I still have another issue with the printer. Now when I start printing something after a few layer I get a z-axis failure. I will try and see if I can post the error.
]]>//Decouple Test feature, do not disable it unless you know what you are doing!!!
//if you have decouple issue it means you have hardware issue or bad air flow management!!!
//this feature is a safety feature, if you disable it is dangerous!!!
#define FEATURE_DECOUPLE_TEST 0You can disable the decouple test in FW, it may help you to see where/when printer behavior is wrong when heating
How do I do that?
]]>so looks like the heater is fine. reading is 3.8 ohms. Any other thoughts? what should be my next steps in figuring out this issue?
Well, that's sortof unfortunate since it would be the cheapest thing to replace. Sounds like your board is bad. Maybe someone else has a board they are willing to sell or you can convert it to a RAMPS or some other board.
]]>The light stays on constantly
Then that's probably just an indication light that the board is receiving 12 volts from the source and has nothing to do with the heater circuit.
I will check resistance of the heater tonight. What Ohm range am I look for?
If it's a 25 watt heater, it will be 5-6Ω
for a 40 watt heater, it will be 3-4Ω
You want to look for a short circuit (around 0Ω) or an open circuit (no connection; infinite ohms; your meter will read OL or similar)
]]>Thank you!
]]>I'm not sure how the davinci board works, but the board should supply 12V at the heater terminal UNLESS it has a failsafe to check resistance of the circuit, and ONLY when the heater is supposed to be on (12V = nozzle hot). I would doubt it has that sort of failsafe though. The light on the back beside the heater plug... does it only come on when you put the printer into nozzle cleaning mode or does it stay on constantly?
]]>If the heater unit in the extruder is bad will the circuit still try to apply 12V to the harness?
]]>Can this still be a firmware issue?
If the heater worked at all, even for a minute after the firmware was flashed, then it's not the firmware.
Since I don't own a davinci printer, it's hard to me to suggest what you should do. If you wanted to check the heater, you could check its resistance. To do this, set your meter to ohms (Ω) and touch the leads of your meter to each of the two wires going to your heater. Make sure the heater is disconnected from the board so you don't pick up the resistance of the circuit. You should get 2-6Ω depending on the type of heater you have.
This will narrow the problem down to the heater or the board.
]]>Can this still be a firmware issue?
]]>(1) You're having a problem with the extruder heater.
(2) You are getting an error "Heater Decoupled"
(3) All this started immediately after you flashed the firmware
Given this, I am inclined to say that all of your boards and heaters are fine, and that there is a problem with the firmware. Carl pointed this out in his post.
... If it has never worked are you sure you made the correct changes in Repetier before you flashed. This board is the newer board so the regular 1.0 settings in Repetier will not work. There are settings that have to be changed in the configuration.H file near the top for the correct model printer. The boards are different and the outputs have changed on them so the firmware has to be changed depending on the board.