Re: 2465B - Weak Readout Intensity
The trigger hybrid triggers the A and B time base hybrids,toggle quoted messageShow quoted text
and they feed their gate signals (/SG) into the the PAL U975,
which chews on them, and feeds FF U980B, which talks back to
the PAL, which passes it on using /SGB goes back to the
trigger hybrid, and display sequencer.
So, it could be the trigger hybrid, the sweep hybrids, the
PAL (clean its socket), and U980B's flip-flop.
There is a Parametric Measurements flow chart, you should look
My recollection is it is usually the trigger hybrid, the trigger
hybrid's socket, or the PAL's socket.
I tried cleaning and deox'ing the Trigger Hybrid, but the problem remained. Swapped it out with another chip, and still not change, or at least no meaningful change. (Curiously the error text from the chip out of a 2465 was just, "NOISEY OR APERIODIC SIGNAL" without the "CH1:" prefix.)