Panasonic NN-CS597S APH Service Manual Download Page 32 | Manualshive

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10.3. Troubleshooting of inverter circuit (U) and magnetron

This oven is programmed with a self diagnostics failure code system which will help for troubleshooting. H95, H97, H98 and H99
are the provided failure codes to indicate magnetron and inverter circuit problem areas. This section explains failure codes of H95,
H97, H98 and H99. First, you must program the DPC into TEST MODE, press Timer/Clock pad twice

→

Press Start button

once

→

press Microwave pad once. Program unit for operation. H95, H97, H98, H99 appears in display window a short time after

start button 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] button is pressed and no microwave oscillation with AC
Ampere meter used for troubleshooting.

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Summary of Contents for NN-CS597S APH

Page 1: ...Panasonic Home Appliances Microwave Oven Shanghai Co Ltd All rights reserved Unauthorized copying and distribution is a violation of law NN CS597S APH USA CPH CANADA Microwave Oven ORDER NO PHAMOS0705036C1 E1 ...

Page 2: ...2 NN CS597S ...

Page 3: ...3 NN CS597S ...

Page 4: ...h Switch interlocks Power Relay RY1 23 7 2 Monitor Interlock Switch 23 7 3 Magnetron 23 7 4 key board membrane Membrane switch assembly 23 7 5 Inverter power supply U 24 7 6 Temperature thermistor 24 7 7 Oven circuit breaker 24 8 MEASUREMENTS AND ADJUSTMENTS 25 8 1 Adjustment of primary latch switch secondary latch switch and monitor interlock switch 25 8 2 Measurement of microwave output 26 9 PRO...

Page 5: ...1 FEATURE CHART 2 CONTROL PANEL 5 NN CS597S ...

Page 6: ...3 SCHEMATIC DIAGRAM 3 1 APH 6 NN CS597S ...

Page 7: ...3 2 CPH 7 NN CS597S ...

Page 8: ...hen the Auto Menu feature is selected and the Start button is tapped 1 The digital programer circuit determines the power level and cooking time to complete cooking and indicates the operating state in the display window Table shows the corresponding cooking times for respective serving by categories Inverter Turbo Defrost SELECTED WEIGHT COOKING TIME 1 0 kg 11 min 15 sec Auto Reheat SELECTED WEIG...

Page 9: ...The digital programmer circuit senses the oven cavity temperature through oven temp sensor thermistor When the oven temperature reaches the set temperature DPC stops supplying high level signal to the power relay and the bake heater turn off 4 After the bake heater turn off the oven temperature will continue increasing for a while and then decrease as shown in Figure below When the oven temperatur...

Page 10: ...g start button oven preheat will start and then water supply begins It will take 1 minute for preheating When preheat is completed it will turn into actual cooking process During heating the temperature sensor Thermistor located on steam heater will monitor steam heater temperature and when it exceeds 390 F 200 C the additional water will be supplied to maintain moisture steam within oven cavity 1...

Page 11: ...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 reinforcement and grounding bracket must be connected to the chassis If the inv...

Page 12: ...abs are not bent broken or deficient in their ability to hold the switches 5 6 Avoid inserting nails wire etc through any holes in the unit during operation 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 7 Verification after repair CAUTION After repair or replacem...

Page 13: ...aks out Wipe up excess water throughly with the dry cloth CAUTION After repair or replacement of parts make sure that all the water pipes and tubes are properly connected otherwise the water might invade the electric parts and will cause a short circuit or electric shock 6 1 Magnetron 1 Discharge the high voltage capacitor see page 11 for instructions 2 Remove 2 screws holding the inverter reinfor...

Page 14: ... to pump from copper pipe 4 Disconnect wiring connectors CN3 CN4 CN8 and all connectors connecting to power relays from D P C board HU relay board 5 Disconnect wiring connector CN2 from D P C board DU power supply board 6 Remove 1 screw holding escutcheon base on cavity front plate 7 Open the door of oven slide the escutcheon base upward and out slightly 8 Disconnect connector CN6 connecting pump ...

Page 15: ...rminal contacts carefully 6 4 H V Inverter 1 Discharge high voltage remaining in high voltage capacitor 2 Remove 2 screws holding the inverter reinforcement grounding bracket A on oven cavity 3 Remove 2 screws holding inverter reinforcement bracket B on cavity top plate 4 Remove 1 screw holding oven thermistor on cavity top plate 5 Release lead wire harness from locking tabs on Inverter bracket A ...

Page 16: ... removing door springs 2 When mounting the door to the oven be sure to adjust the door parallel to the cavity front plate by moving hinges back or forward 3 Adjust so that the upper portion of the door will touch firmly to the oven cavity front plate without pushing the door If the door assembly is not mounted properly microwave power may leak from the clearance between the door and oven 4 Be sure...

Page 17: ...gle tab to the base using a screw 6 8 Pump motor 1 Remove water tank from escutcheon base 2 Keep pressing Microwave with Steam pad for more than 2 seconds to drain the water remaining in the water pipes and tubes into oven cavity 3 Pull out tube A connecting to pump motor from copper pipe 4 Disconnect all wiring connectors from D P C board HU relay board 5 Remove 1 grounding screw holding on cavit...

Page 18: ...on base 2 Keep pressing Microwave with Steam pad for more than 2 seconds to drain the water remaining in the water pipes and tubes into oven cavity 3 Remove tubes from both ends of copper pipe 4 Remove 1 screw holding air guide B on the base 5 Release catch of nozzle holding copper pipe 6 Remove left and right door key springs from door arm NOTE Support door before removing door springs 7 Turn ove...

Page 19: ...cutout bracket along with heater DU To install thermistor NOTE Before installing thermistor please fill enough silicon grease into the installation hole of heater DU for good conductibility 6 10 Bake fan motor and bake heater 1 Remove 6 screws to remove rear cover 2 Disconnect 2 lead wires from the harness of noise filter U which are connected to both Neutral and live lead wire of oven circuit bre...

Page 20: ... Release 3 metal tabs which are holding the insulated wire harness to the bake heater outside cover 9 Disconnect 2 lead wires from thermal cutout and bake fan motor terminals respectively 10 Remove 4 screws holding bake heater outside cover onto cavity back plate 11 Remove 4 screws shown below from the face of bake heater outside cover 12 Release tabs between side of bake heater outside cover and ...

Page 21: ... cover 15 Remove 2 screws holding bake heater onto bake heater inside cover To replace bake fan motor 16 Remove 1 nut holding the bake heater fan blade then remove fan blade form the fan motor shaft 17 Remove 3 screws holding the bake fan motor mounting bracket onto the bake heater inside cover 18 Remove bake heater fan blade and cooling fan blade from bake fan motor shaft 19 Remove 2 screws holdi...

Page 22: ...U in and out slightly to confirm if the lead wire s move freely and are not pinched or pressed under the oven circuit breaker cover If the lead wire s are pinched or pressed the insulation of the wire s might be damaged and will cause electric shock 3 Make sure that the same side input and output lead wires are same color while connecting the terminals The left side lead wires are gray and the rig...

Page 23: ...7 2 Monitor 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 O...

Page 24: ...ins unplugged 3 Plug in the oven s AC power supply cord into outlet 4 Program DPC a Press Timer Clock pad twice b Press Start button once c Press Microwave pad 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 sto...

Page 25: ...the oven assembly adjust the bracket assembly by moving it in the direction of the arrows in the illustration so that the oven door will not have any play in it Make sure that all latch switches work properly after adjustment is completed Completely tighten the screws holding the interlock mounting bracket assembly to the oven assembly 4 Reconnect the monitor interlock switch and check the continu...

Page 26: ...er the magnetron output Take the temperature readings and heating time as accurately as possible 1 Fill the beaker with exactly one liter of tap water Stir the water using the thermometer and record the water s temperature recorded as T1 2 Place the beaker on the center of oven cavity floor Set the oven for High power and heat it for exactly one minute 3 Stir the water again and read the temperatu...

Page 27: ...ge always use the 2 inch 5cm spacer supplied with the probe 4 Tap 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 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 componen...

Page 28: ...9 4 At least once a year have the radiation monitor checked for calibration by its manufacturer 28 NN CS597S ...

Page 29: ...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 be mistaken for the oven s malfunction Self diagnostic display Oven has self diagnostic...

Page 30: ...gnetron 2 Loose lead wire connector CN703 3 H V Inverter U Oven stops in 1 minute after pressing start button Bake function Oven thermistor circuit is not functioning 1 Oven thermistor 2 Loose wiring Oven stops in 30 seconds after pressing start button Steam function Steam heater thermistor circuit is not functioning 1 Steam heater thermistor 2 Loose wiring 3 bad conductibility between thermistor ...

Page 31: ...motor turn on 1 2 Off alignment of primary latch switch 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 Adjust door and latch switches 3 Defective high voltage component H V Inverter Power Supply U Magnetron Check high volt...

Page 32: ...H98 and H99 First you must program the DPC into TEST MODE press Timer Clock pad twice Press Start button once press Microwave pad once Program unit for operation H95 H97 H98 H99 appears in display window a short time after start button 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...

Page 33: ...rmal Display H95 H97 H98 appears in window and oven stops operation Program High power for 1 minute and conduct following test quickly unless H95 H97 H98 appears and oven stops 1 Unplug CN702 2 pin connector and measure voltage between terminals Abnormal 0V 1 Latch Switch 2 D P C Power Relay Normal 120V Step2 2 Unplug CN701 3 pin connector and measure pin3 voltage Abnormal 0V D P C Approx AC 3V Ma...

Page 34: ...10 6 How to check the semiconductors using an OHM meter 34 NN CS597S ...

Page 35: ...11 EXPLODED VIEW AND PARTS LIST 11 1 EXPLODED VIEW 35 NN CS597S ...

Page 36: ...IMARY LATCH SWITCH 27 A61425180AP MICRO SWITCH 1 L 3C2 2 SECONDARY LATCH SWITCH 28 A61785180AP MICRO SWITCH 1 L 2C2 2 MONITOR INTERLOCK SWITCH 29 F603Y6Y40AP D P CIRCUIT DU 1 30 F62308F00AP FUSE 1 20A 31 F692Y6Y40AP NOISE FILTER U 1 32 F45006Y40XP JACKET 1 33 F900C8S70AP AC CORD W PLUG 1 34 F20347J70XPG INVERTER BRACKET A 1 35 F2036 1K00 INVERTER BRACKET B 1 36 F606Y8M00AP H V INVERTER U 1 37 F802...

Page 37: ...FORCE BRACKET E 1 105 F10578S70AP REAR COVER 1 111 F00338S70AP FUSE LABEL 1 112 F01728S70AP CAUTION LABEL 1 APH 112 F01728S70CP CAUTION LABEL 1 CPH 113 F00068S70AP CAUTION LABEL 1 APH 114 F32918S70AP SWITCH HOLDER 1 115 F32928S70AP LATCH SWITCH LEVER 1 116 F60318S70AP DU BOARD BRACKET 1 117 F92038S70AP COPPER PIPE HOLDER 1 118 F40308S70AP AIR GUIDE D 1 119 F62388S70AP PLASTIC SHEET 1 11 3 WATER TA...

Page 38: ... F66168J00XP FLAT CABLE 1 WIDE ONE E14 F66166Y40XP FLAT CABLE 1 NARROW ONE E15 F44266Y40BP SEAL B 1 E16 F46487J70XP TUBE A 1 E17 F46497J70XP TUBE B 1 E18 F45126Y40BP TIE IN B 1 E19 F80876Y40BP GROUNDING PANEL 1 E20 F01578S70AP NAME PLATE 1 APH E20 F01578S70CP NAME PLATE 1 CPH E21 F81246Y40XP BRACKET 1 11 5 H V INVERTER BOARD MAIN PARTS LIST F606Y8M00AP Ref No Part No Part Name Description Pcs Set ...

Page 39: ...1 D7 F32306Y40BP DOOR KEY SPRING B 1 D8 F02459660AP DHHS LABEL 1 APH D8 F04114180CP HC LABEL 1 CPH D9 F30998S70AP CLIP 1 11 7 WIRING MATERIALS Ref No Part No Part Name Description Pcs Set Remarks W1 F030A8S70AP LEAD WIRE HARNESS 1 APH INCLUDING OVEN THERMISTOR STEAM HEATER THERMISTOR W1 F030A8S70CP LEAD WIRE HARNESS 1 CPH INCLUDING OVEN THERMISTOR STEAM HEATER THERMISTOR W2 F030E 1L40 H V LEAD WIR...

Page 40: ...066Y40XP P E BAG 1 P6 F01078100XN DOOR SHEET 1 P7 F06217J70XP GLASS TRAY 1 P8 F01126Y40XP FOAM 1 P9 F01136Y40XP FOAM 1 P11 F60037J70XP CERAMIC COVER 1 P12 F01126Y40BP FOAM 1 P13 F06038S70CP METAL PAN 1 P14 F000B8S70AP COOK BOOK 1 APH P14 F000B8S70CP COOK BOOK 1 CPH P15 F01926Y40XP SHEET 1 P17 F01096Y40XP SHEET 1 P18 F01898S70AP PROTECT CORNER 2 P19 F02246Y40BP NOTICE 1 P27 F04458S70CP OVERLAY 1 CP...

Page 41: ...12 DIGITAL PROGRAMMER CIRCUIT 12 1 SCHEMATIC DIAGRAM 41 NN CS597S ...

Page 42: ...42 NN CS597S 05 07 ChengWei S 8S7 Printed in China ...

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