Hi y'all,
I just bought a 2467 on eBay. It came with option 9 - which I understand is the counter/timer? Unfortunately it doesn't seem to light up the CRT at all, no traces, no OSD.
On power-up, it does seem to go into diagnosis, as I have to hit one specific front-panel control before it'll respond to any others. After this, I can mess with the front panel controls, and e.g. the channel/trigger lights all toggle with their corresponding buttons. However, any time I change any setting, all the front panel LEDs flicker. Also, when I set channels 1/2 to the 50 Ohm input setting, they stick for about a second or so, but then I hear a relay toggle again, and the GND input lights up again.
Do those symptoms ring a bell with anyone here?
I took it apart and pulled the PSU?to see whether there's anything obviously broken. It looks to me like the PSU has been re-capped, as there's a mix of colors on there. I tested all the rails, and they look about right, though I couldn't load the 5V with more than a single 7.5 ohm resistance at a time. When I loaded J303, I saw an undershoot for a second or two, then it seemed to drop into regulation at ~4.9V. The 7.5 ohm on J232 didn't quite seem to be enough load, though the voltage dropped a fair bit when I did it. The 10V reference was spot on, as were e.g. the 87 and the +-15 rails.
The others were all high, but then they were unloaded...
I guess next I'll measure the rails with the PSU in-place, check ripple etc?
Are there any pictures here of 2467/2465A PSUs in original condition that I might use for comparison?
Are there other quick things I can look at to assess the damage/hopes of repair?
I understand the 2467 has a "screen saver" that'll shut down the CRT on a timer? Presumably this is under digital control - so I'm hopeful that the CRT or control circuitry isn't beyond rescue?
I have a functional 2465 I was hoping to replace with this one, so I can have peek around.
Siggi
