Panasonic NN-CT641M Service Manual Download | Manualshive

Page: 27 / 42

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5-16

No microwave
oscillation.

No continuity.

Continuity.

Defective P.C.B
assembly

Replace P.C.B
assembly

Disconnect the
wire leads from
relay 5 and
check continuity
of relay 5.
(Operate the
unit)

Abnormal

normal

Defective high
voltage
transformer.

Replace high
voltage
transformer .

Check H.V.
transformer.

normal

normal

Abnormal

Defective high
voltage Diode.

Replace high
voltage Diode.

Check H.V.
diode.

Abnormal

Defective high
voltage capacitor.

Replace high
voltage capacitor.

Check H.V.
capacitor.

Abnormal

Defective
magnetron.

Replace
magnetron .

Check
Magnetron.

(TROUBLE 5) No microwave oscillation even though oven lamp and fan motor run

(Display operates properly)

CONDITION

CHECK

RESULT

CAUSE

REMEDY

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Summary of Contents for NN-CT641M

Page 1: ... min W x H x 4 D mm W x H x 348 D mm 2M319M Panasonic Corporation 2011 Unauthorized copying and distribution is a violation of law Model No NN CT641M NN CT651M Order No MOD111034 8 India 2 1 7L 513 306 71 17 2 kg approx 9 kg approx 900 Watts full microwave power IEC60705 Single phase 3 wire grounded Grill 230 Volts AC 50 Hz 7 0 A A Microwave 1450W 14 W 00 6 0 10 4 A Convection 2400W 7 White Silver...

Page 2: ...ther damage 4 damage to or loosening of hinges and latches 5 evidence of dropping or abuse C Before turning on microwave power for any service test or inspection within the microwave generating compartments check the magnetron wave guide or transmission line and cavity for proper alignment integrity and connections D Any defective or misadjusted components in the interlock monitor door seal and mi...

Page 3: ...RAM 4 3 CIRCUIT DESCRIPTION 4 4 SERVICE INFORMATION 5 1 TOOLS AND MEASURING INSTRUMENTS 5 1 MICROWAVE LEAKAGE TEST 5 1 MEASUREMENT OF MICROWAVE POWER OUTPUT 5 3 DISASSEMBLY AND ADJUSTMENT 5 3 INTERLOCK CONTINUITY TEST 5 7 COMPONENT TEST PROCEDURE 5 8 TROUBLE SHOOTING 5 12 EXPLODED VIEW 6 1 REPLACEMENT PARTS LIST 7 1 SCHEMATIC DIAGRAM OF P C B 8 1 POWER LEVEL AND ACCESSORIES 1 1 ...

Page 4: ... for commercial purposes DESCRIPTION ITEM Control Complement Rating Label Location Accessories Microwave Power for Variable Cooking Power level Combi Combi Inside Glass Tray Ro R ller ing Wire Rack Instruction manual 440 Watts Max Defrost Medium Low Warm in 250 Watts 715 Watts 100 Watts 900 Watts high low ...

Page 5: ...gnetron be assembled to the waveguide and cavity Never operate the magnetron unless it is properly installed Be sure that the magnetron gasket is properly installed around the dome of the tube whenever installing the magnetron CAUTIONS Unlike other appliances the microwave oven is high voltage and high current equipment Though it is free from danger in ordinary use extreme care should be taken dur...

Page 6: ...lat surface at least 10 cm 4 inches from the wall 7 Place the microwave oven as far away as possible from TV RADIO COMPUTER etc to prevent interference EARTHING INSTRUCTIONS This microwave oven is designed to be used in a fully earthed condition It is imperative therefore to make sure it is properly earthed before servicing WARNING THIS APPLIANCE MUST BE EARTHED IMPORTANT As the colors of the wire...

Page 7: ...fore Cooking One press clears your instructions During Cooking One press temporarily stops the cooking program and the time of day will appear in the display 20 Start Pad 8 Clock Pad 10 Auto Programs Main Dish 19 Stop Reset Pad 11 Auto Programs Side Dish Gravy 12 Auto Programs Side Dish Dry 13 Auto Programs Soup Snack 14 Auto Programs Tandoori Grill 15 Auto Programs Japanese 16 Auto Programs Desse...

Page 8: ...ME START TIME START Stop Clock Set the time by pressing time pads Clock Desired defrost Desired Start program weight OPERATING SEQUENCE Using this system will make the oven inoperable however the door can be opened Child Lock can be set when the display shows a colon or the time Press Start Pad three times in 10 seconds To Cancel Press Stop Pad three times in 10 second TO Set Reset top Stop Reset ...

Page 9: ...4 3 SCHEMATIC DIAGRAM 15A Ry 1 Ry 2 Ry 3 Ry 4 Ry 5 RY3 RY4 RY5 RY1 RY2 ...

Page 10: ...DC is applied to the filament of the magnetron WHEN THE OVEN IS SET AT ANY LEVEL EXCEPT MAXIMUM The micom controller controls the ON OFF time of relay power of microwave oven as POWER LEVEL refer to page 1 1 WHEN THE DOOR IS OPENED DURING COOKING Both the primary switch and relay 5 are cut off primary winding voltage of the high voltage transformer ON OFF of relay 5 is coupled electrically with op...

Page 11: ...er and convection Turntable rotates The fan motor and convection fan motor rotates The air is also directed into the oven to exhaust the vapor in the oven through the back plate and upper plate 5 4 CONVECTION FUNCTION L N GRILL THERMOSTAT GRILL HEATER L G Y N E RELAY THERMOSTAT CONVECTION CONVECTION HEATER by the solid line heater through each thermostat as shown 4 RELAY 3 ...

Page 12: ...er which is graduated to 600 cc and place the beaker on the center of the turntable Set the energy leakage monitor to 2450 MHz and use it following the manufacturer s recommended test procedure to assure correct result When measuring the leakage always use the 2 inch 5cm spacer supplied with the probe Operate the oven at its maximum output Measure the microwave radiation using and electromagnetic ...

Page 13: ...e test probe must be removed no faster than 1 inch sec 2 5 cm sec along the shaded area otherwise a false reading may result The test probe must be held with the grip portion of the handle A false reading may result if the operator s hand is between the handle and the probe When testing near a corner of the door keep the probe perpendicular to the surface making sure the probe horizontally along t...

Page 14: ...d to the vessel After addition of the water to the vessel the load is immediately placed on the center of the turntable which is in thd lowest position and the microwave power switched on The time T for the temperature of the water to rise by a value T of 10 2 K is measured where T is the time in seconds and T is the temperature rise The initial and final water temperatures are selected so that th...

Page 15: ...gh voltage capacitor 2 Disconnect the leadwire from magnetron high voltage transformer and capacitor 3 Remove the screw holding the high voltage transformer to the baseplate F 1 Discharge the high voltage capacitor 2 Disconnect the leadwire from fan motor noise filter and high voltage capacitor 3 Remove the two screws holding the orifice oven cavity and remove the high voltage earth screw 4 Remove...

Page 16: ...le motor terminals 6 Remove the screw securing the turntable motor to the oven cavity ASS Y 7 After rep the motor rotate the removed turntable motor cover 8 Fit the turntable motor cover s projecting part to the base plate slit NOTE 1 Remove the wire lead from the turntable motor VERY CAREFULLY Waveguide Magnetron Gasket Magnetron Dome Waveguide Bracket Magnetron damaged magnetron 2 When replacing...

Page 17: ...USTMENT OF THE LATCH BOARD TO THE OVEN ASSEMBLY Mount the latch board to the oven assembly Adjust the latch board in the arrow direction so that oven door will not have any play in it when the door is closed Tighten the mounting screw Check for play in the door by pushing the door release button Door movement should be less than 0 5 mm 1 64 inch Don t push the door release button while making adju...

Page 18: ...n circuit in the door open condition When the door is closed meter should indicate an closed circuit When the secondary switch operation is abnormal make the necessary adjustment or replace the switch only with the same type of switch C MONITOR SWITCH TEST Disconnect the wire lead from the monitor switch Connect the ohmmeter leads to the common COM and normally closed NC terminals of the switch Th...

Page 19: ...EDURE RESULTS HIGH VOLTAGE TRANSFORMER Wire leads removed MAGNETRON Wire leads removed 1 Measure the resistance Ohm meter scale Rx1 Primary winding Secondary winding Filament winding 2 Measure the resistance Ohm meter scale Rx1000 Primary winding to ground Filament winding to ground 1 Measure the resistance Ohm meter scale Rx1 Filament terminal 2 Measure the resistance Ohm meter scale Rx1000 Filam...

Page 20: ...r scale Rx1000 Terminal to case Measure the continuity Forward Ohm meter scale Rx10000 Measure the continuity Reverse Ohm meter scale Rx10000 Normal Momentarily indicates several ohms and then gradually returns to Normal Normal Continuity Abnormal Normal Abnormal Continuity NOTE When testing the magnetron be sure to install the magnetron gasket in the correct position and be sure that the gasket i...

Page 21: ...ime Replace just the fuse if the switches operate normally Normal Abnormal HEATER ELEMENT Wire leads removed Measure the resistance Multi meter scale Rx1 Measure the resistance with 500V 100M ohm insulation resistance meter NOTE Make sure heater is fully cooled when tested THERMOSTAT Normal more than 0 5 Mohm temperature specified temperature Above COMPONENTS TEST PROCEDURE RESULTS Below specified...

Page 22: ...CTOR NOT THE WIRES 1 3 5 Measure the resistance Ohm meter scale R x 1 Normal Abnormal or several Ω 00 500 1 Cooking Start OFF Ω Normal Approx 100 200K Abnormal or several Ω Ω L V Transformer of P C B Refer to schemetic diagram Check for P C B connector Disconnect the 3 pin connector from P C B Normal Abnormal COMPONENTS TEST PROCEDURE RESULTS Relay 2 Relay 1 Relay 3 Relay 4 Relay 5 RELAY 2 RELAY 3...

Page 23: ...nto one plug outlet and using them at the same time causes overloading Microwave oven plug is not inserted tightly Output power is too low Low AC input voltage Food temperature is too low Using metallic ware and allowing it to touch the oven wall Sparks occurring Inconsistent intensity of microwave by their characteristics 1 Wrap the thinner part with aluminum foil 2 Use plastic wrap or lid 3 Stir...

Page 24: ... Digit flickering NOTE Slight flickering is normal 2 Colon does not turn on or blink 3 A distinct change in the brightness of one or more numbers in display 4 One or more digits in the display are not lighting 5 Display indicates a number different from one touched for example key in 5 and 3 appears in the display 6 Specific numbers for example 7 or 9 will not display when key pad is touched 7 Dis...

Page 25: ...onnect one side of the wire lead connected from transformer to the high voltage capacitor and operate the unit No continuity Continuity Shorted contact at the primary switch Fuse blows again Normal Defective high voltage capacitor Replace high voltage capacitor Defective high volt age transformer Replace high volt age transformer Replace fuse TROUBLE 2 Oven does not operate at all Display window d...

Page 26: ...k continuity of secondary switch with door closed Check fan motor Check oven lamp Abnormal Abnormal Normal Defective fan motor Defective oven lamp Replace fan motor Replace oven lamp Loose connection Connection then tightly CONDITION CHECK RESULT CAUSE REMEDY Output is low Lower than 90 of rating voltage Normal Normal Abnormal Abnormal Measure the output power Disconnect the wire leads from relay ...

Page 27: ... Replace high voltage transformer Check H V transformer normal normal Abnormal Defective high voltage Diode Replace high voltage Diode Check H V diode Abnormal Defective high voltage capacitor Replace high voltage capacitor Check H V capacitor Abnormal Defective magnetron Replace magnetron Check Magnetron TROUBLE 5 No microwave oscillation even though oven lamp and fan motor run Display operates p...

Page 28: ...nction the thermostat Replace Thermostat and relay 4 Grill Normal 1 Lower tempera ture the oven Abnormal Malfunction the heater Replace Heater Normal Abnormal Malfunction the thermostat Replace Thermostat and relay 4 Grill No continuity Open or loosen Replace or connect tightly Wire connection TROUBLE 6 Oven does not cook properly when programmed for the set power level Operates properly on HIGH T...

Page 29: ...nd relay3 No continuity Open or loosen Replace or connect tightly Wire connection NOTE Make sure the wore leads correct position When removing the wire leads from parts be sure to grasp the connector not the wires When removing the magnetron be sure to install the magnetron gasket in the correct position and in good condition TROUBLE 8 Convection CONDITION CHECK RESULT CAUSE REMEDY is not Heater C...

Page 30: ...OVEN CAVITY PARTS INTERIOR PARTS BASE PLATE PARTS LATCH BOARD PARTS CONTROL PANEL PARTS DOOR PARTS 6 1 EXPLODED VIEW INTRODUCTION ...

Page 31: ...6 2 DOOR PARTS 1 2 3 5 6 7 8 9 4 ...

Page 32: ...6 3 CONTROL PANEL PARTS 10 11 12 13 ...

Page 33: ...INTERIOR PARTS 6 4 18 19 20 21 22 23 24 25 26 31 32 33 28 30 71 72 65 64 29 27 ...

Page 34: ...6 5 36 LATCH BOARD PARTS 41 34 35 42 37 37 38 39 ...

Page 35: ...6 6 OVEN CAVITY PARTS 44 45 46 47 48 49 50 51 52 R00 43 ...

Page 36: ...6 7 BASE PLATE PARTS 53 54 55 56 57 59 60 61 ...

Page 37: ...301841G0TU DOOR KEY 1 8 A323041G0TU SPRING 1 9 A300R41H0BTU 10 A630Y41H0BTU MEMBRANE SWITCH U 1 11 A803441H0TU ESCUTCHEON BASE 1 12 A812741G0TU ESCUTCHEON BACK PLATE 1 13 A603L41H0TU PC BOARD U 1 18 A400841H0TU 19 A414441G0TU ORIFICE 1 20 A400A41G0TU COOLING FAN MOTOR 1 18 19 20 A40A141G0TU FAN MOTOR ASSY 1 21 A692Y41G0TU NOISE FILTER 1 22 A623041G0TU FUSE 1 15A 23 A488540N0BP BRACKET WATER SEALIN...

Page 38: ...MOTOR 1 49 A400B41G0TU CONVECTION HEATER 1 50 A641741G0TU HEATER PANEL 1 51 A61457W50BP THERMAL CUTOUT CONVECTION 1 52 A667941G0TU BACK COVER 1 53 A30077W50BP LOWER HINGE 1 54 A100141G0TU BASE 1 55 A600B41G0TU H V TRANSFORMER 1 56 A609041G0TU H V CAPACITOR 1 57 A62027W50BP DIODE SI 1 59 A61887W50BP BRACKET H V CAPACITOR 1 61 A100841G0TU RUBBER FOOT 4 64 A060241H0TU WIRE RACK LOW 1 65 A060241G0TU W...

Page 39: ...01841G0TU DOOR KEY 1 8 A323041G0TU SPRING 1 10 A630Y41H0MTU MEMBRANE SWITCH U 1 11 A803441H0TU ESCUTCHEON BASE 1 12 A812741G0TU ESCUTCHEON BACK PLATE 1 13 A603L41H0TU PC BOARD U 1 18 A400841H0TU 19 A414441G0TU ORIFICE 1 20 A400A41G0TU COOLING FAN MOTOR 1 18 19 20 A40A141G0TU FAN MOTOR ASSY 1 21 A692Y41G0TU NOISE FILTER 1 22 A623041G0TU FUSE 1 15A 23 A488540N0BP BRACKET WATER SEALING 1 24 A205541G0...

Page 40: ...ONVECTION MOTOR 1 49 A400B41G0TU CONVECTION HEATER 1 50 A641741G0TU HEATER PANEL 1 51 A61457W50BP THERMAL CUTOUT CONVECTION 1 52 A667941G0TU BACK COVER 1 53 A30077W50BP LOWER HINGE 1 54 A100141G0TU BASE 1 55 A600B41G0TU H V TRANSFORMER 1 56 A609041G0TU H V CAPACITOR 1 57 A62027W50BP DIODE SI 1 59 A61887W50BP BRACKET H V CAPACITOR 1 61 A100841G0TU RUBBER FOOT 4 64 A060241H0TU WIRE RACK LOW 1 65 A06...

Page 41: ...A SWB SWC SWD R62 2K SWA R37 20K R36 20K R35 20K R34 20K 5V R45 1K R46 1K R30 1K R31 1K KS0 KS1 KS2 KS3 R10 1K R11 20K R33 1K R12 20K r32 1K R13 20K R7 1K R14 20K 5V JR3 2K P1 7 R44 1K R43 1K RX 22R 2W D100 1N4007 D101 1N4007 D103 1N4007 D104 1N4007 E100 4 7uF 400V E101 4 7uF 400V L101 2 2mH 0 1A R107 3K9 C100 102 1KV R102 100K R101 100R D102 1N4007 S 1 BP 3 FB 4 D 5 S 7 S 8 S 2 IC100 LNK364 C102 ...

Page 42: ...P NO Printed in China 11 April 20 ...

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