Pablop

Hello, Made another test: took out the pic and measured voltage from ground to TX pin. It read .05V, what I think is normal when I have an open circuit, and that´s what we want here, isn't it? This I did because I thought that maybe some of the 5v delivered by the pic in that pin could be going somewhere else, in case of a non-wanted contact between adjacent tracks. Hope that´s useful. Thank You

Hi Thorsten, First of all, THANK you for your answer, and what´s more, for this incredible project. Following your guide I made the 5V appear on Rx. Apparently there was a broken joint on the pull up resistor. But Tx is still at 3.2V. With my scarce electronics knoledge I understand Tx should deliver the 5v to that "line". There are not too many connections. So I checked whether there were any unwanted contacts ( I used an ohmeter) with all adjacent tracks, and found nothing. Any feedback will be much appreciated. ( I have to say I´m very impressed with the quick answers in this forum! ;) ) Pablo

I´d like to add some more details, maybe they help... All +5 voltages are ok but those to Tx and Rx. Ground to Tx: 3V Ground to Rx: varies a little around 0.5V Just to make it clear, the application is up and running, showing in the display the menus, pot movements, etc. Thank you PD: the led test doesn´t work (no flicker, no light at all)

Hello people, I have what was until yesterday a little fully-working MB64. Midi has stopped working, and, following the troubleshooting guide, I see I have no 5v at PIC´s Tx and Rx. (TEST CORE4, all other +5v are OK) I´ve already checked all solderings, voltages in core, etc. and, everything is ok. The test results are making me believe what I suspected, that is maybe I burned the Tx and Rx on the PIC. What do you think? Is there anything else to do before buying a new PIC? I forgot to say that all other functions (menus, pots, LCD) are working. Tanks a lot Pablo ???

Ok, I´ll get another PSU. :-\ Thank you very much!

Thank you, Wilba. I´ll try one of those appz.

Hello everybody! I´ve read "Core power supply theory of operation" and so I understand the higher the voltage the higher the temperature. But I´m no expert. Could you answer me whether a 12v PSU will produce to much heat in the 7505 regulator without extra heatsink? Thank you in advance

Hello people! This is my first post, but i´ve been following this project and forum for a long tima (years). I'am slowly building a midibox 64 that´s already working, but still has a few pots and buttons. I´ve programmed my pic with the JDM burner, the only available at the time I started. But I had to do it under Win 2000. Under win XP it was inpossible for me to do it. I found this "Link to a solution for WinXP" in this forum and this "Follow this link if you are a Windows XP user (thanks Rowan!)" in JDM page, but these links don´t work. Where can I find this info? Thank you very much Pablo