909 problem (well 707 in my case....)

[Dearnley, Luke]

 Hi,

I had this exact problem with a 707. Turned out it was really easy to
fix.
The symptoms were identical: you could only work for a few seconds to
minutes before the unit blinked at you and reset. At first I thought it
was a touchy DC-power-in socket.... but experimental wiggling proved
that not to be so.
It was a dry joint in the connexion from one of the DC-power-in/battery
wires to the PCB. Somewhere in the past of this machine the batteries
had leaked shit all over the place and someone had replaced the battery
holder thingies and the wires. Unfortunately they had not done a very
good job of soldering to the PCB.... So what I initially thought was
gonna be some horrible to trace, loose logic chip problem (or something)
turned out to be essentially maechanical. The girl who the drum machine
belonged to was very happy.

:L uke, out.
Sub Bass Snarl Sound System
www.cia.com.au/peril

-----Original Message-----
From: mark verbos
To: Synth-DIY
Sent: 6/24/98 7:05 PM
Subject: 909 problem

hi there.

my 909 keeps turning otself off mementarily. like for
instance....

I will be working on something and all of the sudden all the
lights on it will turn off then it will come back, but in the
mode it powers up in. like to power went out for a second. since
none of my other gear is turning off I am assuming it to be the
909. so what could be the problem? electrolitics in the PS? any
ideas?
--
mark verbos

"I think the future of analog modulars is to build them
yourself."

verbos at on-q.com
http://www.on-q.com/verbos
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