Atari 800XL powering on issue

[npturton]

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

[Rybags]

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?

 

[npturton]

Not atm, left my multimeter at work 🤪, will have a look next week

[_The Doctor__]

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.

[npturton]

ty

 

[Voxel]

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.