Panasonic NN-GD356W Service Manual Download Page 18 | Manualshive

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7.2. Trouble related to Digital Programmer Circuit

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NN-GD376S / NN-GD366M / NN-GD356W

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Summary of Contents for NN-GD356W

Page 1: ...hanghai Co Ltd All rights reserved Unauthorized copying and distribution is a violation of law NN GD376S NN GD366M NN GD356W BPQ U K EPG France Italy Finland Spain Portugal Greece Poland Holland WPG Switzerland Microwave Oven ORDER NO PHAMOS0605031C2 ...

Page 2: ...2 NN GD376S NN GD366M NN GD356W ...

Page 3: ...3 NN GD376S NN GD366M NN GD356W ...

Page 4: ... door switch and power relay B interlocks 13 5 2 Short switch monitor 13 5 3 Magnetron 13 5 4 Membrane key board Membrane switch assembly 13 5 5 Inverter power supply U 14 5 6 Temperature thermistor 14 6 MEASUREMENTS AND ADJUSTMENTS 15 6 1 Adjustment of Primary latch switch Secondary latch switch and Short switch 15 6 2 Measurement of microwave output 15 7 TROUBLESHOOTING GUIDE 16 7 1 Trouble Oven...

Page 5: ...1 SCHEMATIC DIAGRAM 5 NN GD376S NN GD366M NN GD356W ...

Page 6: ...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 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...

Page 7: ...t grounding The high voltage inverter power supply circuit board must have a proper chassis ground The inverter grounding bracket 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 earth bracket WARNING DISCHARGE THE HIGH VOLATGE CAPACIT...

Page 8: ...t of parts make sure that the screws of the oven etc are neither loose nor missing Microwaves 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 MICROWAVE RADIATION USE CAUTION NOT TO BECOME EXPOSED ...

Page 9: ...N When connecting 2 filament lead wires to the magnetron terminals be sure to connect the lead wires in the correct position The lead wire of high volatge transformer should be connected to F terminal and the lead wire from high voltage capacitor should be connected to FA terminal 4 2 Digital programmer circuit D P C and membrane key board NOTE Be sure to ground any static electric charge built up...

Page 10: ... board is as follows Membrane key board Right and upper edges Escutcheon sheet Right and upper edges 4 3 Low voltage transformer and or power relays RY1 RY2 NOTE Be sure to ground any static electric charge built up on your body before handling the DPC 1 Using solder wick or a desoldering tool and 30W soldering iron carefully remove all solder from the terminal pins of the low voltage transformer ...

Page 11: ...alignment is achieved NOTE After replacement of the defective component parts of the door reassemble and perform microwave leakage test 4 6 Turntable motor 1 Remove the motor cover by breaking off at the 4 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 expose...

Page 12: ... lead wire from magnetron terminals 2 Disconnect 2 connectors from CN701 CN702 on H V inverter U 3 Remove 1 screw holding grounding 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 to the inverter bracket 12 NN GD376S NN GD366M NN GD356W ...

Page 13: ...monitor 1 Unplug lead wires from Inverter Power Supply U primary terminals 2 Connect test probes of ohm meter to the disconnected leads which 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 Ω 5 3 Magnetron Continuity ch...

Page 14: ...AMPERE FAILURE CODE Unplug CN703 0 5 to 1A Oven stops in 23 seconds after started Test2 Continued from Test 1 1 Unplug 3 pin connector CN701 CN703 remains unplugged 2 Program oven at High power for 1 minute and press start a After approximately 3 seconds oven stops b During oven operation input current is approximately 0 4A INPUT AMPERE FAILURE CODE Unplug CN701 0 4A Oven stops in 3 seconds after ...

Page 15: ...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...

Page 16: ...damage this control panel Always touch yourself to ground while working on this panel to discharge any static charge in your body 7 230 240V 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 c...

Page 17: ...uit 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 Adjust door and latch switches 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 wi...

Page 18: ...7 2 Trouble related to Digital Programmer Circuit 18 NN GD376S NN GD366M NN GD356W ...

Page 19: ...f H95 H97 H98 and H99 First you must program the DPC by pressing Reheat pad once and then pressing 10 min pad thrice Program unit for operation H95 H97 H98 H99 appears in display window a short time after start key 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 after start key is p...

Page 20: ...edure Power will Ammeter reading is To do Remedy Shut off in 23 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 F606YM300GP 2 D702 is OK Replace magnetron Shut off in 3 seconds after Start 1 Less than ...

Page 21: ...8 EXPLODED VIEW AND PARTS LIST 8 1 EXPLODED VIEW 21 NN GD376S NN GD366M NN GD356W ...

Page 22: ...61414T00AP MICRO SWITCH 1 D3V 16G 3C25 SECONDARY LATCH SWITCH 21 F61785U30XN SHORT SWITCH 1 D3V 1G 2C25 SHORT SWITCH 22 2M261 M22J3Y MAGNETRON 1 23 F606YM300BP H V INVERTER U 1 24 F65857K10XP INVERTER BRACKET 1 25 F66627K10XP GROUNDING PLATE 1 27 F62306V60BP FUSE 1 10A 250V 29 F63266S30XP TURNTABLE MOTOR 1 30 F900C8H00BP AC CORD W PLUG 1 BPQ 30 F900C7K10ZP AC CORD W PLUG 1 EPG 30 F900C8H20WP AC CO...

Page 23: ...0858H00XP DOOR C 1 D6 F31455G10XN DOOR SCREEN A 1 D7 F31468H10EP DOOR SCREEN B 1 GD366M GD356W D8 F301A8H00SBP DOOR A U 1 GD376S BPQ D8 F301A8H00SEP DOOR A U 1 GD376S EPG 8 4 WIRING MATERIALS Ref No Part No Part Name Description Pcs Set Remarks W1 F030A8H00BP LEAD WIRE HARNESS 1 W2 F030E7K10ZP H V LEAD WIRE 1 W3 F03537K10XP LEAD WIRE HARNESS U 1 INCLUDING THERMISTOR W4 F030F7K10XP HARNESS B 1 23 N...

Page 24: ...UTCHEON BASE U 1 GD376S EPG E4 F891P8H00SXP DOOR OPENING BUTTON U 1 GD376S E5 F82566K10AP DOOR OPENING LEVEL 1 GD376S E6 F80375K00AP COOK BUTTON SPRING 1 E7 F90098H00XP GROUNDING PANEL 1 GD376S E8 F803G8H00SXP POP UP DIAL U 1 GD376S E9 F80188H00XP BACKSTOP 1 E10 F82988H00KBP BUTTON 1 GD376S E13 F66168H00EP FLAT CABLE 1 GD376S E15 F00078H00SBP NAME PLATE 1 GD376S BPQ E15 F00078H00SEP NAME PLATE 1 G...

Page 25: ...ING BUTTON 1 GD356W E25 F82565Y00AP DOOR OPENING LEVEL 1 GD366M GD356W E26 F80375K00AP COOK BUTTON SPRING 1 E28 F803G8H10SXP POP UP DIAL U 1 GD366M E28 F803G8H20HXP POP UP DIAL U 1 GD356W E29 F80188H00XP BACKSTOP 1 E32 F630Y8H10SEP MEMBRANE SWITCH U 1 GD366M EPG E32 F630Y8H20HEP MEMBRANE SWITCH U 1 GD356W EPG WPG E33 F66167D00AP FLAT CABLE 1 GD366M GD356W E35 F00078H10SEP NAME PLATE 1 GD366M EPG E...

Page 26: ...OKING TRAY 1 P8 F01924T00AP SHEET 1 GD376S GD366M P9 F01085G50XN TRAY PACKING 1 P10 F060V8H00BP OVEN RACK 1 P12 F01565U50EP NOTICE 1 EPG 8 7 H V INVERTER MAIN PARTS LIST Ref No Part No Part Name Description Pcs Set Remarks Q701 A691EM300BP IGBT 1 Q702 IGBT 1 C701 ECWF5184N300 FILM CAPACITOR 1 C702 ECQE2505T869 FILM CAPACITOR 1 C703 ECWF2395N632 FILM CAPACITOR 1 DB701 B0FBBS000001 RECTIFIER BRIDGE ...

Page 27: ...9 DIGITAL PROGRAMMER CIRCUIT 9 1 SCHEMATIC DIAGRAM NN GD376S 27 NN GD376S NN GD366M NN GD356W ...

Page 28: ...28 NN GD376S NN GD366M NN GD356W ...

Page 29: ...9 2 SCHEMATIC DIAGRAM NN GD366M GD356W 29 NN GD376S NN GD366M NN GD356W ...

Page 30: ...30 NN GD376S NN GD366M NN GD356W ...

Page 31: ... 2SB0709A0L CHIP TRANSISTOR 1 Q222 Q330 UNR211100L CHIP TRANSISTOR 2 Q182 Q210 Q331 UNR221M00L CHIP TRANSISTOR 3 R320 D0GBR00JA071 CHIP RESISTOR 1 0Ω 1 10W 5 R181 D0GB360JA072 CHIP RESISTOR 1 36Ω 1 10W 5 R227 R331 D0GB471JA069 CHIP RESISTOR 2 470Ω 1 10W 5 R14 D0GB681JA069 CHIP RESISTOR 1 680Ω 1 10W 5 R82 R83 R224 R226 R350 R442 D0GB102JA071 CHIP RESISTOR 6 1KΩ 1 10W 5 R220 R229 R232 D0GB222JA072 C...

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