Panasonic NN-CT577SEPG Service Manual Download Page 15 | Manualshive

Page: 15 / 21

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16

figure 17 Inverter circuit board layout

10.6 Inverter power supply unit

Warning

Do not attempt to make any measurements in the high
voltage circuit of the inverter or magnetron.

See troubleshooting of the inverter circuit and magne-
tron on <$elemtextto determine if the inverter power
supply is still functioning.

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Summary of Contents for NN-CT577SEPG

Page 1: ... 1380W Micro Grill Combi 2390W Micro Conv Combi 2400 Output IEC60705 Microwave 1000W Grill1300W Convection 1300W Microwave frequency 2450Mhz Timer 99 min 99 second Oven cavity size 27L Outside dimensions 510mm W x 390mm D X 305MM H Inside dimensions 359mm W X 352mm D x 217mm H Weight 13Kg Specifications subject to change without notice ...

Page 2: ...n warnings or cautions to advise non technical individuals of potential dangers in attempting to service a product Products powered by electricity must be serviced or repaired only by expe rienced proffesional technicians Any attempt to service or repair the product or products dealt with this service information by anyone else could result in serious injury or death There are special components u...

Page 3: ...heat Sensor Cook Sensor Combi Weight Defrost 3 Weight Combination 2 Weight Reheat Weight Cook 1 Auto Preheat 1 Weight Crisp 4 Stage Cooking 1 stage Delay Stand Yes More Less No Kg lb oz No Clock 24 h Word prompt None Italian Spanish Dutch French German Greek Portu guese Polish English ...

Page 4: ...4 3 Control Panel ...

Page 5: ...the board care must be taken to avoid possible electric shock Do not touch the aluminium heat sink as it is part of the high voltage circuit and becomes very hot Do not attempt to repair the inverter PCB this can be very dangerous Replace the high volt age inverter circuit as a complete unit Do not adjust or tamper with the pre set volume on the inverter board It is very dangerous to adjust this p...

Page 6: ...HE COLOUR O THE CONNECTOR HOUSIN MA NETRON HI H OL TA E IN ER TER CAUTION HEAT SINK HOT LI E ER Y HI H OL TA E AND TEMPERATURE BR BR BR OR 1 C2 PRIMARY LATCH SWITCH TOP WH WH WH SECONDARY LATCH SWITCH OUTSIDE BOTTOM BR N YE YE SHORT SWITCH INSIDE BOTTOM YE BL POWER RELAY RY1 N 2 1 BL SYMBOL COLOUR BL BLUE BK BLACK BR BROWN WH WHITE YE YELLOW N NATURAL R RED R ...

Page 7: ...e care should be taken during repair Caution Servicemen should remove their watches whenever working close to or replacing the magnetron 8 1 Check the grounding Do not operate the microwave oven on a two wire extension cord The microwave oven is designed to be used only when grounded It is imperative that the appliance is properly grounded before beginning repair work 8 2 Inverter Warnings DANGER ...

Page 8: ...s extreme DANGER Ensure that the inverter circuit is properly grounded via the inverter earth bracket figure 5 Grounding of the inverter circuit board WARNING DISCHARGE THE HIGH VOLTAGE CAPACI TORS For about 30 seconds after the oven is turned off an electric charge remains in the high voltage capacitors on the inverter circuit board figure 6 Discharging the high voltage capacitors 1 Before replac...

Page 9: ...ld the switches 8 5 Oven cavity aperatures Never insert a wire or any other metal object through the lamp holes or other aperatures in the oven cavity because such objects may work as an antenna and cause microwave leakage 8 6 Confirm after repair 1 After repair or replacement of parts make sure that the screws of the oven are neither loose nor miss ing Microwaves might leak if screws are not prop...

Page 10: ... 2 Inverter circuit 1 Discharge the high voltage capacitors 2 Remove 2 screws holding the tie bar 3 Unplug the H V Lead wires from the magnetron 4 Remove the 1 screw holding the earth wire to the magnetron 5 Remove the connector CN701 and CN702 from the inverter PCB figure 9 6 Remove the 2 screws holding the inverter support base to the oven chassis 7 Carefully remove the inverter circuit board an...

Page 11: ...12 1 2 Replacing the inverter 3 4 ...

Page 12: ...ote Ground your body to discharge static charges before handling the DPC 1 Carefully remove all solder from the terminal pins of the low voltage transformer power relays using a 30W soldering iron and a solder sucker 2 With all of the terminal pins cleaned and separated from the DPC contacts remove the defective trans former power relays and install the new compo nents making sure that the termina...

Page 13: ...le Motor 1 Remove the motor cover by breaking it off at the 8 spots indicated by the arrows 2 Disconnect the two lead wires connected to the turntable motor 3 Remove the 2 screws holding the turntable motor Note After breaking off the motor cover make sure no sharp edges are exposed by trimming off the edges or bending them inside Note To secure the motor cover use a 4 x 6 screw figure 14 Removing...

Page 14: ...r to these leads 3 Test the continuity of the short switch with the door open and the door closed using a ohm meter set to the lowest resistance scale 10 3 Magnetron Continuity checks can only indicate an open filament or a shorted magnetron To diagnose an open filament or shorted magnetron 1 Disconnect the high voltage lead wires from the magnetron input terminals 2 Check the continuity across th...

Page 15: ...r power supply unit Warning Do not attempt to make any measurements in the high voltage circuit of the inverter or magnetron See troubleshooting of the inverter circuit and magne tron on elemtextto determine if the inverter power supply is still functioning ...

Page 16: ...ed Completely tighten the screws holding the door hook assembly to the oven assembly 4 Reconnect the short switch primary switch and sec ondary latch switches and check the continuity of the monitor circuit and latch switches by following the component test procedures on elemtext 11 2 Measurement of microwave output The output power of the magnetron can be determined by performing the IEC standard...

Page 17: ...ls of the power relays and the primary circuit of the low voltage transformer When troubleshooting be cautious of possible electric shock To ensure the complaint is not due to operator error check the operation of the oven by following the procedures explained in the operating instruction book Self diagnostic display The oven has self diagnostic function which can be activated as follows To show s...

Page 18: ...ure 4 Oven does not operate return to plugged in mode as soon as Start Pad is pressed 1 Defective DPC Check grounding connector on esctcheon base 5 No display and no operation at all Fuse is Blown 1 Shorted lead wire harness 2 Defective primary latch switch NOTE 1 3 Defective short switch NOTE 1 4 Defective Inverter power supply Refer to inverter circuit test pro cedure page Check adjustment of th...

Page 19: ...output is low Oven takes a long time to cook food 1 Decrease in power source volt age 2 Open or loose wiring of magne tron filament circuit causing inter mittent oscillation 3 Ageing of magnetron Consult electrician Refer to output test procedures Change magnetron 2 Loud Buzzing noise can be heard 1 Loose fan or fan motor 3 Turntable motor does not rotate Open or loose wiring of turntable motor 2 ...

Page 20: ...is dead 1 Fuse pattern on DPC Normal STEP 2 Open Note1 Shorted circuit ZNR LVT Lamp 2 IC10 pin 9 12V line Abnormal 0V IC10 Normal 12V Step 3 3 IC 1 pin 73 Emitter of Q10 Abnormal ZB10 Q10 Ribbon cable Normal 5V Step 4 4 IC 1 pin 27 pin 15 of IC220 Abnormal IC 220 Normal IC1 CX1 NOTE The procedure for repairing the fuse pattern on the DPC is as follows 1 Fuse pattern PF2 open circuit a Remove the j...

Page 21: ...mal Display Microwave oven shuts down between 15 33 seconds Set the microwave oven to test mode Set to high power 1 minute H97 or H98 appears in the dis play and the microwave oven stops working Program for 1 minute and per form the following test 1 Unplug CN702 connec tor and measure the voltage between the terminlas Abnormal 1 Latch switch 2 DPC Power relay Normal Step 2 2 Unplug CN703 connec to...

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