HMS 0700-2000-0002-0008: AMS Feed-In Hall Sensor Disconnected
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HMS 0700-2000-0002-0008 means the AMS A Slot 1 feed-in Hall sensor is disconnected, which may be due to poor connector contact. It is the mirror of the feed-out code, and the end of the slot it names is the end you should open.
Feed-in is the sensor that sees filament arriving from the spool. It is the first thing the slot checks when you push a new reel in.
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Open it with drivers that fit
AMS covers use small recessed fasteners and plastic clips, and a slipping bit rounds a head you then have to drill. A precision set with properly sized tips is the difference between a tidy job and a scarred shell.
Handle the plug with tweezers, not fingers
These connectors sit in tight recesses where fingers simply push them sideways. ESD tweezers let you lift the latch and pull straight, which is the only way a small plug comes out undamaged.
Actually look at the pins
A splayed or recessed pin is invisible at arm’s length and obvious under magnification. A head-mounted magnifier leaves both hands free, which matters when one of them is holding a housing apart.
Then reseat and test with a reel
Push a reel in and watch whether the slot acknowledges it. That is the test this sensor exists to pass, and it takes ten seconds.
How HMS 0700-2000-0002-0008 relates to the feed-out code
The other end of the same slot is HMS 0700-2000-0002-0007. Both say disconnected, both blame the connector, and both are opened from a different side of the unit.
When the motor is involved too
If the feeder motor is also silent you will see HMS 0700-2000-0002-0013, and two dead items in one slot means a shared loom. The layout is covered in the AMS hub guide and the generations compared in AMS versus AMS Lite.
HMS 0700-2000-0002-0008 FAQ
Which end is feed-in?
The spool side, where filament enters the slot.
Why do both sensors fail together sometimes?
Because they often share a loom or a board connector.
Can I swap slots to test?
Yes. If the fault stays with the slot, it is wiring on that slot.
Is this a warranty repair?
If the connector is sound and the sensor is dead, raise it with support.
Not every slot failure is a sensor. HMS 0700-2000-0001-0083 means the RFID tag on the spool may be damaged, which is an adhesive label rather than a service part.
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