HP-2575 power problem

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inkjet101

I have an HP-2575 printer that won't power up. When the power plug is
connected to the printer, the power supply shuts down, which is
indicated by the green light going out. To restore the light I have to
unplug the power supply from the printer, then unplug the AC cord of the
power supply from the wall outlet and plug it in again. As soon as I
reconnect the power supply to the printer the green light goes out
again. I've tried a power supply from another 2575 but the same thing
happens. Apparently the printer is overloading the power supply causing
it to shut down. What is the most likely cause of this problem?

Thanks
 
inkjet101 said:
I have an HP-2575 printer that won't power up. When the power plug is
connected to the printer, the power supply shuts down, which is
indicated by the green light going out. To restore the light I have to
unplug the power supply from the printer, then unplug the AC cord of the
power supply from the wall outlet and plug it in again. As soon as I
reconnect the power supply to the printer the green light goes out
again. I've tried a power supply from another 2575 but the same thing
happens. Apparently the printer is overloading the power supply causing
it to shut down. What is the most likely cause of this problem?

Thanks
Click to expand...

Sorry for the repost but I would really appreciate some input on this
problem. Maybe some of you tech people might have a few suggestions. I'd
like to avoid buying a new printer but I doubt it's worth having it
repaired either. I do have some electronics experience but I'm not up on
printers. The problem is definately the printer, not the power supply,
as indicated in my first post. Since the power supply is DC, I assume
there are no rectifer diodes or filter capacitors on the printer's power
input circuit board. In that case, what componants are most likely to
cause an excessive current drain for the power supply when they fail?

Thanks again
 
inkjet101 said:
Sorry for the repost but I would really appreciate some input on this
problem. Maybe some of you tech people might have a few suggestions. I'd
like to avoid buying a new printer but I doubt it's worth having it
repaired either. I do have some electronics experience but I'm not up on
printers. The problem is definately the printer, not the power supply,
as indicated in my first post. Since the power supply is DC, I assume
there are no rectifer diodes or filter capacitors on the printer's power
input circuit board. In that case, what componants are most likely to
cause an excessive current drain for the power supply when they fail?

Thanks again
Click to expand...
Assuming you can get into the printer you need to look at the components
on the circuit board that are connected across the power supply. You
might be lucky and find an obviously fried part, but you probably will
have to do a bit of detective work. I would look for an electrolytic
capacitor as the first choice. Even with an external psu there may well
be a reservoir cap or two. After that perhaps voltage regulators, then
anything.
Good Luck
 
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