All Rambo fuses blew again - any ideas?

[senake]

Hi All,

A bit of an update...on my post a couple of weeks ago where my Rambo blew all it's fuses and my PSU failed...

Having received the very expensive "little fuses" from Mouser, I plugged them into the Rambo and switched on the power - ALL of the Rambo fuses blew immediately - there was a blue flash from the 15A one - which seems to indicate a short. Luckily, the new PSU still works fine - possibly because it has built in short curcuit protection.

I have removed the Rambo and checked for damage, but there wasn't anything obvious. The last print seems to be firmly adhered to the borosilicate glass disc - even through the blue tape - which could have been because I forgot to reset the hot bed temperature - it was 5 degrees too high for PLA after printing with ABS.

I checked the resistance at the Rambo connection blocks - for the heated bed it was 1.2 ohm at room temperature and for the hot end it was 10 ohms.

Is there anything that could short out all of the fuses even before switching on the hot bed, hot end or motors?

Can anyone think of anything that I should check prior to fitting a new Rambo - to minimise the risk of damaging it?

Any thoughts would be very much appreciated.


Thanks



Senake