User`s guide

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From: Rubywand
009- Why do so few GS power supplies have a fan
installed?
Most users depend upon System Saver GS to handle cooling because the GS
case is not designed to take advantage of an internal fan. With a fan mounted on
the power supply, you can, mainly, blow air around inside the case. The fan is
not much good for drawing in cool air from outside or pushing hot air out.
Another problem is noise-- both the kind produced by a fan when its
bearings begin to go and electrical noise which degrades the quality of sound
output. The fan uses the +12V pins which are needed for simple installation of a
popular sound digitizer card. A fan mounted on the PS case could prevent
plugging long circuit boards into Slot 1 and, possibly, Slot 2.
Perhaps, as Charles Plater seems to suggest, there is some reason for an
internal fan. Mounted on the power supply (which is the only place a mounting
point is available), a fan could blow some air into the power supply.
Supposedly, this could extend power supply life.
Still, many users have 11 year-old GS's with original power supplies which
continue to work fine with no internal fan.
Basically, a PS-mounted fan in a GS appears to be the cure for a problem
which has yet to be discovered.
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010- What are some good Apple II power supply fix tries?
Apple II power supplies can often be repaired. The bother involved varies
considerably with the cause of malfunction.
Note: The following refers more or less directly to II+ and IIe supplies;
however, many of the ideas will work with the IIgs power supply as well.
Note: Unless otherwise indicated, power should be turned OFF.
A Short
Open the case and check inside for indications of Coke spills, debris,
etc.. If everything looks okay, continue on. If not clean away the mess; it
could be causing a short. After cleaning (and drying), turn ON the power to see
if the problem is fixed.
Pull all cards from Slots and turn ON power. If the machine 'comes alive'
one or more of your cards may have a short or may have been cross-socketed.
Clean the contacts on each card (e.g. with alcohol). With power OFF, replug a
card (be sure to line-up card and Slot contacts) and turn ON power. Do this for
each card. If a card causes the machine to fail, it is, probably messed up. If