How to solder a new revision Samsung E810 "Model:PC818NSE" serial cable for use with the gp2x.
As i do not own a gp2x myself, this modification was done for a friend of mine that ordered a Samsung Data Link Cable at ebay and wondered, that it looked so different to the description of SamsungE810Cable.
As the new Cable has no printed pin-descriptions like RXD or TXD on it but just plain numbers it was hard to find the correct pins (needed schematic of the serial chip and a multimeter to find the solder points needed). A pro of the new cable is the existence of solder pads to all pins of the EXT connector so you don´t need to solder cables to the pins directly anymore.
same as SamsungE810Cable but no knife, extra cable or super glue is needed ;-)
Open up the female DB9 (RS232 serial connector) end of the cable
There are just two screws to open in the housing and two plastic clips. There are two long thread rods for the fixation of the DB9plug to the PC that are put through holes on the left and right side of the connector.
Open up the EXT connector end
The EXT connector also needs two screws to be opened and two very small plastic clips.
Now, you can directly begin to desolder the cables from both PCBs. You don´t need to remember the colors of the original cable.
Soldering the pins
Take the DB9 side (serial interface) and solder the following pads:
- red cable to pad 10 (front)
- black cable to pad 1 (backside)
- green cable to pad 6 (front - Attention! Dont mix it up with pad 9!)
- white cable to pad 7 (backside)
Now take the EXT side (gb2x interface) and solder the following pads:
- red cable to pad 5
- black cable to pad 1
- green cable to pad 2
- white cable to pad 3
Attention: i used the numbering on the Samsung PCB as you can see it on the picture ! (This is not the pin numbering as per the EXT_Port documentation!)
Testing the cable
Cut the two plastic "noses" on the EXT connector off with an exacto knife before jamming it in, to avoid the chance of bending the gp2x serial connector out of shape. Put the EXT Connector into your gp2x (yellow arrow up) Put the DB9 connector side to the serial interface of your PC. Open a terminal emulation (150200,8N1,XON/XOFF) on the correct serial interface. As soon as you switch on your gp2x you should see the output of the booting kernel ....
VOILA ... you´re done !
some more Info for the interested
Samsung now uses a Intersil ICL3217E Low power RS232 RX/TX Chip. Here: http://www.intersil.com/products/partsearch.asp?txtprodnr=icl3217 you can find the schematics.
Have fun !
Yeah ... have fun! :-)
--LordLoetkolben 07:58, 3 August 2007 (PDT)