3 Jul
2018
3 Jul
'18
1:35 p.m.
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