HMS 0700-2000-0002-0007: AMS Feed-Out Hall Sensor Disconnected
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HMS 0700-2000-0002-0007 means the AMS A Slot 1 feed-out Hall sensor is disconnected, and the message adds that the connector may have poor contact. That second half is the diagnosis: treat it as a plug before you treat it as a part.
The feed-out sensor is the one that confirms filament has left the slot. Without it the AMS will not commit to a load.
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Meter the run before you open anything else
A multimeter across the sensor harness separates a broken conductor from a connector that is merely loose, and it takes two minutes. Doing it first stops you dismantling three things to find the fourth.
Reseat, and re-crimp if the pin is loose
These are small JST-style plugs, and a pin that has backed out of its housing makes contact when stationary and loses it when the AMS moves. A connector kit with the right housings lets you remake the end properly instead of bending a pin back.
Protect the repair
Heat shrink over the joint and a little slack in the routing stops the same connector working loose again next month. Without that, you will be reading this page twice.
Then decide whether the sensor itself is dead
Clean plug, good continuity, still disconnected: that is the sensor, and it is an AMS service item rather than a bench repair. Which generation you have changes what is serviceable — see AMS 2 Pro versus AMS.
How HMS 0700-2000-0002-0007 pairs with the feed-in sensor
The sensor at the other end of the slot reports HMS 0700-2000-0002-0008. Reading which one the message names tells you which end of the slot to open, and that alone saves a full strip-down.
The third sensor in the same slot
The odometer has its own code in HMS 0700-2000-0002-0014, with the same wording about poor connector contact. If two of the three appear together, suspect the loom rather than three parts. The unit itself is described in printers with an AMS.
HMS 0700-2000-0002-0007 FAQ
Can I keep printing from another slot?
Usually yes. The fault is reported per slot.
What does the feed-out sensor do?
It confirms filament has left the slot on its way to the hub.
Is a reboot worth trying?
Yes, once. A transient fault clears; a loose plug does not.
Do I need to recalibrate afterwards?
No, but run a load and unload cycle to confirm the slot works.
Some faults are wider than one sensor. HMS 0700-2000-0001-0081 means the AMS could not read Slot 1 and names the main board, which is the one code in this family worth a slot-swap test first.
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