Heat bed or board
June 12, 2017 03:20PM
Hi guys half way through a 2 day print my heat bed stopped working.the print went cold and detatched from the bed. I was 8 hours from the end and I was a bit pissed off to say the least.
A wire had broke loose from the solder. I stopped the print and resolderd it back on and started the print again.
This time the bed is not heating so I checked the voltage with my multy metter and 0 volts at the bed so I checked the board output.
The hotend is 12 volts but the bed is 0 volts is my board dead or are there fuses or other replaceble bits like some sort of driver?
The board is a Geetech GT2560
Re: Heat bed or board
June 12, 2017 05:58PM
There are a surface mount fuses on the GT2560 the indicated one is for the bed

Re: Heat bed or board
June 12, 2017 08:37PM

Or as 2nd LITTELFUSE FAST ACTING SMD Fuse 1808 15A 65V

Edited 1 time(s). Last edit at 06/12/2017 08:50PM by Roberts_Clif.
Re: Heat bed or board
June 13, 2017 01:31AM
Thank you guys.
I'll give it a go.
Re: Heat bed or board
June 13, 2017 03:28PM
Hi guys just a update the fuses are all good so its the board at fault. Lucky I've got spare boards to tinker with. Anyone know for a diagram of the layout of parts on the board. you know witch resistors and components are for heating and so on.
Thanks guys
Re: Heat bed or board
June 13, 2017 06:12PM
sadly its closed source... no schematics..

but its the same idea as the ramps

atmega io pin -> mosfet gate to turn heated bed on and off
+ power threw the mosfet.

Only other thing you can do is replace the mosfet, anything more would require surface mount work..
Re: Heat bed or board
June 14, 2017 02:45AM
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