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Panasonic NE-7910, Service Manual

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Summary of Contents for NE-7910

Page 1: ...mer 99 minutes 99 seconds Cooling Method Air Cooling Approximate Outside Dimensions 24 3 4 W x 18 1 2 D x14 3 4 H 63 0 cm W x 47 0 cm D x 37 5 cm H Approximate Oven Cavity Dimensions 15 1 2 W x 15 1 2...

Page 2: ...any accident pertainingtomicro should immediately notifytheappropriate addresslisted below 2 IN U s A ng ee PANASONIC COMPANY Bivision of Matsushita M ECA Electric Corporation of America One Panasoni...

Page 3: ...eee eee eee tees 26 TROUBLESHOOTING GUIDE 260i cece eee ee eee e cnet e teens t erent ere see ees 27 COMPONENT TEST PROCEDURE 0 eee eee reser eres crs r erste reser 32 DIGITAL PROGRAMMER CIRCUIT TEST...

Page 4: ...pad reset button should be tapped to clear the display window or indicator lights _ If abnormal figures appear in the display window Example F9 3F correct by removing the plug from wall receptacle wai...

Page 5: ...efrost i e HIGH DEFROST TIMER PAD Example 18 min 45 sec 10 min pad One tap 10 sec pad Four taps 1 min pad Eight taps 1 sec pad Five taps DEFROST PAD When Defrost is selected the cycle will also progra...

Page 6: ...g the appropriate time pads Example To set 15 minutes and 30 seconds tap 10 min pad once 1 min pad 5 times 10 sec tap 3 times The cooking time appears in the Display Window Step 3 Tap START pad Microw...

Page 7: ...cond phase cooking time reappears in the Display Window and begins to count down Power Indicator Light shifts to second phase cooking power Indicator Light and blinks When second phase cooking time ha...

Page 8: ...le stops The display window indicates the TOD A remainder of calculated cooking time appears only with the A2 to AG settings With A1 setting the oven will shut off immediately when the auto sensor det...

Page 9: ...Y START This oven can delay the start of any cooking function by up to 99 minutes and 99 seconds Step 1 Set the length of time you would like to delay the start of cooking defrosting or auto sensor co...

Page 10: ...ing wooden containers for more than a few seconds Do not operate the oven with a kitchen towel or a napkin left between the door and the front wall of the oven Do not press the cook button when the ov...

Page 11: ...PROTECTION FROM MICROWAVE LEAKAGE FIRE AND ELECTRICAL SHOCK HAZARDS WHEN SERVICING IT tS ESSENTIAL THAT ONLY MANUFACTURERS SPECIFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SHADED AREA OF TH...

Page 12: ...ou set appears in the display window The digital programmer circuit memorizes the functions set When auto sensor cooking is set by tapping the auto sensor contro pad Auto indicator light turns on The...

Page 13: ...solid line so that oscillation begin The disturbance wave generated by the magnetron is prevented by the choke coils of 1 6H filter capacitors of 500pF and the magnetron s shielded case so that TV an...

Page 14: ...ation and this in turn stops magnetron 15A FUSE LATCH SWITCHB oscillation SECONDARY Fig 11 When the reset stop pad button is tapped once _ during cooking The digital programmer circuit cuts the D C vo...

Page 15: ...in this manual before the oven is released to the owner E A microwave leakage check to verify compliance with the Federal performance standard should be performed on each oven prior to release to the...

Page 16: ...fuse confirm that it has the appropriate rating for this model 5 Avoid inserting nails wire etc through any holes in the unit during operation Never insert a wire nail or any other metal object throug...

Page 17: ...n the waveguide and the magnetron ff i MAGNETRON Fig 14 NOTE Be sure to ground any static electric charge in your body before handling the digital programmer circuit ie Disconnect 10 pin connector and...

Page 18: ...e with the digital programmer circuit Remove eleven screws holding the digital programmer circuit to the escutcheon base NOTE A _ Remove two screws holding the low voltage transformer to new P C B bef...

Page 19: ...wire pin to remove pulley NOTE When installing the pulley A to shaft of fan motor the pulley A should be positioned on the hole at shaft end and be fixed by wire pin Otherwise the belt may be detached...

Page 20: ...check the diode first If the diode is shorted do not measure the diode current Otherwise 102 resistor will be burnt by AC current Measurement and adjustment of the diode current After replacement of t...

Page 21: ...28 and 29 GS WZ Latch switch A Latch switch A Door hook assemb Fig 28 Fig 29 No specific adjustment during installation of the latch switch A to the door hook is necessary B Installation of the door...

Page 22: ...nd short switch to the door hook is necessary ee a spring Door hook assembly B Installation of the door hook assembly to the oven assembly Fig 31 Adjust the door hook by moving it in the direction of...

Page 23: ...the temperature rises as T2A and T2B F The average value T2 of T2A and T2B is calculated as follows 7 T2A T2B 2 G Subtract T1 from T2 This will give you the temperature rise H The normal temperature...

Page 24: ...a tion leakage before the outer panel is installed and after all necessary components are replaced or adjusted Special care should be taken in measuring around the magnetron Fig 33 i WARNING j AVOID C...

Page 25: ...does erroneous readings may result When high leakage is suspected do not move the probe horizontally along the oven surface this may possibly cause probe damage Record keeping and notification after...

Page 26: ...e oven inserted tightly plug tightly Use the microwave oven at rv Baw Pew enNaliage adequate electrical power Lan nenamnnnenenan snes snnensveenerentnstitnstteet ated This is not in reality a problem...

Page 27: ...ROUBLE 1 The following visual conditions indicate a probable defective digital programmer circuit D P C 1 Incomplete segments Auto Sensor Cook Indicator Light A Segments missing Defrost Indicator Ligh...

Page 28: ...atch switch of latch switch Av fA primary latch and incorrect switch B secondary operation of latch and short switch switch B NOTE 1 Both no continuity ree aes Check continuity of Shorted winding Repl...

Page 29: ...f No Malfunction of _ Replace thermal cutout oven continuity therma cutout Check D C voltage L fov Defective digital Replace being supplied to programmer power relay coil circuit Ly between terminal F...

Page 30: ...witch Replace Refer to compo nent test pro cedure on page 33 Faulty insulation of filament winding of high voltage trans former Open secondary winding of high voltage trans former Refer to compo nent...

Page 31: ...al Fy NOTE 3 a Measure the diode Below Replace current at High 200 mA t Faulty magnetron power Aging change of Replace depending magnetron t on the result of output test Slightly below 280 mA NOTE 3 T...

Page 32: ...MER TERMINALS TERMINALS Oven chassis Fig 38 High voltage capacitor Check continuity of capacitor with meter on highest OHM scale A normal capacitor will show continuity for a short time and then indic...

Page 33: ...g test procedure Follow the procedure on page 20 for measuring the diode current Now select a power other than high and start the oven Observe the diode current and youcan tell ifthe switch contacts a...

Page 34: ...uit is in working order DIGITAL PROGRAMMER CIRCUIT TEST PROCEDURE After replacing the digital programmer circuit make the digital programmer circuit test according to the following procedures in order...

Page 35: ...lay shows Ab Touch the start pad to start auto cooking Abd The auto sensor cook indicator light blinks Fan motor and turntable begins to rotate Oven lamp turns on The oven lamp will dim a little about...

Page 36: ...uaag dVO9E0 E094NV uosjeuBew 104 ueaod 104 O ynoynd jewysy yno1no jeueEYUL USMS TOYS dVO0e6S7 LOANV OVO8LSPLOANV _ dvogdesl9aNv suewisy uondioseq og awe weg ON eg syed paijioeds s sainjoeynuew Ajuo as...

Page 37: ...EXPLODED VIEW For screws washer and nut see page 40 FOR NE 7810 NE 7810C SEE PAGE 40 PAGE 39 SEE PAGE 40 FOR NE 7910 NE 7910C SS ee eS SS cera e a Cro__ SSS SS SS7 say ai 59 FOR NE 7910 NE 7810 37...

Page 38: ...crews washer and nut see page 40 WIRING MATERIAL DIGITAL PROGRAMMER CIRCUIT DIGITAL PROGRAMMER CIRCUIT FOR NE 7910 NE 7910C feat FOR NE 7810 NE 7810C For screws washer and nut see page 40 White Insula...

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