Sharp R-22JT Bedienungsanleitung

Sharp Electronics Corporation

Servicing

Commercial

Microwave Ovens

R21JC/21HT &

R22GTF/R22JT

Len Hahn

Senior Manager, Field Services &

Support

These ovens should not be adjusted or

repaired by anyone except properly

qualified service personnel.

Objective

This course has been designed around the

R22JT Commercial Microwave Oven. All

disassembly and testing procedures refer to the

R22JT only. While most heavy duty ovens are

quite similar please refer to the specific model

you are working on.

Your have information on all four models, R21

series and R22 series.

Microwave Technologies Quiz

1. What is Microwave energy?

a. Energy created by nuclear radiation.

b. Energy created by chemical reaction.

c. Energy created by electromagnetic generation

d. Energy created by atomic fusion

2. What is the frequency at which the magnetron operates?

a. 60 Hz

b. 60KHz

c. 2450KHz

d. 2450MHz

Microwave Technologies Quiz

3. Microwave energy cooks food from

a. from the outside to the inside

b. from the inside to the outside.

c. only from the top.

d. only from the bottom.

4. Why does food sometimes appear to cool faster when cooked in a

microwave than when cooked in a conventional oven?

a. Microwave energy does not last as long in certain foods and allows

heat to escape.

b. Because microwave ovens cook faster, the food load cools faster.

c. Microwave cooking utensils do not get hot, so they draw heat from the

food.

d. Microwave energy is not as powerful as gas or electric heat energy.

Microwave Technologies Quiz

5. When the microwave recipe calls for a "let stand" time, what is this

allowing for?

a. The microwave to escape from the food.

b. Allows the food to cool before eating.

c. Allows the cooking container to cool before handling.

d. Allows the food to finish cooking.

6. When can metal be used inside a microwave oven?

a. When you want the food not to over cook.

b. When you want to generate more heat.

c. When you want to protect your oven from cooking splatters.

d. Never use metal in a microwave oven.

Microwave Technologies Quiz

7. When working on a microwave oven with the cabinet removed, the

technician is exposed to a lethal danger. What is the danger?

a. The high voltage and current potentials even when power is

removed.

b. Radiation energy.

c. The high electrical resistance within the electrical circuits even

when power is removed.

d. The high wattage output from the magnetron.

8. When working on a microwave after disconnecting the power cord from

the outlet and removing the cabinet, the technician must:

a. discharge the high voltage capacitor

b. check the magnetron.

c. check the fuse.

d. check the door for RF leakage.

Microwave Technologies Quiz

9. How often must a microwave oven be tested for leakage?

a. Anytime after service.

b. Only if the customer complains of headaches.

c. Only if the door or door switches are repaired.

d. Only if the magnetron is replaced.

10. To comply with the law, what is the maximum amount of leakage

allowed to be emitted from a microwave oven?

a. 1 milliwatt per square centimeter.

b. 3 milliwatt per square centimeter.

c. 5 milliwatt per square centimeter.

d. 7 milliwatt per square centimeter.

R-21JCA Control Panel 1000 Watts

R-21JCA Oven diagram

Rotary antenna

Ceramic shelf Air intake openings

Air ventilation cover and openings

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