Analogue-sequencer

On Fri, 13 Aug 2004, Colin f wrote:

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

i took measurements with the multimeter, and though hard to pin down, the
measurements from the left column were significantly different from those
in the other two... i'm going to replace all the diodes just to make sure.

> Sounds more like it could be wiring problems.
> Difficult to tell from here...
> Have you got a multimeter with a continuity tester ?

i think so? :)

the orientation of the ribbon cable is all correct, i've triple checked
that.

> 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.

i will try that... thanks for your help! if this is the issue, could it be
that something is wrong with the IDC plugs attached to the cable?

also, the drive resistors are R6-13 or R14-17? and the input buffer is U12
or U13?

thanks!

bleep.
out.

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