Core module voltage test

Testing/Troubleshooting
1

Hi All,

I’ve just finished building the core module and am doing the voltage test. The voltages are all measuring correct according to the test on the mbhp_core page:

IC1:MCLR(1) - IC1:Vss(12) = 5V

IC1:Vdd(11) - IC1:Vss(12) = 5V

IC1:Vdd(32) - IC1:Vss(31) = 5V

IC2(8) - IC2:(5) = 5V

I just have a question regarding the entry in the FAQ. The FAQ says to then test the core module with the IC’s plugged in and measure for 5 volts between any ground and 5V pin.

I am still getting 5V on all the above pins EXCEPT for the MCLR (pin 1). Should this not be 5V with the PIC plugged in, or do I have a short somewhere in my circuit?

Thanks.

2

Hi,

yes, it should be 5V - maybe a short.

Btw.: there is a better measuring diagram which can be found here:

http://www.ucapps.de/howto_debug_midi.html

Best Regards, Thorsten.