[ny_racer_xxx]

Don't know how it happened, was looking over the back of the machine, and poof! Smoked the BOB, looks like the PC also, $30 ebay Dell, but there goes that isolated theory...

The Bob only has 5v supply going to it, must have fed back from something else, looked like line voltage....

Attachment 350854

[Al_The_Man]

Impossible to say definitively what caused it without exact wiring schematic that is in place.
Does it purport to be isolated system?
Al.

[ny_racer_xxx]

Al, now you mention it, it's buffered, not the same thing...

Like I said, it wasn't 5V that fried it, it was high voltage for sure... Unless I have a bad 5V PS???

Just pissed me off after spending a couple of hours setting up and squaring everything... Ended up making them by hand anyway...



I'll do an autopsy when I'm less disgusted at it...

CR

[whimsical]

looks like everything is on sockets so an ez fix.
The passive componets look ok from the photo

[ny_racer_xxx]

looks like everything is on sockets so an ez fix.
The passive componets look ok from the photo

If you call replacing the PC an easy fix...

[CitizenOfDreams]

If you call replacing the PC an easy fix...

Replacing a $30 computer is DEFINITELY an easy fix compared to replacing, say, a PLC. But the OP must do a post mortem to find out how exactly the line voltage got to the BOB.

[whimsical]

cheap pc is ez
the bob looks super ez as its just a few chips into sockets
wish all the repairs i have done were all that ez
Agree with COD need to explore the cause and that maybe the hardest to find

[A_Camera]

Replacing a $30 computer is DEFINITELY an easy fix compared to replacing, say, a PLC. But the OP must do a post mortem to find out how exactly the line voltage got to the BOB.

Definitely true. It is pretty pointless to just replace the fried chips and computer without knowing what actually happened.

[ger21]

Since it's only a $30 breakout board, I'd probably just replace it as well.

[A_Camera]

looks like everything is on sockets so an ez fix.
The passive componets look ok from the photo

Sockets or no sockets, makes no real difference since probably there is more damage we can's see in the picture. Probably the BOB is badly burned and must be replaced as well. The very fact that more than one chip is blown indicates that there is a serious damage underneath.

[CitizenOfDreams]

The very fact that more than one chip is blown indicates that there is a serious damage underneath.

It's a simple 2-layer board, so any damage would be easily detectable and repairable. But there is a good chance that nothing besides the chips themselves has been damaged.

On the other hand, it depends on your electronics skills. I personally would repair this board, to someone else it might be easier to get a new one. Nothing wrong with that.

[Al_The_Man]

The fact it seems to have affected all the IC's, where was the 5v for the BOB originate from?, if from the PC, normally the supply is referenced to ground, if it was a separate SMPS then I would suspect that as the cause.
Al.

[A_Camera]

It's a simple 2-layer board, so any damage would be easily detectable and repairable. But there is a good chance that nothing besides the chips themselves has been damaged.

On the other hand, it depends on your electronics skills. I personally would repair this board, to someone else it might be easier to get a new one. Nothing wrong with that.

I'd probably have no problem with repairing it but would have problems with finding motivation to do it for $30.

[john-100]

if the board was damaged the first time the power was switched on

I would expect either
1) the BOB's 5V supply was reversed or
2) the 5V supply is faulty or you had a stray connection to another supply


unlike many other breakout boards the C10 only uses part or each of the four 74ACT245 octal buffer IC to avoid over loading them

Attachment 351036


the diagram was traced from online photos to make it easy to see what the various jumpers did

John

[ny_racer_xxx]

Resurrection of a CNC Machine!!!

I ordered a cheap FeeBay, USB powered BOB, PIA, needs a 12-24 supply to turn on the isolation chips???

So I ordered another C10 from Automation, the same style with the chipped buffers, they send me V.11, with SMD's, crap! It also has a Male DB25 header instead of the female of the earlier version..

I find a 25 to 25 male to female in the junk box, 2 actually, can't get the rig to do anything.... Mind you, everything is the same, with the exception of the PC, BOB and cable. I tried one laptop, was acting funky, fiddled with it probably too long, the 2nd laptop seems to be looking better, still no motion. Bob is enabled, and also green led status, good voltage on the drivers, motors lock up, double triple checked wiring, actually just moved them from old bob to new, looked over settings in Mach3.

The only thing that looks odd to me is the cable, pins 18, 19, 22, etc, have no continuity, don't remember exactly, but drawings say these are all grounds?

I'm guessing thinking that maybe the bob needs these to reference the signals???

Great now that Radio Shack went belly up, try and find a cable locally...

CR

[thaisurplus]

hi there

your board saw high ac voltage, to pop every ic, thinking you got hit with lightning with that kind of damage.

suggest you check power supply output for acv and dcv , 0v to power and chassis to power.

check your power plugs as well, make sure your neutral and hots are in the right place have seen hot on chassis do some bad things.

[ny_racer_xxx]

Thanks for the sugestion, first thing I did. Looks the original problem was that the bottom of the board arced off something. BTW, this was an up and running machine for a good while.

CR

[john-100]

if the new surface mount version of the C10 BOB is electrically the same as your original BOB

the printer cable has to have pin 18 connected to enable the outputs when the BOB is connected to the printer port (or a motion controller replicating a printer port)

to enable the outputs the board needs +5V being connected to the enable terminal and pin 18 being connected to pins 19 to 25 via the printer cable

Attachment 371070

the IBM printer parallel port has pins 18 to 25 connected to the power supplies black 0V wires that are also connected to the mains earth/ground


IBM printerport with centronics 36 way & 25 way D-type connector details
Attachment 371072

full address decoding not shown

John


PS
I expect the green LED is a +5V supply indicator instead of the red LED on your original C10

PPS

after looking at the new C10 online it lookes like its possible to add a jumper to ground pin 18

Attachment 371074

the link will defeat part of the C10's enable circuit

[Andreiir]

Don't use same buffered bob , use an bob with octocuplers , and there will be galvanized protection to pc .

[ny_racer_xxx]

Well this is what I got....

Sent a note to Automation Technology, not very helpful, they send you to CNC4PC, really weird. Got no reply from them, went on CNC4PC website, did a chat with the tech, not helpful at all, basically our boards are never bad, it's your problem was the end result. It may very well be my problem, but give me some kind of way to prove it one way or another guy??? Really PO'd, put a claim into paypal, John from Automation called me, (with a Louisiana area code?) and refunded me the cost of the board. So I guess the customer service is good, just the support sucks...

The thing is, I didn't order a SMD board, they don't even list it on the webpage, I ordered the same as the one I blew up so I would be sure there's no issues, they don't make it anymore. I assume nothing from these companies, they can't even get the documentation straight on the 5056 driver's, the dip's are opposite, and they don't even have the correct documentation for this rev of board, I had to get that from CNC4PC...

So I still have nothing moving...

Anyway, I need to test the LPT and make sure all the signals are going through the BOB. I did a search and found a pretty slick way to do that...

Testing a LPT Port

Basically your going to assign the spindle on/off to each output pin, and check that the voltage toggles, then test each input to ground and check the diagnostic screen in Mach....

BTW This bob has a green LED that when the EN has 5v and the LPT is plugged it goes green, indicating that the watch dog is present, but I did buzz the cable also...

CR