[sdiy] Juno 60 repairs

[Bob Weigel]

Remember to check the status of chip enable on the memory chips too at 
powerdown.  If they are staying on...then that's where your battery is 
going.  They run tons more current when CE is selected.  Someone with 
the diagrams handy can hopefully tell you which pin to check there. -Bob

Altitude wrote:

>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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>______________________________________________
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>
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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.
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