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Re: IIgs locking up after 15-20mins, TWGS likely overheating.
On 8/30/2010 2:23 AM, A2Aviator wrote:
There's a back issue of Juiced.GS that I covered this in.. and I'm
still convinced that the OEM power supply is just fine for all of it.
There is an inherent weakness in the assembly of the IIgs. All that
grounding is basically returned through two wires and that power
supply connector corrodes. Taking the connector on and off a few times
every so often helps that not happen, but if you see your connector
browning near the front edge (black/ground wires) you really need to
clean it off, on both portions which means popping the pins out of the
connector and re-tensioning them, cleaning it off with a scribe or
wire brush, etc.
I'm glad you mentioned the power connector, Tony. I thought about
reminding people to "clean" it (by unplugging and replugging a few
times) after I pressed "send". ;-) It would be particularly
implicated if people notice intermittent monitor or LED brightness
shifts when nothing else is happening. A good diagnostic would be
to reach in and wiggle the connector while the machine is on with
nothing else going on. The display should remain stable if the
connector is clean and tight.
IF you notice subtle intensity shifts in the image on the monitor when
you insert a disk .. this is probably why. Bad connections make the
thing work harder, and harder means more heat - a vicious circle.
The step load on the +12v caused by a disk drive operating is a
good indicator of poor supply regulation. This can result from
extra series resistance (the connector), or a marginal power
supply struggling to maintain regulation under increased load.
-michael
NadaNet 3.1 for Apple II parallel computing!
Home page: http://home.comcast.net/~mjmahon/
"The wastebasket is our most important design
tool--and it's seriously underused."