I agree with Kent, I have done the CMOS/decoupling cap job before with no problems. The circuits in the CS-80 are not critical enough to be worrying about switching speeds. Look for broken wires, bridges, cracked tracks, and if you find nothing then look for a fault unrelated to the re-chip, because sometimes coincidences do happen. Also, if you are doing things like measuring the resistance of CMOS switches, remember that the chips do not like having voltages applied to their pins if the chip itself is unpowered.
________________________________
From: mborish_2000 <
mborish_2000@...>
To:
yamahacs80@yahoogroups.comSent: Tuesday, January 20, 2009 12:19:54 PM
Subject: [yamahacs80] Re: Replacing all CMOS 4000 Series Logic IC's
It might. Some of the older chips took forever to switch. I haven't
seen a datasheet for the original 4000 series Toshiba IC's. I'm going
to do that next. The new 4000 series chips have much lower internal
resistances.
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