(Topic ID: 306388)

Buck Rogers Vari-target issues

By Izzydorio

2 years ago

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  • 2 posts
  • 1 Pinsider participating
  • Latest reply 2 years ago by Izzydorio
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varitarget (resized).jpg
switchmatrix (resized).png
tip (resized).png
#1 2 years ago

My Buck Rogers machine (that I acquired recently) has a vari-target. Depending on the position of the vari target (base, 1-2-3-4-5-return to base), different points are awarded. The current position of the vari target is of course "visible", but also shown throught a series of lights (see attached picture). The light bulbs are just fine, when I put the machine in "lamp test" mode, they all work.

varitarget (resized).jpgvaritarget (resized).jpg

During a game, only positions base, 1-2 and "return to base" light up. So something's wrong with 3-4-5.

I checked the vari-target connections below the plafield using the multimeter diode mode, and after some cleaning they all consistently show connectivity between "in" and "out" connectivity (through the fingers of the vari-target).

Reading the switch matrix, the "test button" and "vari target rollover" on the same strobes all consistenly work, but not the vari-target 3-4-5.

switchmatrix (resized).pngswitchmatrix (resized).png

There is a transistor involved (TIP-115) but not specifically for the 3-4-5 I think, and my DMM measurements seems to indicate it's working..

tip (resized).pngtip (resized).png

It seems the CPU is not receiving the events from the vari target, but why?

Any ideas?

1 week later
#2 2 years ago

It seems it is an issue with the CPU board, specifically for my Buck Rogers (I have one of those fancy all-in-one boards from flippp.fr).
I contacted them, the issue/bug was already fixed, but I have an older revision so I need to send my board back and they will upgrade it on their expense.

Great customer support!

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