(Topic ID: 349351)

Rottendog MPU327-3 MPU what is IC17?

By Robotworkshop

10 months ago



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#1 10 months ago

I am working on a spare Rottendog MPU327-3 combo board that I recently got with a group of boards. Unfortunately IC17 was missing. I can't find any reference photos of schematics for this specific version of the board. It is a 14-pin IC that I think may be a 7406. If you happen to have a game with this revision board could you take a look to confirm the chip number in IC17? The schematics for the MPU327-4 are different. Also the earlier MPU327-1 used an odd 74HCT9114 chip at IC17 which is a different board too. Not too much that I can find on this -3 revision. Would like to finish repairing it as a backup or as a loaner when I do repairs for others.

The only picture I found of the board online was for an old ad:

https://pinside.com/pinball/market/classifieds/archive/66879

1 week later
#2 9 months ago

I have a mpu327 (no revision number) that uses a 74HCT244 chip in IC17

IMG_0630 (resized).jpegIMG_0630 (resized).jpeg
#3 9 months ago
Quoted from TIB:

I have a mpu327 (no revision number) that uses a 74HCT244 chip in IC17
[quoted image]

Thanks for the response. That may be an earlier version of the board. I was able to follow the traces on the board and it matched the footprint of the 7406 so I installed one and that portion of the board seems to be working now.

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