(Topic ID: 272011)

bally display transistor replacement


By AJRACE

14 days ago



Topic Stats

  • 6 posts
  • 4 Pinsiders participating
  • Latest reply 11 days ago by AJRACE
  • Topic is favorited by 2 Pinsiders

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Bally_6-Digit_Display.jpg

#1 14 days ago

Trying to fix Bally 6 digit. Transistors are M 585 33 E8C (motorola) I believe this transistor is not made anymore. Digikey gives a couple of options but I am not sure they are electrically equivalent. Can anyone provide a cross reference number to a currently produced transistor please?
Thanks

#2 14 days ago

585-33 =
MPSA42 or KSP42

585-32 =
MPSA92 or KSP92 or 2N5401

Typing this the fourth time ... finally got it right

#3 14 days ago

The transistor types are listed in the schematics

MPSA42 and 2N5401 transistors are used depending on location.

Bally_6-Digit_Display.jpg

#4 14 days ago

Thank you so much Gentlemen. I will get these ordered and attempt to fix the displays. This information is greatly appreciated. Al

#5 14 days ago

If you cannot get it fixed I have fully reconditioned Bally/Stern 6 digit displays assemblies ready to go. $35 plus shipping.

#6 11 days ago

Thank you Scott, i may take you up on that offer. I ordered one from Pinball Medics in Ottawa. The display arrived with one segment missing. That is why we are troubleshooting. Mike at Pinball medics is sending another one. I have a couple displays that need repair. i figure the transistors and resistors are pretty cheap so I will try that first. Al

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