2. SPECIFICATIONS | 4. PRECAUTIONS AND REPAIR SERVICE TIPS |
| PRELIMINARY |
Rated Power Consumption | . . . 1260W. |
Microwave Output | . . . 850W. |
Frequency | . . . 2,450MHz±50MHz. |
Power Supply | . . . 120V, 60Hz. |
Rated Current | . . . 11.1 Amp. |
Safety Devices | . . . Thermal Fuse open |
| at 167oC for Cavity |
| Thermal Protector open |
| at 122oC for Magnetron |
| Fuse (Cartridge Type 15A) |
| Primary Interlock Switch |
| Secondary Interlock Switch |
| Interlock Monitor Switch. |
Timer | . . . 60 min. |
Overall Dimensions | . . . 525(W) x 427(D) x 283(H) |
| mm. |
Oven Cavity Size | . . . 350(W) x 371(D) x 208(H) |
| mm. |
Turn Table Diameter | . . . 340mm. |
Effective Capacity of |
|
Oven Cavity | . . . 25 liters. |
Net Weight | . . . Approx. 16kg. |
3. POWER OUTPUT MEASUREMENT
A. SINCE NEARLY 2,000 VOLTS EXISTS IN SOME CIRCUITS OF THIS MICROWAVE OVEN, REPAIRS SHOULD BE CARRIED OUT WITH GREAT CARE.
B. TO AVOID POSSIBLE EXPOSURE TO MICROWAVE ENEGY LEAKAGE, THE FOLLOWING PRECAUTIONS MUST BE TAKEN BEFORE SERVICING.
(1) Before the power is applied :
(a)Open and close door several times to make sure the prima- ry interlock switch, the interlock monitor switch and the door sensing switch operate properly. (Listen for the clicking sound from the switches.) Make sure the interlock monitor switch closes after the primary interlock switch is opens when the door is opened.
(See pages 1 and 6)
(b)Make sure the perforated screen and the choke dielectric of the door are correctly mounted.
(2) After the power is applied :
(a)Open and close the door to see if the interlock mechanism operates properly.
(b)Check microwave energy leakage with a leakage detector and confirm the energy leakage is below 5 mW/cm2.
(3)Do not operate the unit until it is completely repaired, if any of the following conditions exists:
NOTE
The power output specification, 850 W on this model is measured with IEC measurement. The power output is measured with two (2) liters water is equivalent
to 850 W in measurement with IEC, when measured with the following power output.
(A)1.Fill two beakers with one liter of tap water respectively 2.Use accurate thermometer and measure each water
temperature respectively.
(B)Place beakers side by side in the centre of the glass tray.
(C)1.Set the timer at any position more than 2 minutes. 2.Heat the water correctly for 2 minutes.
(D)Take the beakers out, immediately stir the water and mea- sure the water temperature respectively.
(E)1.Calculate the temperature rise of water in each beaker. 2.Then calculate the average value of two temperature
rises.
3.Output power can be calculated by the equation; Power Output (W) = 70 x Dt
Where Dt is an average temperature rise in degrees Centigrade.
(F)Power Output shall be in the following range :
| AverageTemperature Rise | Power Output |
Minimum | 9.9oC | 693W |
Maximum | 12.7oC | 889W |
(G)Power Output is affected by the line voltage under load. For correct Power Output measurement, the line voltage under load must be 120± 2volts.
(a)Door does not close firmly against the cavity front.
(b)The hinge is broken.
(c)The choke dielectric or the door seal is damaged.
(d)The door is bent or warped, or there is any other visible dam- age to the oven that may cause microwave energy leakage. NOTE : Always keep the seal clean.
(e)Make sure there are no defective parts in the microwave generating and transmission assembly. (especially wave- guide).
(4)The following items should be checked after the unit is repaired :
(a)The interlock monitor switch is connected correctly and firm- ly.
(b)The magnetron gasket on the magnetron is properly posi- tioned.
(c)Waveguide and oven cavity are intact (no leakage of microwave energy).
(d)The door can be properly closed and the safety switches work properly.
(e)The oven must be stopped when the door is opened or the time is up.
The oven must not be operated with any of the above components removed or bypassed.
