HEllo,
After several successfull prints suddenly the extruder temperature reading is wrong.
When in room temperature the extruder temperature reads 7 degrees, while bed temperature reads 20 degrees.
When i switch both temperature sensors of the bed and extruder the reading of the extruder is still 7 degrees.
When i turn up the heat of the extruder the readings go up so the sensor itself is working fine i guess.
So same sensor gives 7 degrees on therm1 and 20 degrees on therm 2. So i think there is something with the board.
Am i correct or can i try some other things to make sure it is the board?
Regards,
Erik
[quote=“ErikDijkstra”]HEllo,
After several successfull prints suddenly the extruder temperature reading is wrong.
When in room temperature the extruder temperature reads 7 degrees, while bed temperature reads 20 degrees.
When i switch both temperature sensors of the bed and extruder the reading of the extruder is still 7 degrees.
When i turn up the heat of the extruder the readings go up so the sensor itself is working fine i guess.
So same sensor gives 7 degrees on therm1 and 20 degrees on therm 2. So i think there is something with the board.
Am i correct or can i try some other things to make sure it is the board?
Regards,
Erik[/quote]
You could measure the resistance of the smd resistors neart the heater connectors.
With the thermistors disconnected, printer powered off and usb unplugged they should both read 4.7 kOhms.
What resistance do you measure on the disconnected thermistor plug (wire end) of the heater? should be baout 100kOhms at room temp.
The resistors are:
the one at Therm1 : 2.63kOhm
therm 2: 4.6kOhm
The thermistor is at 104k.
That is with everything disconnected, so measured therm1 and 2 on a completley loose board.
So i think the problem is the resisor at therm1. 
[quote=“ErikDijkstra”]The resistors are:
the one at Therm1 : 2.63kOhm
therm 2: 4.6kOhm
The thermistor is at 104k.
That is with everything disconnected, so measured therm1 and 2 on a completley loose board.
So i think the problem is the resisor at therm1. :([/quote]
Yes, looks like that.
If your board is still on warraty send it in for repair.
Otherwise you can try soldering a wires resistor in place of the smd one.
