Electronics Forum | Thu Jul 07 14:58:18 EDT 2011 | vickt
Prasad, It is typical when experimenting with new materials to have to adjust the airpressure on the syringe and the stroke of the PDP piston (screw adjust on top of the PDP pump). You can add mutiple cycles in the comp Db to make larger dots with th
Electronics Forum | Tue Dec 22 23:57:21 EST 2020 | ttheis
Ok; is this the 5a box located under and behind the pdp? I see now in the diagram it is labeled pdp1.ps1. Any suggestion for what to check to determine if the problem is the power supply or something connected to it? I noticed that when the 12v po
Electronics Forum | Fri Jan 29 22:26:09 EST 2021 | ttheis
Thanks for the heads up. I suspect it is due to power dropping out to the IO chassis and other devices connected to the pdp. This is the first logicomm capture I have for it so I don't have other messages to compare it to. Machine has been running al
Electronics Forum | Fri Feb 26 02:41:10 EST 2021 | ttheis
We have been running the machine for about a month after replacing the pdp power supply. We have not had a repeat of the problems since. I believe we can consider this issue resolved. Failing pdp supply was a known issue in the uic kb.
Electronics Forum | Fri Dec 10 10:51:04 EST 2004 | pjc
Dynapert VCD E/K2 is a very old machine, from the 1980's, runs on DEC PDP8 and its way obsolete. Worth scrap value.
Electronics Forum | Fri Jan 29 13:25:43 EST 2021 | ttheis
Update: I have replaced both dc-dc converters without any improvement. Observing the issue again yesterday I was able to see more of the problem. Logicomm reported a bus error at fcff1043 running "butt" (photo attached.) The DC power ligh
Electronics Forum | Tue Dec 22 15:10:57 EST 2020 | ilavu
Tom, There are two power supply in the machine. One on top of VME box and other behind power distribution panel. The voltage that you see and check at PDP is not from VME.
Electronics Forum | Wed Dec 23 00:06:15 EST 2020 | ttheis
I believe I found the power supply you refer to on the back side of the pdp mounting panel. I will have a look at it.
Electronics Forum | Wed Dec 23 12:53:59 EST 2020 | ttheis
Thanks for the detailed information. I have a spare dc/dc converter on order to try swapping them. Another note is all dc power is cut out by the pdp.ps1, not just 12vdc. 24vac power remains.
Electronics Forum | Wed Dec 23 19:50:28 EST 2020 | ttheis
Thanks; I have a spare power supply coming as well. I will start by swapping dc-dc converters first and if the problem persists swap the pdp power supply. I'll report back what I find.
