Fix Cloned Arduino NANO CNC Shield

Modifying Clone Keyes CNC Shield.

One the web are Chinese cloned Keyes CNC Shields for the Arduino NANO.

They are cheep and good value. BUT.

If you want to set Micro Stepping as they are, you can't.

Who ever cloned/made this shield made a mistake and put the pins that should go to Vcc, to GND.

As the pins that set the Micro Step Mode are already pulled down to GND internally as default, and to change there state, they need pulling up to Vcc.

Step 1: Ways to Identify a Cloned Arduino NANO CNC Shield

1. The original Keyes Nano CNC Shield has a dark solder mask. (it looks blackish)

2. there are some print errors. Pins D9 and D10 are incorrectly identified. Control is spelt Contr01.

3. Look at the circuit track and see if the pins are connected to GND.

Step 2: Isolating Pins Top Side

The first step to put things right, is to isolate the pins from the GND rail.

This needs doing in Eight places.

First Two are on the top side.

I found, warming the header pins, made it easier to slide of the plastic supports.

Step 3: Isolating Pins Bottom Side

The next Six are underneath.

Step 4: Check That the Pins Have Been Isolated

After isolating the pins, check that they Are Isolated, using a circuit tester.

Check that they are no longer connected to ground.

Step 5: Connect Broken Ground Track

Isolating the pins from the GND track has separated the GND track and need reconnecting in two places.

Solder two pieces of tined copper wire in the place shown.

Step 6: Connecting Pins to Vcc

Now the isolated pins need connecting to the Vcc circuit.

Luckily there are pins connected to this circuit close by to the isolated pins.

Using tined copper wire make solder bridges to these pins as shown.

Be sure to keep the tined wire away from the track that runs under the bridge.

Step 7: All Finished

That's it.

The Micro-Step jumper Header Pins should now work as they should.

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