Does anyone have a strong opinion on replacing old
parts on Prophet 5 or 10 like capacitors and 4000 series and 74LS series ICs. I
definately am replacing tantalum but are the highly populated .1uF Z5U caps Mica
or ceramic and do they really go bad? I understand mica is obsolete in terms of
current production so I am thinking to replace mica with ceramic if
this across the board rework happens. I have declared war on my P10 and plan to
replace all parts on the PCB3 board (computer board) like caps and logic ICs.
There is a guy with a nice website that states the logic IC technology was poor
in the 70s with a 6 micron fabrication process versus a current 0.7 micron
process that the reliability of the old chips were poor. I figure this is the
way to go first before I question the DAC71, which costs a fortune.
The way I look at it is it is a rework that probably is healthy for longevity. I
am not sure how to troubleshoot the DAC.
Message
Prophet 10 rework
2010-07-10 by Frank Simon