Re: RIP 46 Message #5 Posted by Tony Duell on 22 Dec 2010, 3:54 a.m., in response to message #4 by Keith Midson
You can get schematics from the Australian Museum site.
I would start by taking off the top and bottom covers and then look for obviously burnt or damaged componets. Yes, some faults do leave a visible trail!. But remember that the burnt part may have been damaged by a fault elsewhere.
Continue by unplugging the transformer secondary edge connector from the back of the logic PCB. Replace the fuse with one of the correct rating and apply mains. If the fuse blows, then you have shorted turns in the mains transformer :-(. If the fuse holds, check the secondary winding voltages.
Then check the PSU components on the logic PCB. Others have mentioned the smoothing capacitors (the value is not too critical, if you can't find a 5000uF, don't worry, a 4700uF is fine). Also check the rectifier diodes (I've had problems with these in other machines) and the pass transistors.
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