MICROWAVE OVEN TECH SHEET
Schematic Diagram
Wiring Diagram
CAUTION
Warning : Power must be disconnected before servicing this appliance
Warning : Power must be disconnected before servicing this appliance
Disconnect from Electrical Supply Before Servicing Unit
MODEL NO. :
FMV152K
MODEL NO. :
F
MV152K
PRECAUTIONS TO BE OBSERVED BEFORE AND
DURING SERVICING TO AVOID PROSSIBLE
EXPOSURE TO EXCESSIVE MICROWAVE ENERGY
OG:ORANGE
YW:YELLOW
BR:BROWN
WH:WHITE
BK:BLACK
RD:RED
BL:BLUE
GN:GREEN
GY:GREY
PK:PINK
CAVITY
check the magnetron. Waveguide or
THERMAL
A. Do not operate or allow the oven to be
YW-32
WH-31
DOOR
SENSING
SWITCH
CUT-OUT
(1 0/0)
1
transmission line. And cavity for proper
operated with the door open.
OG:ORANGE BR:BROWN
YW:YELLOW WH:WHITE
YW-32
WH-31
alignment, integrity and connection.
D. Any detective or mis-adjusted
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 operating.
2. Proper door closing.
3. Seal and sealing surfaces ( Arcing,
wear and other damage.)
12
BK-17
WH-15
WH-15
RD:RED
BK:BLACK
T/TABLE
MOTOR
VENT
BL:BLUE
GN:GREEN
GY:GREY
PK:PINK
MOTOR
components in the interlock, monitor, door
seal, and microwave generation and
transmission systems shall be repaired.
replaced. or adjusted by producers.
BK-24
BL-25
GROUND
7
8
YW-7
HARNESS LEADS
FAN
MOTOR
HI (RY5)
WH-16
PARTS LEADS
GY-26
GN-23
OG-18
BL-20
OG-18
BR-22
YW-6
designed in this manual before the oven
Is released to the owner.
OVEN
LAMP
LOW
(RY4)
BK-17
WH-16
BL-20
RD-5
4. Damage to or loosening of hinges
9
6
1
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.
F. Do not attempt to operate the oven if the
door glass is broken.
YW-19
YW-21
COOKTOP
LAMP
and latch.
GN-23
5. Evidence of dropping or abuse.
C. Before turning on microwave power for
any service test or inspection within the
microwave generating compartments.
ON
(RY3)
WH-30
H.V.CAPACITOR
L
GN-28
YW-29
OG-27
BL-25
VENT
MOTOR
COOKTOP
LAMP
RD
RD
WH
WH-12
BK-10
L
POWER
RELAY
FA
F
MGT TUBE
RD
H.V.DIODE
BK-1
BK-2
CAVITY
THERMOSTAT
POWER
CORD
1
3
H.V.TRANS
L.V.T
BK-2
BK-3
Parts Layout
MGT
THERMOSTAT
L
120V
OVEN
LAMP
GND
BK-3
BK-4
VENT MOTOR
BOTTOM
THERMOSTAT
OVEN
THERMOSTAT
P C B
GY-26
BK-24
120V
MOTOR
CONDENSER
TURNTABLE
HOOD
THERMOSTATA
MOTOR
NOISE FILTER
TTM
OG-27
FAN
RELAY
SUB
(RELAY 1)
OVEN LAMP
MOTOR
FM
4
H.V.CAPACITOR
OUT
IN
NOISE
FILTER
PRIMARY
SWITCH
MONITOR
SWITCH
MOTOR
CONDENSER
POWER RELAY
(RELAY 2)
H.V.DIODE
MAGNETRON
MONITOR
INTERLOOK
SWITCH
T/TABLE
MOTOR
MAGNETRON
THERMOSTATA
H.V.
TRANS
H.V.TRANSFORMER
12
11
MONITOR
SWITCH
NOTE: For servicing replacement use 16GA,105 C thermoplastic covered wire
except for high voltage leads or as noted on special leads.
FAN MOTOR
H.V.
CAPACITOR
COOK TOP
LAMPS
DOOR
SENSE
SWITCH (BOTTOM)
HOOD THERMOSTAT
MAGNETRON
PRIMARY
SWITCH
BOTTOM
THERMOSTAT
H.V.DIODE
DOOR
SENSING
SWITCH
Made in china
NOTE: Door is open
Switch Chart
Component tests
Other component tests
DOOR
DOOR
SWITCH
CHECK BY
CLOSE
WARNING
Test
Components
Results
Disconnect the wires at the Primary Interlock Switch.
Check from the common terminal
to the normally opened terminal.
_
Primary
Interlock
+
T/Table Motor
1. Remove wire leads.
Personal injury/Product Hazard
Normal:
Disconnect the power supply cord
after performing any test or repairs
Approximately: 3.3k ohms
to the microwave.
Disconnect the wires at the sensing interlock Switch.
Check from the common terminal and
Normally closed terminal
2. Measure resistance. ( ohm meter scale:
Rx1000)
from the outlet before removing the
_
+
Door sensing
Interlock
outer cabinet from the unit.
Check that all wire leads are in the
+
_
Discharge the high voltage capacitor
and remove the lead wires from
The primary winding of the high voltage
transformer before conducting any of
Correct position before operating
The microwave oven.
Grasp wire connectors when
removing the wire leads from
microwave parts.
Disconnect the wires at the Monitor Switch.
Check from the common terminal and
Normally closed terminal .
Monitor
Interlock
the following tests.
Fan Motor
1. Remove wire leads.
Conduct all operation tests with 1 liter
Failure to follow these instructions may
Normal:
of water in the oven.
result in electrical shock or other
(
(
) CONTINUITY
+
_
Conduct a microwave energy test
Personal injury or in product damage.
Approximately: 97.4 ohms
2. Measure resistance. ( ohm meter scale:
Rx1)
) NO CONTINUITY
L
N
DOOR
OPEN
High voltage components
Primary
Interlock
Switch
Door
Sensing
Switch
Monitor
Interlock
Switch
L
N
Transformer
1. Remove wire leads.
2. Measure resistance .( ohm meter scale: Rx1)
Secondary
Terminal
Filament
Terminals
DOOR
CLOSE
Approx. 0.334+2% ohm.
Approx. 118.7+2% ohm.
0 ohm..
Primary winding
Secondary winding
Filament winding
Primary
Interlock
Switch
Door
Sensing
Switch
Monitor
Interlock
Switch
3. Measure resistance .( ohm meter scale: Rx1000)
Primary winding to ground
Normal: Infinite.
Normal: Infinite.
Filament winding to ground
Primary
Terminal
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)
1. Remove wire leads. Install the magnetron seal in the
correct position .Check that the seal is in good condition.
2. Measure resistance .( ohm meter scale: Rx1)
Magnetron
Cooling
Fins
OUTPUT POWER OF MAGNETRON
Filament winding
Normal: Less than 1 ohm
Normal: Infinite.
CAUTION MICROWAVE RADIATION
3. Measure resistance .( ohm meter scale: Rx1000)
Filament to chassis
PERSONNEL SHOULD NOT ALLOW EXPOSURE TO MICROWAVE RADIATION FROM MICROWAVE
GENERATOR OTHER PARTS CONDUCTING MICROWAVE ENERGY.
Capacitor
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
1. Remove wire leads.
Normal:
2. Measure resistance .( ohm meter scale: Rx1000)
Terminal to terminal
Momentarily indicates several
ohm, and then gradually
returns to infinite.
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.
Terminal to case
Normal: Infinite.
_
+
2. Stir water in glass vessel with thermometer, and record glass vessel’s temperature (“T1”, 10 1 C).
Diode
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. ( T )
6. The output power is obtained by the following formula;
1. Measure continuity. Forward .( ohm meter scale: Rx1000)
Normal: Continuity.
Abnormal: Infinite.
Some inexpensive
Meters may indicate
Infinite resistance in
both directions
Normal: Infinite.
Abnormal: Continuity.
2. Measure continuity. Reverse .( ohm meter scale: Rx1000)
Output =
4.187x1000x T+0.55xMcx(T2-T0)
42
45 : Heating Times (sec)
( 3 seconds included as a holding time
of magnetron oscillation.)
4.187 : Coefficient for water
1000 : Water ( cc )
1. Remove wire leads.
2. Measure resistance .( ohm meter scale: Rx1)
Ventilation Motor
Approximately 35.2 ohms
2 level: White and Blue wire
T : Temperature Rise (T2-T1)
T0 : Room Temperature
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.
p/n 316495069
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