¶ What it is
HMS_0700_4000_0002_0001: The filament buffer signal lost, and the cable or position sensor may be malfunctioning.
When using AMS, the buffer (or AMS Hub) is connected between the AMS and the printer.
It has a slide, a spring, and a hall sensor. When the AMS pushes the filament into the tool head extruder, the slide will move forward due to the pressure of the filament. The hall sensor can then detect the displacement and location of the slide, and feedback that signal back to the AMS and the printer. If the buffer signal is lost, AMS will not be able to feed the filament smoothly.
¶ Troubleshooting
¶ 1. Check&Reconnect the 6pin cable
Usually, this is a 6P cable issue; please check whether the Pins of the 6P cable are open:
And try reconnecting the 6-pin cable:
¶ 2. Check the AMS internal connections
- If the problem persists, check if the bus cable inside the AMS is loose:
- It is recommended to replug the bus cable and try to load the filament again, to see if it can be recovered so that we can narrow the fault to the bus cable.
¶ 3. Measure the voltage & resistance
1. If you have a multimeter, please unload the filament back to AMS and check the slider of the AMS buffer is on the left side as shown below：
- Then measure the voltage between the pins of the 6Pin cable (unplugged from AMS).
- The normal voltage should be as follows. Make sure the buffer slider is back to the left side, otherwise the voltage value will be different.
| pin-pin | Voltage |
| GND-Buffe_A | 0.5~1.0V |
| GND-Buffe_B | 2.8~2.3V |
and the sum of the two voltages is 3.0~3.3V.
2. If the voltage measured in the previous step is in the normal range, the problem may be on the AMS side. Please measure the resistance of the 6-pin cable(plugged into AMS). Normal resistance values are as follows:
|
pin-pin |
Resistance |
|
GND-Buffe_A |
4~6 KΩ |
|
GND-Buffe_B |
4~6 KΩ |
- If the measured resistance values are abnormal, please disassemble the AMS and measure the resistance of Buffer A and B to GND on the AMS mainboard. The normal range is 4 ~ 6 KΩ. If the resistance values are abnormal, the AMS mainboard is faulty.
- Then check the connectivity between buffer A and buffer B on the AMS mainboard and the corresponding pins on the 6-pin cable (plugged into the AMS). If the connectivity is abnormal, there is a problem with the AMS power board and it needs to be replaced.
Please follow the above steps to test, record the test results, and contact the customer support team for further assistance.
¶ Error message:
HMS_0700-4000-0002-0001: The filament buffer signal lost,the cable or position sensor may be malfunctioning.
0700-4000-0002-0001
¶ End Notes
We hope the detailed guide provided has been helpful and informative.
To ensure a safe and effective execution, if you have any concerns or questions about the process described in this article, we recommend submitting a Technical ticket regarding your issue. Please include a picture or video illustrating the problem, as well as any additional information related to your inquiry.