somewhat sad tek4015-1

Jacob Ritorto jacob.ritorto at
Sun Jan 25 14:25:38 CST 2015

Nope.  From the conversations I remember on here months ago, there was some
lengthy debate as to whether the whole concept of reforming caps was a
farce and that trying to do so was, perhaps, more dangerous than just
turning the thing on.  I tried to look at archives for details on how to do
it, but it seems they're not up currently.

On that note, maybe this is good fodder for the wiki discussion that was
going on last week.  If I could've made a more informed decision and
possibly saved my rare machine by having that information readily
accessible, that would've been a good thing.

So anyway, I found a really nice manual online for the tek.  I'm too much
of an amateur to just dig in and start analysing it myself.  Anyone have
suggestions on what to look for and where to start?  Should I put together
a simple PC parallel port logic analyser?


On Sun, Jan 25, 2015 at 4:37 AM, Simon Claessen <simski at> wrote:

> caps checked and formed before turning on? don't think so... :-(
> On 24-01-15 07:40, Jacob Ritorto wrote:
>> Hi,
>>    I pulled my tek4015-1 from storage (~10 years, dry but cold, had been
>> working perfectly then) and brought it home to my living room, much to the
>> dismay of my significant other.  I plugged it in.  it squealed a bit,
>> zapped a little and lit up with that signature green expanding circle.  I
>> was able to get the line/local light to behave reasonably and it seemed to
>> go into local mode ok.  Was hoping to echo characters to the screen, but
>> no
>> love.
>>    The screen is really bright.  It's as if the whole thing was in the
>> lit-up state.  PAGE key does blink the screen, but I remember it flashing
>> brightly whilst erasing in the past.  Now it looks like it's just staying
>> bright all the time.  I wiggled the boards in the cage around and managed
>> to get it to repeat control-g feeps (while holding those keys down), but
>> it's only able to do it intermittently, seems related to the positioning
>> (or complete absence) of the display driver board. Still no characters
>> showing up.
>> Does anyone know how to work on these?
>> thx
>> jake
> --
> Met vriendelijke Groet,
> Simon Claessen

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