npturton Posted July 19, 2020 Share Posted July 19, 2020 Hello All Managed to get back to my 8 bit stuff eventually I bought a new XL/XE 5v 2A PSU from ebay, connected to one of my 800xl and the unit will not switch on via the switch on the 800 (The 5v PSU is a Linksys from a Cisco switch - so quality shouldn't be an issue?) The only way I seem to be able to get this to work is to leave the switch on and then plug in the PSU, this powers up the 800 fine As soon as I revert to the switch, I doesn't come back on Would people recon this a switch issue? I don't understand though that if I leave the switch on its ok, resistance on the Switch or bad PSU? Please advise Quote Link to comment Share on other sites More sharing options...
Rybags Posted July 19, 2020 Share Posted July 19, 2020 800XL? Maybe the PS senses no load and goes into some sort of sleep mode? Can you measure it's voltage in load/no load situations? Quote Link to comment Share on other sites More sharing options...
npturton Posted July 19, 2020 Author Share Posted July 19, 2020 Not atm, left my multimeter at work ?, will have a look next week Quote Link to comment Share on other sites More sharing options...
_The Doctor__ Posted July 19, 2020 Share Posted July 19, 2020 other thing to check is solder on power jack legs to the PCB and switch cleanliness, give the switch a good cleaning. Does sound like a sensing power supply but we've seen this behavior with cracked solder joint to the jack before. Quote Link to comment Share on other sites More sharing options...
npturton Posted July 19, 2020 Author Share Posted July 19, 2020 ty Quote Link to comment Share on other sites More sharing options...
Voxel Posted July 21, 2020 Share Posted July 21, 2020 Initially I'd check the switch for soldering, if fine then suspect it's oxidised and apply some contact cleaner (or a very light oil) on the contacts. You may just want to try flicking the switch repeatedly ( a good few times in case it's just oxide) before you open to see if it clears up. It will not clear if a solder pad has dried and cracked during storage. Quote Link to comment Share on other sites More sharing options...
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