[Test-Equipment] UPDATE ON: Does my 141T have a terminal illness?

[ma.locksmith at juno.com]

I just logged on to the BAMA mirror site.....  and, there's no 6552B
listed.....  but, if that's a type and it's 8552B, there are two files. 
One is DjVu format and about 5 Mb and the other is and Adobe file of 60
Mb.

I downloaded the DjVu file without problems....  can't do the other on
dial-up.....

Ed
K1ZOK

On Wed, 1 Aug 2007 14:52:12 -0400 "jeremy-ca" <km1h at jeremy.mv.com>
writes:
> Both fuses on the 6552B IF section are blown, they are for -10 and 
> -12.6V. 
> Replacing them gave the same results. The small power transistors 
> next to 
> them test OK. Thats as far as Ive got so far.
> 
> Im getting nowhere trying to dl a manual from BAMA or the edebris 
> mirror. 
> All dl's come up with 0 bytes. This happens on 2 different PC's
> 
> Any ideas before I dig in and make it worse?
> 
> Carl
> KM1H
> 
> ----- Original Message ----- 
> From: "Chris Trask" <christrask at earthlink.net>
> To: "Alan Melia" <alan.melia at btinternet.com>; 
> <test-equipment at mailman.qth.net>
> Sent: Tuesday, July 31, 2007 9:02 AM
> Subject: Re: [Test-Equipment] re: Does my 141T have a terminal 
> illness?
> 
> 
> >    There's one in particular on the board on the bottom side of 
> the
> > mainframe.  It's a 47.5K (I think) 1% 1/2W wirewound resistor 
> that's
> > actually dissipating over 0.6W.  I had one burn out and replaced 
> it with a
> > 47K 5% 1W.  It's been working fine ever since.  I seem to recall 
> that the
> > symptoms of the failure were similar to what you described.
> >
> >    I also had one blow out a 68V zener on that board when we had a 
> power
> > mains surge.  It was harder to find the zener than it was to 
> replace it.
> >
> > Chris
> >
> >     ,----------------------.       High Performance Mixers and
> >    /    What's all this     \    Amplifiers for RF Communications
> >   / extinct stuff, anyhow?  /
> >   \  _______,--------------'           Chris Trask / N7ZWY
> >  _ |/                                  Principal Engineer
> > oo\                                  Sonoran Radio Research
> > (__)\       _                             P.O. Box 25240
> >  \  \    .'  `.                     Tempe, Arizona 85285-5240
> >   \  \  /      \
> >    \  '"        \                 IEEE Senior Member #40274515
> >     .       (  ) \
> >      '-| )__| :.  \              Email: christrask at earthlink.net
> >        | |  | | \  '.       
> http://www.home.earthlink.net/~christrask
> >       c__; c__;  '-..'>.__
> >
> >                       Graphics by Loek Frederiks
> >
> > ----- Original Message -----
> > From: "Alan Melia" <alan.melia at btinternet.com>
> > To: <test-equipment at mailman.qth.net>
> > Sent: Tuesday, July 31, 2007 2:40 AM
> > Subject: [Test-Equipment] re: Does my 141T have a terminal 
> illness?
> >
> >
> >> Hi Carl dont panic too quickly  :-))
> >> The sweep is quite dependent on the correct psu voltages. The 141 
> frame
> > has
> >> a habit of cooking some of the resistors which drift high. You 
> will need 
> >> a
> >> 141T manual from one of the several free sites and then before 
> doing
> >> anything else check and re-adjust the 4 power rails to spec. They 
> must be
> >> done in the correct order, as in the manual. I suspect the -12v 
> rail as
> > this
> >> provides a reference for the schmidt that trips the sweep. I had 
> a 
> >> similar
> >> effect on one of my frames which would not sweep below 10ms.
> >>
> >> Good Luck with it
> >> Cheers de Alan G3NYK
> >>
> >>
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> >>
> >> --
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> 7/29/07
> > 11:14 PM
> >>
> >>
> >
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