[sdiy] Roland Juno-106 Questions

[Needham, Alan]

|-----Original Message-----
|From: synth-diy-bounces at dropmix.xs4all.nl
[mailto:synth-diy-|bounces at dropmix.xs4all.nl] On Behalf Of Cory Scott
|Sent: 20 April 2010 00:52
|To: Synth-diy at dropmix.xs4all.nl
|Subject: [sdiy] Roland Juno-106 Questions
|
|Hey all,
|
|So today i picked up one of these for $99 not working and thought
|i could take a whack at it....
|so i crack this open to find...surprise power supply caps that 
|spewed all over the PSU..so i take out any suspicious looking 
|caps... i will replace all of them on the PSU later anyways....
|It also ate away at one of the diodes..diode D4 on the schematic
|labeled RD6.8 that ill have to replace, so i do some google...then
|some mouser and then some digi-key...nothing so i decided to come
|here to figure out what is going on with that.  some other things
|i have no idea where  the serial number i looked all over for it
|and i cant find it, i'm sure its somewhere thats going to make me
|look like a idiot later but you know... so i have no idea how to
|gauge how old this one is or any thing. 
|
|Thats all...for now,
|
|Thanks
|-Cory
|_______________________________________________

It looks like this zener is involved in holding a RESET until both
the +5v and +9v lines are up - a 6v8 low power zener should be OK,
it certainly isn't going to kill anything - at worst it will allow
a restart too early, maybe crashing on power-up.
#This RESET seems only to be used on the module board, not the CPU#
No idea on serial number!

HTH, Alan

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