After finally fine tunning the 3d Printer and printing some parts for it I have a problem with Therm2/Heatbed. The temperature is stuck at 60 degrees, this stays the same after I unplug the connector to the board. If I switch Therm2 to Therm1 and turn on the heatbed it shows the correct temp (under the extruder, though) and it increases as it gets hotter. So it is not the NTC under the heatbed, I have also checked the resistance and I get 4.5k to 4.7k on Therm1’s resistor, but on the resistor for Therm2 I get 0.17k to 0.3k. I have a resistor in my junk collection that is 472(measures 4.75k). Can I replace the one on the board with this one? I know it will void my warranty, but after buying this printer 1 month ago, I have only gotten to use it 5 days, the rest was spent adjusting/taking it apart and putting it back together (a bad design if you ask me, too many parts are hard to get to), or waiting for parts:
Hot end - IT BROKE (surprise surprise!)…waited for part to be replaced
1 Stepper Motor driver - Never worked…again waited…
1 toothed pulley - it was very poor quality (not centered)…again I waited
These were replaced of course by the US Vellman people. AND OH JOY IT WORKED…FOR 5 DAYS!
Sorry for the long post, but I am building another printer and I just need it work so that I can print parts necessary for the new one and dump this one on somebody else or use it for spare parts. Time to throw my time and money on some other 3d printer.
It measures 102-112 k.at the NTC under the heatbed and connectors on the edge of the heatbed…so the NTC is good, like I said before. 4.7k ohms is the resistance for the smd resistor under therm1 and .3k~ for the smd resistor under therm2…unplugged and unconnected from the heatbed/hot end ntcs. Thanks for your reply.
I checked and everything looks good. In fact it was working for 5 days, therm2 was reading the correct temperature. Now that I think about it, I was changing the belt holder to an adjustable one for the y axis and had to lift the heatbed and lean it against the wall. At one point it slid toward the motherboard and hit the corner where the Therm connectors are. But I had it unplugged and should not have created a short on the resistors. Anyways, is the Vellman support guy/gal here? Can somebody just answer if I have to use the same resistor type or can I replace it with one that has just a bit more resistance? I can use the printer but with no heat…or at least I can turn it on, but have to keep watch and turn it off and on myself…and this is really not a safe way to do prints…don’t want to damage anything or create some fire hazard.
Ok, took the 4.7k smd resistor under therm2, was going to replace it, but when I tested it out of circuit it read exactly 4.70. So I looked at the board to see if there was a bridge somewhere but nothing. Checked the two pads with out the resistor under therm2 and keep getting the same 0.13k (no Power) checked the other resistor under Therm1 getting 4.72K. I soldered the resistor back and getting the same 0.13k. Looks like the problem is somewhere else. (Scratches head looks around, coughs nervously and puts head down and slowly raises arms and head to the heavens). Oh great gods of technology please help me!. It looks like I have to return this back to the vendor.
By the way, before taking out the resistor I tried the following:
Reset the board
Re-installed Marlin
Re-installed Repetier Host
Sent the G-Code M562 P0 (bed)
Tried the forum…still waiting.
All resulted in no solution.
Currently all the motors are good, fan good, hotend good, extruder good, heatbed works, stop sensors work, only Therm2 sensor does not work and my brain is crapping out too. I have read the forum posts and I am not the only one who has gotten this error (therm1 or 2), and the solution was to send the board back. Can someone figure this one out at all!? At least for curiosity’s sake.
When I unplug the Therm2 connector the temp stays the same at 60 degrees. Sorry for the delay in my replies, I am in Canada and can only reply right after work.
If you unplug therm 2 and the temp stays at 60C this sounds like a problem in the board.
Do not change anything on the board this will void the warranty
Since you are in Canada you can send an email to tech support at vellemanusa dot com
