Sanyo EMO-SRT1, Service Manual

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2.SPECIFICATIONS
Microwave output ................ 700W
Frequency ........................... 2,450MHz
Power supply ....................... 220-230V, 50Hz
Rated current Microwave..5.0 Amp.
Heater........5.7 Amp.
Safety Device ......................
Thermal protector(Magnetron) 135°C Open
Thermistor (Oven)
Fuse (Cartridge Type) ................. 250V 8 A
Micro switch, Safty Relay
Door Interlock Switch
Interlock monitor Switch
Door sensing Switch and
SaftyRelay
Max. input time .................... Electronic Digital, up to
Reheat/Oven 30min.
More/Less 120min.
Overall Dimensions ........ 510(W)x458(D)x345(H) mm
Oven cavity size ............ 352(W)x352(D)x235(H) mm
Effective Capacity of Oven Cavity.........25.1liters
Net weight ........................... 20Kg
3. POWER OUTPUT MEASUREMENT
A. SINCE NEARLY 4,000 VOLTS EXISTS IN SOME
CIRCUITS OF THIS MICROWAVE OVEN, RE-
PAIRS SHOULD BE CARRIED OUT WITH
GREAT CARE.
B. TO AVOID POSSIBLE EXPOSURE TO MICRO-
WAVE ENERGY LEAKAGE, THE FOLLOWING
PRECATIONS MUST BE TAKEN BEFORE SER-
VICING.
(1) Before the power is applied.
(a) Open and close door several times to make
sure the interlock switch, door sensing switch
and interlock monitor switch operate properly.
(Listen for the clicking sound from switches.)
Make sure the interlock monitor switch is
closed after the interlock switch and door sens-
ing are open when the door is opened.
(See pages 1 and 7)
(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 leak-
age detector and confirm the energy leakage
is below 5mW/cm
2
(3) Do not operate the unit until it is completely
repaired of any of the following conditions.
(a) Door is not closed firmly against the cavity
front.
(b) The hinge is broken.
(c) The choke dielectric or the door seal is dam-
aged.
(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 that there are no defective parts in
the interlock mechanism.
(f) Make sure that 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 cor-
rectly 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 by passed.
(1) Prepare 1000±5cc tap water.
(2) Adjust water temperature to 10 ±2°C.
(3) Pour the water into a container made of borosili-
cate glass, 190mm outer diameter cylinder, max-
imum 3 mm thickness.
NOTE: Use the container kept on the room
temperature.
(4)Place the container in the center of the oven cavity.
(5) Set the heating time for 60 seconds and rating
full power and then start oven.
(6) Take container out immediately when heating time
up.
(7) Stir water for making even water temperature in
the container.
(8) Measure the water temperature.
Water temperature rise shall be 8°C to 12°C.
(9) For correct Power output measurement, the line
voltage under load must be 230±2Volts.
4.PRECATIONS AND REPAIR SERVICE TIPS
PRELIMINARY