Museum Report for Sunday, June 26th 2016
Slow day at the museum. One visitor today. He was a fellow InfoAge volunteer, came into the museum to chat, visit and soak up some A/C after mowing the lawns around an IA building or two. Worked on the Amiga monitor, no video/HV at all, all caps check out. Did not figure out the issue even after a nearly full tear-down of the monitor. Reassembled to leave it for next time. Also did a quick overall health check on the Amiga 500 power supply, all caps and voltages check out. All clear on that front, monitor is still dead though. :( The Macintosh was up and running early on, but developed a case of collapse part way through the day. Didn't get a chance to look into it, but it's only showing a vertical line now. I chose to just shut it down for the day. I also spent some time organizing the museum workbench. :) -Todd
Hey Todd! Thanks so much for covering the museum! It's nice to have new docents in the rotation. :) Also thanks for taking a look at the different machines. We can swap out that monitor for another from the warehouse. We have many to choose from. Smart idea to just shut it down for the day when it was acting wonky. Hopefully another more experienced member can take a look at that mac either during museum hours or at the next workshop. And big thanks for cleaning up the workbench! It was really needed! Jeff On Sun, Jun 26, 2016 at 10:12 PM, Todd George via vcf-midatlantic < vcf-midatlantic@lists.vintagecomputerfederation.org> wrote:
Slow day at the museum. One visitor today. He was a fellow InfoAge volunteer, came into the museum to chat, visit and soak up some A/C after mowing the lawns around an IA building or two.
Worked on the Amiga monitor, no video/HV at all, all caps check out. Did not figure out the issue even after a nearly full tear-down of the monitor. Reassembled to leave it for next time. Also did a quick overall health check on the Amiga 500 power supply, all caps and voltages check out. All clear on that front, monitor is still dead though. :(
The Macintosh was up and running early on, but developed a case of collapse part way through the day. Didn't get a chance to look into it, but it's only showing a vertical line now. I chose to just shut it down for the day.
I also spent some time organizing the museum workbench. :)
-Todd
We already know what's wrong with the Mac screen, per something Ian told me a few weeks ago. I will let him explain.
On Sun, Jun 26, 2016 at 10:12 PM, Todd George via vcf-midatlantic <vcf- midatlantic@lists.vintagecomputerfederation.org> wrote:
Worked on the Amiga monitor, no video/HV at all, all caps check out. Did not figure out the issue even after a nearly full tear-down of the monitor. Reassembled to leave it for next time. Also did a quick overall health check on the Amiga 500 power supply, all caps and voltages check out. All clear on that front, monitor is still dead though. :(
The Macintosh was up and running early on, but developed a case of collapse part way through the day. Didn't get a chance to look into it, but it's only showing a vertical line now. I chose to just shut it down for the day.
I also spent some time organizing the museum workbench. :)
-Todd
Sound like the Horizontal oscillator is not running in the Amiga monitor, as that is what is used to generate HV in the flyback, could you hear the 15.7 kHz whine? When a monitor or TV looses horizontal or vertical deflection and collapses to a single line, immediately turn the monitor off or at least turn the brightness down to a minimum, as all the energy that was used to scan the entire screen ins now concentrated in 1 line and will quickly burn the CRT. -- Matt Patoray Owner, MSP Productions KD8AMG Amateur Radio Call Sign
participants (4)
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Evan Koblentz -
Jeffrey Brace -
Matt Patoray -
Todd George