Panasonic NN-SA768W Service Manual Download Page 1

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© 2008 Panasonic Home Appliances Microwave
Oven (Shanghai) Co., Ltd. All rights reserved.
Unauthorized copying and distribution is a violation
of law.

NN-SD798S
NN-ST778S
NN-SA768W

RPH (LATIN AMERICA)
RUH (MEXICO)

Microwave Oven

ORDER NO.PHAMOS0801004C3

Summary of Contents for NN-SA768W

Page 1: ...Appliances Microwave Oven Shanghai Co Ltd All rights reserved Unauthorized copying and distribution is a violation of law NN SD798S NN ST778S NN SA768W RPH LATIN AMERICA RUH MEXICO Microwave Oven ORDER NO PHAMOS0801004C3 E1 ...

Page 2: ...2 NN SD798S NN ST778S NN SA768W ...

Page 3: ...3 NN SD798S NN ST778S NN SA768W ...

Page 4: ...Interlock Switch 14 5 3 Magnetron 14 5 4 key board membrane Membrane switch assembly 14 5 5 Inverter power supply U 15 5 6 Temperature thermistor 15 6 MEASUREMENTS AND ADJUSTMENTS 16 6 1 Adjustment of primary latch switch secondary latch switch and monitor interlock switch 16 6 2 Measurement of microwave output 16 7 PROCEDURE FOR MEASURING MICROWAVE ENERGY LEAKAGE 17 7 1 Equipment 17 7 2 Procedure...

Page 5: ...1 SCHEMATIC DIAGRAM 5 NN SD798S NN ST778S NN SA768W ...

Page 6: ...he 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 displa...

Page 7: ...d the Auto program selected is Oatmeal T2 T1 K 2 min and 40 sec 0 1 160sec 0 1 16 sec Category P1 Power P2 Power K Factor Standard Omelet MEDIUM MEDIUM 0 2 2 5 Sensor reheat Only for sensor models 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 Rehea...

Page 8: ...minum heat sink may be HOT due to heat energy therefore extreme care should be taken during servicing 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 boa...

Page 9: ...ion 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 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 su...

Page 10: ...ctors from D P C 2 Remove 1 grounding screw 3 Disconnect connector CN701 on H V Inverter board 4 Remove 1 screw holding escutcheon base and slide the escutcheon base upward slightly 5 Remove all screws holding D P C board on escutcheon base 6 Separate D P C board from tabs on the escutcheon base and remove D P C board To replace membrane key board 7 Use tools such as kinfe etc to lift the edge of ...

Page 11: ...ifice 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 an...

Page 12: ...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 4 7 Steam sensor Only for sensor models 1 Disconnect connector CN2 from digital programmer circuit board 2 Disengage catch hooks on sensor cover C f...

Page 13: ...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 5 Bend back 1 locking metal tabs on 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...

Page 14: ...r 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 short 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 0Ω Close Ω Open 5 3 Ma...

Page 15: ...stops in 37 seconds after started 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 Clock pad once b Press Timer pad once c Press Start pad once d Press Power Level pad once 5 Program oven at High power for 1 minute and press Start pad a...

Page 16: ... 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 ...

Page 17: ...p 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 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 meas...

Page 18: ...7 4 At least once a year have the radiation monitor checked for calibration by its manufacturer 18 NN SD798S NN ST778S NN SA768W ...

Page 19: ... 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 b...

Page 20: ...tch 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 Check high voltage component according to component test procedure and replace if it is...

Page 21: ...rst you must program the DPC into TEST MODE press Clock pad once press Timer pad once Press Start pad once press Power Level pad once Program unit for operation H95 H97 H98 H99 appears in display window a short time after Start pad is pressed and there is no microwave oscillation Alternate way to troubleshoot oven with AC Ampere meter used H95 H97 H98 H99 appears in display window a short time aft...

Page 22: ...gnetron 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...

Page 23: ...8 6 How to check the semiconductors using an OHM meter 23 NN SD798S NN ST778S NN SA768W ...

Page 24: ...9 EXPLODED VIEW AND PARTS LIST 9 1 EXPLODED VIEW 24 NN SD798S NN ST778S NN SA768W ...

Page 25: ...00 HOOK LEVER A 1 15 F31374650AP HOOK LEVER B 1 16 F31384650AP HOOK LEVER C 1 17 F400A4T00AP FAN MOTOR 1 AC120V SINGLE PHASE 60Hz 18 F40084T00AP FAN BLADE 1 19 F40254W00AP AIR GUIDE A 1 20 F40264T60APG AIR GUIDE B 1 21 F41445W00AP ORIFICE 1 22 F64508660AP SENSOR COVER B 1 SD798S 24 F65434W00AP SENSOR COVER C 1 SD798S 25 J607S4M00AP STEAM SENSOR 1 SD798S 26 F612E5Y30AP INCANDESCENT LAMP U 1 125V 60...

Page 26: ...Ref No Part No Part Name Description Pcs Set Remarks 49 F04468Y30RP FUNCTION LABEL 1 SD798S 52 F00066G00RP CAUTION LABEL 1 SD798S RPH ST778S RPH 26 NN SD798S NN ST778S NN SA768W ...

Page 27: ... E3 F800L8Y30SRP ESCUTCHEON BASE U 1 SD798S E4 F66167D00AP FLAT CABLE 1 SD798S E5 F82988N00SAP BUTTON 1 SD798S E6 F891P8N40SAP DOOR OPENING BUTTON U 1 SD798S E7 F82565X00AP DOOR OPENING LEVER 1 SD798S E8 F80375K00AP COOK BUTTON SPRING 2 E9 F80098P00AP LED COVER A 1 SD798S E10 F90098N00AP GROUNDING PANEL 1 SD798S E11 F83928P00KAP DIAL 1 SD798S 27 NN SD798S NN ST778S NN SA768W ...

Page 28: ... AU 1 ST778S E23 F800L8Y40SRP ESCUTCHEON BASE U 1 ST778S E26 F80724W70SAP DOOR OPENING BUTTON U 1 ST778S E27 F82564W00AP DOOR OPENING LEVER 1 ST778S E28 F80375K00AP COOK BUTTON SPRING 1 E29 F630Y8Y40BRP MEMBRANE SWITCH U 1 ST778S E33 F81278Y40RP BACK PANEL 1 ST778S 28 NN SD798S NN ST778S NN SA768W ...

Page 29: ...IT DU 1 SA768W E43 F80347C50HAP ESCUTCHEON BASE 1 SA768W E44 F66164W20AP FLAT CABLE 1 SA768W E45 F82987D60KAP BUTTON 1 SA768W E46 F80727C50HAP DOOR OPENING BUTTON 1 SA768W E47 F82565X00AP DOOR OPENING LEVER 1 SA768W E48 F80375K00AP COOK BUTTON SPRING 1 SA768W E49 F630Y8Y50HRP MEMBRANE SWITCH U 1 SA768W 29 NN SD798S NN ST778S NN SA768W ...

Page 30: ...AP DOOR A U 1 SD798S D2 F301A8R50SAP DOOR A U 1 ST778S D3 F302K4W00AP DOOR E U 1 D4 F30215G10XN DOOR KEY SPRING 1 D5 F30854W00AP DOOR C 1 D6 F31454W00AP DOOR SCREEN A 1 D7 F31468N20HAP DOOR SCREEN B 1 SA768W D8 F30016J00HAP DOOR A 1 SA768W D10 F02459660AP DHHS LABEL 1 SD798S ST778S 30 NN SD798S NN ST778S NN SA768W ...

Page 31: ...ERIALS Ref No Part No Part Name Description Pcs Set Remarks W1 F030A6P40AG LEAD WIRE HARNESS 1 W2 F030E6G30AP H V LEAD WIRE 1 W3 F03537B70AP LEAD WIRE HARNESS U 1 INCLUDING THERMISTOR 31 NN SD798S NN ST778S NN SA768W ...

Page 32: ...S RPH P2 F01028Y50HRP PACKING CASE PAPER 1 SA768W RPH P3 F01044W00AP UPPER FILLER 1 SD798S ST778S P3 F01045J00AP UPPER FILLER 1 SA768W P4 F01054W00AP LOWER FILLER 1 SD798S ST778S P4 F01055J00AP LOWER FILLER 1 SA768W P5 F01067C50AP P E BAG 1 SD798S ST778S P5 F01064W00AP P E BAG 1 SA768W P6 F01074W00AP DOOR SHEET 1 P7 F06014W00AP COOKING TRAY 1 P8 F01084W00AP TRAY PACKING 1 P9 F01924U00AP SHEET 1 P1...

Page 33: ...10 DIGITAL PROGRAMMER CIRCUIT 10 1 NN SD778S 33 NN SD798S NN ST778S NN SA768W ...

Page 34: ...34 NN SD798S NN ST778S NN SA768W ...

Page 35: ...10 2 NN ST778S 35 NN SD798S NN ST778S NN SA768W ...

Page 36: ...36 NN SD798S NN ST778S NN SA768W ...

Page 37: ...10 3 NN SA768W 37 NN SD798S NN ST778S NN SA768W ...

Page 38: ...38 NN SD798S NN ST778S NN SA768W ...

Page 39: ... 1 270Ω 1 4W 5 R124 D0AE470JA155 CARBON FILM RESISTOR 1 47Ω 1 4W 5 R229 D0AE680JA155 CARBON FILM RESISTOR 1 68Ω 1 4W 5 RY1 AEBGJQC25F18 POWER RELAY 1 RY2 K6B1AZA00011 POWER RELAY 1 T10 G4C3AAD00006 LOW VOLTAGE TRANSFORMER 1 120V VZ490 D3BB6103A006 VARISTOR 1 RE80 EVEJ1HF2224B REVOLVING ENCODER 1 SW40 SW44 SW46 SW51 EVQ11L05R SWITCH 11 ZD110 B0BA3R500006 ZENER DIODE 1 ZD220 B0BA01100004 ZENER DIODE...

Page 40: ...0E DIODE 7 D10 D11 D12 D13 B0EAKT000025 DIODE 4 D25 D4EAY271A036 ZENER RESISTOR 1 270V D26 D27 D4EAY112A036 ZENER RESISTOR 2 1100V R44 R10 R11 R311 D0AE102JA155 CARBON FILM RESISTOR 4 1KΩ 1 4W 5 R12 D0AE103JA155 CARBON FILM RESISTOR 1 10KΩ 1 4W 5 R290 D0AE104JA155 CARBON FILM RESISTOR 1 100K 1 4W 5 RY1 AEBGJQC25F18 POWER RELAY 1 RY2 K6B1AZA00011 POWER RELAY 1 T10 G4C2AAD00005 LOW VOLTAGE TRANSFORM...

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