Tripp Lite PR60 power supply problem
klem kedidelhopper
burned diode, (looks like a 1N4000 series size) on the regulator
board.This diode was soldered accross C1 with the cathode connected to
the positive terminal of C1.This part looks like it must have been a
production change as all other parts are labled on the board but this
one the board is not labled for it and so it looks like it was a
factory modification. Tripp Lite won't help me at all with this
problem. So I was hoping that someone might have run into this before
who might have any information on this and/or perhaps a schematic that
they could share. Thanks for any help. Lenny
Meat Plow
What happens when you replace the diode?
--
Live Fast, Die Young and Leave a Pretty Corpse
klem kedidelhopper
WelI I haven't replaced it as of yet because I don't know if it was
just a diode or a zener. And not knowing this and what else might be
wrong I wouldn't want to compound the problem. Lenny
Meat Plow
If it's a zener it would be clamping voltage on a reg circuit. Not
knowing what C1 is or does it's hard to say what its function is but
I would take an educated guess and say it's not a zener. I suppose you'll
need to figure out how C1 plays into the circuit. Personally I would ramp
the source up using a variac and watch what kind of voltage developed
where the cathode should be and take into consideration C1's rated
voltage and maybe develop a schematic in my head.
klem kedidelhopper
>
> - Show quoted text -
Yeah I don't think that its a zener either. Its just that with the
cathode on + it doesn't seem like it could be forward biased so what
is it doing there? I haven't tried to draw it out but this otherwise
appears to be a straight forward 723 based linear regulator circuit.
The way this thing is built though its virtually impossible to reverse
engineer it. I do like your idea of using the variac for testing. I
have a small variac but with a small load on the PR60 ouput I don't
think it should be much of a problem. It pisses me off how
uncooperative most of these manufacturers have gotten in the past few
years. Back in the 60's when I started in electronics you could get
anything from most anyone. Today you would think I was asking for
state secrets.This is an obsolete model. What the hell difference
would it make to give me a schematic? Not like I'm going to try to
mass produce these things. I would just like to get it going for
myself. Lenny
Meat Plow
Years ago I bought a used Nady 201 that I wanted to switch channels.
Requiredan xtal change and some tweaking of the RF circuits for both the
xmitter and rxcvr. I finally got someone to talk to me at Nady. Even sent
me some schematics. I called back maybe 2 weeks later and that person was
no longer employed there. Seems at least back then it would take a
Wikileak to get any info from Nady. This guy probably got the boot for
giving me some tech literature. And Nady wanted back in around 1992 $69
+S/H to re-channel the 201. I had the info on the xtal parameters and
sent the data to Jan xtal. They made a new set of xtals for $14.99. Took
me 5 minutes to align. Still have the units.
Your diode might suppress some kind of transients in that config. May
help C1 live longer, hard to tell.
Nancy Norelli
> What happens when you replace the diode?
My clit flicks.
--
Don't FUCK with me. I'm tuff. And stupid but don't dare FUCK with me.
Akin Bohner
> On Wed, 1 Dec 2010 20:11:33 +0000 (UTC), Meat Plow wrote:
>
>> What happens when you replace the diode?
>
> My clit flicks.
That's a horrific thought.
klem kedidelhopper
Maybee I'll replacethe diode with a 1N4004 lets say and plan on
possibly doingthe 723 as well. There are no shorted transistors on the
output so I guess we'll see. It can always go to the metal pile if
need be. Lenny
Wild_Bill
website (in 2005)
http://www.cbtricks.com/
I don't see the schematic listed, but an email to someone at CB Tricks may
be worthwhile.
Otherwise, a voltage regulator circuit isn't extremely complicated, and many
examples can be found in the ARRL Handbooks (library) or various online
plans.
--
Cheers,
WB
.............
"klem kedidelhopper" <captainvi...@gmail.com> wrote in message
news:4723da43-6efe-45b4...@r31g2000prg.googlegroups.com...
tm
news:cNCJo.207847$zE6....@en-nntp-03.dc1.easynews.com...
>I saw a reference to the T-L PR-60 PSU schematic being available at this
>website (in 2005)
> http://www.cbtricks.com/
>
>
Is there a crowbar scr in there? It could be a zener used as an overvoltage
protector.
tm
klem kedidelhopper
> I saw a reference to the T-L PR-60 PSU schematic being available at this
>
> I don't see the schematic listed, but an email to someone at CB Tricks may
> be worthwhile.
>
> Otherwise, a voltage regulator circuit isn't extremely complicated, and many
> examples can be found in the ARRL Handbooks (library) or various online
> plans.
>
> --
> Cheers,
> WB
> .............
>
>
> news:4723da43-6efe-45b4...@r31g2000prg.googlegroups.com...
>
>
>
> > Someone gave me one of these that he says smoked. I found a small
> > burned diode, (looks like a 1N4000 series size) on the regulator
> > board.This diode was soldered accross C1 with the cathode connected to
> > the positive terminal of C1.This part looks like it must have been a
> > production change as all other parts are labled on the board but this
> > one the board is not labled for it and so it looks like it was a
> > factory modification. Tripp Lite won't help me at all with this
> > problem. So I was hoping that someone might have run into this before
> > who might have any information on this and/or perhaps a schematic that
>
> - Show quoted text -
I tried to register on their site but it was an excercise in
frustration. How would I contact anyone there?
Lenny
JW
<captainvi...@gmail.com> wrote in Message id:
<391adb92-6aa5-4951...@j21g2000vba.googlegroups.com>:
>Yeah I don't think that its a zener either. Its just that with the
>cathode on + it doesn't seem like it could be forward biased so what
>is it doing there?
Reverse voltage protection for the cap?