Tektronix 4014-1 troubleshooting advice

[Simon Claessen]

we have a working 4002a in our museum and I always let it warm up with a 
completely illuminated screen for a minute or 5 before clearing the tube 
for the first time. that seems to do the trick.

On 27-03-15 06:03, Josh Dersch wrote:
> Hi all --
>
> Picked up a Tektronix 4014-1 terminal.  It's in pretty good shape, nice
> and clean and it's in nearly-working condition except that the storage
> behavior isn't quite right.
>
> On power-up, write-through doesn't.  (That is, characters don't get
> stored to the tube.)  Clearing the display via the RESET/PAGE key clears
> a roughly elliptical region in the center of the display but leaves the
> outer edges a mess.  The cleared region stores characters properly.  You
> can see the overall effect here:
>
> http://yahozna.dyndns.org/scratch/tek4014/clear.jpg
>
> After a 2-3 minutes of warming up the area cleared by RESET/PAGE
> increases.  I haven't run the terminal long enough to see if it
> eventually completely erases the screen (while the power supply appears
> to be within tolerances, I still need to rebuild/reform it so I'm not
> going to run it too long yet).
>
> So far everything else seems to be functioning properly, the cursor
> appears properly (and does not write through), input is accepted from
> the keyboard, etc. I've been reading through the service manual on
> Bitsavers and it describes a very in-depth alignment procedure which I'm
> prepared to go through (once I've got the power supplies rebuilt) but I
> thought I'd ask here if this problem rings any bells and if there's
> anything I should immediately suspect or adjust.  You guys know
> everything :).
>
> Thanks as always for the advice,
> Josh
>
>

-- 
Met vriendelijke Groet,

Simon Claessen
drukknop.nl