To no avail, the following items have been changed: all input cards, all output cards, both backplanes, power supply card, power supply, relay board, timer board, SRB, the board next to the SRB (can’t recall the name), door operator board, cable from operator to detector edge, limits in door operator, hoistway switches and traveling cable wires have been swapped around.
This issue may occur one in a week or remain failed for several days in a row.
I’ve finally got my hands on a tool and the car is currently failing.
Moving the run/debug jumper on the SRB yields no action in the debug menu.
Does anyone have any diagnostic information they can share?
I poked around the tool a bit today and spoke with Cetek. We found that my ALU software input was toggling high and low. Also, I cannot get my NVRAM to initialize.
I ran an input test and it looks like the first slot on my backplane is bad. I’ll post my findings once I get my hands on some parts.
Was also able, with assistance from Cetek, to initialize the non volatile ram.
Car ran without fail for an hour or so and then ALU started getting flakey again and my issue returned.
New I/O interface card is next.
Replaced second input card and issue cleared immediately, which it sometimes would with a power cycle.
Re-installed second bad input card and issue was clear, ran car non-stop and issue returned after about 30 minutes.
Re-installed new input card and ran two hours, no more failures. Time will tell if this thing is fixed.
Door open, door close and detector input wires have been lifted while failing and issue remained.
The signal is only viewable from the tool, it is not a discrete signal.
Not sure if that's relevant though, I think it's only used for group controllers.
When you replaced the backboards did you reuse the little voltage regulators that are mounted on the side of the metal cage and wired to the boards? If so, did you confirm you have a clean 14vdc coming out of them. There should be 2 capacitors on the right side of the cardrack you can measure the voltage across fairly easily. Also, flip to AC and see if there's any AC coming through.
Those can go bad and cause all sorts of input issues. Usually the card leds will stay on or off and it will be a row or entire card but I wouldn't be surprised if it could cause this issue.