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From: dollas@uiuccsb.UUCP
Newsgroups: net.micro.cbm
Subject: Re: fuse problem with C64 - (nf)
Message-ID: <4477@uiucdcs.UUCP>
Date: Tue, 13-Dec-83 22:28:53 EST
Article-I.D.: uiucdcs.4477
Posted: Tue Dec 13 22:28:53 1983
Date-Received: Fri, 16-Dec-83 01:33:52 EST
Lines: 27

#R:ihuxv:-59700:uiuccsb:16800003:000:1572
uiuccsb!dollas    Dec 13 18:02:00 1983

   Though your problem boils down to the fuse, it might be a different one.
If you drive too many peripherals using your Commodore power supply, if you
have a bad chip (the latter may be undetected unless you do something the
actual chip is needed for !!!), or, finally, if you have power surges (the
power company may be in fault for a few, but usually this is not the
problem), you end up blowing the fuse. My opinion (which might not be of
use since I don't know your exact problem) is:
   (1) Check the number of peripherals that you drive. If you have (or you
can borrow) an ammeter find the current they draw. The maximum current ratings
are specified in your reference manual. Also,
   (2) Remove the keyboard, and with a new fuse turn on the Commodore (be sure
that before you turn it on, the keyboard is connected). Leave it like that for
a few minutes, and then "feel" the different chips. Excessive heat (I have
burned my fingers many a time on similar occasions) is a good indication that
the chip is drawing too much current. Make sure that you touch only the top 
of the chip and not the contacts.
   Both of the above are non-hardware approaches to the subject. If you 
have a chronic problem, probably it would be a good idea to service it in
an authorized shop.
   Good Luck!!!!!
                                               Apostolos Dollas
                                           Dept. of Computer Science
                                             University of Illinois
                                       (..!pur-ee!uiucdcs!uiuccsb!dollas)