Retrofit of Precix 5x10 CNC

Thanks bevins, I just emailed them.

I also found this in a PDF manual of a really nice looking replacement controller. Which if I had a bigger budget and saw before I started doing this I might have looked into...

It's dead on with the pins, and colors match up except for the pin 2/3 yellow brown.


Does anyone know of a way to test these wires to see if I can figure them out without destroying the encoder

The encoder colors look reasonable.

Its possible to verify power and ground before connection by taking the encoder
cover off and checking the power pins of the chips/bypass capacitors with an
ohmmeter.

As far as drive wiring goes

I do expect you will have to ground ( to pin 10) the drives
/POS ENABLE and /NEG ENABLE pins

Thanks PCW, I will update my wiring diagram, that's awesome!

I will take off the cover and check them out today...

Magmotor got back to me fast with a schematic, pretty good support in my opinion.


Was pretty confusing until I saw revision history, then it started to make sense.

PCW wrote: supplying 7I77 5V from FPGA card is not recommended with a 5I25/7I77 due to drop
in the connecting cable, but with a directly connected 7I92M Its probably OK.

Use USB cable to power 7i92M, also set jumpers to power 7i77 mounted directly to 7i92M, works always.
5i25 or 6i25 powering 7i77 through the parallel cable, had only one instance of it not working due to crappy cable quality, changed the cable, works properly. BUT, since that issue i tend to power 7i77 from a USB cable, not through parallel cable.

As always thanks for everyone's input!

I updated my wiring diagram per PCW's recommendation for the drive interface. I also took a guess on the encoder interface with the details I got from Magtronic. Hopefully someone can tell me if it make sense or not.



I took off the CAP of the encoder and would have to start to take it apart further to find details PCW mentioned.

I am thinking with the manual I found and the drawing Magtronic sent I can be fairly confident in the wiring, what do you think?

Anyone want to see more pictures (why I don't know) can see them here:
photos.app.goo.gl/wBgjA9fuxgXsEZX96

Well I am screwed...

I went ahead and stopped supplying the 5V from the 7i92 by changing jumpers W3 and W4 to the down position. Like they were by default. On the 7i77 I put W5 to the right hand position. I went through it several times to make sure I did it right. Everything was working before when the 7i92 supplied the 5v. Turned it on to make sure I was getting a PING and I got smoke coming from 7i77. Disconnected the 7i92 and powered it by itself and it appears to be working fine, still responded to a ping, however. I checked pins 22/23/24/25 and it was still supplying 5V to those pins.

I kept thinking I did it wrong, but ethernet port on the left W3 and W4 down and still it supplies 5v, what in the heck did I do wrong and what did I fry, I can't afford another one of these 7i92 7i77 units. Can I switch the 7i77 back to W5 right and let the 7i92 supply power?


This really bummed me out, I really wanted to take things slow because I can't afford a mistake and this happens.
Checking the 7i92 not connected to anything, maybe I had the pin wrong? does it supply 5v on other pins even with w3 & w4 down?
I should have left it alone, but when PCW said:

supplying 7I77 5V from FPGA card is not recommended with a 5I25/7I77 due to drop in the connecting cable, but with a directly connected 7I92M Its probably OK.

I didn't like the "Probably OK" bit...

Thanks for any help,
Randy