So I am pretty sure the problem is with readout vertical. Output should be
very much stable pulses +3V -3V, at least that's what's in the manual
I have this instead
This is readout vert out, pin 7 of the opamp
I have some pulses 3V and some just 2V give or take.
I can already see the level differences before the mux on the TP29.
Am I right to assume the oscillations cause the blurriness and the level
drops cause the readout to jump up and down ? On the other hand I can't
really make it worse by moving the trace up and down so possibly this is
normal?
The fact that it is interference with trace makes me think this problem
could be elsewhere in the circuit which mixes the readout and trace
together ?
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On Wed, 10 Jun 2020, 01:30 Chuck Harris, <cfharris@...> wrote:
The 2465B manual is 100% the same on the A5 board, HV supply, and
power supply, but about 95% the same on everything else. There are
a couple of extra trimmers on the A1 board, that relate to transient
response.
There are a couple of slight differences in the calibration routines
to accommodate the missing/extra trimmers.
All the hybrids are nominally the same... the 2465B used some that
were selected for better performance...
-Chuck Harris
Ondrej Pavelka wrote:
So here's a update, I have completely rebuilt the impacted sections of
A5 board, added a socket for the Dallas chip but unfortunately that didn't
really had impact on neither of my issues.
I can see the switch scan matrix working fine, all the mux and demux
works correctly and reference voltages are what they should be -1.25 and
+1.36
I am starting to suspect vertical amp to be the reason for low vertical
amplitude because the problem is across all the channels.
The instability of the readout is still there and I noticed while
readout is shifted slightly down.
Where is the readout positioning on the screen? Is that separate board?
I only have 2445 manual and 2465B. Can't find the 2445B manual anywhere.
Is it ok to go by the 2465B manual for the suspected issues as well or
is it not so easy?
