test1
June 27, 2017, 01:11:52 AM *
Welcome, Guest. Please login or register.

Login with username, password and session length
News: You can attach photos hosted by the forum rather than using an external image hosting site, this means they will stay forever and not disappear after a year or two.
 
   Home   Help Search Login Register  
Pages: 1 2 3 [4]
  Print  
Author Topic: Converting Wacom KT-0405-R from Serial to USB  (Read 30175 times)
Manni
New Poster
*
Posts: 19


View Profile
« Reply #45 on: July 01, 2012, 08:30:12 PM »

I do really hope this highly artistic drawing helps someone.  Smiley


* drawing.jpg (73.07 KB. 1055x1000 - viewed 822 times.)


* drawing.jpg (67.64 KB, 1055x1000 - viewed 678 times.)
« Last Edit: July 01, 2012, 08:38:38 PM by Manni » Logged
hornpipe2
New Poster
*
Posts: 3


View Profile
« Reply #46 on: November 18, 2014, 05:04:32 AM »

I really hope there's someone who still reads this forum, because I've screwed myself quite royally in a KT-0405-R conversion.

The instructions for removing the ADM202 state to "use a Dremel" as an option.  Well, I got out the dremel, and ham-fistedly gouged out the pads that the chip used to sit on Angry  ...At least the chip is gone?

What I need to do now is attempt to follow the broken traces to the other endpoint and solder there.  I managed to follow pin 9 back to the M377* chip (so I can ground it), but pins 11 and 12 I can't find the other endpoint.  Or even the start point.

I posted giant high-res photos on Flickr of the damaged area here, if anyone can take a look.



I'm wondering if someone with another tablet - say, the UT- or GD-0405 - might have a similar layout that could give a hint.  R03 and R04 are somewhat suspect, as well as any of the surrounding capacitors or the CP04, 05, 06, and 07 points.
« Last Edit: November 19, 2014, 06:46:13 PM by hornpipe2 » Logged
DaBotz
Sr. Member
****
Posts: 205



View Profile WWW
« Reply #47 on: November 18, 2014, 04:21:17 PM »

IMG_5422
IMG_5425

It gives "private pages", access is not allowed...
Logged

The most incredible artist of... Barbanza?
Aerendraca
Administrator
Hero Member
*****
Posts: 1057


View Profile
« Reply #48 on: November 18, 2014, 09:56:16 PM »

I concur! Try posting the images to the forum.
Logged
hornpipe2
New Poster
*
Posts: 3


View Profile
« Reply #49 on: November 19, 2014, 06:40:51 PM »

I fixed it!  The photos were actually invaluable in being able to follow the traces where they are supposed to go.

All three important pads lead back to the Motorola chip on the board.  If you lift the pads removing the ADM202 pad, you can either solder to some test areas, or lift the legs on the chip and solder to that instead (what I did).

I color coded the pads, test points and pins so you can see them here.  Red is ADM202 pin 9 which is supposed to be grounded (use the Red-boxed end of the capacitor here).  Cyan and Magenta are pins 11/12, which lead to TX / RX.  Actually, I forget which pin is TX and which is RX, which is why they are listed Green on the Motorola chip...  You can test with multimeter or just do what I did - try the Teensy with the hid_debug firmware and swap the wires between D2 and D3 until you get response from the tablet : )

Finally: there is no TR1R to remove/bridge on the KT-0405-R.  I spent forever searching for this, then decided to connect it up anyway, and it worked fine.

« Last Edit: November 19, 2014, 07:21:08 PM by hornpipe2 » Logged
hornpipe2
New Poster
*
Posts: 3


View Profile
« Reply #50 on: November 19, 2014, 07:18:56 PM »

Here's a photo of my mod.  I put the Teensy inside at the bottom-left corner.  Had to cut some plastic to fit the USB port.  I also drilled a hole for reprogram button.  Covered both with electrical tape - everything fits snugly and closed up fine.  The pen is a Samsung Galaxy Note S-Pen with eraser and button.  Cheap off eBay if you need a replacement.


* 1119141209 (1).jpg (231.8 KB. 1173x879 - viewed 378 times.)


Installed 6.20 drivers on OSX and burned the latest 0.15a WaxBee firmware.  Now recognizes as an Intuos2 and GIMP handles everything!  This project is awesome!


* test.jpg (82.65 KB. 1024x724 - viewed 279 times.)

Logged
Aerendraca
Administrator
Hero Member
*****
Posts: 1057


View Profile
« Reply #51 on: November 21, 2014, 09:52:38 AM »

You certainly did take a chunk out of the poor Wacom. Good job at fixing it, glad to hear you got it working.
Logged
Pages: 1 2 3 [4]
  Print  
 
Jump to:  


Powered by MySQL Powered by PHP Powered by SMF 1.1.21 | SMF © 2015, Simple Machines Valid XHTML 1.0! Valid CSS!