3 Jul
2018
3 Jul
'18
2:01 p.m.
Is 206 Washington ? I have the remains of a 4051 4052 and 4010 terminal
sitting outside in the scrap pile. Parts have gone to Europe but they're
still pieces left over
They were about 25 miles west of Portland Oregon.
On Tue, Jul 3, 2018, 1:35 PM Ian Finder via cctalk <cctalk at classiccmp.org>
wrote:
These systems are rare enough that it's probably
worth fixing instead of
treating the board as a simple FRU. There are schematics on bitsavers for
that board, and they are complete.
On Tue, Jul 3, 2018 at 1:21 PM, Monty McGraw via cctalk <
cctalk at classiccmp.org> wrote:
I've been repairing my Tektronix 4052.
I've got the digital logic working - but the text and graphics are messed
up.
I posted photos of the screens in my Tektronix 4052 troubleshooting
thread
on vcfed.
With a scope on the final X amplifier stage - it is oscillating - so I
see
weird horizontal strokes instead of dots for
text. I know from the
service
manual that this circuit includes a feedback
loop, and with the scope I
see
oscillation all around the loop - so I
haven't found the source.
Does anyone have a spare Tektronix 4052 (or 4051) Display Board that I
could buy?
Thanks,
Monty
--
Ian Finder
(206) 395-MIPS
ian.finder at gmail.com