to discharge the high-voltage capacitor to do dismantling immediately after working. H: Dismantling of the duct and lamp (1) Cut off the connecting wire of the lamp (2) Loosen the screw fixing the duct and the magnetron (3) Open the hook at the middle of the duct connecting to the magnetron installation board with a screwdriver (4) Move outward slowly to take out the duct...
  • Page 18 (3) Take off the timer from the rear of the switch on the computer board. control panel. (3) Take off the computer board from the rear of the control panel. L: Dismantling of the lockout device 1. Function of the lockout mechanical structure: The door lockout is a special design to stop the microwave emission completely when the door is open, so that it can prevent the hazard of microwave leakage.
  • Page 19 When the door is open, the first/second lockout switch is off. The monitoring switch is on. When the door is close, the switches are in counter mode. You can observe by sight. If you are not sure, please measure with gauges. In maintenance, pull the door with hands as slowly as possible to see if the microswitches act in following turn: in opening: the first lockout switch –...
  • Page 20 Item Position Normal value Two ends of the heater About less than 1Ω antenna shileding lamp terminal End and shell of the Infinite heater Attention: In test of the magnetron, confirm that the gasket is in good condition and installed well. Test of the high-voltage capacitor Under normal condition: 1.
  • Page 21 H. Measurement of the AK rectifier Under normal condition, it is infinite to measure in two condition. Attention: If the fuse is burned out, it is probably breakdown by the AK rectifier. Please first replace that part then do the test. Note that the direction shall be correct.
  • Page 22 FILTER FUSE L(OUT) L(IN) FILTER 1.5mH 2200P/400 N(OUT) N(IN) 0.33UF/275 2200P/400V DELAY CIRCUIT relay R1 100Ω TAPI Maintenance Service and Trouble Shooting 9.5. Trouble-Shooting In case that there are complaints from the customers, please study the reported troubles carefully. For the problems listed below, please introduce the proper usage to the customers to avoid necessary troubles.
  • Page 23 The oven doesn’t work reason: A. The power terminal box has too many plugs and over load, Avoid sharing one line with other electric appliances. B. The power plug is not tightly inserted, Confirm the plug is inserted tightly. The microwave output power consumption is too low reason: A.
  • Page 24 Trouble 2The lamp and the fan motor work normally, But there’s no microwave emission(no other abnormal phenomenon) 1.Check the conduction of the power switch of the timer ,if abnormal, the timer has trouble ,replaced it. 2.Cut off the connecting wire of the microwave relay, and check the conduction of it. If not conduct ,the control panel has trouble, replaced it.

  • Page 25: Circuit Diagram And Circuit Explanation

    Trouble 6:After starting, the noise of the oven is too large. Dismantle the shell to see 1. if the fan bumps other parts ,The fan rotates with high speed, and cause the loose parts vibrate and make noises. 2. The electromagnetic field attracts the shell to vibrate and bump other parts to make noises. Increase the thickness of the sponge strip or shock-resistance rubber to avoid the vibration of the shell.
  • Page 26 Circuit description: 1. The Plug L(B)&N(G) is used to supply power for the control panel, at the same time offers the access for the lamp, the tray motor and the fan motor. 2. After the door is opened, the monitoring switch will close. The first and second lockout switches will open to guarantee that the microwave oven will not work during the door is open.
  • Page 27 When the load is not full, the relay will control the transformer power sources to make the magnetron work intermittently. The fan motor is to cool the magnetron and transformer. The tray motor is to improve the thermal evenness. 5. The magnetron thermostat is a protective device used to prevent the fan from locking, and protect the magnetron from too high temperature.
  • Page 28 Microwave Oven Model: EA-1770M KNOCK-DOWN DRAWINGS FOR INDOOR UNIT Exploded View(EA-1770M)
  • Page 29 PRICE Parts code parts name (Euro) 0050600036 ST4*12 BOLT 0050100528 OUTER CASING 0050600022 ST4*8 BOLT 0050801247 CAVITY ASSY 0050400710 FILTER 0050400373 FAN MOTOR 004HR2501G ST4*19 BOLT 0050600036 ST4*10 BOLT 0050201495 FLARE 0050201517 0057100103 MAGNETRON 0050600036 ST4*10 BOLT 0050201492 CHAIN-SWITCH HOLDER GROUP 0050400605 MOCROMOTION SWITCH 0050400604 MOCROMOTION SWITCH 0050600036 ST4*10 BOLT...
  • Page 30 0050400707 WIRING HARNESS 0057109123 ST3*8 BOLT 0050400489 THERMOSTAT 0050400480 AK rectifier 0056200109 LAMP...
  • Page 31 Microwave Oven Model: EA-1770MG KNOCK-DOWN DRAWINGS FOR INDOOR UNIT...
  • Page 32 PRICE Parts code parts name (Euro) Remarks 0050600036 ST4*10 BOLT 0050100528 OUTER CASING 0050600022 ST4*10 BOLT 0050801530 CAVITY ASSY 0050400710 FILTER 0050400373 FAN MOTOR 004HR2501G ST4*19 BOLT 0050600036 ST4*10 BOLT 0050201495 FLARE 0050201517 FAN 0057100103 MAGNETRON 0050600036 ST4*10 BOLT 0050201492 CHAIN-SWITCH HOLDER GROUP 0050400605 MOCROMOTION SWITCH 0050400604 MOCROMOTION SWITCH 0057109128 ST4*12...
  • Page 33 0050600027 DOOR-HOOK SPRING 0050300098A OUTER SCREEN 0050201570 DOOR CASE 0050400385 POWER SUPPLY CORD 0050400708 WIRING HARNESS 0057109123 M3*6 BOLT 0050400489 MAGNETRON THERMOSTAT 0050600033 ST4*8 BOLT 0050100288 QUARTZ HEARTER HOLDER 0050400476 GRILL HEATER 0050400491 THERMOSTAT 0050100127 GRIDIRON 0050400480 AK RECTIFIER 0056200109 LAMP...
  • Page 34 Sincere Forever Haier Group Haier Industrial Park, No.1, Haier Road 266101, Qingdao, China http://www.haier.com - 34 -...
  • Page 35 Microwave oven Model: EA-1770M EA-1770MG Sincere Forever Haier Group Haier Industrial Park, No.1, Haier Road 266101, Qingdao, China http://www.haier.com 附件一（2/2）...

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