Hi John,
There are a few things you could do before opening the cabinet.
It's possible that the scope is working normally but showing no trace because of a fault in the (un)blanking circuitry. You might check the signals at the rear panel BNC output connectors (Vert Sig Out, Gate Out, Sawtooth Out) to see if there is activity inside.
An (un)blanking fault could be present in the path from 7B plugin to/through the main interface board. I think, but I have no 7603 to test this myself, that the CRT will be unblanked anyway when you try the 7603 in XY mode using two 7A plugins. (Try this unfocused to avoid phosphor damage.) The dot position should listen to position controls.
Albert
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On Mon, Jul 23, 2018 at 05:57 PM, <johnasolecki@...> wrote:
Hello everyone,
The '03 seems to work when the 7L12 is installed
but I can't get any kind of trace (except for readouts) when I use any of my
7000 series plug ins. I can't say I've tried every permutation but I've tried
installing a 7A19, a 7A22, 7A26 in conjunction with a 7B92, 7B92A, 7B80 and a
7B85 with the "A" plug ins in the center & left slot and the "B" in the right
with no joy.
Because of this problem I'll be opening up the 7603; if anyone has any
specific suggestions on where to look I'd be grateful but otherwise are there
any common procedures for the overhaul of an older scope?
