Garland EM-S100 Service Manual

SERVICE MANUAL SUPPLEMENT

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/79-920 should be performed on each oven prior to release to the owner. (For CANADA)

See the Service Manual of EM-C180US(SM-640179)

except the items described in this Service Manual.

PRODUCT CODE NO. 437-453-00

File No:

for Model EM-S100

Microwave Oven

FORM # EM-S100 (02/05)

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2. SPECIFICATIONS

Rated Power Consumption . . . 1600W

Microwave Output . . . . . . . . . . 1000W

Frequency . . . . . . . . . . . . . . . . 2,450MHz±50MHz

Power Supply . . . . . . . . . . . . . 120V, 60Hz

Rated Current . . . . . . . . . . . . . 12.9Amp

Safety Devices . . . . . . . . . . . . Thermal Fuse open

at 167oC for Cavity
Thermal Protector open
at 122oC for Magnetron
Fuse (Cartridge Type 15A)
Primary Interlock Switch
Door Sensing Switch and
Relay 2
Interlock Monitor Switch

Timer . . . . . . . . . . . . . . . . . . . Electronic Digital, up to

99 min. 99 sec.

Overall Dimensions . . . . . . . . . 525(W) x 420(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 . . . . . . . . . . . . . . 26 liters

Net Weight . . . . . . . . . . . . . . . Approx. 16.5kg

3. POWER OUTPUT MEASUREMENT

NOTE

4. PRECAUTIONS AND REPAIR SERVICE TIPS

PRELIMINARY

The power output specification, 1000 W on this model is
measured with IEC measurement. The power output is
measured with two (2) liters water is equivalent
to 1000 W in measurement with IEC, when measured with
the following power output.

(1)

(2)

(3)

(4)

(5)

(6)

(7)

Fill two beakers (glass or plastic) with each one liter of
tap water (about 20oC) and measure the water temper­ature. (Use a thermometer with a 1/10 degree gauge).

Place the beakers side by side in the centre of the glass
tray .

Close the door, set the “TIME” for two minutes. (“2 00”
in the display window.) Touch the “START” key and heat
the water exactly for two minutes.

Take the beakers out, immediately stir the water and
measure the water temperature respectively.

Calculate the temperature rise of water in each beaker.
Then calculate the average value of two temperature
rises.
Output power can be calculated by the equation;

Power Output (W) = 70 x Dt
Where Dt is an average temperature rise in degrees
Centigrade.

Output shall be in the following range :

AverageTemperature Rise Power Output

Minimum 10.9

o

C 763W

Maximum 14.0oC 980W
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.B.SINCE NEARLY 2,000 VOLTS EXISTS IN SOME

CIRCUITS OF THIS MICROWAVE OVEN, REPAIRS
SHOULD BE CARRIED OUT WITH GREAT CARE.

TO AVOID POSSIBLE EXPOSURE TO MICROWAVE
ENERGY LEAKAGE, THE FOLLOWING PRE­CAUTIONS MUST BE TAKEN BEFORE SERVICING

(1)
(a)

(b)

(2)
(a)

(b)

(3)

(a)
(b)
(c)
(d)

(e)

(f)

(4)

(a)

(b)

(c)

(d)

(e)

Before the power is applied :
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)

Make sure the perforated screen and the choke
dielectric of the door are correctly mounted.

After the power is applied :
Open and close the door to see if the interlock

mechanism operates properly.
Check microwave energy leakage with a leakage

detector and confirm the energy leakage is below 5
mW/cm

2

.

Do not operate the unit until it is completely
repaired, if any of the following conditions exists:

Door does not close firmly against the cavity front.
The hinge is broken.
The choke dielectric or the door seal is damaged.
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.

Make sure that there are no defective parts in the
interlock mechanism.

Make sure there are no defective parts in the
microwave generating and transmission assembly.
(especially waveguide).

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

The interlock monitor switch is connected correctly
and firmly.

The magnetron gasket on the magnetron is proper­ly positioned.

Waveguide and oven cavity are intact (no leakage
of microwave energy).

The door can be properly closed and the safety
switches work properly.

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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