All about the Roland Jupiter-series

-----Original Message-----
From: Mark R. Strijbos
Subject: [AH] Disabling Jupiter-4 Write-Protect ?


Dear Loggers,

Last week i have bought a Roland Jupiter-4 (at last! my first Jupiter)
and it's one hell of an analog dream machine with an incredible rich and 
deep tone. But i received this synth in "kit form" and when i re-
assembled it, i accidentally used a long screw in the wrong place. This 
damaged the signal flow on the Patch Selector PCB thereby disabling 
the (left-most) Write Protect override button. 
So now i can't write to the (expanded) patch memory banks anymore!

Of course the obvious solution would be to "bridge" the offending 
signal path on the PCB, but i can't reach the trouble spot because the 
PCB and switch array are mounted to the front panel with a tiny screw 
situated on the inside of the row of switches - it's really baffling me 
how they ever assembled this BTW - so i can't pry it loose.

However, there are also three blank wires running to the Write Protect 
section on the top (component) side of the PCB. Now my guess is that 
these wires carry the signal to & fro the Write Protect button and could 
probably be bridged to permanenty disable this part of the circuit and 
_enable_ memory writes again.

Is there anybody out there with some "hands on" JP-4 experience?
Any help (hints, tips, diagrams, schematics, spare parts) would be 
greatly appreciated




Mark Strijbos

[JP-4 JU-60 MS-20 MS-404 D-10 TR-606 MC-303 OCTAPAD-II]