[sdiy] TR606 CPU?

[t at introspectiv.eclipse.co.uk]

Paul,

I have repaired a TR-606 in the past that required a 
new CPU. But, usually screwy symptoms in both the TR-
606 and TB-303 have actually been due to one or more of 
the memory ICs being bad. They die, meaning the 
sequencer just does strange things, and their I/O lines 
sometimes get stuck, resulting in 'stuck' LEDs. 

I have got a number of memory IC's for these machines 
in a drawer somewhere..

Trev

Quoting "Bennett, Paul" <P.Bennett at shu.ac.uk>:

> Speaking of 606's and the like. Ive just picked
> up a malfunctioning 606. All the voices play
> fine but the sequencer seems screwy. In
> pattern
> play mode I get 4 lights (in postions 1, 5, 9,
> 13) cycling through 4 steps. In patt write mode,
> nothing happens except it carries on cycling
> through as if still in play mode. Do you think
> its a dead CPU?  The clock seems to be running
> at the correct speed. Could it be a power
> regulator problem, messing the constant voltage
> to the CPU?
> 
> Many thanks guys 
> 
> B
> 
> UK
>