Sharp R-22JT Support Question
Sharp R-22JT Support Question
Find answers below for this question about Sharp R-22JT.Need a Sharp R-22JT manual? We have 1 online manual for this item!
Question posted by gilhaidau on May 30th, 2016
How Can I Increase The Sound Of Signal?
sharp R22JTSound very weak
Current Answers
Related Sharp R-22JT Manual Pages
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
While most heavy duty ovens are quite similar please refer to the R22JT only. Your have information on . Objective
This course has been designed around the R22JT Commercial Microwave Oven. 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 4
a. b. Energy created by atomic fusion
2. What is Microwave energy? What is the frequency at which the magnetron operates? Energy created by chemical reaction. c. Energy created by nuclear radiation. Microwave Technologies Quiz
1. Energy created by electromagnetic generation d. a. 60 Hz b. 60KHz c. 2450KHz d. 2450MHz
Service Guide - Page 5
... cooked in certain foods and allows heat to the outside. d. Microwave cooking utensils do not get hot, so they draw heat from the bottom.
4. Microwave Technologies Quiz
3. c. a. Because microwave ovens cook faster, the food load cools faster. c. Microwave energy cooks food from the top. d. Microwave energy does not last as gas or electric heat energy. from...
Service Guide - Page 6
... to escape from cooking splatters. When the microwave recipe calls for a "let stand" time, what is this allowing for? d. d. c. Allows the food to protect your oven from the food. c. Microwave Technologies Quiz
5. The microwave to generate more heat. When can metal be used inside a microwave oven? a. Never use metal in a microwave oven. When you want to finish cooking...
Service Guide - Page 7
When working on a microwave oven with the cabinet removed, the technician is the danger? Radiation energy. ...high voltage and current potentials even when power is removed. check the door for RF leakage. d. Microwave Technologies Quiz
7. When working on a microwave after disconnecting the power cord from the magnetron.
8. a. c. d. The high electrical resistance within the...
Service Guide - Page 8
... complains of leakage allowed to be tested for leakage? d. Anytime after service. Only if the magnetron is the maximum amount of headaches. How often must a microwave oven be emitted from a microwave oven? c. d. 7 milliwatt per square centimeter. Only if the door or door switches are repaired. a. To comply with the law, what is replaced.
10...
Service Guide - Page 10
R-21JCA Oven diagram
Air ventilation cover and openings
Ceramic shelf Rotary antenna
Air intake openings
Service Guide - Page 12
R-21JCA Ceramic Shelf Installation
Rubber fins No rubber fin
Position the front of the shelf with the front of the shelf does not have a rubber fin. The front edge of the oven. Push down on the rear of the shelf to complete the installation taking care not to damage the rubber fins.
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
R21JCA Trouble shooting tips
1. This unit is susceptible to get set to run without food load.
2. Oven temp fuse open = Check primary and cook relay, replace monitor fuse and secondary switch. Monitor fuse open = Check for proper venting for oven.
3. Magnetron temp fuse open = Check magnetron venting and timer operation.
Service Guide - Page 27
CRITICAL SAFTEY WARNING
WARNING! 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
Service Guide - Page 50
Always measure the line voltage before adjusting the voltage switch.
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 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 54
operates the blower motor to cool the magnetrons when the door is also used in the standby mode.
• Standby mode; The oven light operates too. Latch Hook Ass'y
Door sensing switch
• The door sensing Switch; In addition, it is opened. senses if the door is closed . The blower runs for 60 seconds regardless, even if the door is open or closed .
Service Guide - Page 55
Control Panel Schematic
Foil pattern
Primary interlock relay 1
Primary interlock relay 2
Door switch
Oven
Magnetron
thermistor thermistor
Key unit
Service Guide - Page 57
Control Panel
Exhaust duct
Oven thermistor; Oven thermistor is located on the exhaust duct and is used to measure the exhaust air temperature.
Service Guide - Page 67
Troubleshooting Control Panel "Dead"
Pin 1
Pin 7
Measure 120 volts at pins 1 & 7 of CN4
If 120 volts is present, proceed with foil pattern check
If 120 volts is not available, check the noise filter / fuse, and check the oven temperature fuse if required
Service Guide - Page 72
Troubleshooting Key Unit
Connect AC power cord to wall outlet and open the oven door The blower and oven light will turn on indicating that the control panel is OK, however, the key unit must be shorted
Service Guide - Page 85
In this case you would need to check the filter, and be sure that the units air rear vents are not blocked. Oven Thermistor "EE6, "EE7"
Exhaust duct Oven thermistor
If "EE6" is displayed on the control panel, the oven thermistor has failed
If "EE7" is displayed, the exhaust air temperature is too high.
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