Re: Tektronix Manuals - ORIGINALS
From: Jim Yanik (jyanik_at_abuse.gov.)
Date: 12/07/04
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Date: 7 Dec 2004 17:50:39 GMT
"Ed Price" <edprice@cox.net> wrote in
news:UZctd.21559$KO5.20719@fed1read02:
>
> "TekMan" <and7@bigfoot.com> wrote in message
> news:6a624601.0412060021.67e547d9@posting.google.com...
>> Jim Yanik <jyanik@abuse.gov.> wrote in message
>> news:<Xns95B36D61B2CAAjyanikkuanet@129.250.170.86>...
>>> cbarn24050@aol.com (CBarn24050) wrote in
>>> news:20041202032944.07763.00001557@mb-m01.aol.com:
>>>
>>> >>Subject: Re: Tektronix Manuals - ORIGINALS
>>> >>From: Jim Yanik jyanik@abuse.gov.
>>> >>Date: 30/11/2004 01:22 GMT Standard Time
>>> >>Message-id: <Xns95B0CF1756F1jyanikkuanet@129.250.170.83>
>>> >>
>>>
>>> >>>
>>> >>> Do you have schematic diagram for
>>> >>> Tektronix TDS3000 ?
>>> >>>
>>> >
>>> > I you had one it would be of limited use to you, full of custom
>>> > Tek parts very hard to fault find. Even Tek don't try to fix pcbs
>>> > anymore.
>>>
>>> TEK sold off their IC/hybrid manufacturing plant years ago.The only
>>> custom
>>> parts now would be programmed ICs.
>>>
>>> >
>>> >>The *entire* TDS line was intended for repair ONLY by module
>>> >>exchange or return to a TEK service center. They do not want
>>> >>customers repairing them themselves.
>>> >
>>> > Actually Tek are usually quite free with their scematics they
>>> > don't seem to care if you want to fix them yourself.
>>> >
>>>
>>> Show me one person who's gotten a TDS-scope schematic from TEK upon
>>> request.
>>>
>>> BTW,I worked for TEK for 21.5 years as a T&M service tech in
>>> Indianapolis and Orlando.I'm familiar with TEK policy up to 1998.
>>
>> Agreed. The so called "Service Manulas" for TDS3000 and TDS5000 I
>> could loacate in ebay will only go down to module level. But no
>> schematics -- so you are lost in most cases when tryinfg to find a
>> fault.
>>
>>
>> hth,
>> Andreas
>
> If you actually attempt to repair a module, you will find them
> generally unfriendly to signal tracing and probing. The width and
> spacing of traces and component pins begins to defy a human's ability
> to position a probe. Multi-layer boards make tracing near impossible,
> and you will encounter many proprietary parts that just aren't
> available at Radio Shack!
>
> The ultimate barrier is when you find the analog signal gets
> digitized, and all you have are data & control busses and an
> intimidating proprietary ROM chip & microprocessor.
>
> Newer equipment is simply manufactured with a different philosophy;
> you ensure the quality of the product with good components and tight
> process control. You don't spend any money fixing anything; you fix
> the process and build some more. Since you don't plan on fixing any
> hardware, you can design it without test points, and with a permanent
> assembly concept (if you don't plan to service it, you don't need to
> make any part of it accessible to anyone).
>
> Actually, this is not a new concept. For example, who hasn't repaired
> some gadget by finding a bad coupling capacitor? What did you do, cut
> open the capacitor and try to fix the windings? Of course not, you
> just grabbed a new 25-cent part and replaced the bad one. It wasn't
> cost-effective to wind your own capacitors (and I'm not even going
> near suggesting you try building your own solver-mica caps), and even
> if you did, you likely wouldn't make as good or reliable a cap as a
> commercial component.
>
> This same compelling economic reasoning has now driven the replaceable
> "component" up to the "board" or "module" level.
>
> Oh sure, I'm going to get some replies about how easy it is to fix SMT
> stuff. But I sometimes have to do just that, and I don't find it very
> enjoyable having to use a stereo microscope to see where to point
> micropositioner probes onto a gadget that looks like the tax code
> engraved on the head of a pin. I guess I'm find it more rewarding to
> be able to fix stuff that still needs 1/4 watt resistors with axial
> leads.
>
> Ed
> wb6wsn
>
>
TEK repairs the *current* and LTPS TDS exchange assemblies(if serviceable)
at Beaverton,and they were planning to do it at the DC field office in
Maryland.(6 yrs ago).
The only modules that did not get repaired were the purchased power
supplies.
LTPS = Long Term Product Support,TEK's list of what's still serviced.
-- Jim Yanik jyanik-at-kua.net
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