[sdiy] OT ?: Linndrum OS

[Gordon JC Pearce]

On Sat, 7 Jan 2012 10:18:11 +0100
Anders Sponton <anders.sponton at yahoo.se> wrote:

> I´ve got a strange problem with a Linndrum. I can select different songs but not patterns.
> It always start up at #11 and stays there.
> I can record and play back a sequence, but not erase parts of it.
> I´ve checked all the connections between relevant chips, the CPU got its power stable, clock and the rest. New NiMH batteries. I have replaced all chips around the CPU and memory select. Have also lifted off the OS chips (v 3.1) and the RAM chips and put them back again.
> I should test to replace the OS chips, but I can´t find any hex or obj files anywhere. 
> Are they out there somewhere?

I can't see how changing the OS chips would help.  If they had failed, nothing would work.

It sounds more like a stuck button, or one of the chips that handles the buttons.

-- 
Gordon JC Pearce MM0YEQ <gordonjcp at gjcp.net>