dear all,
I dropped my 7904 from its cart last week.
Up to the moment the identified losses are:
1- broken 7B85 time/div pot and cal/uncal knob and rod
2- Very noisy redout pot
3- Garbage number showing on the top rows of readout
4 - No information shown in redout bottom lines.
Probably issues 2 to 4 were already there, since I had almost no time to play with this instrument since I bought it some weeks ago.
I was thinkin to start with the easiest issue (2) which would require spraying a little of Deoxit Fader on the pot's wiper but, to my surprise, it seems impossible to get there
see (
/g/TekScopes/album?id=302608).
So I would like to know if there are known practices of what to do in situations like this one.
I have read somewhere that one possible solution is to drill a 1/8" hole on the case to allow sprying the cleaner than later closing the hole with some inert putty.
Is this an "approved solution"?
Also, I intend to reseat (with some Deoxit) all the IC's and connectors of the redout board.
Any other recommendations concerning the random readout characters?
Is there a known fault that would cause the entire bottom readout line (all four fields) to be missing?
Thank you very much,
Roger
