Sanyo EMF1010M Schematic

File No :

SERVICE MANUAL Microwave Oven EM-F1010MW

EM-F1010MB

Model No : Product Code No :

EM-F1010MW 437 373 72

EM-F1010MB 437 373 73

(U.S.A.)

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) A microwave leakage check to verify compliance with the Federal performance standard should be

performed on each oven prior to release to the owner.

REFERENCE NO. SM-860329

CAUTION

For microwave energy emission

In the area emitting the highest reading, switch the meter
to SLOW RESPONSE, and take a reading for minimum of
three (3) seconds. We recommended the pattern outline
shown below when the door surface is surveyed.

On every service calls, check for microwave
energy emission, must be made according to
the following manner.

Measurement of energy emission

Measurement must be made with the microwave oven
operating at its maximum output and containing a load of
275±15 milliliters of tap water initially at 20o±5o celsius (68
±9oF) placed within the cavity at the center.

NOTE : The water container must be a 600 milliliter beaker

and made of an electrically none conductive
material such as glass or plastic.
The cook tray must be in place when measuring
emission.

A properly operating door and seal assembly will normally
register emission on greater than 4mW/cm
measurement uncertainty with the cooking shelf or tray in
place.

2

to allow for

All repairs must be performed in such a manner
that microwave energy emission are minimal.

Follow the instructions supplied with a detector being used
and performed an R.F. emission test around the door front
and edges and all edges and vent of the outer case. The
cabinet (wrapper) must be in place and the oven fully
assembled.

When performing emission survey, with the meter on FAST
RESPONSE the movement of a detector probe shall not
exceed one (1) inch per second.

NOTE : Periodically check to be sure that the probe tip is

not worn or dirty.

The following U.S. standard applies to microwave ovens :
21 CFR 1030.10, Performance Standard for Microwave
Ovens.

It requires that the power density of the microwave
radiation emitted by a microwave oven shall not exceed
five (5) milliwatts per square centimeter at any point 5
centimeter (about 2 inches) or more from the external
surface of the oven.

All microwave ovens exceeding the emission level of
4mW/cm
microwave ovens and the manufacturer immediately and
the owner should be told not to use the microwave oven
until it has been repaired completely.

If a microwave oven is found to operate with the door open,
report to Dept. of Service, the manufacturer and CDRH*
immediately. Also tell the owner not to use the oven.
*CDRH : Center for Device and Radiological Health.

The Interlock Monitor Switch acts as the final safety switch
protecting the customer from microwave radiation. If the
Interlock Monitor Switch operates to blow the Fuse with
interlocks failed, you must replace all Interlock Switches
Primary and Secondary Interlock Switches and the Monitor
Switch with new ones because the contacts of those
Interlock Switches may be melted and welded together.

2

must be reported to Dept. of Service for

- TABLE OF CONTENTS -

Adjustment Procedures ......................................... 1

Specifications ....................................................... 2

Power Output Measurement .................................. 2

Precautions and Repair Service Tips ........................ 2

1.ADJUSTMENT PROCEDURES

TO AVOID POSSIBLE EXPOSURE TO MICROWAVE
ENERGY LEAKAGE, THE FOLLOWING

ADJUSTMENT OF THE INTERLOCK SWITCHES
SHOULD BE MADE ONLY BY AUTHORIZED
SERVICE PERSONNEL.

The SANYO service center should have the designated
detector to measure the microwave energy leakage
after the repair or adjustment.

NOTE : Detector to be used at the service center is

NARDA 8100, 8200 or the equivalent.

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

forward and pull backward until there is about zero
gap between the Latch Lever and the switch body on
the Primary Interlock Switch and at the same time
there is about zero gap between the Door Latch 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 Interlock 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, according to “CHECKOUT
PROCEDURE FOR SWITCHES” on page 6.

(6) Make sure the microwave energy leakage should be

no greater than 4mW/cm2 to allow for measurement
uncertainty when measured with a detector.

Circuit Diagram ............................................. 3

Test Procedures and Troubleshooting............... 4 ~ 7

Disassembly Instructions ................................ 8 ~ 10

Exploded View and Parts List .......................... 11 ~ 14

NOTE

Screws

: If the Interlock Monitor Circuit operates and

at the same time the fuse blows with the
door opened, be sure to replace the
Door Sensing Switch and the electric
circuit related on the Door Sensing Switch,
which act as Secondary Interlock Switch.

Door
Latch

Lever Stopper

Door
Sensing
Switch

Interlock
Monitor
Switch

(All service adjustments must be made for
minimum microwave energy leakage readings.)

- 1 -

Figure 1

Latch
Lever

Primary
Interlock
Switch

2. SPECIFICATIONS

Rated Power Consumption .. 920W.

Microwave Output .............. 600W.

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

Power Supply ..................... 120V±12V, 60Hz.

Rated Current ..................... 8 Amp.

Safety Devices ................... Thermal Fuse open at 332°F

(167°C) for Cavity.
Thermal Protector open
at 252°F (122°C) for
Magnetron.
Fuse (Cartridge Type 15A)
Primary Interlock Switch,
Door Sensing Switch and

Interlock Monitor Switch.

Timer ................................ 60Mins.

Overall Dimensions ............... 18

Oven Cavity Size ................ 113/4”(W)x121/4”(D)x71/2”(H)

Turn Table Diameter ............ 107/8”

Effective Capacity of

Oven Cavity ....................... 0.7 Cubic Feet.

Net Weight ........................ Approx. 23 Lbs.

1

/16”(W)x1 33/4”(D)x913/16”(H)

3. POWER OUTPUT MEASUREMENT

NOTE

The Power Output specification, 600W. on this model is
measured with IEC measurement. The Power Output is
measured with two (2) liters water is equivalent to 600W.
in measurement with IEC, when measured with the
following Power Output.

(1) Fill two beakers (glass or plastic) with each one liter

of tap water (about 20°C) and measure the water
temperature.
(Use a thermometer with a 1/10 degree gauge).

(2) Place the beakers side by side in the center of the

glass tray.

(3) (a) Set the Timer at any position more than 2 minutes.

(b) Heat the water correctly for 2 minutes.

(4) Take the beakers out, immediately stir the water and

measure the water temperature respectively.

(5) 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 ∆t
Where ∆t is an average temperature rise in degrees

Centigrade.

(6) Power Output shall be in the following range :

Average Temperature Rise Power Output

Minimum : 13.9°F (7.7°C) 540W.
Maximum : 16.9°F (9.4°C) 660W.

(7) Power Output is affected by the line voltage under

load. For correct Power Output measurement, the
line voltage under load must be 120±1 volts.

4. PRECAUTIONS AND REPAIR SERVICE TIPS

PRELIMINARY

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

ENERGY 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 should be
no greater than 4mW/cm2 to allow for measurement
uncertainty.

(3) Do not operate the unit until it is completely repaired,

if any of the following conditions exists :

(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 that there are no defective parts in the

interlock mechanism.

(f) 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.

- 2 -

5. CIRCUIT DIAGRAM

Figure 2

CONDITION OF OVEN

TIMER : OFF
DOOR : OPEN

PRIMARY INTERLOCK SWITCH :

LOWER DOOR INTERLOCK SWITCH

SECONDARY INTERLOCK SWITCH:

UPPER DOOR INTERLOCK SWITCH

WIRING COLOUR

BK : BLACK
BL : BLUE
W : WHITE
Y : YELLOW
R : RED

NOTE : The parts marked with have special characteristics of safety,

if replace the marked parts, use only SANYO specified parts.

- 3 -