(Topic ID: 232596)

System 1 Buck Rogers lights stay lit

By ElCid95

3 years ago

Topic Stats

  • 5 posts
  • 2 Pinsiders participating
  • Latest reply 3 years ago by ElCid95
  • No one calls this topic a favorite


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#1 3 years ago

I recently bought a Buck Rogers with a Ni-Wumpf version E board in it and recently several of the playfield lights stay lit even when a game is not being played. Right now, both of the B's, 1,000, 5,000, 9,000, 5x and the 1 and 5 base bonus are always lit. The game will advance the bonus lights from 1,000 to 2,000 and so forth. Also if I hit U, C or K, they will turn off like normal. The problem comes back even when I turn the game off and back on. Any ideas what is causing this?

#2 3 years ago

I turned on the game this morning and the lights are back to normal. Hope this problem doesn't happen again...

#3 3 years ago

I spoke too soon. I turned on the game again and the problem came back. I've reseated the J3 cable on the A3 Master Driver Board, but that didn't help...

#4 3 years ago


Do you have a schematic? It looks like you probably have 2 groups of 4 lamps that don't work. I would think it is connector related (everything with my Count-down seemed to be connector related) and would "safely wiggle" some of the suspect wires. From the pinrepair site

"Four Lamps Don't Work.
From the table above you can see that any 74175 chip on the driver board controls four lamps. It's easy to suspect one of the 74175 chips as bad, but that's usually not the case in my experience. A far bigger thing to suspect is the connector coming from the bottom edge of the CPU board to the top edge of the driver board. Battery corrosion and age often takes its toll on these connectors, and the lamp signal gets lost from from the CPU board's spider chip to the 74175 driver board chip. Also on the CPU board the z24 or z25 (7404) inverter chip likes to die too."

You can get a new Driver board to MPU connector on eBay (or re-pin yours). I did and most of my problems went away after that. My game (Count-down) would behave great and then do something weird like this.

1 week later
#5 3 years ago

Turned out it was the cable between the control board and the master driver board. I unplugged it and plugged it back in.

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