Sanyo EM-C1100UK User manual

PRECAUTIONS
PRECAUTIONSTO BE OBSERVED BEFORE AND DURING SERVICINGTO AVOID POSSIBLE EXPOSURETO
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.
REFERENCE NO. SM-6410009-00
Foreword
FILE NO.
SERVICE MANUAL Microwave oven EM-C1100UK
EM-C1100SD
Model No Pro.code No
EM-C1100SD 437 524 00
EM-C1100UK 437 524 01
Read this manual carefully, especally precaution on microwave enery, an follow the procedure strictly,
careless servicing and testing may expose yourself to the microwave energy leakage.

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- TABLE OF CONTENTS -
Adjustment procedure..................................1 Test Procedures and Troubleshooting............4 - 10
Specifications.............................................. 2 Disassembly Instructions............................11 - 14
Poweroutput Measurement........................... 2 Exploded view and Parts List...................... 15 - 22
Precautions and Repair Service Tips............ 2 Overall Circuit Diagram.............................. 23 - 24
Circuit Diagram............................................3
1.ADJUSTMENT PROCEDURE
TO AVOIDE POSSIBLE EXPOSURETO MICROWAVE
ENERGY LEAKAGE,THE FOLLOWING ADJUSTMENTS
OFTHE INTERLOCK SWITCHES SHOULD BE MADE
ONLY BY AUTHORIZED SERVICE PARSONNEL.
PRIMARY INTERLOCK SWITCH, INTERLOCK
MONITOR SWITCH AND DOOR SENSING SWITCH
ADJUSTMENT (Figure 1)
(1) Loosen 2 screws securing the lever stopper.
(2) Adjust the lever stopper position so that it is pushed up
and pull backward until there is zero gap between the
latch lever and the switch body on the primary interlock
switch. At the same time there is about zero gap
between latch lever and the switch body on the door
sensing switch when the door latch is securely locked.
(3) Tighten the lever stopper screws securely.
(4) Make sure the interlock monitor switch closes after the
primary switch opens when the door is opened very slowly,
according to “CHECKOUT PROCEDURE FOR SWITCHES”
on page 6.
(5) Make sure the interlock monitor switch opens before the
primary interlock switch closes when the door is closed
very slowly, accoding to “CHECKOUT PROCEDURE
FOR SWITCHES” on page 6.
(6) Make sure the microwave energy leakage is below
the limit of the reguration (5 mW/cm2) when
measured with a detector.
(All service adjustments must be made for mini-
mum microwave energy readings.)
NOTE: If the interlock monitor circuit operates and at
the same time the fuse blows with the door
open, be sure to replace the relay circuit board
, interlock switch and monitor switch.
Figure 1
CAUTION
MICROWAVE RADIATION
PERSONNEL SHOULD NOT BE EXPOSEDTOTHE
MICROWAVE ENERGY WHICH MAY RADIATE FROM
THE MAGNETRON OR OTHER MICROWAVE GENE-
RATING DEVICE IF IT IS IMPROPERLY USED OR
CONNECTED. ALL INPUT AND OUTPUT MICROWAVE
CONNECTIONS,WAVEGUIDE, FLANGES AND GAS-
KETS MUST BE SECURE. NEVER OPERATETHE
DEVICEWITHOUT A MICROWAVE ENERGY ABSOR-
BING LOAD ATTACHED. NEVER LOOK AN OPEN
WAVEGUIDE OR ANTENNAWHILETHE DEVICE IS
ENERGIZED. Lever stopper
Primary
interlock
swith
Interlock
monitor
swith
Door
sensing
swith
Screws
Latch
lever

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2. SPECIFICATIONS
Microwave output....................... 1,100W to 110W
Frequency.................................. 2,450MHz
Power supply............................. 230V, 50Hz
Rated current............................ 8 Amp.
Safety device.............
Thermal protector (Magnetron)... 150°C Open
(Themostat) 80°C
Thermistor(Magnetron).............. 200°C Open
108°C Open
Thermistor(Duct)....................... 120°C Open
Fuse (Cartrige Type).................. 250V 10A
Micro switch, Relay...........
Interlock switch
Interlock monitor switch
Door sensing switch and
Relay 3 and Relay 5
Max.input time............. Electronic Digital, up to
manual 10min./Memory 30 min.
Overall Dimensions..... 520(W)x410(D)x270(H) mm
Oven cavity size......... 330(W)x330(D)x175(H) mm
Efective Capacity of Oven cavity..... 19 liters
Net weight...................................... 20 kg
3. POWER OUTPUT MEASUREMENT
(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, 190 mm outer diameter cylinder,
maximum 3 mmthickness.
(4) Place the cotainer in the center of the tray in
the oven.
(5) Set the heating time for 40 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±2 volts.
4. PRECAUTIONS AND REPAIR SERVICETIPS
PRELIMINARY
B.TO AVOID POSSIBLE EXPOSURETO MICROWAVE
ENERGY LEAKAGE,THE FOLLOWING PRECAU-
TIONS MUST BETAKEN BEFORE SERVICING.
(1) Before the power is applied.
(a) Open and close door several times to make sure
the interlock switch, door sensing switch and inter-
lock 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 sensing switch
are open 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 copmletely repaired
of any of the following coditions.
(a) Door is not closed firmaly against the cavity front.
(b) The hige 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 micro-
wave energy leakage.
Note:Always keep the seal clean.
(e) Make sure that there are no defective part 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 correctly
and firmly.
(b) The magnet gasket on the magnetron is properly
positioned.
(c) Wave guide and oven cavity are intact.(No leakage
of microwave energy).
(d) The door can be properly closed and the safety
swtches work ploperly.
(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
coponents removed or bypassed.
A.SINCE NERARLY 4,000 VOLTS EXISTS IN SOME
CIRCUITS OFTHIS MICROWAVE OVEN, REPAIRS
SHOULD BE CARRIED OUT WITH GREAT CARE.

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5.CIRCUIT DIAGRAM
* Caution:The voltage between filament leads of magnetron is about 3.3VA.C, but the the filament carries
4 KV/DC high voltage with respect to ground. Never touch these leades with bare hand during operation.

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6.TEST PROCEDURES ANDTROUBLESHOOTING
CAUTION
- DISCONNECTTHE POWER SUPPLY CORD FROMTHE WALL.
OUTLETWHENNEVER REMOVINGTHE CABINET FROMTHE
UNIT. PROCEEDWITH TESTS ONLY AFTER DISCHARGINGTHE
HIGHVOLTAGE CAPACITORS AND REMOVINGTHE LEADWIRES
ONTHE PRIMARYWINDING OFTHE HIGHVOLTAGETRANS-
FORMER FOR MAGNETRON.
(SEE FIGURE 3)
A.TEST PROCEDURES
COMPONENT CHECOUT PROCEDURE RESULT
MAGNTRON
1) Check for resistance: Across the filament terminal
of the magnetron with an ohm-meter on Rx1 scale. Normal reading:
Less than 1 ohms.
2) Check for resistance: Between each filament ter-
minal of the magnetron and the chassis ground
with an ohm-meter on highest scale.
Normal reading:
Infinite ohms.
HIGH-VOLTAGE
TRANSFORMER
1) Measure the resitance:
with an ohm-meter on R x1 scale.
a. Primary winding;
b. Filament windund;
c. Secondary winding;
2) Measure the resistance:
with an ohm-meter on highest scale.
a) Primary winding to ground;
b) Filament winding to ground;
Normal reading:
Approximately 1.0 ohms.
Less than 1 ohms.
Approximately 60 ohms.
Normal reading:
Infinite ohms.
Infinite ohms.
Figure 6 Note:Remove varnish of mesured
point.
Figure 4
Figure 5
Primary
winding Secodary
winding
Filament
winding