Part No.: 3840W1T147B
10-
4
Part No.: 3840W1T147B
10-
5
Part No.: 3840W1T147B
10-
6
High voltage components
Components
Test
Results
Normal: Less than 1 ohm
Abnormal: Infinite
Normal: Infinite
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)
■
Filament terminal
3. Measure resistance.
(ohm meter scale: Rx1000)
■
Filament to chassis
ANTENNA
GASKET
FILAMENT
CHASSIS
Magnetron
High voltage components
Components
Normal:
Approximately
4 .7-6.4V
Normal:
Approximately 0V
Figure 1
Figure 2
Figure 3
STEP 1. Test the diode to see if it is shorted.
Procedure:
1. Select the ohm scale on the meter.
2. Place the meter leads across the diode as pictured in
Figure 1. The reading should be “40M
Ω
,” “OL,” or a
reading of infinity.
3. Reverse the meter leads. The reading should again
indicate a reading of infinity. If the diode shows
“infinity” in BOTH directions, it is NOT shorted.
4. If the diode is not shorted, proceed to step 2.
STEP 2. Test the diode for forward biasing.
Procedure:
1. Select the DCV scale on the meter.
2. Using the meter, battery, and jumper wire, connect
the items as illustrated in Figure 2.
This has the positive side of the battery connected to
the cathode of the diode.
3. The diode should be forward biased therefore a
voltage reading of approximately 4.7 VDC to 6.4 VDC
will be read depending on meter, battery strength, etc.
(Note: If the meter leads were reversed, a negative
voltage of the same amount would be seen.)
STEP 3. Test the diode for reverse biasing.
Procedure:
1. Using the same scale on the meter, connect the
positive side of the battery to the anode of the diode
as illustrated in Figure 3.
2. The diode should be reverse biased therefore a
reading of 0 volt or a value displayed in mV will be
seen. (The display will be erratic changing
values rapidly in the mV scale.)
Test
Results
H.V.Diode (RECTIFIER)
Other component tests
Components
Test
Results
Components
Test
Results
1. Measure continuity.
(ohm meter scale: Rx1)
2. Remove the lead wires and operate
oven at power level 1 through power
level 10.
1. Remove wire leads.
2. Measure resistance.
(ohm meter scale: Rx1)
Normal: Approximately
Terminal
Ⓐ-Ⓒ
: 35 to 50 ohms
Terminal
Ⓐ-Ⓑ
: 5 to 15 ohms
Abnormal:
Infinite or several.
A
B
C
Relay 2
Fan Motor
1. Remove lead wires.
2. Measure resistance.
(ohm meter scale:Rx1)
Ventilation Motor
Normal:
Approximately
20 to 40 ohms
Abnormal:Infinite
1. Remove wire leads.
2. Measure resistance.
(ohm meter scale: Rx1000)
Turntable Motor
Normal:
Approximately
2.0 to 3.0 Kohms
Abnormal:
Infinite or several.
Parts layout
1. Disconnect sensor connector from
micom computer board.
2. Measure resistance terminal to
terminal (ohm meter scale: R X 1000)
Normal:
Approximately
BK-RD: 6.0 Kohms
RD-WH: 3.0 Kohms
BK-WH: 3.0 Kohms
Abnormal:
Infinite or approx. 0 ohm
Absolute Humidity
Sensor
(For sensor model)
Open
Close
18 Sec
16 Sec
14 Sec
12 Sec
10 Sec
8 Sec
6 Sec
4 Sec
2 Sec
0 Sec
4 Sec
6 Sec
8 Sec
10 Sec
12 Sec
14 Sec
16 Sec
18 Sec
20 Sec
22 Sec
1
2
3
4
5
6
7
8
9
10
Power
Level
OVEN
THERMOSTAT
STIRRER
MOTOR
T/TABLE MOTOR
COOKTOP LAMP
SECONDARY
SWITCH
PRIMARY SWITCH
H.V. CAPACITOR
H.V. DIODE
(RECTIFIER)
FAN MOTOR
(6549W1F009H)
VENT MOTOR
MONITOR
SWITCH
ABSOLUTE
HUMIDITY SENSOR
(6930W1A003J)
(6549W1S002G)
(6549W1V006J)
(0CZZW1M001C)
(6549W1S018C)
(6912A40002E)
(6600W1K004C)
(6600W1K004C)
(6930W1A003K)
(6600W1K004B)
CAPACITOR
(6501W1A013A)
MGT THERMOSTAT
(6170W1D100C)
H.V. TRANSFORMER
(6324W1A001E)
(6021W3B001Q)
(0CZZW1H004C)
MAGNETRON
(3B74133K)
NOISE FUSE
(6912A40002E)
OVEN LAMP
(6201W2A018L)
NOISE FILTER
RD
BK
WH
1
2
3
1. Remove lead wires.
2. Measure resistance.
(ohm meter scale:Rx1000)
Normal:
Approximately
120 to 135 ohms
Abnormal:Infinite
Stirrer Motor
These are main parts Number.
Refer to the SVC manual about detailed parts No.
Parts No. can be changed after reporting PCR.
(changed part no. will have the same performance)