On Tue, Jun 27, 2023, 12:34 PM Jon Elson via cctalk <cctalk@classiccmp.org> wrote:
> On 6/27/23 09:42, Jonathan Katz via cctalk wrote: > > Hey folks, > > > > Now that I'm done moving house I have time to wrench on the 6150. > > Before moving it worked; you'd power it on, the LCD status countdown > > would get to an OK value, but the CRT wasn't legible. I figured I'd be > > wrenching on the CRT. > > > > Instead, now when I power it on, it powers on for a second or two and > > then shuts off. I'm assuming this indicates a short or power-draw > > somewhere. I've reseated the CPU and RAM cards, the peripherals, and > > unplugged the hard drives (2x ESDI) and floppy in case they had a > > fault that was drawing too many amps and causing the power supply to > > shut-down. I noticed nothing on the CPU or RAM boards (exploded caps, > > etc.) > > > > What should I look at next? > > > I would plug it in to the same place it was working to confirm a known-working supply source longer works. I'd this is not conveniently possible try a plug that has zero load on it. Eliminate the new variable (new socket in new location) before start changing caps like its a home.computer. the RT has a sophisticated power supply. There may be redundancy built in as well. Bill >
