Haier EA-1770M User manual

Microwave oven
SERVICE MANUAL
Models
EA-1770M
EA-1770MG
 Features
 Safe to use
The door adopts unique anti-choke structure and integrated punch forming, and thus
effectively prevents the microwave from leaking.
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.
 Shining appearance
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
becomes the best choice for the household microwave oven.
 High-temperature grill
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.
Serial Number: 0050501770 Version:00.00 Edition: 2005-11-16
Microwave oven
SERVICE MANUAL
Models
EA-1770M
EA-1770MG
 Features
 Safe to use
The door adopts unique anti-choke structure and integrated punch forming, and thus
effectively prevents the microwave from leaking.
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.
 Shining appearance
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
becomes the best choice for the household microwave oven.
 High-temperature grill
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.
Serial Number: 0050501770 Version:00.00 Edition: 2005-11-16

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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.Exploded View and List of Parts……………………………………………………24

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Product Code illumination and Series Introduction
2.Product Code illumination and Series Introduction
Model Identification
E□-□□ □□ □□□
A BC D E F G
A: E ――For Europe.
B: Appearance feature
C: Code name of Nominal cavity capacity.
22—means the cavity capacity is 22 liter,
17—means the cavity capacity is 17 liter,
24--- means the cavity capacity is 24 liter,
D: One tenth of the microwave output power consumption.
E: Code name of operation pattern: E means the operation pattern is electronic,
M means the operation pattern is mechanical.
F:Function code:G---with grill
G:Type of cavity: S—stainless steel default--painted
Examples:
EA-2O8OM
-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.
A appearance.
EB-2485EG
-It represents made for Europe electronic microwave oven with grill , the cavity capacity is
24 liter , the microwave output power consumption is 850 Watts. B

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appearance
specifications
Item Description
Model EA-1770M EA-1770MG
Power source ～230V/50Hz ～230V/50Hz
Input Power consumption 1200W 1200W
output Power consumption 700W 700W
Power consumption
For grill -------- 1000W
Oscillating frequency 2450MHz
Timing range 30’
Power level 5 6
Unit Dimension
(W×D×H)mm
345×449×259 345×449×259
Cavity Dimension
(W×D×H)mm
290×284×180 290×284×180
Carton Dimension
(W×D×H)mm
382×508×333 382×508×333
Volume/
effective volume 17L 17L
Weight(unit/carton) 12.3Kg 12.5Kg
Accessories Instruction manual ,glass tray, turn
plate-bracket groupware, turn axis
4.Specifications

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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.Please check following before operation: (1) the door lock is flexible; (2) the door
works well in opening and closing; (3) the door is sealed well (without deforming and
bending); (4) identify any damage and loosening of the components and accessories;
(5) identify damages owing to abnormal usage or dropping.
3.Please confirm that the magnetron, microwave conductor pipe and wire are installed
and connected well before switch on the power to do maintenance or check the
functional components.
4.In case that the door lock, seal gasket, microwave radiating and transmission system
are damaged, or something wrong in debugging, please make repair, replacement or
adjustment according to the requirement of this manual before usage.
Components detachable that may
touch voltage higher than 250V Components that may cause excessive microwave leakage
1.Magnetron
2.High-voltage transformer
3.High-voltage capacitor
4.High-voltage diode
5.AK rectifier
1.The magnetron is not properly installed on the
wave guide;
2.The door hook, door body and the up/down
hinge are not properly adjusted;
3.The door body or the shell is damaged;
The above reasons may cause excessive
microwave leakage.
During maintenance, the technicians shall pay attention that:
Attention
Microwave radiation
Do not expose to the radiation emitted by the microwave generator or other parts
transmitting the microwave.

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Warning and Cautions
6.Warning and Cautions

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Danger Warning
Danger
Attention
Do not use the microwave oven for purposes
other than for cooking food.
Do not cook eggs in their shell as they may
burst.
warning
Do not apply excessive force to the door.
It may cause distortion of the door and
result in microwave leakage.
warning
warning
Electric
shock
hazard
Do not use a metal rod to enter the interlock
switch hole on the front side of the cavity.
interlock switch hole
No
dismantle
Danger
This appliance must be earthed.
Remember to clear away excess grease
form the inside the cavity. Otherwise it may
cause smoke or fire during heating.
Do not use sealed containers. For those
foods with skin, please prick holes on the
skin.
warning
warning
warning
safe and
reliable
Warning and Cautions

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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.Do not touch any components and circuit when the microwave is running.
3.Be sure to switch off the power before you touch the inside structure of the oven.
4.The high-voltage capacitor may still maintain electricity even 30 seconds after the
microwave oven stops working. To make replacement or checking at this time, be sure
to use insulated screwdriver to short out the two ends of the capacitor and discharge
the stored electricity.
5.Prevent the wristwatch from touching the microwave oven.
6.Do not operate the microwave oven when there is no food or water inside.
7.Protect the seal gasket and front board of the oven door from damage.
8.Do not put metal tools on the magnetron.
9.Do not put any items into the hole of the door lock or the door lock switch.
10. Confirm that the magnetron is installed properly and firmly.
Only professional technicians can do the maintenance of this
microwave oven.

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Installation and Accessory Parts
7.Installation and Accessory Parts
7.1 Installation
attention
Do notinstall the microwave oven in
an environment that is humid or with
high temperature.
Attention
7.2 key Point In Installation Adjustment
Please read following before installation.
7.2.1 Install the microwave oven
1. Clear all of the items inside the oven, then wipe the cavity with wet soft cloth. Check if
the door is even, and if there’s damage on the inner/outer side of the door.
2. The microwave oven, the food and the cooking tools shall be placed on firm and stable
table, desk or shelf. During delivery please note that the side with control panel is much
heavier.
3. Do not block the ventilation hole and air inlet. Otherwise it may damage the oven or
cause poor cooking. Confirm that the oven shelf is placed properly to guarantee the
ventilation.
4. Avoid high temperature and vapor. Protect the appliance and the mechanical part from
damages.
5. The ambient temperature shall be lower than 40℃.
6. The plane bearing the oven shall be even and firm.
7. Keep the microwave oven away from the TV, radio, computer, etc. to avoid
interference.
7.2.2 Installation of the earth wire
The microwave oven must be earthed before use. Please pay special attention on that.
Warning: This microwave oven must be earthed.
Installation and Accessory Parts