Turning on heaters causes 15A fuse to blow

[chrisnasulea]

Hello everyone,

I've just moved to a new house and brought my I3 Pro C with me. It was working perfectly before the move. The first time I tried to turn it on after hooking everything up it blew one of the 15A littlefuses on the board. I replaced the fuse, tried to turn on the heater for extruder 1 manually from Repetier Host and the fuse blew again.

I looked at various forums but I couldn't find anything useful.

Any thoughts?

[William]

Hi, you can check if 1.the wiring on the motherboard is correct.
                             2. Whether the thermistor is detached or caused by poor contact.

[chrisnasulea]

The printer was moved reasonably carefully from one apartment to the other so the wiring on the motherboard seems undisturbed.

Which thermistor are you referring to? There seems to be a bit of black colouring on the plastic surrounding the wires coming out of extruder 2. Maybe it was not there before, maybe it was.

IMG_20190610_124535.jpg (278.55 KiB) Viewed 7086 times

[William]

About the wiring of the hotbed and extruder and thermistor on the main board.

[_kaktus_]

Hi chrisnasulea.


I haven't seen you here in a long time.
It's a pity you only look when you're forced to.

William is right about the 15A fuse circuit, there must be a short circuit somewhere.
Your observation can be helpful in diagnosing a fault.

First try to disconnect this circuit and check whether the fuse will be blown again. If not, you already know where to look for a fault