WP 34S flashing problem Message #1 Posted by Gerson W. Barbosa on 1 Mar 2013, 1:05 p.m.
Yesterday I tried to upgrade my WP 34S to the latest firmware using Harald's USB board. That's the first time I tried to do this since I installed it. I know I should have tested the COM port first, but I didn't (the driver had been successfully installed so I thought it was ok, but I later found out the COM port didn't show up in the WinXP device manager). So, no wonder I got the message "Unable to connect" from MySamba. It behaved the same way in two other computers.
It appears to be a hardware problem. I remember the calculator would reset when the USB cable was connected in USB 1 ports, and sometimes even when connected to a USB 2 port. When I checked the USB board I noticed a small drop of solder between the pins #10 and #11 of the FT230XS chip. I thought I might have dropped it there when installing the board, so I removed it, but this didn't work. But in all application exmples in the datasheet the pins #3, #10 and #11 are connected together, so I shorted pins #10 and #11 again (I don't see this in Harald's pictures, however). I've also checked all connections.
I know Harald checks his boards before shipping them. If there is something wrong, it's due to something I did. I would like to know if there is some troubleshooting steps I could follow, considering this is really a hardware problem. Another question: is it still possible to use the original programming cable when the USB cable is installed? Thanks for any help!
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