Analogue-sequencer

thanks for the tips, i gonna test it after work! 
(bad work, can't concetrate, want to fix my p3....) 

Colin f <colin@colinfraser.com> wrote:
> but i still get no signal @ midi out
> is there any self test function on the p3?
> the midi clock is turned on!

The midi out pin 4 is connected to the 5v supply via a 220R resistor.
Pin 2 is 0v direct. Pin 5 connects to the serial output pin on the CPU via
another 220R resistor.
With 'mclk' set to 'on', you should see regular pulses at the midi output
pin 5. The midi output is designed to drive an LED (inside an opto-isolator)
so you can connect an LED between pin 4 and 5 to test it (anode to pin 4).
With the tempo turned up high, the clock bytes should be enough to light the
LED dimly.
If you don't see pulses there, check on the CPU pin itself - it's pin 11.
You can probably use an LED to test the CPU pin too. If you see pulses at
the CPU pin, but not the output, check the 220R resistor, the output socket
and the tracks and solder joints between. Check your ribbon cable is crimped
into the IDC plug correctly too.
If you don't see anything at the CPU output pin, remove the resistor to make
sure it isn't being pulled high or low by a short somewhere. If you see
nothing at the CPU pin with nothing else connected to it, the output could
be fried. If you return the CPU to me, I'll test it and send you a
replacement.

Cheers,
Colin f



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