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I just finished up my latest test-set, one for the MTH PS2 (3V & 5V boards) and the PS32 boards.  This replaces all the functionality of the original factory PS/2 Manual Test Fixture in a compact package.  The test set uses the same cable set as the original factory model, but replaces all the physical elements like the smoke unit, couplers, etc. with electronic equivalents.  The one mechanical item that was retained is the motor and tach reader, hard to simulate those with resistors and diodes.  For space considerations, an HO motor was used as the size isn't significant for the test set.  The batteries are simulated by supercaps for a permanent replacement of that function.  The test set PCB sits on a platform to clear the lower side components.  I also included niceties like a pilot light and a PTC programmable fuse to protect against over-current if a bad board is connected.

<click graphics to expand>

Top View of Test Panel

A New MTH PS2-PS32 Test Set N1

Bottom View of Test Panel With Platform

A New MTH PS2-PS32 Test Set N2

Test Set In Operation with a PS32 Board

A New MTH PS2-PS32 Test Set N3

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  • A New MTH PS2-PS32 Test Set N1
  • A New MTH PS2-PS32 Test Set N2
  • A New MTH PS2-PS32 Test Set N3
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@TheRambles posted:

@gunrunnerjohn Hey John, Looks awesome. Can't wait to see it in action.

I think I understand what the test set does. I don't get why it's useful. Say you identify that a PS3 board is not sending power to the Smoke unit motor, there isn't really a way to repair it, right?

Is it just about diagnosing what has failed so you know for use in other projects?

Well, first off, this is for the PS/2 boards and the PS32 board used in PS/3 steam upgrades and as a replacement for PS/2 boards if they fail.

You can do a lot with the test-set, one thing is to verify new boards you're going to install and also load their sound and/or chain files in a test environment.  If you have a failing PS/2 board, say a run-away, it can be the tach reader, wiring, or the board.  A quick test with your test-set and you'll know if it's the board.  Then you know how to proceed.

There's actually a lot of stuff on the PS/2 boards that we can repair, especially the newer 3V boards.  There are also parts on the PS/3 boards that we can replace, though not as many as the PS/2 types.

Obviously, this is most useful for someone that handles lots of repairs/upgrades and thus is more likely to run across lots of questionable or bad boards and want to test/repair them.

I did a test run with hot glue to add the reinforcement for the UUT (Unit Under Test) side of the cables, it worked out pretty well.  It does make them easier to insert/remove, and also minimizes the possibility of yanking a wire out of the connector.  I don't see the need for this treatment on the test box side of the cables as you would normally stick the two cable sets in and leave them connected to the test box.

___Test Set Cable Fix

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  • ___Test Set Cable Fix
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