Reply to "PS/2 3V Board Repair"

stan2004OGR Forum Member

I scoped a working board. When in reverse I get a 5V PWM signal on the 5630 gate; when in fwd the signal is low. This signal also appears at pin 7 of the 244 buffer. For a 244, the corresponding input is pin 13. That signal has a smaller 3V PWM signal so the 244 is boosting/buffering this to 5V pulses.

So if you have nothing on pin 13 when in reverse (and you know the processor "thinks" it's in reverse by the backup light or some other non-relay reverse indication), then it doesn't look good

I agree it's curious that you have 2 boards doing the same thing. Makes you wonder if there's someone out there who has an engine that ONLY needs to go in forward such as some kind of window display or whatever!

8/19/146:05 PM

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