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MICROWAVE OVEN TECH SHEET
CAUTION
Disconnect from Electrical Supply Before Servicing Unit
PRECAUTIONS TO BE OBSERVED BEFORE AND
DURING SERVICING TO AVOID PROSSIBLE
EXPOSURE TO EXCESSIVE MICROWAVE ENERGY
check the magnetron. Waveguide or
A. Do not operate or allow the oven to be
transmission line. And cavity for proper
operated with the door open.
alignment, integrity and connection.
B. Make the following safety checks on all
D. Any detective or mis-adjusted
ovens to be serviced before activating the
components in the interlock, monitor, door
Magnetron or other microwave source,
and make repairs as necessary.
seal, and microwave generation and
1. Interlock operating.
transmission systems shall be repaired.
2. Proper door closing.
replaced. or adjusted by producers.
3. Seal and sealing surfaces ( Arcing,
designed in this manual before the oven
wear and other damage.)
Is released to the owner.
4. Damage to or loosening of hinges
E. A microwave leakage check to verify
and latch.
Compliance with the Federal performance
5. Evidence of dropping or abuse.
Standard should be performed on each
C. Before turning on microwave power for
oven prior to release to the owner.
F. Do not attempt to operate the oven if the
any service test or inspection within the
door glass is broken.
microwave generating compartments.
Parts Layout
OVEN
THERMOSTAT
OVEN LAMP
T/TABLE
MOTOR
MONITOR
SWITCH
COOK TOP
LAMPS
PRIMARY
DOOR
SWITCH
SENSING
Made in china
SWITCH
Switch Chart
SWITCH
CHECK BY
Disconnect the wires at the Primary Interlock Switch.
Primary
Check from the common terminal
Interlock
to the normally opened terminal.
Disconnect the wires at the sensing interlock Switch.
Door sensing
Check from the common terminal and
Interlock
Normally closed terminal
Disconnect the wires at the Monitor Switch.
Monitor
Check from the common terminal and
Interlock
Normally closed terminal .
L
DOOR
OPEN
Primary
Door
Interlock
Sensing
Switch
Switch
L
DOOR
CLOSE
Primary
Door
Interlock
Sensing
Switch
Switch
Note: These Diagrams are not intended to show a complete circuit, they represent the position of switches
during "DOOR OPEN" and "DOOR CLOSED". (continuity checks only)
OUTPUT POWER OF MAGNETRON
CAUTION MICROWAVE RADIATION
PERSONNEL SHOULD NOT ALLOW EXPOSURE TO MICROWAVE RADIATION FROM MICROWAVE
GENERATOR OTHER PARTS CONDUCTING MICROWAVE ENERGY.
The output power of the magnetron can be measured by performing a water temperature rise test.
Equipment needed:
* Two 1-liter cylindrical borosilicate glass vessel (Outside diameter 190 mm)
* One glass thermometer with mercury column
NOTE: Check line voltage under load. Low voltage will lower the magnetron output.
Make all temperature and time tests with accurate equipment.
1. Fill the one liter glass vessel with water.
2. Stir water in glass vessel with thermometer, and record glass vessel's temperature ("T1", 10 1 C).
3. After moving the water into another glass vessel, place it in the center of the cooking tray.
Set the oven to high power and operate for 47 seconds exactly.
( 3 seconds included as a holding time of magnetron oscillation)
4. When heating is finished, stir the water again with the thermometer and measure the temperature ( "T2").
5. Subtract T1 from T2. This will give you the water temperature rise. (
6. The output power is obtained by the following formula;
Output =
4.187x1000x
T+0.55xMcx(T2-T0)
42
4.187 : Coefficient for water
1000 : Water ( cc )
Mc : Cylindrical borosilicate glass weight
7. Normal temperature rise for this model is 9.9 C to 10.3 C at 'HIGH'.
NOTE 1: Variations or errors in the test procedure will cause a variance in the temperature rise.
Additional power test should be made if temperature rise is marginal.
NOTE 2: Output power in watts is computed by multiplying the temperature rise (step 5) by a factor
of 91 times the of centigrade temperature.
Warning : Power must be disconnected before servicing this appliance
MODEL NO. :
VENT MOTOR
MOTOR
CONDENSER
NOISE FILTER
H.V.CAPACITOR
H.V.DIODE
MAGNETRON
MAGNETRON
THERMOSTATA
H.V.TRANSFORMER
FAN MOTOR
HOOD THERMOSTAT
BOTTOM
THERMOSTAT
DOOR
DOOR
CLOSE
_
+
_
+
_
+
_ +
(
) CONTINUITY
(
) NO CONTINUITY
N
Monitor
Interlock
Switch
N
Transformer
Secondary
Filament
Terminal
Terminals
Monitor
Interlock
Switch
Primary
Terminal
Magnetron
Capacitor
+ _
Diode
Some inexpensive
Meters may indicate
Infinite resistance in
both directions
T )
45 : Heating Times (sec)
Ventilation Motor
( 3 seconds included as a holding time
of magnetron oscillation.)
T : Temperature Rise (T2-T1)
T0 : Room Temperature
Schematic Diagram
(C)/FMV152K; C/FFMV162L;C/FFMV164L
OG:ORANGE BR:BROWN
YW:YELLOW
WH:WHITE
RD:RED
BK:BLACK
GY:GREY
BL:BLUE
PK:PINK
GN:GREEN
CAVITY
THERMAL
CUT-OUT
(1 1 0/0)
VENT
MOTOR
7
HI (RY5)
8
LOW
(RY4)
9
ON
6
(RY3)
L
COOKTOP
LAMP
L
1
L.V.T
3
L
120V
OVEN
LAMP
120V
TURNTABLE
MOTOR
TTM
SUB RELAY
FAN
MOTOR
(RELAY 1)
FM
4
POWER RELAY
(RELAY 2)
MONITOR
INTERLOOK
SWITCH
H.V.
12
11
TRANS
H.V.
DOOR
CAPACITOR
SENSE
SWITCH (BOTTOM)
MAGNETRON
H.V.DIODE
NOTE: Door is open
Component tests
WARNING
Personal injury/Product Hazard
Disconnect the power supply cord
after performing any test or repairs
to the microwave.
from the outlet before removing the
outer cabinet from the unit.
Check that all wire leads are in the
Discharge the high voltage capacitor
Correct position before operating
and remove the lead wires from
The microwave oven.
The primary winding of the high voltage
Grasp wire connectors when
transformer before conducting any of
removing the wire leads from
microwave parts.
the following tests.
Conduct all operation tests with 1 liter
Failure to follow these instructions may
of water in the oven.
result in electrical shock or other
Conduct a microwave energy test
Personal injury or in product damage.
High voltage components
1. Remove wire leads.
2. Measure resistance .( ohm meter scale: Rx1)
Primary winding
Secondary winding
Filament winding
3. Measure resistance .( ohm meter scale: Rx1000)
Primary winding to ground
Filament winding to ground
1. Remove wire leads. Install the magnetron seal in the
correct position .Check that the seal is in good condition.
Cooling
2. Measure resistance .( ohm meter scale: Rx1)
Fins
Filament winding
3. Measure resistance .( ohm meter scale: Rx1000)
Filament to chassis
1. Remove wire leads.
2. Measure resistance .( ohm meter scale: Rx1000)
Terminal to terminal
Terminal to case
1. Measure continuity. Forward .( ohm meter scale: Rx1000)
2. Measure continuity. Reverse .( ohm meter scale: Rx1000)
1. Remove wire leads.
2. Measure resistance .( ohm meter scale: Rx1)
2 level: White and Blue wire
Warning : Power must be disconnected before servicing this appliance
MODEL NO. :
(C)/FMV152K; C/FFMV162L;C/FFMV164L
12
YW-32
WH-31
BK-24
BL-25
GY-26
GN-23
OG-18
BR-22
RD-5
1
WH-12
POWER
BK-10
RELAY
P C B
NOTE: For servicing replacement use 16GA,105 C thermoplastic covered wire
except for high voltage leads or as noted on special leads.
Other component tests
Components
T/Table Motor
1. Remove wire leads.
2. Measure resistance. ( ohm meter scale:
Rx1000)
Fan Motor
1. Remove wire leads.
2. Measure resistance. ( ohm meter scale:
Rx1)
Approx. 0.334+2% ohm.
Approx. 118.7+2% ohm.
0 ohm..
Normal: Infinite.
Normal: Infinite.
Normal: Less than 1 ohm
Normal: Infinite.
Normal:
Momentarily indicates several
ohm, and then gradually
returns to infinite.
Normal: Infinite.
Normal: Continuity.
Abnormal: Infinite.
Normal: Infinite.
Abnormal: Continuity.
Approximately 35.2 ohms
Wiring Diagram
YW-32
DOOR
SENSING
WH-31
OG:ORANGE BR:BROWN
SWITCH
YW:YELLOW
WH:WHITE
BK-17
RD:RED
BK:BLACK
T/TABLE
BL:BLUE
GY:GREY
WH-15
MOTOR
GN:GREEN
PK:PINK
WH-15
GROUND
YW-7
HARNESS LEADS
FAN
WH-16
MOTOR
PARTS LEADS
OG-18
BL-20
YW-6
OVEN
BK-17
LAMP
WH-16
BL-20
YW-19
COOKTOP
GN-23
YW-21
LAMP
WH-30
H.V.CAPACITOR
GN-28
VENT
YW-29
MOTOR
RD
OG-27
RD
WH
BL-25
MGT TUBE
H.V.DIODE
FA
BK-1
F
CAVITY
RD
POWER
BK-2
THERMOSTAT
CORD
H.V.TRANS
BK-2
MGT
BK-3
THERMOSTAT
GND
BK-3
BOTTOM
BK-4
THERMOSTAT
GY-26
HOOD
BK-24
THERMOSTATA
OG-27
OUT
IN
PRIMARY
MONITOR
MOTOR
NOISE
SWITCH
SWITCH
CONDENSER
FILTER
Test
Results
Normal:
Approximately: 3.3k ohms
Normal:
Approximately: 97.4 ohms
p/n 316495069
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