I'm trying to troubleshoot an old analog oscilloscope (Metrix ITT instruments OX 725), which seems to come from the late 1980s in France.
There is (part of?) a service manual with circuits diagrams available online (https://archives.doctsf.com/documents/afficher_document.php?num_doc=100437&num_fic=1), but I'm having a hard time piecing together how the circuits are actually connected.
In particular, there seem to be three different symbols used for 'this part connects to a different circuit' that I can't identify. Does anyone know what they mean and what the difference between them is?
These are the most common ones.
These kind of look like arrows. Most of them (but not all) have markings like
-12V and point according to the sign of the number, so maybe they indicate connections to the power supply and some are misprinted?
These look similar to modern connector symbols, but not quite the same.