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

[jeremy-ca]

I meant 8552B.

Ive disabled Zone Alarm and no change, it might be Spyware Blaster, Spybot, 
AdAware, XoftSpy or Windows Defender; they are all running but they dont 
bother anything else I do.

Carl
KM1H




----- Original Message ----- 
From: <ma.locksmith at juno.com>
To: <km1h at jeremy.mv.com>
Cc: <test-equipment at mailman.qth.net>
Sent: Wednesday, August 01, 2007 6:22 PM
Subject: Re: [Test-Equipment] UPDATE ON: Does my 141T have a terminal 
illness?


>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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>> >>
>> >>
>> >> --
>> >> No virus found in this incoming message.
>> >> Checked by AVG Free Edition.
>> >> Version: 7.5.476 / Virus Database: 269.10.25/926 - Release Date:
>> 7/29/07
>> > 11:14 PM
>> >>
>> >>
>> >
>> > ______________________________________________________________
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>> >
>>
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