MENUMASTER Service COMMERCIAL MICROWAVE R OVEN This manual is to be used by qualified appliance technicians only. Maytag does not assume any responsibility for property damage or personal injury for improper service procedures done by an unqualified person. International Countertop Commercial Microwave Ovens This Base Manual covers general information. Refer to individual Technical Sheet for information on specific models.
Important Information Important Notices for Servicers and Consumers Maytag will not be responsible for personal injury or property damage from improper service procedures. Pride and workmanship go into every product to provide our customers with quality products. It is possible, however, that during its lifetime a product may require service.
Table of Contents Important Information .................................................. 2 Important Safety Information .................................... 4-8 General Information Placement of the Oven ............................................ 9 Radio Interference ................................................... 9 Earthing Instructions ............................................... 9 Microwave Oven Features ...................................... 10 Troubleshooting Procedures ......................
Important Safety Information 4 16022150 Rev.
Important Safety Information ©2003 Maytag Appliances Company 16022150 Rev.
Important Safety Information 6 16022150 Rev.
Important Safety Information ! CAUTION Read the following information to avoid possible exposure to microwave radiation: The basic design of the Amana or Menumaster microwave ovens make it an inherently safe device to both user and servicer. However, there are some precautions which should be followed when servicing the microwave oven to maintain this safety. These are as follows: 1. Always operate the unit from an adequately earthed outlet. Do not operate on a two-wire extension cord. 2.
Important Safety Information ! ! WARNING Precautions to be observed before and during servicing to avoid possible exposure to excessive microwave energy, or electrical shock disconnect power to oven. (A) Do not operate or allow oven to be operated with door open.
General Information Placement of the Oven Do not install microwave next to or above source of heat, such as a deep fat fryer. This could cause the microwave to operate improperly and could shorten the life of electrical components. Install microwave on a level countertop surface. Do not block or obstruct oven filter. Allow access for cleaning. All air vents must be kept clear during cooking. If air vents are covered during operation the oven may overheat.
General Information Plug Receptacle Plug Receptacle 230 V / 13 AMP 230 V / 16 AMP Equipment requires a 230 VAC, 50 Hz, 13 amp power supply Equipment requires a 230 VAC, 50 Hz, 16 amp power supply Do not use a extension cord. If the product power cord is too short, have a qualified electrician install a three-prong receptacle. This unit should be plug into a separate 230 VAC / 50 Hz power supply.
Troubleshooting Procedures When you get a complaint from customers, evaluate the complaint carefully. If the following symptoms apply, instruct the customer in the proper use of the microwave oven. This can eliminate an unnecessary service call. ! CAUTION • • • • Verify proper earthing before checking for trouble. Be careful of the high voltage circuit. Discharge the high voltage capacitor.
Troubleshooting Procedures Trouble 1: The following visual conditions indicate a probable failed control circuit. 1. Incomplete segments. • Segment missing. • Partial segment missing. • Digit flickering (Note: Slight flickering is normal.) 2. Colon does not turn on or blink. 3. A distinct change in the brightness of one or more numbers in display. 4. One or more digits in the display are not lighting. 5.
Troubleshooting Procedures (Electronic Models) Trouble 2: Oven does not operate at all, display window does not display any digits, and no input is accepted. Fuse blows. Check continuity of monitor switch with door closed. Continuity Malfunction of the monitor switch. Replace the fuse, primary, secondary, monitor switches and controller. No Continuity Replace fuse Check continuity of primary switch with door opened. Continuity Malfunction of primary switch.
Troubleshooting Procedures (Electronic Models) Trouble 3: Display shows all digits programmed, but does not start cooking when the START pad is pressed. Check continuity of secondary switch with door closed. Time does not count down after START pad is pressed. No Continuity Malfunction of secondary switch. Replace the secondary switch. Continuity Check connection between CN1 connector and controller. Continuity Failed controller. Replace controller. No Continuity Loose connection.
Troubleshooting Procedures (Electronic Models) Trouble 4: Output performance is low. Oven operates with little or no heat. Check the power supply voltage. Lower than 90% of rated voltage. Decrease in supply voltage under load. Normal Disconnect wire leads from relay RY2 and verify on and off times. Abnormal Failed controller. Customer must contact local power company or qualified electrician. Replace controller. Normal Measure the output power. Abnormal Failed magnetron Replace magnetron.
Troubleshooting Procedures (Electronic Models) Trouble 5: No microwave oscillation even when oven light and fan motor operate. No microwave oscillation. Disconnect wire leads from relay RY2 and verify continuity of the relay. No Continuity Check high voltage transformer. Abnormal Failed controller. Replace controller. Continuity Failed high voltage transformer. Replace high voltage transformer. Failed high voltage capacitor. Replace high voltage capacitor. Normal Check high voltage capacitor.
Component Testing Procedures ! WARNING To avoid risk of electrical shock, personal injury, or death, disconnect power to oven and discharge capacitor before servicing, unless testing requires it. Illustration Component Thermal cutout Capacitor Test Disconnect all wires from TCO. Measure resistance across terminals. Magnetron TCO .......................................... Cavity TCO .................................................
Component Testing Procedures ! WARNING To avoid risk of electrical shock, personal injury, or death, disconnect power to oven and discharge capacitor before servicing, unless testing requires it. Illustration Component Timer 7 minute Terminal 1 to terminal 2(timer switch) ...... 2 1 4 3 Test Disconnect wire from terminals. Measure resistance of the following terminals: Terminal 3 to terminal 4 (timer motor)......
Microwave Power Test Procedures ! WARNING To avoid risk of electrical shock, personal injury, or death, disconnect power to oven and discharge capacitor before servicing, unless testing requires it. Power Test (Traditional Test Method) Test equipment required is Amana power test kit R0157397 (Fahrenheit), or Menumaster power test kit M95D5 (Celsius). 1. Fill the plastic container to the 1000 ml. line with cool tap water. 2.
Microwave Leakage Testing ! WARNING To avoid risk of electrical shock, personal injury, or death, disconnect power to oven and discharge capacitor before servicing, unless testing requires it. ! WARNING Check for radiation leakage after servicing. Should the leakage be more than 4mW/cm2 inform Maytag immediately. After repairing or replacing any radiation safety device, keep a written record for future reference, as required by D.H.H.S. and HEW regulations. This requirement must be strictly observed.
Disassembly Procedures ! To avoid the risk of electrical shock, personal injury, or death, disconnect power to oven and discharge capacitors before following any disassembly procedure. WARNING High voltage is present at the high voltage terminal of the high voltage transformer during any cooking cycle. It is neither necessary or advisable to attempt measurement of the high voltage circuitry.
Disassembly Procedures ! To avoid the risk of electrical shock, personal injury, or death, disconnect power to oven and discharge capacitors before following any disassembly procedure. WARNING Door Disassembly Outer Case 1. Disconnect power to oven. 2. Remove oven door, (see "Door Removal"). 3. Begin at the bottom of the door near hinge, insert flat blade screwdriver between choke cover and outer door panel. Gently pry upward on choke cover to release tabs.
Disassembly Procedures ! To avoid the risk of electrical shock, personal injury, or death, disconnect power to oven and discharge capacitors before following any disassembly procedure. WARNING Controller Removal (Electronic Models) Timer Removal (Dial Models) 1. Disconnect power to oven and remove outer case, (see "Outer Case" procedure). 2. Remove control panel, (see "Control Panel" section). 3. Disconnect keypad ribbon connector . 1.
Disassembly Procedures ! To avoid the risk of electrical shock, personal injury, or death, disconnect power to oven and discharge capacitors before following any disassembly procedure. WARNING Interlock Switches Primary switch is operated by top latch arm. Interlock Switch Removal 1. Disconnect power to oven and remove outer case, (see "Outer Case" procedure). 2. Remove control panel, (see "Control Panel" section). 3. Test interlock switches before removing, (see testing procedures). 4.
Disassembly Procedures ! To avoid the risk of electrical shock, personal injury, or death, disconnect power to oven and discharge capacitors before following any disassembly procedure. WARNING Diode Magnetron 1. Disconnect power to oven and remove outer case, (see "Outer Case" procedure). 2. Discharge high voltage capacitor, (see "High Voltage Capacitor" section). 3. Disconnect diode from high voltage capacitor and remove screw securing diode to earth. 4. Reassemble in reverse order.
Disassembly Procedures ! To avoid the risk of electrical shock, personal injury, or death, disconnect power to oven and discharge capacitors before following any disassembly procedure. WARNING Fan Motor Light Socket / Bulb Assembly 1. Disconnect power to oven and remove outer case (see "Outer Case" section). 2. Discharge high voltage capacitor, (see "High Voltage Capacitor" section). 3. Remove rear air guide. 4. Remove screws securing diode to back panel. 5.
