Marlin Temp Readings bouncing all over the place February 28, 2014 03:45PM |
Registered: 10 years ago Posts: 102 |
Re: Marlin Temp Readings bouncing all over the place February 28, 2014 04:27PM |
Registered: 12 years ago Posts: 258 |
Re: Marlin Temp Readings bouncing all over the place February 28, 2014 04:33PM |
Registered: 10 years ago Posts: 553 |
Re: Marlin Temp Readings bouncing all over the place February 28, 2014 05:53PM |
Registered: 10 years ago Posts: 190 |
Re: Marlin Temp Readings bouncing all over the place March 01, 2014 01:57PM |
Registered: 11 years ago Posts: 661 |
Quote
kfootball15
I.m having a wierd issue.
When I go to print or set the bed and hotend temps, the temp reading is all over the map. The temp will still rise, but itll jump from 32.8 to 31 to 28, back up to 35 to 33.8 to 30.1, back up to 39... etc etc etc.
Very strange. My thermostors seem to soldered and plugged in just fine...
Anyone else every had this problem?
Re: Marlin Temp Readings bouncing all over the place March 01, 2014 05:40PM |
Registered: 11 years ago Posts: 57 |
Re: Marlin Temp Readings bouncing all over the place March 02, 2014 12:15AM |
Registered: 11 years ago Posts: 661 |
Re: Marlin Temp Readings bouncing all over the place March 02, 2014 02:33AM |
Registered: 11 years ago Posts: 57 |
Re: Marlin Temp Readings bouncing all over the place March 03, 2014 06:05PM |
Registered: 10 years ago Posts: 102 |
Re: Marlin Temp Readings bouncing all over the place March 03, 2014 10:59PM |
Registered: 12 years ago Posts: 258 |
Re: Marlin Temp Readings bouncing all over the place March 04, 2014 02:50PM |
Registered: 11 years ago Posts: 57 |
Quote
kfootball15
I agree with Shawn above about PID tuning. It cannot be the problem as this printer was working perfectly fine a few days ago.
I am new to this for sure, but I did do a continuity test with a VOM and it seemed fine, but I re-soldered the connection just to be sure.
I just unplugged the thermistors from the electronics completely, and the temps STILL fluctuate rapidly (just at lower temps). What does that mean exactly?
Re: Marlin Temp Readings bouncing all over the place March 05, 2014 06:03PM |
Registered: 10 years ago Posts: 102 |
Quote
ShawnT98027
Quote
kfootball15
I agree with Shawn above about PID tuning. It cannot be the problem as this printer was working perfectly fine a few days ago.
I am new to this for sure, but I did do a continuity test with a VOM and it seemed fine, but I re-soldered the connection just to be sure.
I just unplugged the thermistors from the electronics completely, and the temps STILL fluctuate rapidly (just at lower temps). What does that mean exactly?
Hello kfootball15,
Frustrating, I know...
If your HE Hot End (heat resistor and thermistor) and the wiring check out with a continuity test... Then your good to go with these components.
Next I would... disconnect your HE wire connector (only the heat resistor wires; leave thermistor wires connected) from the PCB, power-up your machine, send the command to the printer to heat (e.g. via pronterface), check it to see if you have steady voltage (as tested with a VOM) coming out of your PCB from HE pins. If so, this does not mean you are in the clear with the PCB being good. Its' very possible if the PCB is outputting stable voltage to the HE pin connectors under little/no load (i.e. not attached to the heat resistor in your HE), that your PCB fails to produce a stable current to the HE under load (i.e. a compromised PCB connection that can not handle any real load).
At this point... I would pull the PCB, break out your magnifying glass, and carefully inspect your board for cold solder joints/cracks in the soldered connections to the PCB pad/via etc. Also look for any signs of brown discoloration, as this indicates also a bad unstable connection and will soon lead to erratic behavior and or PCB board failure. I HAVE SEEN THIS HUNDREDS OF TIMES OVER THE LAST 25+ Years, and is generally a simple fix of cleaning-up and re-soldering any bad connection found. Remember the HE heat resistor is a direct short, and this cause the heat resistor to heat, this load takes a heavy toll on all components within that circuit.
NOT Surprising, that your temp stability showing up more at lower temperatures.... lower temps (I assume your talking about low temps proceeding to your designated higher print temperature), well at this stage of the game your PCB is being told to put maximum throttle/power/voltage/load to the circuit to bring the HE to temp, to your meet your gcode or command (e.g. via pronterface Heater-Temp-Set). If you are using pronterface, you know that a cold HE being heated to print temp, shows a value in pronterfaces status (Monitor Print window) of @:127, once the HE reaches print temp, the PCB reduces the power/voltage/load to a minimal level to maintain the desired set print heat temp, and you will see much lower value than @:127. There is no magic or mystery in these 3D Printers/or any machines or electronics... it's all a matter of understanding them and using logical thinking to resolve issues.
Depending on the PCB Circuit design... one cold solder joint could cause a host problems. Identifying a cold solder joint Google Images - Cold Solder Joint. All your solder joints should be smooth, shiny and fully filled (not dull or crystalline in appearance, or having any hairline fractures or fill voids), I have seen PCBc that the whole board has cold solder joints or just one, either way it's trouble. I suspect your problem is a bad connection or cold solder joint on your PCB Print Controller.
I feel your pain, as I have been there myself.
Regards,
Shawn
Re: Marlin Temp Readings bouncing all over the place March 05, 2014 07:23PM |
Registered: 11 years ago Posts: 57 |