Hey y'all,
I found this old video, which I believe is the first time I powered up my
2467: . This is a great example of what NOT to
do :). This was recorded on a potato, so please excuse the audio and video
quality.
I messed up plenty after this, but if I'd read the service manual before
popping the covers and around, twiddling pots, etc, it would have saved me
SO much time. It was all good times though, so I don't have any regrets (to
mention), and it taught me a lot.
The critical fault with this 2467 was a single bad zener on the A5 board
that clamped the +1.36, -1.25V references to zero. This led to no traces,
no OSD. Also notice how the attenuators won't stay in 50 Ohm coupling. The
scope though they were frying, again due to that one A5 board fault.
Other than that one Zener on the A5 board, it just needed a bunch of pot
and contact cleaning. Of course after I'd poked and prodded it, it also
needed a full calibration - but then it probably wanted to be calibrated
anyway.
So, if you're poking at your 2465/2465A/2467/2465A/2465B/2467B for the
first time after a fault, don't be like me. Check out the service manual,
or ask here what the front panel is trying to tell you.
Siggi
