Hi Max,
Did you read the other readout problems thread, concerning a R7903? Very informative and you might have a similar contact problem.
First of all put a dual channel vertical amplifier (like 7A18, 7A26) in the right vertical bay and find out whether the problem is restricted to just one of the channels. If so, you might also have that bad contact in the main interface (backplane) connector. If the problem is the same for both channels then one or more of the Time Slot contacts could be bad. Each TS pulse (TS-1, TS-2, ...) uses its own plugin contact, common for CH1 and CH2.
The ReadOut display is "compiled" from the results of several TS pulses. Hence a change in readout as response to turning V/div is not a guarantee that *all* connections from plugin to readout board are intact.
Albert
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--- In TekScopes@..., "max_3289" <max_3289@...> wrote:
as this is my first posting in this group i hope doing right...
I want to ask for some advice solving the following problem:
After some weeks of storage, the readout of the centre bay (right vertical module) makes problems: first the text itself was not OK (-> "4", "40m", "3S" (!), ...), then there was no text anymore. A few weeks in the past, everything was OK.
Changing the vertical modules did not move the problem, therefore the modules must be OK. As there were changes in readout when changing the scale factor, connection to the readout board A13 (early version without ROM) seems to be OK ?.?
Readout of the left vertical module and the timebase is OK.
I have not found a proper starting point in the schematics to begin searching. Hints and advices are highly appreciated.
Thanks a lot,
Max
