after test:
the power supply parts its ok
it delivers 5v and -10v at exit
I tested the circuit not bad track and all is ok
it is possible that program rom is death or the cpu
thanks


--- In tr-707@yahoogroups.com , "gregory zifcak" <foleymachine@...>
wrote:

>
> i had a problem like this with one, and couldn't figure it out. i
> think the cartridge light was yellow. i gave up eventually.
>
> good luck,
> greg
>
> --- In tr-707@yahoogroups.com , "yodavst" <yodad2r2@> wrote:
> >
> > hi all
> > i need your help for repair my tr 707 crashed
> > when turn On ,the cartridge led turn to the red or yellow
> > No display no sound no led
> > I've visually inspected the circuit board for
> > bad components, but everything seems to be good!
> > just some bad welding
> > after new welding the problem presist
> > when turn OFF the led 1,5,9,13 and pattern group turn to red
> >
> > thanks
> >
> > sorry for my bad english
> >
>