Semi-electronic
Microwave Oven
Service Manual
MK-2280M
MK-2280MG
●Features
●Safe to use
●Shining appearance
●Healthy and germicidal
●High-temperature grill Only MK-2280MG
Haier Group
Edition:2005-11- 11
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Contents
Contents
1.Contents……………..…………………………………………………………………1
2.Product Code illumination and Series Introduction ……………………...…...2
3.Features….……………………………………………………..…………………….3
4.Specifications……..…………………………………………...………………….4
5.Safety Precaution…………………………………………..………………………5
6.Warning and Cautions……………………………………………………………..6
7.Installation and Accessory Parts…………………………………………………9
8.Parts and Functions………………………………………………………………..11
9.Maintenance Service and Trouble Shooting…………………………………...12
10.Circuit Diagram and Circuit Explanation………………………………………..23
11.Exploded ViewandPartofLists ………………………………………………...29
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Product Code illumination and Series Introduction
2.Product Code illumination and Series Introduction
Model Identification
M K -□ □ □ □ □ □
A B C D E F
A: Abbreviation of Microwave Oven.
B Appearance
c: Code name of Nominal cavity capacity.
D: One tenth of the microwave output power consumption.
E Type of operation
M Mechanical E Electronic
F---Function With G Grill function
Examples:
MK-2280MG
It represents mechanical microwave oven with grill function, the cavity volume is 21L, the microwave output power is 800w, K appearance.
MK-2280M
It represents mechanical microwave oven without grill function, the cavity volume is 22L, the microwave output power is 800w, K appearance.
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Features
3.Features
3.1 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.
3.2 Shining appearance
The door shell and operation panel frame shell adopt in ported 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.
3.3 Healthy and germicidal
It is produced with antiseptic materials, and can suppress the reproduction of the bacteria effectively. The special function of the microwave oven can eliminate the germ in the food quickly and completely.
3.4 Simple operation and accurate time counting
With two knobs, one for adjusting time and another for power levels, plus LED display, on which cooking time is displayed, it has feature of simple operation of mechanical microwave oven as well as accurate time counting of electronic microwave oven.
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Specifications |
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4.Specifications |
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Item |
Description |
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Model |
MK-2280M |
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MK-2280MG |
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Power source |
230V/50Hz |
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230V/50Hz |
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Input Power consumption |
1300W |
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1300W |
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output Power consumption |
800W |
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800W |
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Power consumption |
-------- |
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1000W |
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For grill |
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Oscillating frequency |
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2450MHz |
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Timing range |
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30’ |
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Power level |
4 |
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4 |
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Unit Dimension |
486×370×288 |
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486×370×288 |
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(W×D×H)mm |
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Cavity Dimension |
302×318×221 |
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302×318×221 |
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(W×D×H)mm |
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Carton Dimension |
538×394×350 |
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538×394×350 |
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(W×D×H)mm |
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Volume/ |
22L |
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21L |
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effective volume |
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Weight(unit/carton) |
14Kg |
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14.5Kg |
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Accessories |
Instruction manual, |
glass tray, turn |
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plate-bracket groupwaregl, turn axis |
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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 |
Components that may cause excessive |
touch voltage higher than 250V |
microwave leakage |
1. Magnetron |
1. The magnetron is not properly installed on the |
2. High-voltage transformer |
wave guide; |
3. High-voltage capacitor |
2. The door hook, door body and the up/down |
4. High-voltage diode |
hinge are not properly adjusted; |
5. H.V. FUSE |
3. The door body or the shell is damaged; |
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The above reasons may cause excessive |
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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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Safety Precaution
Attention: The mark must be exactly lined up with a power level. Otherwise there is a continuous beep tone indicating microwave can’t work properly.
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Warning and Cautions
6.Warning and Cautions
Danger |
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Attention |
Electric |
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No |
Warning |
shock |
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dismantle |
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hazard |
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Do not use a metal rod to enter the interlock |
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switch hole on the front side of the cavity. |
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interlock switch hole |
Danger |
Danger |
Do not apply excessive force to the door. It may cause distortion of the door and result in microwave leakage.
warning
Do not use sealed containers. For those foods with skin, please prick holes on the skin.
warning
Do not cook eggs in their shell as they may burst.
Remember to clear away excess grease form the inside the cavity. Otherwise it may cause smoke or fire during heating.
warning |
warning |
Do not use the microwave oven for purposes other than for cooking food.
warning
This appliance must be earthed.
safe and reliable
warning
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Warning and Cautions
When roasting, the face of the door and the top of the cabinet may become hot to touch.
Do not use the microwave with the cavity empty. It will damage the microwave oven.
warning |
warning |
Do not use metallic dishware to cook as it will cause internal arcing.
warning
Allow the cavity to cool after long cooking processes (i.e. Roasting) before starting another cook cycle.
warning
Waring
1.If the door seal or the door body is damaged, please do not use the appliance until it is repaired by an authorised service agent.
2.Before use, please check if the cooking containers are suitable for the microwave oven.
3.If you find smoke in the oven, leave the door in the closed position, and switch off the power supply of the microwave (remove the plugtop from the supply socket).
4.We do not recommend the use of plastic, paper or other combustible containers for cooking, Please be sure to observe the operating instruction for the microwave oven, in order to avoid accidents.
5.When you heat liquid in the oven, please take care of delayed bubbling because of boiling liquid.
6.Do not use the microwave oven if there is no food inside.
7.
Do not use product for any industrial and commercial purpose.
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Warning and Caution
1 Baby food or drink should be shaken or stired evenly so that the heat is distributed and may only be handed to your child after having checked the temperature of the food or drink.
2 .Never put combustible materials near the microwave oven. Watch the cooking condition while the microwave oven is working. Set cooking time correctly, for over time setting may cause fire.
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
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.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.
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