"Sam Goldwasser" wrote in message
...
"Wayne Tiffany" writes:

Our church has one of these printers that has worked well for a long
time.
It now doesn't.

Upon turning on the power, it appears to go through the power up testing,
but then when trying to move the head, it powers down. I have checked
and
watched the power supply and I suspect that it's being told to turn off.
I
checked ESR on all the electrolytics, and all appear to be fine. I can
move
the head to the middle, and upon powering up, it will take it home, but
then
shut down once it gets there. I measured about 5v across the head motor,
so
I pulled it out and put 5v to it. It does run, but not very smoothly,
and
sometimes doesn't want to start very well. I don't know if this motor
has
brushes or not, but it feels like maybe the motor is struggling, thereby
shutting down the power supply. If I unhook that motor plug, upon power
up,
the printer flashes an error.

Any more thoughts here? Maybe something I missed?

Even I would say it's possibly time to retire it.

I've found bad solder connections in the power supply of one of those.

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I thought about the solder and so checked all joints under the microscope -
all looked good. I really think the controller is telling it to shut down
since it is so repeatable. I can watch the voltage shut off when the head
reaches the home position.

WT



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