Garland EM-S85 User Manual

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SERVICE MANUAL SUPPLEMENT for Model EM-S85Microwave Oven

CAUTION

WARNING TO SERVICE TECHNICIANS

PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICING TO AVOID POSSIBLE EXPOSURE TO

EXCESSIVE MICROWAVE ENERGY

(a)Do not operate or allow the oven to be operated with the door open.

(b)Make the following safety checks on all ovens to be serviced before activating the magnetron or other microwave source, and make repairs as necessary:

(1)Interlock operation, (2) proper door closing, (3) seal and sealing surfaces (arcing, wear, and other damage), (4) damage to or loosening of hinges and latches, (5) evidence of dropping or abuse.

(c)Before turning on microwave power for any service test or inspection within the microwave generating compartments, check the magnetron, wave guide or transmission line, and cavity for proper alignment, integrity, and connections.

(d)Any defective or misadjusted components in the interlock, monitor, door seal, and microwave generation and transmission systems shall be repaired, replaced, or adjusted by procedures described in this manual before the oven is released to the owner.

(e)(i) A microwave leakage check to verify compliance with the Federal performance standard should be performed on each oven prior to release to the owner. (For U.S.A)

(e)(ii) A microwave leakage check to verify compliance with the Canadian Regulation, HEALTH AND WELFARE, SOR/79-920should be performed on each oven prior to release to the owner. (For CANADA)

FORM # EM-S85(02/05)

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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 primary 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 measure 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 damage 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 waveguide).

(4)The following items should be checked after the unit is repaired :

(a)The interlock monitor switch is connected correctly and firmly.

(b)The magnetron gasket on the magnetron is properly positioned.

(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.

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5. CIRCUIT DIAGRAM

NOTE : All

component have

special characteristics for safety

and must be

replaced using parts listed in this manual.

All

service on M/W

ovens should be performed by a qualified technician using

approved testing equipment.

Customers should not attempt replace component

marked with

a

symbol.

 

 

 

 

 

 

 

 

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6. TEST PROCEDURES AND TROUBLESHOOTING

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7. DISASSEMBLY INSTRUCTIONS

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