Brand: SANYO
Category: Microwave Oven
Document Type: Manual
Language: EN
Manual for EM-U1000W/B
Uploaded: Nov. 21, 2025, 8:11 p.m.
Warranty Information
None
The microwave oven operates by converting electrical energy into microwave energy, which heats food by causing water molecules to vibrate. The key components include the magnetron (generates microwaves), high voltage transformer and rectifier (steps up and converts voltage), cooling system (prevents overheating), and the electric control system (manages operation). Safety features like interlock switches prevent operation with the door open. The manual details the structure, working principles, disassembly/assembly of parts, breakdown analysis, and repair methods.
Troubleshooting and error codes
| PHENOMENON | CAUSE | REPAIRING MEANS |
| 1. When starting the oven, the lamp is not on, the turntable tray can't rotate and the food can't be heated | 8A fuse broken. The primary and secondary winding of the transformer are short - circuited. The earthing or the polarity of the polarity of the capacitor is punctured. The pilot switch can't cut off. The interlock switch hasn't closed. The power plug and the socket are not in good connection. The door hook broken. |
Change a new fuse. Change a new transformer. Change a new capacitor. Change a new pilot switch. Change a new interlock switch. Adjust the connection or replace it by a new one. Change a new hook. |
| 2.When starting the oven, the lamp is on, the turntable rotating, the fan cycling but the food can't be heated. | The primary and secondary winding, the filament of the transformer are open circuit-ed. The magnetron filament is open – circuited, the magnetic steel of the magnetron broken or the magnetron is air leaking. Time and power distributor broken. The plugs of the magnetron or the capacitor loosed. |
Change a new transformer. Change the magnetron. Change the time power distributor or the micro-switch. Fix them. |
| 3. The food can be heated, but the lamp is not on | The lamp broken. The plug falls off. |
Change a new lamp Insert the plug again |
| 4. The food can be heated but the turntable tray is not rotating. | The turntable motor broken The plug fall off Connecting shaft weave broken |
Change the turntable motor Inset the plug securely Change the weave |
| 5. The oven can heat within 2-3 minutes, but can not heat from the fourth minutes | The winding of the fan motor in open-circuited. The fan falls off The plug of the fan motor falls off The turnatable shaft is griped with the mo-tor bearin The cooling vent blocked |
1.Change the fan motor 2. Change the fan 3.Insert the plug 4.Overhauling them 5.Repairing it |
| 6. When starting the oven, it can't heat, and with "wenwen" noise. | The high voltage diode was punctured | Change a new diode |
| 7. The oven can heat, but with sound "shishi" noise | The iron core of the transformer loosed | Change a new transformer |
| 8. Large amount of microwave leakage | The door deformed The door metal net cracked The gap of the door crack is too large The welding point of the oven falls off The screws which fix the magnetron loosed |
Mend the door Change the door Adjust the gap Change the oven Tighten the screws Scrape the oxidized and |
| 9. The door can't open | The wave guide connection oxidized The magnetron copper filament washer is too thin cause the wave guide opening not in good earth. After long time using, the wear and the rust -eaten enlarged the gap of the door shaft and the shaft hole, thus cause the door crooked. The door hook broken. |
tighten the screws Thick the copper filament washer Adjust the hinge to rectify the position of the door. Change the hook. |
| 10. The door release button fall off | Worn out and aged after long time operating | Overhaul it or renew it |
| 11. Electricity leaking | The earthing insulation resistance of all the motors or the transformer are less than 2 megaohms. | Test where is the leaking place, then repair it or change those damaged components. |