On Sat, May 7, 2022 at 06:33 AM, visitslovenija wrote:
Hi Guys,
I'm working on a restoration of a TDS540 with all the usual problems. It also
has a not very clean square wave on the calibration signal, so have been
looking at the front panel board to try and sort it.
But, either I'm being a numpty and not looking at this right, or the board I
have is a different version to what the schematics show, but I have not been
able to find any other schematics. So can anyone with experience of the 540
help me out here?
I've uploaded some photos to an album called TDS540 Front Panel (is that the
right way to do this?). It shows the part of the schematic with the cal signal
output coming from Q1, and a shot of the board (with the two screw heads) that
is clearly quite different; the collector of Q8 is connected directly to the
output.
Board layout of calibration section looks closer to TDS520B calibration signal generator:
Ozan
