[GreenKeys] OT: Need help to T-Shoot this Tek 485 scope

Wed May 10 20:35:01 EDT 2017

@Bruce

Hey, thanks for those photos - I hadn't come across those. But it's as I
surmised, A15 is the one buried down in the midst of it all.. ugh. Not like
it's all that easy to t-shoot it when active.. if that's even possible!

Thing is, I still cannot find any illustration of it in the manual. No
pictorials, no schematics, no graphics, nothing.. only partial schematics
spread across several different drawings. This is really confounding, as
the manual is so thorough. And even if it +is+ fully documented, I'm unable
to determine this from the docs, and there's no procedure to R&R the module
- which is very surprising.

Anyway, I'm going to try removing A15. We'll see what that yields, and I'll
report back in short order. Thanks again, to all of you for your support.

(BTW - Just WTF Did Tek use primarily pozidriv screws, yet also used
phillips in some areas?!)

On Wed, May 10, 2017 at 7:21 PM, Nick <creativegardening at hotmail.com> wrote:

> I totally agree and that's what I am doing. But it is not easy sometimes
> to find your way through the Internet jungle. You can't see the forest
> because of too many trees around.
>
> Rookies also face another challenge  - elmers are not elmers anymore like
> in the old days. I  consider myself very lucky to have one of the best
> living right around the corner from my location.
>
> And then you have the miserable guys who are jealous sometimes of the
> rookies enthusiasm and accomplishments.
>
> Trust me, I speak from experience!
>
> Nick  -  N0NCQ
>
>
>
> Sent from my T-Mobile 4G LTE Device
>
>
> -------- Original message --------
> From: Paul Heller <paul0926 at comcast.net>
> Date: 5/10/17 5:51 PM (GMT-05:00)
> To: Nick <creativegardening at hotmail.com>
> Cc: GreenKeys at mailman.qth.net
> Subject: Re: [GreenKeys] OT: Need help to T-Shoot this Tek 485 scope
>
> I'm not against what is being proposed, but we are seeing a sudden influx
> of repeat questions, some as recent as a few months ago (sprocket feed
> paper). I would prefer people do some research first before asking
> redundant topics.  The footer of every Greenkeys message has links to
> archives.
>
> Paul
>
> On May 10, 2017, at 3:06 PM, Nick <creativegardening at hotmail.com> wrote:
>
> I am the rookie here and have to agree with Ray. There are so many things
> I like to learn but I am afraid to flood this room with rookie questions.
> So, I wait until the material pops up.
>
> On the other hand, not every subject is everybody's subject - so, what do
> you do? What is right and what is wrong? Do you flood or do you play
> conservative with your posts?
> I don't know the answer.
>
> Nick  -  N0NCQ
>
>
>
> Sent from my T-Mobile 4G LTE Device
>
>
> -------- Original message --------
> From: Raymond Cote <bluegrassdakine at hotmail.com>
> Date: 5/10/17 1:40 PM (GMT-05:00)
> To: Gil Smith <gil at baudot.net>
> Cc: Green Keys <GreenKeys at mailman.qth.net>
> Subject: Re: [GreenKeys] OT: Need help to T-Shoot this Tek 485 scope
>
> Replies ON LIST would be preferred. I suspect we would all prefer to learn
> by other technicians methods. Replying only to the originator does not help
> the trst of us learn.
> There have been many messages that i have been interested in learning
> about only to see a message that states "thanks for the help in solving my
> problem".
>
> Please, OM's. Consider sharing you methods of tracking and applying your
> fixes with the rest if us. Many if us are hoarders (collectors) and have a
> plethora if gear that trouble shooting practices of one item would apply to
> other gear
>
> Thanks fir reading and joining this method if teaching us
>
> Bench technician for 50plus years and have a commercial radio phone snd
> general ham ticket. Every time i open up something to investigate its
> innards, i still learn  something new.
>
> Ray Côté
> KD9CCZ
>
> Sent using Jedi Mind Trick!!
> By
> Raymond Côté
> KD9CCZ
>
> On May 9, 2017, at 00:58, Gil Smith <gil at baudot.net> wrote:
>
> I found a wealth of info on tek scope repair on a yahoo group:
> https://groups.yahoo.com/neo/groups/TekScopes/info
>
> Yahoo groups is a pain, but that is where they are.  I found lots of folks
> to help when I wanted to re-cap my trusty 300 MHz 2465 and 150 Mhz 2445.  I
> started with the 2445.  I replaced all of the caps with new/better spec
> units.  When I got it back together, the trace had some jittering that was
> not there originally.  F-me.  Also, the power switch was now stuck in the
> on position, so I need to plug the power cord in to turn it on.  Very
> disappointing outcome for a couple of days of work, plus parts cost.  I am
> really pretty careful/anal and not generally a hack, but I guess I missed
> something.  I bought a replacement power switch for the 2445, but I really
> have no interest in spending hours to do the R&R.
>
> As for my prized 300 MHz 2465, I now have no interest in screwing with it,
> as it still works perfectly.  It has great resolution for seeing things
> like undershoot, which my DSOs cannot resolve.  If it craps out some day, I
> will re-visit the re-cap (I have the bag of parts), but my original plan to
> re-cap is on hold unless needed.
>
> fyi, gil
>
>
> gil smith, AF7EZ
> greenkeys moderator
> gil at baudot.net
>
>
>
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