Models > NN-SN757S

NN-SN757S Panasonic Microwave - Overview

Sections of the NN-SN757S

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Keep searches simple, eg. "belt" or "pump".
Micro Switch – Part Number: 3B73362F
Micro Switch
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(12)
PartSelect #: PS3522738
Manufacturer #: 3B73362F
This microwave door switch provides power to the various components in the microwave when the door is in a closed position, and interrupts power when the door is open. This door switch is approximatel...
$11.27
  In Stock
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Door Hook – Part Number: F30206G30CP
Door Hook
PartSelect #: PS12688400
Manufacturer #: F30206G30CP
Door switch holder bracket
  No Longer Available
Power Cord – Part Number: F900C4T00AP
Power Cord
PartSelect #: PS12666424
Manufacturer #: F900C4T00AP
Power cord
  No Longer Available
Line Fuse – Part Number: B62308250AP
Line Fuse
PartSelect #: PS12694096
Manufacturer #: B62308250AP
Fuse
  No Longer Available
Fan blade – Part Number: F40084T00AP
Fan blade
PartSelect #: PS12680243
Manufacturer #: F40084T00AP
  No Longer Available
Main Control Board – Part Number: F603Y7A10AP
Main Control Board
PartSelect #: PS12680269
Manufacturer #: F603Y7A10AP
Circuit board
  No Longer Available
Lever – Part Number: F31374650AP
Lever
PartSelect #: PS12690546
Manufacturer #: F31374650AP
Lever
  No Longer Available
Open Lever – Part Number: F82565X00AP
Open Lever
PartSelect #: PS12676999
Manufacturer #: F82565X00AP
Door open lever
  No Longer Available
Door – Part Number: F301A8N40SAP
Door
PartSelect #: PS12677613
Manufacturer #: F301A8N40SAP
Door
  No Longer Available
Main Control Board – Part Number: F603Y5W00AP
Main Control Board
PartSelect #: PS12677664
Manufacturer #: F603Y5W00AP
Power control board
  No Longer Available
Door Switch – Part Number: QSWMA085WRE0
Door Switch
PartSelect #: PS12697446
Manufacturer #: QSWMA085WRE0
Microwave door switch, normally open two terminals.
  No Longer Available
Clip – Part Number: F90804W00AP
Clip
PartSelect #: PS12697836
Manufacturer #: F90804W00AP
Wave guide clip
  No Longer Available

Questions And Answers for NN-SN757S

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Common Symptoms of the NN-SN757S

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No heat
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Won’t turn on
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Doesn’t shut off
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Tray won’t turn
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Keep searches simple. Use keywords, e.g. "leaking", "pump", "broken" or "fit".
Broken door micro switch. (unit does not start heating)
Unplug the unit before servicing. Need phillips screwdriver. Open door. Use step ladder to access and remove 2 small screws from top of the room air diffuser at top of unit. Slide diffuser slightly to the left to align the diffuser's plastic tab on the left side to rotate toward you. (The wires for the front control panel are at the far left side of this difuser, but difuser is slotted for easy removal). Once the difuser is removed you will see 1 screw at the top that secures the pannel cover on the left side of the unit. Remove screw and slide this panel slightly up and out. This exposes the plastic frame that holds the upper and lower door switches. To locate the door switches and observe how they work, close and open the door and watch the door (bayonets) open and close the micro switches. Do the (red) buttons on top of the switches move up and down when the door bayonets push and release? If the buttons do not "pop" up when opened the switch is defective. The switch frame is secured with 2 screws. Remove screws and rotate the unit out for easy access to the micro switch(s). The internal (spring?) on my unit that is suposed to allow the red (visible) button on top of the switch to "pop" up when the door is opened was broken. Carefully pry the switch outward while being careful to lift the plastic holder-piece that holds the switch in place. Be careful, there is a small pin on the frame, so rotate the switch OUT toward you while lifting (carefully) the plastic holder-piece (you will see it on top of the switch). You can use an ohm meter to test the continuity of the switches. But if the buttons don't "pop" they are defective. Replace switch and reassemble.
Parts Used:
Micro Switch
  • JAMES from BILLINGS, MT
  • Difficulty Level:
    Very Easy
  • Total Repair Time:
    30 - 60 mins
  • Tools:
    Screw drivers
30 of 50 people found this instruction helpful.
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Burned out light.
The light burned out about 6 months ago and I thought it would be just a matter of screwing out a bulb and replacing it with one I bought from one of the local hardware stores. I looked inside and could see no way to remove a bulb. The owner's manual did not have any info on replacing the bulb, so I called Panasonic. After waiting on the phone for 30 minutes the woman said I had to take it to the closest authorized repair facility which happens to be 60 miles away. I called them and they told me that it would cost about $100, twice what I paid for it.
After hearing my wife wine about not having a light, I went to the Panasonic web-site, got the schematic, found the bulb and part number.
The fix was easy. You will need a #15 security Torx driver and a Phillips driver. Remove the Phillips from the side, then the Torx screws from the edges on the back. The case can then be removed much like removing the case on a computer. The case fits into slots which hold it in place.
The bulb is easy to spot and remove. Replace the bulb and reverse the procedure for taking apart the case. Total repair cost me $17. I already had the Torx driver.

$17 for a happy wife... Priceless.

Don't forget to unplug the microwave!!
Parts Used:
LAMP
  • Raymond from Palm Coast, FL
  • Difficulty Level:
    Easy
  • Total Repair Time:
    15 - 30 mins
  • Tools:
    Screw drivers
19 of 20 people found this instruction helpful.
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Door sensor switch went bad. Microwave would not operate.
Watched a couple of repair videos on Youtube by searching for the model number. Found out what to do in order not to get shocked by the powerful capacitor.
Ordered the two switches (To be sure, I could have ordered a third switch as suggested in the videos.)
Bought a tamper-proof star bit to get the cover off. Followed the directions to replace the switches. - I broke the harness and had to use some super glue, but it's all good. I should have removed the harness instead of trying to get a switch out while it was still in place.
It's all back together, and the wife is happy!!
Parts Used:
Micro Switch
  • Randall from ARCADIA, CA
  • Difficulty Level:
    A Bit Difficult
  • Total Repair Time:
    1- 2 hours
  • Tools:
    Pliers, Screw drivers
10 of 17 people found this instruction helpful.
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