On Thu, May 25, 2017 at 9:11 PM, Mike Stein <email@example.com> wrote: > I assume the fuse does not blow when the supply is disconnected from the > computer? Voltages OK? > > Relatively unusual that a chip would blow the fuse; I'd check the caps > first, especially any tantalums. I have a 6569R1 that instantly blows the fuse on a C64 (this chip gets +12V and +5V from a separate 7805 inside the C64). But I agree, it's best to first test capacitors. Even a bypass ceramic could get shorted. Frank > > ----- Original Message ----- > From: Terry Raymond > To: firstname.lastname@example.org > Sent: Thursday, May 25, 2017 2:38 PM > Subject: C128 problem > > Hi, > My C128 has a problem with blowing the fuse in the power source what could > cause this? > > This C128 is dead, black blank screen, C64/C128 modes won't work, nothing > She's completely dead. > > I was told to check all logic chips, can this be done with a meter or logic > probe, does this require and voltages on Logic chip pins? > > I found jnfo on how to build a simple logic probe, maybe a different post > later since this > Has something to do with TTL/CMOS LOGIC OR LS logic, very interesting. > > Terry Raymond > Message was sent through the cbm-hackers mailing listReceived on 2017-05-25 19:00:02
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