Reply to "MTH Amtrak PS1 won't run"

Jon GOGR Forum Member SUPPORTING MEMBER

The deselect was a feature QSI had that allowed you to park an engine and allow it to idle in neutral, so it would be immune any commands to make it switch to forward and reverse. There were a lot of commands available with the QSI system that MTH did not elect to use and they were removed from the processor memory. However, the early MTH PS1 chips were programmed with the deselect feature, but the board didn't have the software to support it and it could be inadvertently locked in the deselect mode. Trying to do a reset 18 (or any other reset) resulted in only getting one "clink" and the loco would be stuck in neutral. Not really sure what triggered the deselect mode in the PS1 locos, but a dead/low battery with operators pressing multiple buttons and working the throttle didn't help. The replacement chips have the deselect feature removed from the code and chips are still available from MTH.

11/27/2210:53 AM

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