Wednesday, June 22, 2016
PANASONIC Microwave oven NN-CS596A - NN-CS596S - Troubleshooting - Test procedure - Magnetron test - Output power test - self diagnostic
Category: Microwave Oven Repair and Service
Contents of this article
- Magnetron test
- Output Power test
- Self diagnostics
PANASONIC NN-CS596A - NN-CS596S
CAUTIONS TO BE OBSERVED WHEN TROUBLESHOOTING
Unlike many other appliances, the microwave oven is a high voltage, high current device. It is free from danger in ordinary use, though extreme care should be taken during repair.
CAUTION
Servicemen should remove their watches whenever working close to or replacing the magnetron.
Check the grounding
Do not operate on a two wire extension cord. The microwave oven is designed to be grounded when used. It is imperative, therefore, to ensure the appliance is properly grounded before beginning repair work.
Inverter warnings
DANGER, HIGH VOLTAGE AND HIGH TEMPERATURE (HOT/LIVE) OF THE INVERTER POWER SUPPLY
The High Voltage Inverter Power Supply handles very high voltage and current for the magnetron tube. Though it is free from danger in ordinary use, extreme care should be taken during repair.
The aluminum heat sink is also energized with high voltage (HOT), do not touch when the AC input terminals are energized. The power device Collector is directly connected to the aluminum heat sink. The aluminum heat sink may be HOT due to heat energy, therefore, extreme care should be taken during servicing.
CAUTION
Servicemen should remove their watches whenever working close to or replacing the magnetron.
Check the grounding
Do not operate on a two wire extension cord. The microwave oven is designed to be grounded when used. It is imperative, therefore, to ensure the appliance is properly grounded before beginning repair work.
Inverter warnings
DANGER, HIGH VOLTAGE AND HIGH TEMPERATURE (HOT/LIVE) OF THE INVERTER POWER SUPPLY
The High Voltage Inverter Power Supply handles very high voltage and current for the magnetron tube. Though it is free from danger in ordinary use, extreme care should be taken during repair.
The aluminum heat sink is also energized with high voltage (HOT), do not touch when the AC input terminals are energized. The power device Collector is directly connected to the aluminum heat sink. The aluminum heat sink may be HOT due to heat energy, therefore, extreme care should be taken during servicing.
WARNING FOR INVERTER POWER SUPPLY GROUNDING
Check the High Voltage Inverter Power Supply circuit grounding. The high voltage inverter power supply circuit board must have a proper chassis ground. The inverter grounding bracket must be connected to the chassis. If the inverter board is not grounded it will expose the user to very high voltages and cause extreme DANGER! Be sure that the inverter circuit is properly grounded via the inverter grounding bracket.
Check the High Voltage Inverter Power Supply circuit grounding. The high voltage inverter power supply circuit board must have a proper chassis ground. The inverter grounding bracket must be connected to the chassis. If the inverter board is not grounded it will expose the user to very high voltages and cause extreme DANGER! Be sure that the inverter circuit is properly grounded via the inverter grounding bracket.
WARNING DISCHARGE THE HIGH VOLATGE CAPACITORS
For about 30 seconds after the oven is turned off, an electric charge remains in the high voltage capacitors in the Inverter Power Supply circuit board. When replacing or checking parts, remove the power plug from the outlet and short the inverter output terminal of the magnetron filament terminals to the chassis ground with an insulated handle screwdriver to discharge. Please be sure to touch the chassis ground side first and then short to the output terminals.
For about 30 seconds after the oven is turned off, an electric charge remains in the high voltage capacitors in the Inverter Power Supply circuit board. When replacing or checking parts, remove the power plug from the outlet and short the inverter output terminal of the magnetron filament terminals to the chassis ground with an insulated handle screwdriver to discharge. Please be sure to touch the chassis ground side first and then short to the output terminals.
Discharging the high voltage capacitors
WARNING
There is high voltage present with high current capabilities in the circuits of the primary and secondary windings, choke coil and heat sink of the inverter. It is extremely dangerous to work on or near these circuits with the oven energized. DO NOT measure the voltage in the high voltage circuit including the filament voltage of the magnetron. WARNING
Never touch any circuit wiring with your hand or with an insulated tool during operation.
Confirm before repair
1. Before repair or replacement of parts, ensure to take out the water tank from microwave oven. Further more, use drainage function, to drain the water remaining in the water pipes and tubes into oven cavity.
2. Wipe up the oven cavity.
WARNING
Before beginning repair work, make sure that there is no water in microwave oven, otherwise the water might invade the electric parts and will cause short circuit even result in electric shock.
Part replacement
When any part or component is to be replaced, always ensure that the power cord is removed from the wall outlet.
When the 10A fuse is blown due to the operation of the short switch
WARNING
When the 10A 220V fuse is blown due to the operation of the interlock monitor switch, replace all of the components (primary latch switch, short switch and power relay B (RY1)).
1. This is mandatory. Refer to “adjustments and measurements” for the location of these switches.
2. When replacing the fuse, confirm that it has the appropriate rating for these models.
3. When replacing faulty switches, be sure the mounting tabs are not bent, broken or deficient in their ability to hold the switches.
Avoid inserting nails, wire etc. through any holes in the unit during operation
Never insert a wire, nail or any other metal object through the lamp holes on the cavity or any holes or gaps, because such objects may work as an antennaand cause microwave leakage.
WARNING
There is high voltage present with high current capabilities in the circuits of the primary and secondary windings, choke coil and heat sink of the inverter. It is extremely dangerous to work on or near these circuits with the oven energized. DO NOT measure the voltage in the high voltage circuit including the filament voltage of the magnetron. WARNING
Never touch any circuit wiring with your hand or with an insulated tool during operation.
Confirm before repair
1. Before repair or replacement of parts, ensure to take out the water tank from microwave oven. Further more, use drainage function, to drain the water remaining in the water pipes and tubes into oven cavity.
2. Wipe up the oven cavity.
WARNING
Before beginning repair work, make sure that there is no water in microwave oven, otherwise the water might invade the electric parts and will cause short circuit even result in electric shock.
Part replacement
When any part or component is to be replaced, always ensure that the power cord is removed from the wall outlet.
When the 10A fuse is blown due to the operation of the short switch
WARNING
When the 10A 220V fuse is blown due to the operation of the interlock monitor switch, replace all of the components (primary latch switch, short switch and power relay B (RY1)).
1. This is mandatory. Refer to “adjustments and measurements” for the location of these switches.
2. When replacing the fuse, confirm that it has the appropriate rating for these models.
3. When replacing faulty switches, be sure the mounting tabs are not bent, broken or deficient in their ability to hold the switches.
Avoid inserting nails, wire etc. through any holes in the unit during operation
Never insert a wire, nail or any other metal object through the lamp holes on the cavity or any holes or gaps, because such objects may work as an antennaand cause microwave leakage.
Confirm after repair
1. After repair or replacement of parts, make sure that the screws of the oven, etc. are neither loose or missing. Microwave might leak if screws are not properly tightened.
2. Make sure that all electrical connections are tight before inserting the plug into the wall outlet.
3. Check for microwave energy leakage. (Refer to procedure for measuring microwave energy leakage).
CAUTION MICROWAVE RADIATION USE CAUTION NOT TO BECOME EXPOSED TO RADIATION FROM THE MICROWAVE MAGNETRON OR OTHER PARTS CONDUCTING MICROWAVE ENERGY. IMPORTANT NOTICE
The following components have potentials above 2000V while the appliance is operated.
# Magnetron
# High voltage transformer (Located on inverter (U))
# High voltage diodes (Located on inverter (U))
# High voltage capacitors (Located on inverter (U))
Pay special attention to these areas.
When the appliance is operated with the door hinges or magnetron installed incorrectly, the microwave leakage can exceed more than 5mW/cm2. After repair or exchange, it is very important to check if the magnetron and the door hinges are correctly installed.
IMPORTANT NOTICE
After repair or replacement of parts, make sure that all the water pipes and tubes are properly connected, otherwise the water might invade the electric parts and will cause short circuit even result in electric shock.
1. After repair or replacement of parts, make sure that the screws of the oven, etc. are neither loose or missing. Microwave might leak if screws are not properly tightened.
2. Make sure that all electrical connections are tight before inserting the plug into the wall outlet.
3. Check for microwave energy leakage. (Refer to procedure for measuring microwave energy leakage).
CAUTION MICROWAVE RADIATION USE CAUTION NOT TO BECOME EXPOSED TO RADIATION FROM THE MICROWAVE MAGNETRON OR OTHER PARTS CONDUCTING MICROWAVE ENERGY. IMPORTANT NOTICE
The following components have potentials above 2000V while the appliance is operated.
# Magnetron
# High voltage transformer (Located on inverter (U))
# High voltage diodes (Located on inverter (U))
# High voltage capacitors (Located on inverter (U))
Pay special attention to these areas.
When the appliance is operated with the door hinges or magnetron installed incorrectly, the microwave leakage can exceed more than 5mW/cm2. After repair or exchange, it is very important to check if the magnetron and the door hinges are correctly installed.
IMPORTANT NOTICE
After repair or replacement of parts, make sure that all the water pipes and tubes are properly connected, otherwise the water might invade the electric parts and will cause short circuit even result in electric shock.
COMPONENT TEST PROCEDURE
Primary latch switch (door switch and power relay B) interlocks
1. Unplug lead connectors to Power Relay B and verify open circuit of the power relay B 1-2 terminals.
2. Unplug lead connectors to Primary Latch Switch and Door Switch.
3. Test the continuity of switches at door opened and closed positions with ohm meter (low scale). Normal continuity readings should be as follows.
1. Unplug lead connectors to Power Relay B and verify open circuit of the power relay B 1-2 terminals.
2. Unplug lead connectors to Primary Latch Switch and Door Switch.
3. Test the continuity of switches at door opened and closed positions with ohm meter (low scale). Normal continuity readings should be as follows.
| | Door Closed | Door Opened |
| Primary Latch switch | 0 ohm (Close) | Infinite ohm (Open) |
| Door Switch | 0 ohm (Close) | Infinite ohm (Open) |
| Power Relay B | (Close) | Infinite ohm (Open) |
Short switch & monitor
1. Unplug lead wires from Inverter Power Supply primary terminals.
2. Connect test probes of ohm meter to the disconnected leads that were connected to Inverter Power Supply .
3. Test the continuity of short switch with door opened and closed positions using lowest scale of the ohm meter. Normal continuity readings should be as follows.
2. Connect test probes of ohm meter to the disconnected leads that were connected to Inverter Power Supply .
3. Test the continuity of short switch with door opened and closed positions using lowest scale of the ohm meter. Normal continuity readings should be as follows.
Door open 0 ohms
Door closed infinite ohms
Magnetron
Continuity checks can only indicate an open filament or a shorted magnetron. To diagnose for an open filament or shorted magnetron.
1. Isolate magnetron from the circuit by disconnecting the leads.
2. A continuity check across magnetron filament terminals should indicate one ohm or less.
3. A continuity check between each filament terminal and magnetron case should read open.
Continuity checks can only indicate an open filament or a shorted magnetron. To diagnose for an open filament or shorted magnetron.
1. Isolate magnetron from the circuit by disconnecting the leads.
2. A continuity check across magnetron filament terminals should indicate one ohm or less.
3. A continuity check between each filament terminal and magnetron case should read open.
Measurement of microwave output
The output power of the magnetron can be determined by performing IEC standard test procedures. However, due to the complexity of IEC test procedures, it is recommended to test the magnetron using the simple method outlined below.
The output power of the magnetron can be determined by performing IEC standard test procedures. However, due to the complexity of IEC test procedures, it is recommended to test the magnetron using the simple method outlined below.
Necessary Equipment:
# 1 litre beaker
# Glass thermometer
# Wrist watch or stopwatch
NOTE:
Check the line voltage under load. Low voltage will lower the magnetron output. Take the temperature readings and heating time as accurately as possible.
1. Fill the beaker with exactly one litre of tap water. Stir the water using the thermometer and record the water’s temperature. (recorded as T1).
2. Place the beaker on the center of glass tray. Set the oven for High power and heat it for exactly one minute.
3. Stir the water again and read the temperature of the water. (recorded as T2).
4. The normal temperature rise at High power level for each model is as shown bellow.
# 1 litre beaker
# Glass thermometer
# Wrist watch or stopwatch
NOTE:
Check the line voltage under load. Low voltage will lower the magnetron output. Take the temperature readings and heating time as accurately as possible.
1. Fill the beaker with exactly one litre of tap water. Stir the water using the thermometer and record the water’s temperature. (recorded as T1).
2. Place the beaker on the center of glass tray. Set the oven for High power and heat it for exactly one minute.
3. Stir the water again and read the temperature of the water. (recorded as T2).
4. The normal temperature rise at High power level for each model is as shown bellow.
RATED OUTPUT - 1000W
TEMPERATURE RISE - Min.8.5°C
Self diagnostic display
Oven has self diagnostic function but it will not be activated in normal operation mode.
To show self diagnostic result, please take the following steps.
1. Firstly, you must program the DPC into TEST MODE (Plug-in oven > press Timer/Clock pad twice > press Start pad once >press Micro Power pad once.)
2. Keep pressing Timer/Clock pad for more than 2 seconds until buzzer beeps.
3. Press Start pad twice, oven will show error code.
NOTE:
1. If any error was observed, it will be kept in memory up to 3 errors in the past. If there are more than 4 cases, the memory will renew the latest 3 errors codes.
2. Press Start pad again, one more older error code will be displayed.
3. If the oven is ok, it will show “000” and blinking.
4. Error cod list
H** Hardware problem, oven itself has problem.
U** Usage problem such as run out of water and oven itself works well.
Oven has self diagnostic function but it will not be activated in normal operation mode.
To show self diagnostic result, please take the following steps.
1. Firstly, you must program the DPC into TEST MODE (Plug-in oven > press Timer/Clock pad twice > press Start pad once >press Micro Power pad once.)
2. Keep pressing Timer/Clock pad for more than 2 seconds until buzzer beeps.
3. Press Start pad twice, oven will show error code.
NOTE:
1. If any error was observed, it will be kept in memory up to 3 errors in the past. If there are more than 4 cases, the memory will renew the latest 3 errors codes.
2. Press Start pad again, one more older error code will be displayed.
3. If the oven is ok, it will show “000” and blinking.
4. Error cod list
H** Hardware problem, oven itself has problem.
U** Usage problem such as run out of water and oven itself works well.
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