Wacom pen tablet USB-C conversion

This modification should work with any Wacom tablet that can use “Wacom Wireless Accessory Kit”. Following models should work fine:

• Bamboo (CTH-470K | CTH-470S | CTH-670S),
• Intuos (CTH-480S | CTH-480SN | CTH-680S | CTL-490 | CTH-490 | CTH-690),
• Intuos5 (PTH-450 | PTH-650 | PTH-850),
• Intuos Pro (PTH-451 | PTH-651 | PTH-851)

I performed my modification on Bamboo CTH-470.

Requirements:

USB-C breakout board: https://s.click.aliexpress.com/e/_DCZkEld

Soldering equipment + thin wire (I used a wire-wrapping wire, but enamel wire should work fine as well)

Glue (to fix USC-C breakout board inside caddy, I recommend something thicker, like 5 min epoxy)

Instruction (for Bamboo CTH-470K):

First, open up your pen tablet - it has two screws underneath the cover, and two screws under the sticky feet on the opposite end. And a lot of plastic clips.

Then you can solder four wires to the marked points:

For models other than CTH-470K you can use multimeter to find test points according to micro-USB pinout, for this I assume you'd need just a little bit of electronics know-how. For some reason my model model doesn't have a VCC test pad, so it's necessary to solder wire directly to the marked resistor, this may be true for other models as well.

Result should look something like this:

Next, you can solder wires to the USB-C breakout board, according to the pinout shown in “marked points”, and glue it into the caddy:

Note that caddy has to be “upside-down”, so that open side faces away from most of the components , and the cutout in the caddy faces micro-USB socket.

Next, create a small cutout (with exacto knife, or whatever you have handy) in the cover to allow for the wires to pass through. It may be possible to pass thin wires next to the wireless transmitter connector, and not having to create a cutout but mine were too thick.

You can now put everything together.

I found it the easiest to put PCB back into the case, and use a piece of tape to keep wires inline with the cutout created in previous step, so they aren't pinched when closing the case.

I created a small piece ("blank") to cover the micro-USB port. Since it's still active you can decide not to cover it up, but make sure that you don't plug two cables to the pen tablet at the same time!