What's a "Mean-Well module"? I somehow find myself imagining: "I put a new module in my router. It blew up. At least it meant well" :-)
(My IGS has the rather heavy and over-engineered divider shelf with the main board underneath and the fan and power supply above.) Regards, Peter Coghlan Jonathan Chapman via cctalk wrote: > > With that much carnage, I'd probably drop a Mean-Well module in there. I > believe there would be enough room for one or two in the IGS I have > (taller white box, divider "shelf" over the mainboard, I don't know if > there was a lower profile model). > > Thanks, > Jonathan > > ------- Original Message ------- > > On Saturday, February 5th, 2022 at 09:17, Phil Blundell via cctalk > <cctalk@classiccmp.org> wrote: > > > On Thu, Feb 03, 2022 at 06:06:10PM +0000, Peter Coghlan via cctalk wrote: > > > > > Today I finally managed to check it out. The ceramic F4A mains input fuse > > > > > > beside the power switch on the back panel had blown. When I opened it up, > > > > > > I found a POWER-ONE MAP80-4000 power supply. The main chopper transistor > > > > > > labelled Q1 on the PCB is almost a dead short. It is a large plastic > > > > > > packaged FET mounted on a piece of aluminium which is in turn screwed to > > > > > > the case for heatsinking. Unfortunately, there are no markings on it so > > > > > > I have no idea what to replace it with :-( > > > > > > As Q1 is shorted across all three terminals, whatever drives it may be > > > > > > damaged too :-( > > > > Does that PSU have a PWM controller IC, or is it built entirely from > > discretes? > > > > If there is an IC driving the chopper transistor then you may be able to get > > > > some clues about the likely characteristics of the transistor from the IC > > > > datasheet. Is it definitely a FET? Some, particularly older, designs used > > > > bipolar transistors there. > > > > As you say there is a fairly high likelihood that other components on the > > > > primary side will have blown up as well so you might be looking at a fairly > > > > extensive repair. Are there any other obscure, unmarked devices or is this > > > > the only one? > > > > p. >
