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Messages - trev36

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11
General Mach Discussion / Re: Fried 2nd Computer (Newbie)
« on: June 09, 2008, 07:53:31 PM »
I have checked for the obvious over and over rewired as per the diagram. I am still using the 7812 voltage regulator. I have tried several different 7812 voltage regulators . I have one 7812 connected right off of the filter capacitor. Checked I have 12volts everytime fan works and 12 volt LED lights up. The Bob checks out fine as long as I do not connect it to the computer. I have the correct cables now from Probotix and a brand new Bob which I checked with volt meter before connecting to the computer. It was all great until I connected it to my computer. That is when the Ground wire got hot from 7812 to the onboard voltage regulator LM317 which supplies 5volts to the bob which is on the bob itself from Probotix. I have followed instructions from Probotix as to which jumpers to remove which is only jumper 5. I have checked the Bob over and over this time before connecting to the computer. I am thinking that I did some damage to the parralle port yesterday when I hooked up the Bob that had 5 volts on the ground shield. I had already powered the bob connected to the computer before I knew that the shield was actually a ground. Do you think that my paralle port is messed up now?

Thanks

Travis

12
General Mach Discussion / Re: Fried 2nd Computer (Newbie)
« on: June 09, 2008, 05:23:00 PM »
Ok just received the LPT cables from Probotix and the optoisolated bob board. Hooked just board to 12 volt supply and to computer. turned computer on Led on board came on engaged mach3 then powered up bob and the line across the screen has come back and the ground lead from the bob to the 12 volt supply started melting. ??? What does this mean?

Thanks

Travis

13
General Mach Discussion / Re: Fried 2nd Computer (Newbie)
« on: June 08, 2008, 01:51:06 PM »
Hello Dave, Chip , Jimpinder and Hood

Thank you for taking your valuable time to help me. I am going to redo things today as noted. I really do appreciate this help.

Thanks

Travis

14
General Mach Discussion / Re: Fried 2nd Computer (Newbie)
« on: June 08, 2008, 12:16:16 AM »
Question. The DB25 male to male cable if I understand this correctly has to be wired straight thru. Is this correct? If so I think the IEEE 1284 cables are wired differently.

Thanks

Travis

15
General Mach Discussion / Re: Fried 2nd Computer (Newbie)
« on: June 07, 2008, 11:38:09 PM »
Here is diagram I drew with MS Paint.  Not very handy with the mouse trying to draw. I don't have a scanner so I can't upload my sketch.


16
General Mach Discussion / Re: Fried 2nd Computer (Newbie)
« on: June 07, 2008, 02:54:43 PM »
Thanks Chip

I checked both parallel port cables and I have 5volts on the outer shell of the d connection no ground on pin 18-25 and also noticed on the cables in small print IEEE 1284 high speed. I ordered two cables from Probotix hopefully this will solve the problem. i found an old Iomega LPT cable that is female to male and it has a totally different number and description altogether. Can someone tell me the cable part number I am suppose to use?

Working on drawing and yes I did the wiring in my head I didn't have a diagram. Maybe next time I will take more time.

Thanks

Travis

17
General Mach Discussion / Re: Fried 2nd Computer (Newbie)
« on: June 06, 2008, 09:06:37 PM »
Thanks Hood & Dave

Ok this is what I have. When I tried to power up Probotix Bob with 12volt Lm7812 with nothing else connected the LED came on I checked voltage and had +5 volts on all the pins that are suppose to have 5 volts. When I connected board to this other computer that has a bus speed of 800Mhz and CPU speed of 1.9 Ghz Mach3 had lines running thru the screen horizontal lines and LED on bob never came on. I then turned off power immediately didn't look good. I guess i'm still freaked out about frying my other two computers. The breakout boards are not the problem can't be what are the odds of three different breakout boards being bad. Could it be my paraell port cables. I have two one from radio shack and the other is Belkin. Same results.  I must have a short somewhere, but where?
None of this is making sense. I'm totally at a loss. Anyone know what might be my problem.

Thanks

Travis



18
General Mach Discussion / Re: Fried 2nd Computer (Newbie)
« on: June 06, 2008, 05:32:29 PM »
Hello Dave

I'm not sure what the 0volt rail is ? Is it ground?

Thanks

Travis

19
General Mach Discussion / Re: Fried 2nd Computer (Newbie)
« on: June 06, 2008, 03:42:17 PM »
Hello Dave, Hood and everyone

In the picture to the right of the +5 volt LM7805 I have a LM7812 wich is hard to see but I have that connected to the probotix LM317hv . I also use it to power my fan which is towards the back of the box. I just got around to this today. I haven't had a chance to try anything yet.  So you think I should try just the breakout board with no drives connected first using mach to see if i get step and dir signals out of board. How would I check for this? I'm not that swift with all this. I do have volt meter. Thanks for all the help.

Thanks

Travis

20
General Mach Discussion / Re: Fried 2nd Computer (Newbie)
« on: June 05, 2008, 07:31:51 PM »
Thanks Hood.

Here is photo of my mess. Maybe you can see something I don't. The breakout board in the picture is from probotix. I changed out the C10 after it cooked. I haven't tried to power anything yet.
Any help much appreciated.


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