B
Ben Myers
Nothing wrong with reinforcing what others have already stated. It's not like
the majority rules, but... Ben Myers
the majority rules, but... Ben Myers
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A
ato_zee
Nothing wrong with reinforcing what others have already stated. It's not
like the majority rules, but... Ben Myers
Replacing parts at random, without proper diagnosis, gets expensive.
Garages tend to do this as well, at prohibative charges.
With switchmodes going into spasm lift/break one rail at a time until
it doesn't spasm/shutdown. AFAIR the original post did not point
exclusively to the PSU. Just that it shut down during power up.
G
GanjaTron
[email protected] said:With switchmodes going into spasm lift/break one rail at a time until
it doesn't spasm/shutdown.
You mean actually *severing* paths on the PCB? Isn't that rather
drastic? :^)
AFAIR the original post did not point
exclusively to the PSU. Just that it shut down during power up.
It shuts down even w/o load (DC controller & motor unplugged) so
there's *gotta* be sumptin' wrong with it...
The two optocouplers (TLP634) were mentioned -- anyone got a pinout or
point me to a data sheet? Apparently they're not readily available for
download (at least where I looked). Thanks!
--GanjaTron
A
ato_zee
You mean actually *severing* paths on the PCB? Isn't that rather
drastic? :^)
Usually you can unsolder one connection, vith a spring loaded
piston type heated solder sucker, or unsolder the whole
rectifier for each rail. Then replace PSU and switch on, if it stays
up, you have found the overloaded rail. Check for low
resistance across that rail, do a bit of tracing to see if you
can split the rail further. You can cut tracks, it's knackered
anyway, so you have nothing to lose, then restore them with
a soldered bridging wire. But cutting tracks is a last resort.
J
John Knowles
Hi, I asked in another post for information on the DC power supply. I would
like to find a schematic. I tried ESI but can't get anywhere!
John Knowles
like to find a schematic. I tried ESI but can't get anywhere!
John Knowles
N
NSM
GanjaTron said:You mean actually *severing* paths on the PCB? Isn't that rather
drastic? :^)
Standard repair method.
A
ato_zee
Standard repair method.
The DC power supply feeds the rest of the printer,
lift the outputs, one by one, at the socket the PSU plugs into. If it's
an overload in one of the modules, it'll stop shutting down. The
PSU shutting down may only be a symptom of trouble elsewhere.
C
CJT
NSM said:Standard repair method.
Perhaps in some circles.
N
NSM
CJT said:NSM wrote:
Perhaps in some circles.
The circles competent repairmen travel in, yes.