Brand: SANYO
Category: Microwave Oven
Document Type: Parts/Service
Language: EN
Parts/Service for EM-SL100NUK
Uploaded: Nov. 21, 2025, 6:36 p.m.
This manual provides service and troubleshooting information for the SANYO EM-SL100NUK microwave oven. It includes specifications, adjustment procedures, power output measurement, precautions, test procedures, disassembly instructions, and exploded views of parts. Safety precautions regarding microwave energy are emphasized throughout the document.
Troubleshooting and error codes
| STEP | PROBLEM | SEQUENCE | RESULT |
|---|---|---|---|
| (1) PROBLEM No display or mis-display in the display window by touching the keys. | a | Check continuity of FUSE, Thermal Protector for cavity, Thermal Protector for magnetron and AC Power Cord. | Replace it if necessary |
| Check 230V AC power supply of connector S1 between Pin3 and Pin 5 after removing connector S1 from control circuit board. | If the fuse has blown see "D. REMOVING FUSE" on page 16 | ||
| Control Circuit Board: Check power supply voltage on control circuit board. (See page 8) | Runs | ||
| b | Check Resistance OK | Normal control circuit board | |
| Correct seating of connector S101 or replace control circuit board. | Runs | ||
| Each Voltage OK | Normal control circuit board | ||
| Check resistance of touch keyboard (See page 8) | Replace touch keyboard | ||
| Resistance is correct ON or OFF | Normal touch keyboard | ||
| Voltage incorrect | Replace control circuit board. | ||
| Normal control circuit board | |||
| (2) PROBLEM Cooking operation will not start. | a | CHECK: 1. Power Supply to Oven 2. Primary Interlock Switch 3. Thermal protector for Cavity and Magnetron | Runs |
| Check continuity of connector S102 between pins with the door closed after removing connector S102 from control cct board. | Normal Contact | ||
| Check contact of connector S102 | Poor Contact | ||
| Continuity OK | Correct Seating | ||
| No Continuity | Adjust or Replace Door Sensing Switch | ||
| (3) PROBLEM Oven does not heat up | a | Touch START key and measure voltage between the two wire leads from primary windings of H.V transformer after removing the wire leads from terminals of H.V transformer | Normal Door Sensing Switch |
| 0 Volt | 230 Volt | Replace Control Circuit Board | |
| 230 Volt | 0 Volt | Normal Control Cct, board | |
| b | Check resistance of each winding after removing lead wires. (See page 6) | Runs | |
| Resistance OK | Normal H.V capacitor, H.V diode or H.V. fuse. | ||
| Resistance Incorrect | Replace HV Transformer | ||
| (4) PROBLEM Low microwave power output. | a | Check operation of blower motor when START key is touched. | Normal H.V Transformer |
| No Operation | Temporarily short across terminals of thermal protector for magnetron or thermal protector for cavity by using jumper lead. | Runs | |
| Normal Operation | Replace thermal protector for magnetron or thermal protector for cavity. | Normal thermal protector for magnetron or thermal protector for cavity. | |
| No Operation | Measure resistance of blower motor (Approx 300 ohms) | Replace Blower Motor | |
| Normal Operation | Normal Blower Motor | ||
| Resistance incorrect | Normal control circuit board | ||
| Resistance OK | Normal control circuit board | ||
| (5) PROBLEM The magnetron operates on high level when a lower cook power is selected. | a | Set power level at low. Touch START key and measure voltage between leads for primary winding of H.V transformer after removing the wire leads from terminals of H.V transformer | No problem Measure water temperature rise exactly. |
| 0 Volt | 230 Volt | Runs | |
| 230 Volt | Replace control circuit board. | ||
| (6) PROBLEM Unit does not heat up even if display counts down when a key is touched for "Grill Cooking". | a | Check resistance of heater. Approximately 48.7Ω measured over both terminals. | Normal control circuit board |
| Normal Resistance. | Replace Heater | ||
| Resistance Incorrect. | Normal Heater | ||
| (6) PROBLEM Unit does not heat up even if display counts down when key is touched for "Convection Cooking" | a | Check resistance of heater. Approximately 46Ω measured over both tubes. | Runs |
| Normal Resistance. | Replace control circuit board. | ||
| Resistance Incorrect. | Normal Heater | ||
| (7) PROBLEM Unit operation seems to be normal but little or no heating is produced for 'Convection Cooking' | a | Check operation of convec. motor when START key is touched. | Normal control circuit board |
| Normal Operation | Normal thermal protector for magnetron or thermal protector for cavity or thermal protector for convec.. | Runs | |
| No Operation | Measure resistance of convec. motor (Approx 300 ohms) | Replace convec. motor | |
| Normal Operation | Normal convec. Motor | ||
| No Operation | Temporarily short across terminals of thermal protector for magnetron or thermal protector for cavity or thermal protector for convec. by using jumper lead. | Runs | |
| Normal Resistance | Replace control circuit board. | ||
| (9) PROBLEM Overheating even if the display window shows "160C" for preheating. | a | Check resistance of Oven Thermistor between Pin1 and Pin 3 of connector S201 after removing from control circuit board | Normal control circuit board |
| Normal Resistance. | Replace Oven Thermistor | ||
| Resistance Incorrect. | Normal Oven Thermistor | ||
| (10) PROBLEM No buzzing by touching keys and at the end of cooking | a | Check normal operation of control circuit board and power circuit board. | Runs |
| Replace control circuit board. | Normal control circuit board |