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Panasonic NN-SD372, Service Manual

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Panasonic NN-SD372 Service Manual Download Page 14

6.7. H.V. Inverter Power Supply

 1. Disconnect 2 high voltage lead wires from magnetron

filament terminals.

 2. Unplug connector CN701 & CN702 from H.V. Inverter

board.

 3. Remove 1 screw holding gro unding plate on the base.
 4. Remove 1 screw holding inverter bracket on the base.

 5. Slide 2 locking tabs of inverter bracket at the bottom of the

base in direction of arrows.

 6. Remove 2 screws holding H.V. inverter on the inverter

bracket.

14

NN-SD372S

Summary of Contents for NN-SD372

Page 1: ... Panasonic Appliances Microwave Oven Shanghai Co Ltd 2012 NN SD372S APH USA Microwave Oven ORDER NO PAPMOSH1201009CE ...

Page 2: ...2 NN SD372S ...

Page 3: ...3 NN SD372S ...

Page 4: ...ature thermistor 16 8 MEASUREMENTS AND ADJUSTMENTS 17 8 1 Adjustment of primary interlock switch secondary interlock switch and monitor switch 17 8 2 Measurement of microwave output 17 9 PROCEDURE FOR MEASURING MICROWAVE ENERGY LEAKAGE 18 9 1 Equipment 18 9 2 Procedure for measuring radiation leakage 18 9 3 Record keeping and notification after measurement 18 9 4 At least once a year have the radi...

Page 5: ...1 FEATURE CHART 2 CONTROL PANEL 5 NN SD372S ...

Page 6: ...3 SCHEMATIC DIAGRAM 6 NN SD372S ...

Page 7: ... OFF by the 20 to 40 kHz PWM pulse width modulation signal from the microcomputer in the DPC 3 This drives the High voltage transformer 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 is always monitored by the signal...

Page 8: ...nk The aluminum 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 in...

Page 9: ...n 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 5 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...

Page 10: ...ve 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 6 2 Digital programmer circuit D P C CAUTION Be sure to ground any static electric charge built up in yo...

Page 11: ... or power relays NOTE Do not use a soldering iron or desoldering tool of more than 30 watts on D P C contacts 2 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 6 4 DC fan motor 1 Disconnect DC fan motor connect CN15 fro...

Page 12: ... door reassemble it properly and adjustment so as to prevent an excessive microwave leakage Adjustment of the door assembly Refer page 17 7 Place the hole of hinge A into the door s upper hinge pin 8 Use your left index finger to support the door s lower hinge pin while guiding the door s hinge A into the cavity slot Then lower your finger to seat the door onto the hinge NOTE Door alignment is cru...

Page 13: ...OTE After removing the motor cover be sure that cut portions are properly trimmed off 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 1 screw NOTE After reinstalling the new turntable motor and reconnecting the 2 lead wires reinstall the motor cover by rotating it around 180 ...

Page 14: ...ector CN701 CN702 from H V Inverter board 3 Remove 1 screw holding gro unding plate on the base 4 Remove 1 screw holding inverter bracket on the base 5 Slide 2 locking tabs of inverter bracket at the bottom of the base in direction of arrows 6 Remove 2 screws holding H V inverter on the inverter bracket 14 NN SD372S ...

Page 15: ...Ω Open 7 2 Monitor 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 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 Op...

Page 16: ...n the oven s AC power supply cord into outlet 4 Program DPC a Press Timer Clock button twice b Press Start button once c Press Power Level button once 5 Program oven at High power for 1 minute and press Start button 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 second...

Page 17: ...ock switches again by following the component test procedures 8 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 stopwat...

Page 18: ...kage always use the 2 inch 5cm spacer supplied with the probe 4 Tap the Start pad or set the timer and with the magnetron oscillating measure the leakage by holding the probe perpendicular to the surface being measured 9 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 component...

Page 19: ...9 4 At least once a year have the radiation monitor checked for calibration by its manufacturer 19 NN SD372S ...

Page 20: ...e 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 H97 H98 error code display If 3 times H97 or 2 times H98 exist microwave oven can not be used any more even if the defective parts already be replaced un plug and plug in again How to reset for the service Please take the following...

Page 21: ...or CN701 CN702 4 H V Inverter U Oven stops in 23 seconds after pressing Start button H V Inverter U operates by the control signals from DPC but magnetron is not oscillating 1 Magnetron 2 Loose lead wire connector CN703 3 H V Inverter U 2 No display and no operation at all Fuse is blown Most probably loose connection of connectors or door latch mechanism is not adjusted properly 1 Allign door Door...

Page 22: ...e 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 defective 4 Open or loose wiring of power relay RY1 5 Defective primary interlock switch 6 Defective DPC or power relay RY1 Refer to DPC tro...

Page 23: ... and H99 First you must program the DPC into TEST MODE press Timer Clock button twice press Start button once press Power Level button 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 ti...

Page 24: ...ector of Q220 voltage Abnormal Q220 and or Q221 Q225 Q227 Normal 0 7V Step3 3 Short circuit between collector of Q220 and emitter of Q225 Still not turn on RY1 RY1 turns on Q220 and or Q221 Q225 Q227 Dark or unclear display 1 Replace display and check operation Normal Display Abnormal IC1 Missing or lighting of unnecessary segment 1 Replace IC1 and check operation Normal IC1 Abnormal Display H95 H...

Page 25: ...gnetron 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 F606Y8X00AP 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...

Page 26: ...10 7 How to check the semiconductors using an OHM meter 26 NN SD372S ...

Page 27: ...11 EXPLODED VIEW AND PARTS LIST 11 1 EXPLODED VIEW 27 NN SD372S ...

Page 28: ... AIR GUIDE A 1 17 F4144BA00EP ORIFICE 1 18 F605SBA00BP D P CIRCUIT HU 1 LED LAMP INSIDE 19 F61425U30XN MICRO SWITCH 1 PRIMARY INTERLOCK SWITCH 20 F61415U30XN MICRO SWITCH 1 SECONDARY INTERLOCK SWITCH 21 F61785U30XN MICRO SWITCH 1 MONITOR SWITCH 22 2M236 M36R MAGNETRON 1 23 F606Y8X00AP H V INVERTER U 1 24 F6585BA00EP INVERTER BRACKET 1 25 F66629W40HP GROUNDING PLATE 1 27 F62309V60AP FUSE 1 15A 29 F...

Page 29: ...P D P CIRCUIT DU 1 E3 F800LBA70SAP ESCUTCHEON BASE U 1 E4 F891PBA00SEP DOOR OPENING BUTTON U 1 E5 F8256BA00EP DOOR OPENING LEVER 1 E6 F80375K00AP COOK BUTTON SPRING 1 E7 F9009BA00EP GROUNDING PANEL 1 E8 F803GBA00SEP POP OUT DIAL U 1 E9 F8018BA00EP DIAL SUPPORT 1 E10 F8298BA00SBP BUTTON 1 E13 F66168J00XP FLAT CABLE 1 29 NN SD372S ...

Page 30: ...ame Description Pcs Set Remarks D1 F3018BA70AP DOOR KEY A 1 D3 F302KBA00EP DOOR E U 1 D4 F30215G10XN DOOR KEY SPRING 1 D5 F30859V00XP DOOR C 1 D6 F3145BA60CP DOOR SCREEN A 1 D8 F302ABA00SEP DOOR A U 1 D10 F02459660AP DHHS LABEL 1 30 NN SD372S ...

Page 31: ...11 5 WIRING MATERIALS Ref No Part No Part Name Description Pcs Set Remarks W1 F030ABA70AP LEAD WIRE HARNESS 1 W2 F030EBA70AP H V LEAD WIRE 1 31 NN SD372S ...

Page 32: ...Pcs Set Remarks P1 F0003BA70AP INSTRUCTION MANUAL 1 P2 F0102BA70SAP PACKING CASE PAPER 1 P3 F01049V00XP UPPER FILLER 1 P4 F01059V00XP LOWER FILLER 1 P5 F01068100XN P E BAG 1 P6 F01075G10XN DOOR SHEET 1 P7 A0601BA00EP COOKING TRAY 1 P8 F01924T00AP SHEET 1 32 NN SD372S ...

Page 33: ...12 DIGITAL PROGRAMMER CIRCUIT 12 1 SCHEMATIC DIAGRAM 33 NN SD372S ...

Page 34: ...34 NN SD372S ...

Page 35: ...0096 LCD 1 F66177D60AP LCD HOLDER 1 F67525E20XN DIFFUSION SHEET 1 D32 D4EAY271A036 ZENER RESISTOR 1 270V IC1 MN69F009AY1 L S I 1 RY1 AEBGJQC25F12 POWER RELAY 1 T10 G4DYA0000326 LOW VOLTAGE TRANSFORMER 1 SW40 SW41 SW54 SW62 EVQ11L05R SWITCH 11 RE81 EVEJ1HF2224B REVOLVING ENCODER 1 35 NN SD372S 01 12 S BA7 Printed in China ...

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