# Looking for schematic for circa 8/2017 (CNCRouterParts) PRO4848 **URL:** \ **Category:** General Chat\ **Created:** [July 24, 2024, 12:20am UTC](https://forum.avidcnc.com/t/looking-for-schematic-for-circa-8-2017-cncrouterparts-pro4848/3480 "2024-07-24T00:20:31Z")\ **Posts on this page:** 12\ **Page:** 1
**Author:** ![Samarah](https://yyz1.discourse-cdn.com/flex027/user_avatar/forum.avidcnc.com/samarah/32/1276_2.png) [@Samarah](https://forum.avidcnc.com/u/Samarah)\ **Post date:** [July 24, 2024, 12:20am UTC](https://forum.avidcnc.com/t/looking-for-schematic-for-circa-8-2017-cncrouterparts-pro4848/3480/1 "2024-07-24T00:20:31Z")
I’ve looked through the available schematic downloads for the Plug-and-Play NEMA 34 PRO4848 machine (CNCRouterParts, purchased 8/1/2017) and it doesn’t appear to be available. Revision 17.4 does not match my machine. Anyone know if this early schematic is available? ---
**Author:** ![Eric](https://yyz1.discourse-cdn.com/flex027/user_avatar/forum.avidcnc.com/eric/32/3220_2.png) [@Eric](https://forum.avidcnc.com/u/Eric)\ **Post date:** [July 24, 2024, 12:59am UTC](https://forum.avidcnc.com/t/looking-for-schematic-for-circa-8-2017-cncrouterparts-pro4848/3480/2 "2024-07-24T00:59:42Z")
If you haven’t already I’d contact support through our website. They may be able to dig it up for you if someone here doesn’t have a PDF around. ---
**Author:** ![Samarah](https://yyz1.discourse-cdn.com/flex027/user_avatar/forum.avidcnc.com/samarah/32/1276_2.png) [@Samarah](https://forum.avidcnc.com/u/Samarah)\ **Post date:** [July 24, 2024, 4:10pm UTC](https://forum.avidcnc.com/t/looking-for-schematic-for-circa-8-2017-cncrouterparts-pro4848/3480/3 "2024-07-24T16:10:43Z")
Thanks for the reply Eric. I reached out to support and they don’t have a schematic for this early model. Looks like I would need to upgrade and add a breakout board since this version doesn’t have the available IO for additions. ---
**Author:** ![CKUTCHERA](https://avatars.discourse-cdn.com/v4/letter/c/7ab992/32.png) [@CKUTCHERA](https://forum.avidcnc.com/u/CKUTCHERA)\ **Post date:** [March 13, 2026, 1:54am UTC](https://forum.avidcnc.com/t/looking-for-schematic-for-circa-8-2017-cncrouterparts-pro4848/3480/4 "2026-03-13T01:54:49Z")
Who actually designed the board? Was it CNC router parts or did they buy it? Does anyone at least know the part number? I think I have the same board. I bought the system a couple of years ago. He started with a PRO4848 and expanded it to a PRO4896 There appear to be half dozen or so I/O points (Phoenix connector) on the side of the card closest to the door. I’m a retired EE/SW engineer so this shouldn’t be rocket science but I am scratching my head too. Did you make any progress on the schematic or mapping? ---
**Author:** ![Eric](https://yyz1.discourse-cdn.com/flex027/user_avatar/forum.avidcnc.com/eric/32/3220_2.png) [@Eric](https://forum.avidcnc.com/u/Eric)\ **Post date:** [March 13, 2026, 2:34pm UTC](https://forum.avidcnc.com/t/looking-for-schematic-for-circa-8-2017-cncrouterparts-pro4848/3480/5 "2026-03-13T14:34:44Z")
Have you checked here: [Schematics - CNC Controller Technical Manual](https://www.avidcnc.com/support/instructions/electronics/pnp/manual/17.4/schematics/) ---
**Author:** ![CKUTCHERA](https://avatars.discourse-cdn.com/v4/letter/c/7ab992/32.png) [@CKUTCHERA](https://forum.avidcnc.com/u/CKUTCHERA)\ **Post date:** [March 14, 2026, 5:27pm UTC](https://forum.avidcnc.com/t/looking-for-schematic-for-circa-8-2017-cncrouterparts-pro4848/3480/6 "2026-03-14T17:27:24Z")
Hi Eric, Yes, I have checked all of the posted documentation. It is older than that. I have seen several videos that show the board. The pictures of what I have is much different than what is shown in any of those manuals depict. I will get some pictures of mine and a link to the video posted in a couple days. It may help solve the mystery. -C ---
**Author:** ![CKUTCHERA](https://avatars.discourse-cdn.com/v4/letter/c/7ab992/32.png) [@CKUTCHERA](https://forum.avidcnc.com/u/CKUTCHERA)\ **Post date:** [March 17, 2026, 6:09pm UTC](https://forum.avidcnc.com/t/looking-for-schematic-for-circa-8-2017-cncrouterparts-pro4848/3480/7 "2026-03-17T18:09:59Z")
Eric as a follow up to my previous post, attached are the pictures of what I have in my control box. ![IMG_0932](https://canada1.discourse-cdn.com/flex027/uploads/avidcnc/original/2X/d/d024ab707cc6f6df713a2a27feb0abbfdd6a4fe3.jpeg) ![IMG_0930](https://canada1.discourse-cdn.com/flex027/uploads/avidcnc/original/2X/c/c991ba8d66264b5e63f48d6c90d2e4c6a806540f.jpeg) The 3 pins shown here are 10, 11, 12 on port 2. To confirm I mapped them to Input #0-#2 Pull the + pin to 12V. I did it through 820 ohm resistor because I haven’t dug deep enough into the board to see what the current limiting resistors are. The pins are input only from what I can tell without further exploration ---
**Author:** ![CKUTCHERA](https://avatars.discourse-cdn.com/v4/letter/c/7ab992/32.png) [@CKUTCHERA](https://forum.avidcnc.com/u/CKUTCHERA)\ **Post date:** [March 17, 2026, 6:10pm UTC](https://forum.avidcnc.com/t/looking-for-schematic-for-circa-8-2017-cncrouterparts-pro4848/3480/8 "2026-03-17T18:10:36Z")
![IMG_0946](https://canada1.discourse-cdn.com/flex027/uploads/avidcnc/original/2X/b/bbe1b71951e83537090c201216e298660afe38d4.jpeg) ---
**Author:** ![Eric](https://yyz1.discourse-cdn.com/flex027/user_avatar/forum.avidcnc.com/eric/32/3220_2.png) [@Eric](https://forum.avidcnc.com/u/Eric)\ **Post date:** [March 17, 2026, 8:39pm UTC](https://forum.avidcnc.com/t/looking-for-schematic-for-circa-8-2017-cncrouterparts-pro4848/3480/9 "2026-03-17T20:39:17Z")
What is it that you’re trying to do here, troubleshoot it or modify it? ---
**Author:** ![CKUTCHERA](https://avatars.discourse-cdn.com/v4/letter/c/7ab992/32.png) [@CKUTCHERA](https://forum.avidcnc.com/u/CKUTCHERA)\ **Post date:** [March 17, 2026, 8:47pm UTC](https://forum.avidcnc.com/t/looking-for-schematic-for-circa-8-2017-cncrouterparts-pro4848/3480/10 "2026-03-17T20:47:57Z")
The board functions fine. I think the thread got started because Samarah was asking about a schematic. The board is pretty basic. Reverse engineering it to get the documentation would be easy but I don’t think it is necessary at least in my case. I’m adding a tool setter and eventually the ATC that I have laying around here. Tool setter operates now and signals Mach 4. My issue was I didn’t have the right port selected. Just need to modify the software now to respond to the i/o port changes. I’m sure there is code that I can pretty much just cut and paste from the net if I get lazy. ---
**Author:** ![Eric](https://yyz1.discourse-cdn.com/flex027/user_avatar/forum.avidcnc.com/eric/32/3220_2.png) [@Eric](https://forum.avidcnc.com/u/Eric)\ **Post date:** [March 17, 2026, 8:51pm UTC](https://forum.avidcnc.com/t/looking-for-schematic-for-circa-8-2017-cncrouterparts-pro4848/3480/11 "2026-03-17T20:51:49Z")
The 26-pin header on the 550 card functions as a **passthrough** , allowing for additional output pins to be accessed via a secondary breakout board. While pins 2 through 9 are currently dedicated to the drivers, pins 1, 14, 16, and 17 remain available on Port 1. ---
**Author:** ![CKUTCHERA](https://avatars.discourse-cdn.com/v4/letter/c/7ab992/32.png) [@CKUTCHERA](https://forum.avidcnc.com/u/CKUTCHERA)\ **Post date:** [March 17, 2026, 10:27pm UTC](https://forum.avidcnc.com/t/looking-for-schematic-for-circa-8-2017-cncrouterparts-pro4848/3480/12 "2026-03-17T22:27:41Z")
Going to look around to see if I have that particular BOB. Thanks for the clue on the 550. I’ll keep you posted on the progress.