Electronics Forum | Mon Feb 01 12:16:13 EST 2021 | rubyjones
Hi there
Electronics Forum | Thu Sep 26 13:55:54 EDT 2019 | ttheis
One of our GSM1 machines occasionally stops running in the middle of a program and I haven't been able to figure out what is causing it. When the issue occurs, the "BM" (bus master) light on the SYS68K card drops out (turns off, no activity) the boa
Electronics Forum | Fri Oct 11 09:49:07 EDT 2019 | ttheis
FYI I did try logicomm but the log files were empty. There must be something wrong with my connections from the force board to the EPC. I'll keep investigating. I also swapped the EPC to see if that makes any difference.
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 | Tue Dec 22 00:11:41 EST 2020 | ttheis
Well it seems you are onto something with the vme power supply. The issue has resurfaced and I did notice the LED's on the keyboard went out when the issue occurs. I looked at the power distribution board to the left of the vme and it shows the +12V
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 Sep 27 15:14:04 EDT 2019 | dilogic
Just one more thought - we had an issue with +12V supply for VME rack. One tantalum cap in the DC/DC converter module for linear encoder interpolator shorted it out, but oddly enough - not always. We ended up hooking scope to all PSU voltages and whe
Electronics Forum | Wed Nov 27 08:54:03 EST 2019 | ttheis
Hi Tushar, Thanks for the reply. I do believe I put it into debug mode but I will be sure to check next time I try logicomm. I am not using any RAMTF or PTF. At the moment I have upgraded the machine from EPC-5 to EPC-5-66 which I found cheap. The
