Weller EC2002 display goes out

J

Joerg

Guest
The Weller EC2002 is their solder station with a red 7-segment
display. Problem: After less than a minute the display goes dark
yet the temp remains stable. Seems like the chip in the station
is shot. Did anyone see this before and found a fix?

Regards, Joerg.
 
I read in sci.electronics.design that Joerg <notthisjoergsch@removethisp
acbell.net> wrote (in <4077111F.2E9DAEDD@removethispacbell.net>) about
'Weller EC2002 display goes out', on Fri, 9 Apr 2004:
The Weller EC2002 is their solder station with a red 7-segment
display. Problem: After less than a minute the display goes dark
yet the temp remains stable. Seems like the chip in the station
is shot. Did anyone see this before and found a fix?

It could be a problem with the power supply (dried up capacitors). Can
Click to expand...
you measure the supply voltage of the display circuit?
--
Regards, John Woodgate, OOO - Own Opinions Only.
The good news is that nothing is compulsory.
The bad news is that everything is prohibited.
http://www.jmwa.demon.co.uk Also see http://www.isce.org.uk
 
John, there is a stable 5V on the display and I can't see much telltale
ripple riding on any supply. Diagnosing a lot deeper is a challenge since
the circuitry is made up of two thick film hybrids wedged against each other
back to back. Thick may be a misnomer here as one is so thin that I am
afraid I could break it with a touch. The three 7-seg devices are driven by
one of those direct bond chips under a blob of tar.

Regards, Joerg.
 
Joerg <notthisjoergsch@removethispacbell.net> says...

Diagnosing a lot deeper is a challenge since
the circuitry is made up of two thick film hybrids wedged against each other
back to back. Thick may be a misnomer here as one is so thin that I am
afraid I could break it with a touch. The three 7-seg devices are driven by
one of those direct bond chips under a blob of tar.
Click to expand...
You need to order a EC236 display board, degrees F, 120v
http://www.google.com/search?q=Weller+EC2002+ec236&lr=&filter=0


--
Guy Macon, Electronics Engineer & Project Manager for hire.
Remember Doc Brown from the _Back to the Future_ movies? Do you
have an "impossible" engineering project that only someone like
Doc Brown can solve? My resume is at http://www.guymacon.com/
 
Yes, Guy, that would be the easiest way. They want almost $100 for that little
board. Ouch.

Guess I may have to bite that bullet or dust off an old non-display station, the
ones with just a potmeter and an LED. Somehow they don't die so often which is
probably due to their simplicity.

Regards, Joerg.
 
I read in sci.electronics.design that Joerg <notthisjoergsch@removethisp
acbell.net> wrote (in <40772A02.F2FC011A@removethispacbell.net>) about
'Weller EC2002 display goes out', on Fri, 9 Apr 2004:

John, there is a stable 5V on the display and I can't see much telltale
ripple riding on any supply. Diagnosing a lot deeper is a challenge since
the circuitry is made up of two thick film hybrids wedged against each other
back to back. Thick may be a misnomer here as one is so thin that I am
afraid I could break it with a touch. The three 7-seg devices are driven by
one of those direct bond chips under a blob of tar.

OK, it sounds as though even if you found the fault by some means, it
Click to expand...
wouldn't be repairable.
--
Regards, John Woodgate, OOO - Own Opinions Only.
The good news is that nothing is compulsory.
The bad news is that everything is prohibited.
http://www.jmwa.demon.co.uk Also see http://www.isce.org.uk
 
John Woodgate <jmw@jmwa.demon.contraspam.yuk> says...
I read in sci.electronics.design that Joerg <notthisjoergsch@removethisp
acbell.net> wrote (in <40772A02.F2FC011A@removethispacbell.net>) about
'Weller EC2002 display goes out', on Fri, 9 Apr 2004:

John, there is a stable 5V on the display and I can't see much telltale
ripple riding on any supply. Diagnosing a lot deeper is a challenge since
the circuitry is made up of two thick film hybrids wedged against each other
back to back. Thick may be a misnomer here as one is so thin that I am
afraid I could break it with a touch. The three 7-seg devices are driven by
one of those direct bond chips under a blob of tar.

OK, it sounds as though even if you found the fault by some means, it
wouldn't be repairable.
Click to expand...
There is always tho old last resort before throwing it away;
reseat any connections you see and reflow any solder joints
you see. This is unlikely to help, but it only takes a couple
of minutes to try.

....Assuming that this isn't your only soldering iron... <grin>


--
Guy Macon, Electronics Engineer & Project Manager for hire.
Remember Doc Brown from the _Back to the Future_ movies? Do you
have an "impossible" engineering project that only someone like
Doc Brown can solve? My resume is at http://www.guymacon.com/
 
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