Panasonic NN-ST658W, NN-SD698S, NN-ST678S User Manual

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NN-SD698S NN-ST678S NN-ST658W
RPH (LATIN AMERICA) RUH (MEXICO)
ORDER NO.PHAMOS0801002C3
E1
Microwave Oven
© 2008 Panasonic Home Appliances Microwave Oven (Shanghai) Co., Ltd. All rights reserved. Unauthorized copying and distribution is a violation of law.
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CONTENTS
Page Page
1 SCHEMATIC DIAGRAM 5 2 DESCRIPTION OF OPERATING SEQUENCE
2.1. Variable power cooking control
2.2. Inverter power supply circuit
2.3. Inverter defrost
2.4. Sensor cooking
2.5. Sensor reheat
2.6. Steam sensor and digital programmer circuit
2.7. Thermistor
3 CAUTIONS TO BE OBSERVED WHEN TROUBLESHOOTING
3.1. Check the grounding
3.2. Inverter warnings
3.3. Part replacement.
3.4. When the 20A fuse is blown due to the malfunction of the monitor interlock switch:
3.5. Avoid inserting nails, wire etc. through any holes in the unit during operation.
3.6. Verification after repair
3.7. Sharp edges
4 DISASSEMBLY AND PARTS REPLACEMENT PROCEDURE
4.1. Magnetron
4.2. Digital programmer circuit (D.P.C)
4.3. Low voltage transformer and/or power relays (RY1, RY2)
4.4. Fan motor
4.5. Door assembly
4.6. Turntable motor
4.7. Steam sensor
4.8. Inverter power supply
5 COMPONENT TEST PROCEDURE
5.1. Primary, Secondary Latch Switch interlocks & Power Relay RY1
5.2. Monitor Interlock Switch
5.3. Magnetron
5.4. key board membrane (Membrane switch assembly)
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5.5. Inverter power supply (U)
5.6. Temperature thermistor
6 MEASUREMENTS AND ADJUSTMENTS
6.1. Adjustment of primary latch switch, secondary latch switch and monitor interlock switch.
6.2. Measurement of microwave output
7 PROCEDURE FOR MEASURING MICROWAVE ENERGY
LEAKAGE
7.1. Equipment
7.2. Procedure for measuring radiation leakage
7.3. Record keeping and notification after measurement
7.4. At least once a year, have the radiation monitor checked for calibration by its manufacturer.
8 TROUBLESHOOTING GUIDE
8.1. (Troubleshooting) Oven stops operation during cooking
8.2. (Troubleshooting) Other problems
8.3. Troubleshooting of inverter circuit (U) and magnetron
8.4. SIMPLE WAY OF H.V. INVERTER/MAGNETRON TROUBLESHOOTING
8.5. H.V.INVERTER BOARD MAIN PARTS LIST (F606Y8M00AP)
8.6. How to check the semiconductors using an OHM meter
9 EXPLODED VIEW AND PARTS LIST
9.1. EXPLODED VIEW
9.2. PARTS LIST
9.3. WIRING MATERIALS
9.4. DOOR ASSEMBLY
9.5. ESCUTCHEON BASE ASSEMBLY
9.6. PACKING AND ACCESSORIES
10 DIGIT AL PROGRAMMER CIRCUIT
10.1. NN-SD698S
10.2. NN-ST678S
10.3. NN-ST658W
10.4. PARTS LIST
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1 SCHEMATIC DIAGRAM
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2 DESCRIPTION OF OPERATING SEQUENCE
2.1. Variable power cooking control
High Voltage Inverter Power Supply (U) controls output power by the signal from Digital Programmer Circuit (DPC). Power relay always stay on, but PWM (Pulse Width Modulation) signal controls microwave output power.
NOTE:
The ON/OFF time ratio does not correspond with the percentage of microwave power since approximately 2 seconds are required for heating of magnetron filament.
POWER SETTING OUTPUT
HIGH P10 100% 22 0
MEDIUM-HIGH P7 70% 22 0 MEDIUM P6 60% 22 0
MEDIUM-LOW P3 30% 22 0
DEFROST P3 30% 22 0
Variable Power Cooking
POWER(%)
APPROX.
P9 90% 22 0 P8 80% 22 0
P5 50% 22 0 P4 40% 22 0
P2 20% 15 7 P1 10% 8 14
MANUAL MICROWAVE
DUTY
ON(SEC) OFF(SEC)
2.2. Inverter power supply circuit
The Inverter Power Supply circuit powered from the line voltage, 120V 60Hz AC input supplies 4,000V DC to the magnetron tube, and functions in place ofthe H.V. transformer, the H.V. capacitor and H.V. diode.
1. The AC input voltage 120V 60Hz is rectified to DC voltage
immediately.
2. DC voltage will be supplied to the switching devices called
IGBT. These devices are switched ON-OFF by the 20 to 40 kHz PWM (pulse width modulation) signal from the microcomputer in the DPC.
3. This drives the High voltagetransformer to increase voltage
up to 2,000V AC.
4. Then the half-wave doubler voltage rectifier circuit,
consisting of the H.V. diodes and capacitors, generates the necessary 4,000V DC needed for the magnetron.
5. Output power of the magnetron tube isalways monitored by
the signal output from the current transformer built into the inverter circuit.
6. This signal is fed back to the microcomputer in the DPC to
determine operating conditions and output necessary to control PWM signal to the Inverter Power Supply for control of the output power.
2.3. Inverter defrost
When the Auto Control feature is selected and the Start pad is tapped:
1. The digital programer circuit determines the power level and cooking time to complete cooking and indicates the operating state in the display window. Table shows the corresponding cooking times for respective serving by categories.
Inverter Turbo Defrost
SELECTED WEIGHT COOKING TIME
1.0 LB 5 min.00 sec.
2. When cooking time in the display window has elapsed, the oven turns off automatically by a control signal from the digital programmer circuit.
2.4. Sensor cooking
Auto sensor cooking without setting a power level or selecting a time. All that is necessary is to select an Auto Sensor Program before starting to cook.
Understanding Auto Sensor Cooking
As the food cooks, a certain amount of steam is produced. If the food is covered, this steam builds up and eventually escapes from the container. In Auto Sensor Cooking, a carefully designed instrument, called the steam sensor element, senses this escape of steam. Then, based upon the Auto Sensor Program selected, the unit will automatically determine the correct power level and the proper length of time it will take to cook the food.
NOTE:
Auto Sensor Cooking is successful with the foods and recipes found in the Auto Sensor Cooking Guide. Because of the vast differences in food composition, items not mentioned in the Cooking Guide should be prepared in the microwave oven using power select and time features. Please consult Variable Power Microwave Cookbook for procedures.
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Explanation of the Auto Sensor Cooking process
1. During the first 10 second period there is no microwave activity. When calculating the T2 time by using the formula below make sure this 10 seconds is subtracted from the T1 time. In other words, T1 time starts at the end of the 10 second period.
2. T1 time The total amount of time it takes themicrowave oven to switch to T2 time after the 10second period.
3. T2 time When the steam escapes from the cooking container placed in the oven, the steam sensor detects it and the microprocessor calculates the balance of cooking time. This T2 time is then shown in the display and begins counting down.
Balance of cooking time (T2 time)
The balance of cooking time which is called T2time, can be calculated by the following formula. T2 time (in sec.) = T1 time X K factor
NOTE:
Remember, the T1 time starts after the 10 second period. The coefficient K is programmed into the microprocessor memory and they are listed in the following tables along with the P1 and P2 powers.
NOTE:
When "More" or "Less" pad is selected, the K factor varies resulting in T2 time to be increased or decreased.
Example of calculating the T2 time
Example 1: If the T1 time is measured to be 2 minutes and 40 seconds after the 10 second period, and the Auto program selected is Oatmeal:
T2 = T1 × K = 2 min. and 40 sec. × 0.1 = 160sec. × 0.1 = 16 sec.
Category P1
Power
Oatmeal HIGH HIGH 0.1
P2
Power
K Factor
Standard
2.5. Sensor reheat
Auto Sensor Reheat is a quick and easy way to reheat refrigerated and room temperature foods.
Simply press the reheat pad. There is no need to select power level and cooking time.
NOTE:
The Auto Sensor Reheat process is same as Auto Sensor Cooking process.
Category P1
Power
Sensor Reheat HIGH MEDIUM 0.3
P2
Power
K Factor
Standard
2.6. Steam sensor and digital programmer circuit
In order to determine if the steam sensor function of the digital programmer circuit is working, do the following test.
1. Place a water load (150 cc) in the oven.
2. Tap Sensor Reheat pad.
3. Tap Start pad.
4. Steam Sensor detects steam about 1.5 to 4 minutes after
the Start pad is tapped.
5. T1 time cooking automatically switches to remaining time
for cooking (T2).
6. The remaining cooking time (T2) appears in display
window. If the following cooking time appears, Steam Sensor function is normal.
T1 TIME T2 TIME (Remainingcooking time)
1 Min. 30 Sec. ~ 4 Min. 27 Sec. ~ 1Min.12 Sec.
2.7. Thermistor
The thermistor which fixed on magnetron detects magnetron temperature and make power down when the temperature becomes abnormal high. A normal thermistor´s resistance values for temperature ranges between 75-85 degree F is from 37kto 57k.
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3 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 and rings whenever working close to or replacing the magnetron.
3.1. 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.
3.2. Inverter warnings
WARNING HIGH VOLTAGE AND HIGHTEMPERATURE
(HOT/LIVE) OF THE INVERTERPOWER SUPPLY (U)
The High Voltage Inverter Power Supply generates 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.
Grounding of the inverter circuit board
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 of 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 contact the chassis ground side first and then short to the output terminal.
H.V. Inverter warning
WARNING FOR INVERTER POWER SUPPLY (U)
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 plate 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 plate.
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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 sinkof 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.
3.3. Part replacement.
When troubleshooting any part or component is to be replaced, always ensure that the power cord is unplugged from the wall outlet.
3.4. When the 20A fuse is blown due to the malfunction of the monitor interlock switch:
WARNING
When the 20A 120V fuse is blown due to the malfunction of the monitor interlock switch, replace all of the components (primary latch switch, monitor interlock switch and power relay RY1).
1. This is mandatory. Refer to “measurements and adjustments” 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.
3.5. Avoid inserting nails, wire etc. through any holes in the unit during operation.
3.6. Verification after repair
1. After repair or replacement of parts, make sure that the screws of the oven, etc. are neither loosen or missing. Microwave energy 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 OF MICROWAVE RADIATION LEAKAGE
USE CAUTION NOT TO BECOME EXPOSED TO RADIATION FROM THE MICROWAVE MAGNETRON OR OTHER PARTS CONDUCTING MICROWAVE ENERGY.
IMPORTANT NOTICE
1. 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.
2. When the appliance is operated with the door hinges or
magnetron installed incorrectly, the microwave leakage can exceed more than 5mW/cm exchange, it is very important to check if the magnetron and the door hinges are correctly installed.
2
. After repair or
3.7. Sharp edges
CAUTION
Please use caution when disassembling or reassembling internal parts. Some exposed edges may be sharp to the touch and can cause injury if not handled with care.
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 antenna and cause microwave leakage.
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4 DISASSEMBLY AND PARTS REPLACEMENT
PROCEDURE
4.1. Magnetron
1. Discharge high voltage charge.
2. Remove 1 screw holding air guide A on the oven cavity.
3. Remove 1 screw holding air guide A on the magnetron.
4. Remove 1 screw holding air guide B.
5. Remove 1 screw holding themistor.
6. Disconnect 2 high voltage lead wires from magnetron filament terminals.
7. Remove 4 screws holding the magnetron.
NOTE:
After replacement of the magnetron, tighten mounting screws properly in an x pattern, making sure there is no gap between the waveguide and the magnetron to prevent microwave leakage.
CAUTION
When replacing the magnetron, be sure the antenna gasket is in place.
4.2. Digital programmer circuit (D.P.C)
CAUTION:
Be sure to ground any static electric charge built up in your body before handling the DPC.
1. Disconnect all connectors from D.P.C.
2. Remove 1 grounding screw.
3. Remove 1 screw holding escutcheon base and slide the
escutcheon base upward slightly.
4. Remove all screws holding D.P.C. board on escutcheon
base.
5. Separate D.P.C board from tabs on the escutcheon base
and remove D.P.C board.
To replace membrane key board
6. Use tools such as kinfe etc. to lift the edge of escutcheon
sheet and peel off escutcheon sheet & key board membrane completely from escutcheon base.
NOTE:
1. The membrane key board is attached to the
escutcheon base with double faced adhesive tape. Therefore, applying hot air such as using a hair dryer is recommended for smoother removal.
2. When installing the new key board membrane, make
sure that the surface of escutcheon base is clean to prevent a malfunction or shorted contacts.
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4.3. Low voltage transformer and/or power relays (RY1, RY2)
CAUTION:
Be sure to ground any static electric charge built up in your body before handling the DPC.
1. Replace D.P.C. board.
(A) Using solder wick or a desoldering tool and 30W soldering iron carefully remove all solder from the terminal pins of the low voltage transformer and/or power relays.
CAUTION:
Do not use a soldering iron or desoldering tool of more than 30 watts on D.P.C. contacts.
(B) With all the terminal pins cleaned and separated from D.P.C. contacts, remove the defective transformer/power relays, Replace components making sure all terminal pins are inserted completely resolder all terminal contacts carefully.
4.4. Fan motor
1. Disconnect 2 lead wires from fan motor terminals.
2. Remove 2 screws at location on oven attaching orifice
assembly.
3. Remove orifice assembly from oven assembly.
4. Remove fan blade from the fan motor shaft by pulling it
straight out.
5. Remove 2 screws holding fan motor to orifice.
4.5. Door assembly
1. Remove door C from door E by carefully pulling outward, starting from upper right hand corner using a flat blade screwdriver.
2. Separate door E from tabs on door A and remove door A.
3. Open Door E at the opening angle of approximately
10°(Note: The door cannot be removed if the opening angle is greater than 10°).
4. Remove the door E from its hinges by pushing the door E upward and out.
5. Remove door screen B from door A.
6. Remove door key and door key spring.
7. Replace other components.
To re-install components:
1. Place the door’s lower hinge pin into the bottom hinge
hole.
2. Use your left index finger to support the door’s lower
hinge pin while guiding the door’s upper hinge pin into the top hinge hole.
3. Lower your finger to seat the door onto the hinges.
NOTE:
Adjust so that the upper portion of the door will touch firmly to the oven cavity front plate, without pushing the door. If the door assembly is not mounted properly, microwave power may leak from the clearance between the door and oven.
NOTE:
Always perform the microwave leakage measurement test after installation and adjustment of door assembly.
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4.6. Turntable motor
1. Remove the motor cover by breaking off at the 8 spots indicated by arrows with a cutter or the like.
NOTE:
After removing the motor cover, be sure that cut portions are properly trimmed or bent to the inside so that no sharp edges will be exposed to outside.
2. Disconnect 2 lead wires connected to the turntable motor.
3. Remove the turntable motor by removing screw.
4.7. Steam sensor
1. Disconnect connector CN2 from digital programmer circuit board.
2. Disengage catch hooks on sensor cover C from orifice.
3. Remove steam sensor from orifice.
NOTE:
When installing the steam sensor, make sure that the direction of steam sensor is as shown in figure.
NOTE:
After reinstalling the new turntable motor and reconnecting the 2 lead wires, reinstall the motor cover by rotating it around 180, tucking the 2 tabs under the base in the 2 provided slots, then screw the single tab to the base using a 4mm × 6mm screw.
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4.8. Inverter power supply
CAUTIONS
1. Always leave the grounding plate in place.
2. Always securely tighten the ground screw through the bottom of the chassis (base).
3. Securely connect 3 lead wire connectors.
4. Make sure the heat sink has enough space (gap) from the oven. Take special care not to dress any lead wire over the aluminum heat sink because it is hot.
1. Discharge high voltage charge.
2. Remove the H.V.lead wire from magnetron terminals.
3. Disconnect 2 connectors from CN701 & CN702 on H.V.Inverter(U).
4. Remove 1 screw holding grounding plate to the base.
6. Press 1 encircled locking tab and then slide 4 locking tabs of Inverter bracket at the bottom of the base in direction of arrows.
7. Remove 1 screw holding H.V.Inverter to Inverter bracket.
5. Bend back 1 locking metal tab on the base.
8. Remove 1 screw holding grounding plate to H.V. Inverter.
9. Seperate H.V. Inverter from Inverter bracket by freeing 3 catch hooks on the Inverter bracket.
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5 COMPONENT TEST PROCEDURE
WARNING
1. High voltage is present at the output terminals of the High Voltage Inverter (U) including aluminum heat sink during any cook cycle.
2. It is neither necessary noradvisabletoattempt measurement of the high voltage.
3. Before touching any oven components, or wiring, always unplug the power cord and discharge the high voltage capacitors (see page
8).
5.1. Primary, Secondary Latch Switch interlocks & Power Relay RY1
1. Unplug lead connectors to Power Relay RY1 and verify
open circuit of the Power Relay RY1 1-2 terminals.
2. Unplug lead connectors to Primary Latch Switch and
Secondary Latch 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(Close) (Open) Secondary Latch Switch 0(Close) (Open) Power Relay RY1 (Open) (Open)
5.3. 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.
5.2. Monitor Interlock Switch
1. Unplug lead wires from Inverter Power Supply (U) primary terminals.
2. Connect test probes of ohm meter to the disconnected leads that were connected to Inverter Power Supply (U).
3. Test the continuity of Monitor Interlock Switch with door opened and closed positions using lowest scale of the ohm meter.
Normal continuity readings should be as follows.
Door Opened Door Closed
0(Close) (Open)
5.4. key board membrane (Membrane switch assembly)
Check continuity between switch terminals, by tapping an appropriate pad on the key board. The contacts assignment of the respective pads on the key board is as shown in digital programmer circuit.
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5.5. Inverter power supply (U)
DO NOT try to REPAIR H.V. Inverter power supply (U). Replace complete H.V. Inverter(U) Unit.
NN-SD698S / NN-ST678S / NN-ST658W
5. Program oven at High power for 1 minute and press [Start] pad.
a. After approximately 3 seconds, oven stops operating. b. During oven operation, the input current is
approximately 0.4A.
INPUT CURRENT FAILURE CODE
Unplug CN701 0.4A Oven stops in 3
seconds after started.
If both a and b check OK, the Inverter Power Supply (U) can be determined to be OK.
5.6. Temperature thermistor
These sensor monitors the heat produced by the heater circuit and maintains the magnetron temperature which user had selected. Normal room temperature 10°C to 30°C, the reading across the temperature thermistor should be as follows.
TEMP MAGNETRON THERMISTOR 100°C 30-60K
25°C 700K-1.5M
WARNING: HIGH VOLTAGE
Test if failure codes H95, H97 or H98 appear when performing the following procedure. It is recommended to use an AC line input current ammeter for testing.
Test 1
1. With the oven unit’s AC power supply cord is unplugged from the wall outlet, unplug the 2 pin H.V. connector CN703 from the magnetron tube.
2. Place 1 liter of water load into oven cavity.
3. Plug in the oven’s AC power supply cord into outlet.
4. Program DPC. a. Press Timer/Clock b. Press Start c. Press Power Level
pad twice.
pad once.
pad once.
5. Program oven at High power for 1 minute and press [Start] pad.
a. After approximately 37 seconds, oven stops operating. b. During oven operation, the input current is
approximately 0.5 to 1A. If both a and b are OK, proceed to test 2.
INPUT CURRENT FAILURE CODE
Unplug CN703 0.5 to 1A Oven stops in 37
seconds after started.
If the resistance reading is out of the range stated here, the thermistor is detective and must be replaced.
Test 2
Continued from Test 1
1. Unplug the oven’s AC power supply cord from outlet.
2. Unplug 3 pin connector CN701. CN703 remains unplugged.
3. Plug in the oven’s AC power supply cord into outlet.
4. Program DPC. a. Press Timer/Clock b. Press Start c. Press Power Level
pad twice.
pad once.
pad once.
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6 MEASUREMENTS AND ADJUSTMENTS
6.1. Adjustment of primary latch switch, secondary latch switch and monitor interlock switch.
1. Mount the Primary latch switch, the Secondary latch switch
and the Monitor interlock switch to the door hook assembly as shown in illustration.
NOTE:
No specific individual adjustments during installation of the Primary latch switch, Secondary latch switch or Monitor interlock switch to the door hook are required.
2. When mounting the door hook assembly to the oven
assembly, adjust the door hook assembly by moving it in the direction of the arrows in the illustration so that the oven door will not have any play in it. Check for play in the door by pulling the door assembly. Make sure that the latch keys move smoothly after adjustment is completed. Completely tighten the screws holding the door hook assembly to the oven assembly.
3. Reconnect the monitor interlock switch and check the
continuity of the monitor circuit and all latch switches again by following the component test procedures.
6.2. 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.
Necessary Equipment: *1 liter 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 liter 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 in table.
TABLE (1L-1min. test)
RATED OUTPUT TEMPERATURE RISE
1200W Min. 18.5°F(10.3°C) 1300W Min. 19.8°F(11.1°C)
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7 PROCEDURE FOR MEASURING MICROWAVE ENERGY
LEAKAGE
7.2.1. Measurement with the outer panel removed.
Whenever you replace the magnetron, measure for radiation leakage before the outer panel is installed and after all necessary components are replaced or adjusted. Special care should be taken in measuring around the magnetron.
7.1. Equipment
Electromagnatic radiation monitor
Glass thermometer 212°F or 100°C
600cc glass beaker
7.2. Procedure for measuring radiation leakage
Note before measuring:
Do not exceed meter full scale deflection. Leakage monitor
should initially be set to the highest scale.
To prevent false readings, the test probe should be held by
the grip portion of the handle only and moved along the shaded area in Figure no faster than 1 inch/sec (2.5cm/sec).
Leakage with the outer panel removed: less than 5mW/cm
Leakage for a fully assembled oven with door normally
closed: less than 2mW/cm
Leakage for a fully assembled oven [Before the latch switch
(primary) is interrupted] while pulling the door: less than 2mW/cm
1. Pour 275 ± 15cc (9ozs
water in a beaker which is graduated to 600cc, and place in the center of the oven.
2. Set the radiation monitor to 2450MHz and use it following
the manufacturer´s recommended test procedure to assure correct results.
3. When measuring the leakage, always use the 2 inch (5cm)
spacer supplied with the probe.
4. Tap the start button or set the timer and with the magnetron
oscillating, measure the leakage by holding the probe perpendicular to the surface being measured.
2
.
2
.
s
± 1/2oz) of 20°C ± 5°C (68° ± 9°F)
7.2.2. Measurements with a fully assembled oven.
After all components, including outer panel are fully assembled, measure for radiation leakage around the door periphery, the door viewing window, the exhaust opening, control panel and air inlet openings.
7.3. Record keeping and
notification after measurement
After any adjustment or repair to a microwave oven, a
leakage reading must be taken. Record this leakage reading on the repair ticket even if it is zero.
2
.
A copy of this repair ticket and the microwave leakage reading should be kept by repair facility.
Should the radiation leakage be more than 2 mW/cm
determining that all parts are in good condition, functioning properly, and genuine replacement parts as listed in this manual have been used.
2
after
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7.4. At least once a year, have the radiation monitor checked for calibration by its manufacturer.
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8 TROUBLESHOOTING GUIDE
DANGER: HIGH VOLTAGES
1. DO NOT RE-ADJUST PRESET CONTROL on the H.V.Inverter (U). It is very dangerous to repair or adjust without proper test equipment because this circuit generates very large current and high voltage. Operating a misaligned inverter circuit is dangerous.
2. Ensure proper grounding before troubleshooting.
3. Be careful of the high voltage circuitry, taking necessary precautions when troubleshooting.
4. Discharge high voltage remaining in the H.V.Inverter (U).
5. When checking the continuity of the switches or the H.V.Inverter, disconnect one lead wire from these parts and then check continuity with the AC plug removed. Doing otherwise may result in a false reading or damage to your meter. When disconnecting a plastic connector from a terminal, you must hold the plastic connector instead of the lead wire and then disconnect it, otherwise lead wire may be damaged or the connector cannot be removed.
6. Do not touch any parts of the circuitry on the digital programmer circuit, since static electric discharge may damage this control panel. Always touch ground while working on this panel to discharge any static charge in your body.
7. 120V AC is present on the digital programmer circuit (Terminals of power relay’s and primary circuit of Digital Programmer Circuit). When troubleshooting, be cautious of possible electrical shock hazard.
Before troubleshooting, operate the microwave oven following the correct operating procedures in the instruction manual in order to find the exact cause of any trouble, since operator error may be mistaken for the oven’s malfunction.
8.1. (Troubleshooting) Oven stops operation during cooking
SYMPTOM CAUSE CORRECTIONS
1. Oven stops in 3 seconds after
pressing [Start] pad
Oven stops in 37 seconds after pressing [Start] pad
Oven stops in 10 seconds after pressing [Start] pad (Auto sensor cooking)
2. No display and no operation at all.
Fuse is blown.
No 120V AC is supplied to H.V.Inverter (U) CN702 terminals
H.V.Inverter (U) operates by the control signals from DPC but magnetron is not oscillating
Steam sensor circuit is not functioning 1. Steam sensor
Most probably loose connection of connectors, or door latch mechanism is not adjusted properly
1. Latch Switch
2. Power relay RY1
3. Loose lead wire connector CN701, CN702
4. H.V. Inverter (U)
1. Magnetron
2. Loose lead wire connector CN703
3. H.V. Inverter (U)
2. DPC
3. Open or loose wiring of sensor terminal from connector CN2 on DPC
1. Allign door, Door Latch Switches
2. Loose wiring connectors
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8.2. (Troubleshooting) Other problems
SYMPTOM CAUSE CORRECTIONS
1. Oven is dead. 1. Open or loose lead wire harness Fuse is OK. 2. Open thermal cutout / thermistor Check thermal cutout is defective. No display and no operation at all. 3. Open low voltage transformer
4. Defective DPC
2. No display and no operation at all. Fuse is blown.
3. Oven does not accept key input (Program)
4. Fan motor turns on when oven is plugged in with door closed.
5. Timer starts count down but no microwave oscillation. (No heat while oven lamp and fan motor turn on)
6. Oven can program but timer does not start countdown.
7. Microwave output is low. Oven takes longer time to cook food.
8. Fan motor turns on and turntable motor rotates when door is opened.
9. Oven does not operate and return to plugged in mode as soon as [Start] pad is pressed.
10. Loud buzzing noise can be heard. 1. Loose fan and fan motor
11. Turntable motor does not rotate. 1. Open or loose wiring of turntable motor
12. Oven stops operation during cooking. 1. Open or loose wiring of primary and
1. Shorted lead wire harness Check adjustment of primary, secondary latch
2. Defective primary latch switch (NOTE 1)
3. Defective monitor interlock switch (NOTE 1)
4. Defective Inverter Power Supply (U) NOTE 1:
All of these switches must be replaced at the same time. Check continuity of power relay RY1 contacts (between 1 and 2) and if it has continuity, replace power relay RY1 also.
1. Key input is not in proper sequence Refer to operation procedure.
2. Open or loose connection of membrane key pad to DPC (Flat cable)
3. Shorted or open membrane key board
4. Defective DPC Refer to DPC troubleshooting.
1. Misadjustment or loose wiring of secondary latch switch
2. Defective secondary latch switch
3. Door switch CN3
1. Off-alignment of primary latch switch Adjust door and latch switches.
2. Open or loose connection of high voltage circuit especially magnetron filament circuit NOTE: Large contact resistance will cause lower magnetron filament voltage and cause magnetron to have lower output and/or be intermittent.
3. Defective high voltage component H.V. Inverter Power Supply (U) Magnetron
4. Open or loose wiring of power relay RY1
5. Defective primary latch switch
6. Defective DPC or power relay RY1 Refer to DPC troubleshooting
1. Open or loose wiring of secondary latch switch
2. Off-alignment of secondary latch switch
3. Defective secondary latch switch
1. Decrease in power source voltage Consult electrician
2. Open or loose wiring of magnetron filament circuit.(Intermittent oscillation)
3. Aging change of magnetron
1. Low voltage transformer on DPC.
1. Defective DPC Check grounding connector on escutcheon
2. Defective turntable motor
secondary latch switch
2. Operation of thermal cutout
switch and monitor interlock switch including door.
Adjust door and latch switches.
Check high voltage component according to component test procedure and replace if it is defective.
base.
Adjust door and latch switches.
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8.3. Troubleshooting of inverter circuit (U) and magnetron
This oven is programmed with a self diagnostics failure code system which will help for troubleshooting. H95, H97, H98 and H99 are the provided failure codes to indicate magnetron and inverter circuit problem areas. This section explains failure codes of H95, H97, H98 and H99. First, you must program the DPC into TEST MODE, press Timer/Clock press Power Level [Start] pad is pressed and there is no microwave oscillation.
pad once. Program unit for operation. H95, H97, H98, H99 appears in display window a short time after
pad twice Press Start pad once
Alternate way to troubleshoot oven with AC Ampere meter used
H95, H97, H98, H99 appears in display window a short time after [Start] pad is pressed and no microwave oscillation with AC Ampere meter used for troubleshooting.
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8.4. SIMPLE WAY OF H.V. INVERTER/MAGNETRON TROUBLESHOOTING
Purpose:
Simple way (3/37 seconds rule) of identifying whether it’s Magnetron, Inverter or others.
Set-up:
The unit under question is connected through the Ammeter as shown below.
Procedure:
Follow the matrix table below to identify the problem source.
Note:
Do not replace both Inverter board and Magnetron simultaneously and automatically without going through this procedure.
Power will: Ammeter reading is: To do: Remedy:
Shut off in 37 seconds after “Start”.
1. Between 0.5A and 1.0A. Check and repair open magnetron circuit Open magnetron wiring between Inverter and magnetron terminal.
2. Between 1.0A and 2.0A. Check continuity of D702 in Inverter PCB.
1. D702 shorted Replace H.V.Inverter(F606Y8M00AP)
2. D702 is OK Replace magnetron
Shut off in 3 seconds after “Start”
1. Less than 0.5A Check open circuit: Latch Switch, DPC,
Power Relay and CN701
Replace defective component(s), or correct switch, cables and connectors.
8.5. H.V.INVERTER BOARD MAIN PARTS LIST (F606Y8M00AP)
Ref. No. Part No. Part Name & Description Pcs/Set Remarks DB701 B0FBBS000001 BRIDGE DIODE 1 20A, 600V L701 F50206G00AP CHOKE COIL 1 Q701 B1JAGV000015 TRANSISTOR SI 1 1000V T701 A609A8M00AP H.V. TRANSFORMER 1 (INCLUDING D701,D702,C706,C707) C701 ECWF5284N300 CAPACITOR 1 0.28µF/500V C702 ECWF2455N644 CAPACITOR 1 4.5µF/250V
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8.6. How to check the semiconductors using an OHM meter
NN-SD698S / NN-ST678S / NN-ST658W
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9 EXPLODED VIEW AND PARTS LIST
9.1. EXPLODED VIEW
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9.2. PARTS LIST
NOTE:
1. When ordering replacement part(s), please use part number(s) shown in this part list. Do not use description of the part.
2. Important safety notice: Components identified by When replacing any of these components, use only manufacture’s specified parts.
Ref. No. Part No. Part Name & Description Pcs/Set Remarks
1 F00069660AP CAUTION LABEL 1 2 F00078X00SRP NAME PLATE 1 SD698S RPH 2 F00078X00SRU NAME PLATE 1 SD698S RUH 2 F00078V60SRP NAME PLATE 1 ST678S RPH 2 F00078V60SRU NAME PLATE 1 ST678S RUH 2 F00078V70HRP NAME PLATE 1 ST658W RPH 2 F00078V70HRU NAME PLATE 1 ST658W RUH 3 F00338F00RP FUSE LABEL 1 4 F10016K10APG BASE 1 5 F10084T00AP RUBBER FOOT 4
6 F110D5Y00SAP CABINET BODY(U) 1 SD698S 6 F110D5Y30SAP CABINET BODY(U) 1 ST678S 6 F110D5Y30HAP CABINET BODY(U) 1 ST658W 7 F200A8F00AP OVEN(U) 1 SD698S 7 F200A8F40AP OVEN(U) 1 ST678S,ST658W 8 F20555L00AP COVER 1 9 F21315Y00AP PULLY SHAFT 1
10 F2177-F80 WASHER 1
mark have special characteristics important for safety.
NN-SD698S / NN-ST678S / NN-ST658W
11 F290D9330AP ROLLER RING(U) 1 12 F30206G30AP DOOR HOOK 1 SD698S,ST678S 12 F30206K50AP DOOR HOOK 1 ST658W 13 F3097-5L00 LATCH SPRING 1 ST658W 14 F31366G30AP HOOK LEVER A 1 SD698S,ST678S 14 F31366K50AP HOOK LEVER A 1 ST658W 15 F31376G30AP HOOK LEVER B 1 SD698S,ST678S 15 F31376K50AP HOOK LEVER B 1 ST658W
16 F31386G30AP HOOK LEVER C 1 SD698S,ST678S 16 F31386K50AP HOOK LEVER C 1 ST658W 17 F400A5Y00AP FAN MOTOR 1 AC120V,SINGLE PHASE,60Hz 18 F40084T00AP FAN BLADE 1 19 F40257D00APG AIR GUIDE A 1 20 F41445Y00AP ORIFICE 1
21 J607S4T00AP STEAM SENSOR 1 SD698S 22 F64508660AP SENSOR COVER B 1 SD698S 24 F65434W00AP SENSOR COVER C 1 SD698S 25 F612E5U40AP INCANDESCENT LAMP (U) 1
26 J61415G10XN MICRO SWITCH 1 (PRIMARY LATCH SWITCH) (V-15G-3C25) 27 J61414T00AP MICRO SWITCH 1 (SECONDARY LATCH SWITCH) (D3V-16G-3C25) 28 F61456N60AP THERMAL CUTOUT 1 30 F61785U30XN MICRO SWITCH 1 (MONITOR INTERLOCK SWITCH) (D3V-1G-2C25)
31 F606Y8M00AP H.V.INVERTER (U) 1 32 2M261-M32KLP MAGNETRON 1 33 F62308F20AP FUSE 1 35 F66626K50AP GROUNDING PLATE 1
36 F63265G60AP TURNTABLE MOTOR 1 37 F900C4T00AP AC CORD W/PLUG 1 38 F62315G10XN FUSE HOLDER 1 39 XTWFL4+12T SCREW 4 FOR MAGNETRON 40 XTTFL4+6BN SCREW 1 FOR COVER
42 XTCAFA4+12AFM SCREW 1 FOR CABINET BODY SIDE (SD698S) 42 XTCAFA4+12AFS SCREW 1 FOR CABINET BODY SIDE (ST678S) 42 XTCAFA4+12AFW SCREW 1 FOR CABINET BODY SIDE (ST658W) 43 XTTBFE4T12A0 SCREW 4 FOR CABINET BODY
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Ref. No. Part No. Part Name & Description Pcs/Set Remarks
45 F65856K50AP INVERTER BRACKET 1
46 F03347D00RP MENU LABEL 1 SD698S 46 F03347G50RP MENU LABEL 1 ST678S,ST658W
48 F40264T60APG AIR GUIDE B 1 52 F00066G00RP CAUTION LABEL 1 SD698S RPH,ST678S RPH
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9.3. WIRING MATERIALS
NN-SD698S / NN-ST678S / NN-ST658W
Ref. No. Part No. Part Name & Description Pcs/Set Remarks
W1 F030A7D00RP LEAD WIRE HARNESS 1 W2 F030E5L00AP H.V.LEAD WIRE 1 W3 F03537D00AP LEAD WIRE HARNESS U 1 (INCLUDING THERMISTOR)
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9.4. DOOR ASSEMBLY
Ref. No. Part No. Part Name & Description Pcs/Set Remarks
D1 F30186P40AG DOOR KEY A 1 SD698S,ST678S D1 F30184Y30XN DOOR KEY A 1 ST658W D2 F301A8X00SCP DOOR A (U) 1 SD698S D2 F301A8M00SAP DOOR A (U) 1 ST678S D3 F302K5L00AP DOOR E (U) 1 D4 F30215G10XN DOOR KEY SPRING 1 D5 F30854T00AP DOOR C 1
D6 F31454T00AP DOOR SCREEN A 1 D7 F31468F50HCP DOOR SCREEN B 1 ST658W D8 F30016K50HAP DOOR A 1 ST658W
D10 F02459660AP DHHS LABEL 1 SD698S,ST678S
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9.5. ESCUTCHEON BASE ASSEMBLY
9.5.1. NN-SD698S
NN-SD698S / NN-ST678S / NN-ST658W
Ref. No. Part No. Part Name & Description Pcs/Set Remarks
E1 F603L8X00RP D.P.CIRCUIT (AU) 1 SD698S E2 F603Y8X00RP D.P.CIRCUIT (DU) 1 SD698S E3 F800L8X00SRP ESCUTCHEON BASE (U) 1 SD698S E4 F66164W20AP FLAT CABLE 1 SD698S E5 F82988X00SAP BUTTON 1 SD698S E6 F80725Y00SAP DOOR OPENING BUTTON (U) 1 SD698S E7 F82566K10AP DOOR OPENING LEVER 1 SD698S
E8 F80375K00AP COOK BUTTON SPRING 1 SD699S E10 F90095X00AP GROUNDING PANEL 1 SD698S E11 F83928P00KAP DIAL 1 SD698S
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9.5.2. NN-ST678S
Ref. No. Part No. Part Name & Description Pcs/Set Remarks
E21 F603L8V60RP D.P.CIRCUIT (AU) 1 ST678S E23 F800L8V60SRP ESCUTCHEON BASE (U) 1 ST678S E26 F80725Y00SAP DOOR OPENING BUTTON (U) 1 ST678S E27 F82565Y00AP DOOR OPENING LEVER 1 ST678S E28 F80375K00AP COOK BUTTON SPRING 1 ST678S E29 F630Y8V60BRP MEMBRANE SWITCH (U) 1 ST678S E30 F90095X00AP GROUNDING PANEL 1 ST678S
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9.5.3. NN-ST658W
NN-SD698S / NN-ST678S / NN-ST658W
Ref. No. Part No. Part Name & Description Pcs/Set Remarks
E41 F603L7G50RP D.P.CIRCUIT (AU) 1 ST658W E43 F80346K50HAP ESCUTCHEON BASE 1 ST658W E49 F630Y8V70HRP MEMBRANE SWITCH (U) 1 ST658W E50 L5AAAEC00056 DISPLAY 1 ST658W E51 F66175L00AP DISPLAY TUBE COVER 1 ST658W E52 F67005U40XN RUBBER CONNECTOR 1 ST658W
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9.6. PACKING AND ACCESSORIES
Ref. No. Part No. Part Name & Description Pcs/Set Remarks
P1 F00038X00RP INSTRUCTION MANUAL 1 SD698S P1 F00038V60RP INSTRUCTION MANUAL 1 ST678S,ST658W P2 F01028X00SRP PACKING CASE,PAPER 1 SD698S RPH P2 F01028V60SRP PACKING CASE,PAPER 1 ST678S RPH P2 F01028V70HRP PACKING CASE,PAPER 1 ST658W RPH P3 F01046K50AP UPPER FILLER 1 P4 F01055L00AP LOWER FILLER 1 P5 F01067F00AP P.E.BAG 1 SD698S,ST678S P5 F01068100XN P.E.BAG 1 ST658W
P6 F01078J00XN DOOR SHEET 1 P8 F06014T00AP COOKING TRAY 1 P9 F01924T00AP SHEET 1
P10 F00065G40AP CAUTION LABEL 1
P12 F00166H70RP NOTICE 1 SD698S,ST678S
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10 DIGITAL PROGRAMMER CIRCUIT
10.1. NN-SD698S
NN-SD698S / NN-ST678S / NN-ST658W
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NN-SD698S / NN-ST678S / NN-ST658W
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10.2. NN-ST678S
NN-SD698S / NN-ST678S / NN-ST658W
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NN-SD698S / NN-ST678S / NN-ST658W
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10.3. NN-ST658W
NN-SD698S / NN-ST678S / NN-ST658W
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NN-SD698S / NN-ST678S / NN-ST658W
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10.4. PARTS LIST
10.4.1. NN-SD698S
NN-SD698S / NN-ST678S / NN-ST658W
BZ310 L0DDEA000014 BUZZER 1 2.0KHz C10 AECETK1V471B AL CHEM CAPACITOR 1 470µF/35V C13,C16 AECETS1C220B AL CHEM CAPACITOR 2 22µF/16V C482 AECETS1H010B AL CHEM CAPACITOR 1 1µF/50V C483 AECETS1HR47B AL CHEM CAPACITOR 1 0.47µF/50V C485 AECETS1H2R2B AL CHEM CAPACITOR 1 2.2µF/16V CX320 H2B800400007 CERAMIC RESONATOR 1 8.0MHz DISP110 L5AAAEC00061 LCD 1 DISP HOLDER F66177D60AP LCD HOLDER 1 D40,D220,D221,D226,D227 MA2C19600E DIODE 5 D10-D13 B0EAKT000025 DIODE 4 D480 MA2C700A0F DIODE 1 IC1 MN101C78AEG L.S.I. 1 IC350 C0EBE0000401 IC 1 IC480 C0ABBA000230 IC 1 Q10,Q180 B1BAAJ000003 TRANSISTOR 2 D25 D4EAY271A036 ZENER RESISTOR 1 270V D26,D27 D4EAY112A036 ZENER RESISTOR 2 1100V RY1 AEBGJQC25F18 POWER RELAY 1 T10 G4C2AAD00005 LOW VOLTAGE TRANSFORMER 1 120V SW1,SW2,SW6,SW7,SW8,SW9,SW10,
SW11,SW12,SW13, SW14 RE80 EVEJ1HF2224B REVOLVING ENCODER 1 ZD10 B0BA5R600016 ZENER DIODE 1 ZD11 B0BA4R400002 ZENER DIODE 1
Ref. No. Part No. Part Name & Description Pcs/Set Remarks
EVQ11L05R SWITCH 11
10.4.2. NN-ST678S
BZ210 L0DDEA000014 BUZZER 1 2.0KHz C12 AECETK1V471B AL CHEM CAPACITOR 1 470µF/35V C13,C16 AECETS1C220B AL CHEM CAPACITOR 2 22µF/16V CX320 H2B800400007 CERAMIC RESONATOR 1 8.0MHz DISP110 L5AAAEC00057 LCD 1 DISP HOLDER F66174U20AP LCD HOLDER 1 D220-D222,D224,D227 MA2C19600E DIODE 5 D10-D13 B0EAKT000025 DIODE 4 IC1 MN101C78AEH L.S.I. 1 IC350 C0EBE0000401 IC 1 Q10,Q180 B1BAAJ000003 TRANSISTOR 2 D25 D4EAY271A036 ZENER RESISTOR 1 270V D26,D27 D4EAY112A036 ZENER RESISTOR 2 1100V RY1 AEBGJQC25F18 POWER RELAY 1 T10 G4C2AAD00006 LOW VOLTAGE TRANSFORMER 1 120V VZ1 D3CA6103A017 VARISTOR 1 10K ZD10 B0BA5R600016 ZENER DIODE 1 ZD11 B0BA4R400002 ZENER DIODE 1
Ref. No. Part No. Part Name & Description Pcs/Set Remarks
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NN-SD698S / NN-ST678S / NN-ST658W
10.4.3. NN-ST658W
BZ310 L0DDEA000014 BUZZER 1 2.0KHz C12 AECETK1V471B AL CHEM CAPACITOR 1 470µF/35V C13 AECETS1C220B AL CHEM CAPACITOR 2 22µF/16V CX320 H2B800400007 CERAMIC RESONATOR 1 8.0MHz D220-D222,D224,D227 MA2C19600E DIODE 5 D10-D13 B0EAKT000025 DIODE 4 IC1 MN101C78ADD L.S.I. 1 IC350 C0EBE0000401 IC 1 Q10,Q180 B1BAAJ000003 TRANSISTOR 2 D25 D4EAY271A036 ZENER RESISTOR 1 270V D26,D27 D4EAY112A036 ZENER RESISTOR 2 1100V RY1 AEBGJQC25F18 POWER RELAY 1 T10 G4C2AAD00006 LOW VOLTAGE TRANSFORMER 1 120V VZ1 D3CA6103A017 VARISTOR 1 10K ZD10 B0BA5R600016 ZENER DIODE 1 ZD11 B0BA4R400002 ZENER DIODE 1
Ref. No. Part No. Part Name & Description Pcs/Set Remarks
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01/08 S-8X0 S-8V6 S-8V7 Printed in China
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