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Service Guide - Page 1
Sharp Electronics Corporation
Servicing Commercial Microwave Ovens R21JC/21HT & R22GTF/R22JT
Service Guide - Page 2
Len Hahn
Senior Manager, Field Services & Support
These ovens should not be adjusted or repaired by anyone except properly qualified service personnel.
Service Guide - Page 3
Objective
This course has been designed around the R22JT Commercial Microwave Oven. While most heavy duty ovens are quite similar please refer to the R22JT only. Your have information on .
All disassembly and testing procedures refer to the specific model you are working on all four models, R21 series and R22 series.
Service Guide - Page 6
... cooking container to cool before eating. When can metal be used inside a microwave oven? a. b. d. Microwave Technologies Quiz
5. b. When you want the food not to generate more heat. Never use metal in a microwave oven. The microwave to cool before handling. c. When you want to over cook. d. When the microwave recipe calls for a "let stand" time, what is this...
Service Guide - Page 8
... door switches are repaired. d. 7 milliwatt per square centimeter. c. c. 5 milliwatt per square centimeter. How often must a microwave oven be emitted from a microwave oven? b. 3 milliwatt per square centimeter. Only if the magnetron is the maximum amount of headaches. To comply with the law, what is replaced.
10. a. d. Anytime after service. Microwave Technologies Quiz...
Service Guide - Page 14
... step-up or step-down an applied AC voltage
•The High Voltage transformers that are used in microwave ovens are the step up type
Input= 120 volts
Secondary
Output= 2400 volts
•The 22JT employs two 1:20 step up transformer which outputs 20 volts for every volt applied to the primary
•...
Service Guide - Page 23
Magnetron temp fuse open = Check for proper venting for oven.
3. This unit is susceptible to get set to run without food load.
2. Oven temp fuse open = Check magnetron venting and timer operation. Monitor fuse open = Check primary and cook relay, replace monitor fuse and secondary switch. R21JCA Trouble shooting tips
1.
Service Guide - Page 26
R22/25JT Disassembly Procedures
Units can be separated by
removing the fixing angle
before servicing. In this case, the units need to be stacked for some restaurant applications.
Service Guide - Page 27
You can be seriously INJURED or KILLED from the High Voltage circuit inside the Microwave Oven
Disconnect AC Power and discharge the HV circuit before servicing CRITICAL SAFTEY WARNING
WARNING!
Service Guide - Page 50
EE4 = Voltage is too high
EE5 = Voltage is set incorrectly.
Note: The oven will display an EE4 or EE5 if the voltage switch is too low Always measure the line voltage before adjusting the voltage switch. R25JT Voltage Switches EE4 EE5
The R25JT utilizes Voltage Switches to select the input voltage between 208 and 230 volts, since power sources vary.
Service Guide - Page 79
Troubleshooting Using Fault Codes
Please refer to the following fault code tables in the respective Service Manuals to further troubleshoot each model: R22JT Page 11 R25JT Page 12 R21JCA Does not use fault codes
Service Guide - Page 89
... primary interlock relays on the control panel, latch hook ass'y, and secondary interlock switches can cause the following error codes. These error codes usually display within 9 to 13 seconds from when the cook cycle has started: EE1: magnetron 1 failure EE2: magnetron 2 failure EE3: magnetron 1 and 2 failure
Refer to page 11 in R22JT service manual for complete troubleshooting chart
Service Guide - Page 92
If 120 volts or AC line input voltage is measured at the primary, would indicate that the problem would be strictly a H.V. The control circuits would be operating normally with AC voltage present. Troubleshooting EE1 and EE2
2. or magnetron issue. transformer and measure for 120v AC.
Remove primary wires from H.V.
Service Guide - Page 93
Troubleshooting EE1 and EE2
3. which includes the control panel, secondary interlock switches and latch hook ass'y. If 120 volts or AC line input voltage is not measured at the primary, the problem would be the control circuits;
Service Guide - Page 109
Sharp Electronics Corporation
This concludes our commercial
microwave training
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