Re: [sdiy] TR606 CPU?

[Roman]

if anything is cycling, CPU can't be dead.
I'd search for broken traces. It's delicate device,
so any hit into switch knobs might break the PCB.
It happened to me.
Check transistors Q 403-Q410 on switch board
if they are pulsed, and if CPU pins 33-34 see
pulses in variuos mode switch positions.
If you see no pulses there, trace the signal
untill you find where it gets lost. May be
faulty transistor or broken wire etc.
hope that helps

Roman

---- Wiadomość Oryginalna ----
Od: "Bennett, Paul" <P.Bennett at shu.ac.uk>
Do: synth-diy at dropmix.xs4all.nl
Data: Fri, 20 Jun 2003 10:25:05 +0100
Temat: [sdiy] TR606 CPU?

>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
>