[sdiy] Juno 60 repairs

[Altitude]

No holder, just a solder in job.  It was doing the same thing before I
replaced the battery so that's why I suspect something else is causing the
problem.  


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-----Original Message-----
From: owner-synth-diy at dropmix.xs4all.nl
[mailto:owner-synth-diy at dropmix.xs4all.nl] On Behalf Of Roy J. Tellason
Sent: Wednesday, May 18, 2005 4:00 PM
To: synth-diy at dropmix.xs4all.nl
Subject: Re: [sdiy] Juno 60 repairs

On Wednesday 18 May 2005 03:41 pm, Altitude wrote:
>  So my Juno is starting to have memory problems (it does not hold 
> memory after being turned off) and has a new battery.  Should I 
> replace the
> uPD444C-1 memory chip?  Chipforbrains has them with TA7179 regulators 
> as a bundle so should I replace both if I am going to open it up?

I'd make it a point to measure what that battery is doing.  I don't remember
the Juno 60 offhand,  is that one in a holder?  (One of the things I used to
do is replace those soldered-in units with tabs with little holders to make
it easier and to support them better -- this was a real problem with tabs
breaking in stuff like the Octapad boxes.)

Measure the battery _in circuit_.  If it's low then measure how much current
is being drawn,  if you can do so conveniently.  Sometimes it's convenient
to use an xacto knife and cut traces to figure out where the problem is,  or
unsolder a jumper wire,  or similar,  easy enough to fix afterwards.