(Topic ID: 195152)

NGG Power Problem


By pinwhiz

2 years ago



Topic Stats

  • 2 posts
  • 2 Pinsiders participating
  • Latest reply 2 years ago by jimy_speedt
  • Topic is favorited by 1 Pinsider

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#1 2 years ago

Am working on a No Good Gofer that is resetting when game is being played. 5v is not constant. Sometimes it's at 5.35 sometimes it's 5.0 and even 5.55. When it reset I checked 5v and it's normal at 5.1v but climbs steadily to 5.4-5.5. Changed the 5v regulator, cap and D7-D10 bridge diodes, resoldered grounds etc. Same issue. Disconnected 5v outputs, 5v still high. Installed another power driver board, same issue. Checked transformer jumper plug for correct jumpers and reseated 5v transformer plugs, and checked 5vac pins at J129-1,2 for shorts and continuity. My next step would be to swap out the transformer unless I'm missing something. Hopefully someone on the forum has encountered this problem. Open to suggestions. Thanks!

#2 2 years ago

Hi,

Have you checked the AC voltages on the transformer lugs ? From which point do you record Voltage variations? Is your 5 vdc unstable from the begining, i.e. after being rectified ? Is the ac voltage good or do you record variations there as well ?

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