¶ Error message
HMS_0300_0A00_0001_0003 The sensititvity of heatbed force sensor 1/2/3 is too low
" The sensitivity of heatbed force sensor 1/2/3 is too low. The electronic connection to the sensor may be broken. "
These error code below shows the same problem of different force sensor:
0300 0A00 0001 0003
0300 0B00 0001 0003
0300 0C00 0001 0003
¶ What it is
Before sensing the force that applied on the hotbed , the printer with measure the sensitivity of each force sensor, after the measurement , the printer will then check if the sensitivity of the force sensors are normal , if not, the error will presented.
Below are the possible reasons that may make the force sensor sensitivity too low
- The hardware connection between the MC board and the hotbed is off:
- The hotbed signal cable connector on the MC board side was loosen
- The hotbed signal cable was damaged;
- the Z-axis motor is malfunction :
- The connector of the z-axis motor is loose from the MC board;
- The Z-axis motor is burned down;
- The force sensor is malfunction.
¶ Safety warning and Machine state before starting operation
Make sure the hotbed has been cooled down and the ground wire of the power plug is truely connected to the ground
¶ troubleshooting guide
¶ step 0 - turn the power OFF
turn OFF the printer , and disconnect the power cord.
¶ step 1 - Remove screws
Remove the 10 screws and 4 screws from the rear cover shown in the picture. There are 2 types of screws, so keep them separate and remember which ones go where.
¶ step 2 - Remove the rear cover
Remove the rear cover, unlock the left side belt tension ports first and then the right side one, to avoid getting stuck.
¶ step 3 - check hotbed signal cable connector
As shown below , the hotbed signal cable connector is "J2613" , pointed by the red arow:
Check if each connector of each wire of the hotbed cable is loose. If it is loosened , re-insert it ;
If none of the wire connector is loose, clean the glues around the whole connector , then re-plug the whole connector.
Then power on the printer, try home again, to see if this error disappeared
¶ step4
If step3 does not work, then the force sensor might be broken, and need to be replaced. See "Replacing the hotbed force sensor".