[AMRadio] Tektronix repair

Jim Wilhite w5jo at brightok.net
Wed Nov 5 11:06:00 EST 2014

Hi John,

How is everything in the mountains?  I sure miss that climate.

This problem is a trace location problem.  The position knobs won't move 
them as they should and I am hoping against hope that it may be a simple 

I have reached the point that small, delicate connectors and such are a real 
problem.  That is why I am looking to see if anyone can fix it rather than 
myself.  To give you an idea as to how things are for me, I also have a 2230 
that I managed to blow the horizontal trace circuit.  I was working on 
something and dropped the probe which went into the HV buss and boom.  I do 
have a parts unit for that one but would rather have the 485 if possible.

My guess is both may be headed for the parts heap like me.



-----Original Message----- 

Hey Jim,
My experience is with a 7623 or one of the similar mainframes. Had a
problem but was a bear to get to. They didn't build those scopes for
easy take apart. Layers on top of layers of circuitry with tiny coax and
ribbon cables plugged into fragile connectors. I eventually gave up, and
scrapped it for parts. Long before, I took on a 465 that had an issue,
and found it was similarly tough to get down to the board level. I think
there were some ICs that were custom made, big things, for horizontal
deflection, etc. So when they failed, it was worthless.

Anyway, unlike the advice I saw in replies, I would not suggest trying
to repair one unless you have the original manual, plenty of time and
patience, and willing to give up when you cannot go any further.

Best of 73s
John Lyles
Santa Fe County, NM

> ------------------------------
> Message: 7
> Date: Mon, 3 Nov 2014 21:06:35 -0600
> From: "Jim Wilhite" <w5jo at brightok.net>
> To: "AM Radio List" <amradio at mailman.qth.net>
> Subject: Re: [AMRadio] Tektronix repair
> Message-ID: <703E562998224E15B7F3B79C254439CE at JimPC>
> Content-Type: text/plain; format=flowed; charset="UTF-8";
> reply-type=response
> Thanks for the suggestions guys.  But (a big word), the scope I have in 
> mind
> is a 485 and  I am sort of attached to it and have the cart for it.  I
> believe it is a 350 Mc scope and works fine other than the traces do not
> respond to the position control properly.  I really can't tell you why I
> want it fixed but just thought if I could find someone, I would do it.
> As for repairing things now a days, it is difficult Mike.  I have trouble
> keeping from burning wires in my Champion or King.  Not only that my eyes
> are not what they were even a year ago.  Believe me it is hell getting old
> but it is sort of fun, but not in cases like this.  I do have the manuals
> for it but have trouble with reading it.
> Tnx and 73 guys
> Jim
> W5JO
> -----Original Message-----
> Not to play pile on, but I have done repairs on many of Tektronix 
> equipment.
> If you have the service manual, then you are in shape to fix it yourself. 
> At
> least in my opinion, Tek manuals were the best in the business. I used to
> repair their old copiers, printers, plotters, scopes, digital terminals 
> etc.
> If I were you, I would take a shot at it myself.
> Mod-U-Lator,
> Mike(y)
> -----Original Message-----
> Unless you are a collector who wants a working vintage scope, the chances 
> of
> this being economical are slim and none. You can almost certainly go buy a
> good working scope for less than the repair cost of the ones you have. 
> It's
> a 2014 harsh reality.
> 73 de N3RHT
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