MSefi.com read only forum (Jan.15,2018)

hi all and thank you for your patients. i have MS2 v3 that was build by someone else. in my process of double checking build,i am at the point of verifing serial comunication and it doesn't pass the final loopback comunications test. when i tested a db9 cable and serial port on my computer, the port and cable pass the test. i also have a RS232 to USB adapter from DIYAutoTune that passes as well. i was going through all the troubleshooting steps, everything checks out. i have tried two separate computers and still no comunications. the only tests that i am unsure of are the voltage tests at the MAx232. does this sound like a bad MAX232? your help is most welcome.

It could be, but first make sure you've got 5 volt power.

i have my 5v on the board where it suppose to be. which pin on the max232 am i suppose to have 5v? that's where i get a little confused, on the max232,what voltages should i have on which pins. i really would like to fix this board rather than build another. thanks so much!

http://www.megamanual.com/ms2/pcb.htm

Drawing (Sheet) 8 of 8 is the section of the schematic you want.

Thanks guys! Hopefully this will shed light on the problem.

last night I replaced the max232 and c26-29 as per instructions, and it's fixed.I want to thank you for your help!