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Technical Information
MOP01010029T8
2002.9.9
Microwave Oven
●
All INVERTER MODELS
Subject: This technical information describes the repair procedure for the following inverter circuit boards. *606Y4N10GP
*606Y4L10GP *606Y4V00GP *606Y4V20GP *606Y4V00BP *606Y4J00**
© 2002 Matsushita Electric Industrial Co., Ltd. All rights reserved. Unauthorised copying and distribution is a violation of law.
1
Warning
1. Always unplug the Microwave Oven from the electricity supply, before removing the outer panel.
2. Never touch the inverter PCB with the microwave oven plugged into the electricity supply. The inverter circuit board
handles voltages up to 5000 volts and is very dangerous
3. Do not touch the heat sink during operation of the microwave oven. The heat sink handles high voltage and becomes very
hot.
4. Always discharge the high voltage capacitors located on the inverter circuit board before beginning any troubleshooting.
5. Only test the inverter circuit board by installing it completely into the oven and refitting the outer panel.
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6. Always connect the inverter circuit to earth via the earth plate. It is very dangerous to operate the inverter circuit when it
is not connected to earth.
7. Pbf: Lead free solder has a higher melting point than standard solder; typically the melting point is 30° - 40° C higher.
Use a high temperature soldering iron with temperature control, set it to 370° 10± C.Lead free solder splashes when
heated too high (about 600° C)
2 Discharge the high voltage capacitor
1. Unplug the oven from the mains supply and leave it for more than 30 seconds before removing the outer panel
2. Use an insulated lead wire to short between the anode of Diode D701, and the cathode of diode D702.(See figure 1 for
inverter circuit *606Y4L10GP *606Y4N10GP *E606Y4J00**) or (See figure 2 for inverter *606Y4V00GP
*606Y4V20GP *606Y4V00BP)
Figure 1
Discharging the Capacitors on the inverter circuit *606Y4L10GP *606Y4N10GP *606Y4J00**
Figure 2
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Discharging the capacitors on the inverter circuit *606Y4V00GP *606Y4V20GP *606Y4V00BP
3 Remove the inverter circuit board from the oven.
1. Check the inverter circuit board for cracks, broken components, burnt components and for damaged copper tracks.
4 Check the inverter components using a test meter
Warning
Remove the inverter PCB from the oven before attempting to test any components. Do not try to test any components with the
inverter PCB installed in the microwave oven.
4.1 Check the power transistors (Q701,Q702)
1. Remove the solder holding each leg of the high power transistors to the inverter circuit board.
2. Test the high power transistors for resistance between the Emitter - Collector, Emitter - Gate, Gate - Collector junctions.
Refer to (figure 3) for the expected readings of a functional Power transistor.
Figure 3
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check the resistance across each junction of the power transistors.
4.2 Check the diode-bridge (DB701)
1. Remove the solder holding each leg of the diode-bridge to the inverter circuit board.
2. Check the resistance across each diode in the diode-bridge in both forward and reverse bias. See figure 4 for the expected
reading of a functional diode-bridge.
Figure 4
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Checking the resistance across the bridge-diode
4.3 Check the high voltage capacitors ( C704,C705)
1. Inspect the high voltage capacitors for any visible damage.
2. Remove the capacitor from the inverter circuit board and measure the resistance across the terminals, a defective
capacitor will indicate low resistance. (Short circuit). (Note: On the inverter PCB’s *606Y4V00GP *606Y4V20GP
*606Y4V00BP,the high-voltage capacitors are in parallel with the high-voltage diodes. If these diodes are short circuit,
the capacitors will falsely read short circuit, if they are measured whilst still soldered into the board.).
4.4 Check the high voltage diodes (D701,D702)
1. Remove the high voltage diodes from the inverter circuit board and check the resistance using a meter with a voltage of
more than 9 Volts.
2. Refer to the table (Figure 5) for the expected resistance readings of a functional diode.
Figure 5
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5 Replacing the power transistors (Q701,Q702) and Capacitor C806 on the
inverter circuit board.(*606Y4V00GP)(*606Y4V20GP)(*606Y4V00BP)
If the power transistor’s IGBT’s are defective, replace the 2 power transistors (Q701 and Q702) together with the capacitor
C806. The repair kit A691E4V10GP consists of these 3 components. Figure 6 shows the position of each ofthese components.
Figure 6
Components to replace if IGBT’s are defective
5.1 Replacing Capacitor C806
1. Remove all of the solder from each leg of the capacitor (C806). Remove the capacitor from the board.
2. Place the capacitor in position and carefully solderer each leg. Check that no solder bridges the copper tracks of the
circuit board.
5.2 Replacing the power transistors (Q701,Q702)
1. Remove all of the solder from each leg of the power transistors (Q701,Q702) and the diode bridge(DB701). Use a highpower soldering iron to ensure that the legs of each component are free from the inverter circuit board.
2. Remove all of the solder from each leg of the power transistors (Q701,Q702) and the diode bridge(DB701). Use a highhttp://e-service.panasonic.com.sg/viewing/EUOT/All/TI/PVAccel.html (6 of 15)06-Jun-08 2:49:15 PM
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power soldering iron to ensure that the legs of each component are free from the inverter circuit board.
3. Remove the heat sink with the components attached away from the inverter circuit board.(Figure 7)
4. Remove the defective component by removing the screw securing the component to the heat sink.
5. Clean the surface of the heat sink to remove all dust and debris.(Figure 8)
6. Apply heat sink compound to the surface of the heat sink.(Figure 8)
7. Place the new component in position and replace the screw to secure the component to the heat sink.
8. Place the heat sink and components back in position on the inverter circuit board. Insert the legs of each component legs
completely into the board. Solder each leg into the circuit board, add sufficient solder to withstand the high current.
( Figure 9). Check for dry solder joints and solder bridges between tracks.
Figure 7
Removal of the power transistors and the diode bridge on the inverter PCB *606Y4V00GP *606Y4V20GP *606Y4V00BP
Figure 8
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Clean all debris from the heat sink surface
Figure 9
Add sufficient solder so the joint can withstand high current.
6 Replacing the power transistors (Q701,Q702) on the inverter circuit board
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(*606Y4L10GP)(*606Y4N10GP)(*606Y4V00**)
1. Remove all of the solder from each leg of the power transistors (Q701,Q702) and the diode-bridge(DB701). Use a highpower soldering iron to ensure that the legs of each component are free from the inverter circuit board.
2. Remove the 2 screws holding the heat sink to the circuit board as follows: (Figure 10)
3. Place a small amount of solder onto the tip of the high powered soldering iron.(Figure 10)
4. Position the tip of the screwdriver into the head of the screw, Use the high powered soldering iron to melt the solder
around the screw head; when the solder has melted turn the screw in an anti clockwise direction. Hold the soldering
ironagainst the head of the screw until you have removed the screw from the board. (Figure 10)
5. Remove the heat sink and components from the circuit board.
6. Remove the defective component from the inverter circuit board by removing the screw securing the component to the
heat sink.
7. Clean the surface of the heat sink to remove all dust and debris.(Figure 8)
8. Apply heat sink compound to the surface of the heat sink.(Figure 8)
9. Place the components back in position on the inverter circuit board, insert the component legs of each component
completely into the board. Replace the 2 screws to secure the heat sink. Reapply solder to the head of both screws and
solder thelegs of each component into the circuit board. Add sufficient solder to withstand high current. (Figure 9)
Figure 10
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Removing the heat sink and IGBT’s
7 Testing the repaired inverter circuit board
Warning
Before placing the repaired inverter circuit board into the microwave oven check for any dry joints or bridged solder. Install the
inverter circuit board into the microwave oven to test, do not attempt to test the inverter circuit board using extensioncables.
When fitting the inverter circuit board into the microwave oven make sure you connect the inverter to earth via the earthing
bracket. It is extremely dangerous to operate the inverter circuit with no earth connection.
1. Install the inverter circuit board in the microwave oven. Plug in the connections CN701,CN702 and CN703. Check that
the inverter is connected to earth via the earthing bracket.
2. Connect the oven to a suitable ampere meter to measure the input current during normal microwave operation. (See tools
and jigs on Page for a suitable meter)
3. Operate the microwave oven on high power for one minute.
4. Check the input current. (Refer to the individual service manual for the specified input current for your specific model).
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5. Do not attempt to adjust the variable resistor VR701. Adjustment is only necessary when the high voltage transformer has
been replaced. However, if the high voltage transformer is defective replace the inverter circuit as a complete unit.
6. If the high volatge transformer on the inverter circuit emits a loud noise, refer to the repair procedure below.
8 After replacing the power transistors (Q701), (Q702) and the capacitor C806,
the high voltage transformer emits a loud noise. This affects inverter circuits
(*606Y4V00GP)(*606Y4V20GP)(*606Y4V00BP).
When the power transistors short circuit the power transistor gate resistors may blow. This fault is quite rare, however, if the
high voltage transformer emits a loud noise after you have replaced the power transistors (Q701)(Q702) and capacitor(C806),
replace the resistors: R713 and R714. See figure 11.
Figure 11
Replace R713 and R714 if high voltage transformer is noisy (*606YV00GP) (*606Y4V20GP) (*606Y4V00BP)
9 Schematic diagram (*606Y4V00GP *606Y4V20GP)(*606Y4V00BP)
10 Schematic diagram (*606Y4L10GP) (*606Y4N10GP) (*606Y4J00**)
11 Parts List (*606Y4V00GP) (*606Y4V20GP) (*606Y4V00BP)
1. When ordering replacement parts, please order using the part numbers exactly as shown in the parts list.
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2. Components identified by mark have special characteristics important for safety. When replacing any of these
components, use only the manufacturers specified part.
3. All part numbers are supplied from Microwave Oven Division in Japan
Ref No
Part Number
Description And Specification
C701
ECWF5104N300
Capacitor 0.1mF/500V
C702
ECQE2405T847
Capacitor 4mF/250V
C703
ECWF5454N300
Capacitor 0.45mF /500v
C704 C705
ECWH30822JUA
Capacitor 8200 PF / 3KV
DB701
AESTRBV6206
Diode 15A/600V
D701 D702
A6202-4N10T
HV Diode
D704 D705
AEDNERA1506
Diode Si 1A
D703
AEDNERA3806
Diode Si 0.5A
ZD701
AEDZ10ES2T1
Zener Diode RD10ES2T1
ZD702
AESZ12JS2T1
Zener Diode RD12JS2
L701
A50204T00AP
Choke Coil
Q701
Q702
C806
A691E4V10GP
Transistors (Q701) + (Q702) + Ceramic capacitor (C806) Must be replaced
together
Q703
Q704
2SC3311AQSTA
Transistor
Q705
2SA1309AQSTA
Transistor
R701
AERG419S107M
Bleeder Resistor 100MW
R715
AERGS215J452
Sand Bar resistor 4.5KW 15WW
IC-702 IC-703
AEICP25011HL
Photo-Coupler
IC-801
AN9DB07SB
IC
VR701
AEVTZ6TLT102
Variable Resistor 1KW
T701
A609A4V00GP
HV Transformer
CT701
A66904T00AP
Current Transformer
HS
A66914T00AP
Heat Sink
CN701
AEEMXH00703G Connector
12 Parts List (*606Y4L10GP) (*606Y4N10GP)(*606Y4J00**)
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Remarks
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Ref No
Part Number
Description And Specification
C701
AECQ2G184J21
Capacitor 0.18mF /400V
C702
AECQ2G555JA2
Capacitor 5.5mF /400V
C703
AECQ2E455JC3
Capacitor 4.5mF /250V
C704
C705
ECKK3F362KDU
Ceramic Capacitor 3600PF /3KV
C704
C705
ECWH30362JU
Film Capacitor 3600PF /3KV
D720
AERZ500NR143
Varistor 14D303
DB701
AEDBRBV1306
Diode Si 13A/600V
D701
D702
A6202-1740T
H.V Diode Si 0.35A/8KV
D703
D 704
AEDNERA1506
Diode Si ERA1506
D705
D 707
AEDNERA3806
Diode Si ERA38-06
ZD701
AEDZ15EB2T1
Zener Diode RD15EB2
ZD702
AESZ12JS2T1
Zener Diode RD12JS2
ZD706
ZD703
ZD 704
AEDZ36ES2T1
Zener Diode RD36ES2T1
ZD705
ZD 707
AEDZ8R2ES2T1
Zener Diode RD8 2ES2
Q701
Q702
A691E4J00XN
Transistor (Q701) 1MBA50D060AR + (Q702) 1MBH50D060A
Q703
Q467
2SC2785TFK
Transistor
Q705
Q 708
2SA1175TFK
Transistor
Q709
2SC5201TPE6
Transistor
Q710
2SC3623TLL
Transistor
IC-702
AEICP25011HL
Transistor
IC-701
AN9DB05
IC
L701
A5020-1900
Choke Coil
R701
AERG110F207P
Bleeder resistor 200MW
VR701
EVMAASA00B14 Variable resistor 10KW
R719
AERG15N372J
Sand Bar Resistor 3.7KW 15W
CN701
AEEMMF00703K
Connector 3 pin Black
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Remarks
Or
Must be replaced
together
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CN701
AEEMMF00703R
Connector 3 pin Red
CT701
A66904J00XN
Current Transformer
T701
A609A-1880
HV Transformer
HS
A66914J00XN
Heat Sink
13 Useful tools and Jigs
All of the following test jigs can be ordered form MOD Japan.
1. Power Check Meter. This meter can be used to measure the microwave oven input current and line voltage.
The following plug and outlet arrangements are available
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2. Universal Outlet This is designed to fit all types of plugs including the earth and grounding plugs.
3. Fluorescent light bulb (4W) Part number A600Z-FL4W
This can be used to check microwave oscillation.
Caution
Always place 1 liter of water inside the cavity with this bulb. Do not expose the bulb to microwave energy for longer than
10 seconds. Leaving the bulb in the cavity with microwave oscillation for a long period will cause the bulb to overheat
andburn.
TOP
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