Analogue-sequencer

> my PSU *does* output DC. i thought center positive was what was required,
> but i guess i was wrong. anyway, i rewired the power jack and woo hoo it
> lights up!!!!

Cool, that's a start...

> however, i'm unable to initialize the memory so it just sists there
> freaking out. the reason i can't do this is because the whole first column
> of keys on the function keypad is not working... i probably crunched some
> diodes (damn diodes again! :) when i was snipping out the tact switches to
> replace them with maplin switches. more ordering from mouser... hooray! :)

A single bad diode shouldn't take out the whole column.

> the other issue is that the step key LEDs do not light up at all... at one
> point, i did manage to get the P3 to do something, and pressing the switch
> did acutally switch modes... the step key LEDs were changing in an
> expected fashion. would problems on the keypad or with a lack of
> initialization cause this?

Sounds more like it could be wiring problems.
Difficult to tell from here...
Have you got a multimeter with a continuity tester ?
Check the continuity from the diode and LED terminals through the ribbon
cable to the drive resistors and input buffer. The pin-outs and schematics
are in the construction pages.

Cheers,
Colin f



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