I think for something to be repaired it has to work in the first place right?
Anyway, I have a Replica 1 from Briel Computers that I built a few years back but the serial port has never worked on it. Now that I have a shiny new Rigol DS1054z, I flt it was time to track down the issue. A look at the schematic and it seems to me that the MAX232 on the board isn't functioning correctly. I measured the voltages from pins 2 and 6 with respect to ground and they read 4.73V and 0.1V respectively. I don't know a lot about the 232, but looking at the datasheet, this is definitely not right.
Now I'm just wondering if its a simple job of lifting out the old MAX232 and replacing it, or if the caps/other parts of the circuit are the problem? I've tried to post this on the Briel Computers forum, but you need approval to post and Vince seems to have gone AWOL.
Hopefully you fine people can help! Thanks