HMS 0C00-0300-0001-0009: First Layer Inspection Module Rebooted
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HMS 0C00-0300-0001-0009 means the first layer inspection module rebooted itself. One of these after a firmware update or a power blip is noise and needs nothing from you. A pattern of them points at power quality, electrical noise or a connector, in that order.
The printer is reporting an internal restart it recovered from, which is more information than most machines give you.
Where to buy
Count them before you act
Write down when they happen. One reboot a month is not a problem to solve. Three on the same long job, or one every time the heaters kick in, is a pattern and a pattern has a cause worth finding.
Electrical noise is the overlooked cause
Stepper drivers and bed heaters throw noise onto every cable near them, and a data line that picks it up can take a subsystem down with it. Clip-on ferrite cores on the camera and signal leads cost a few dollars and are the cheapest thing in this article that actually works.
Then measure the supply
A printer sharing a circuit with a compressor or a workshop heater sees the voltage sag every time that thing starts. A multimeter across the outlet while the other machine cycles turns a theory into a reading, and a reading is what tells you whether to move the printer or stop guessing. The generic detection failure with the same free remedies is HMS 0C00-0300-0002-0013.
If you are going to reseat anything
Earth yourself first. An anti-static wrist strap is the difference between reseating a camera connector and quietly damaging the board behind it, and the damage from a static discharge does not announce itself at the time.
Why HMS 0C00-0300-0001-0009 is worth noticing
A module that reboots mid-job is a module that was not watching for part of that job. Nothing breaks, but the check you are relying on had a gap in it. The same gap, from a different cause, is HMS 0C00-0300-0002-0018.
Its neighbours
A module that comes up but cannot report in time gives HMS 0C00-0300-0002-0005. A camera that fails to initialise at all gives HMS 0C00-0400-0002-0026. This code sits between them: it failed, and then it recovered.
HMS 0C00-0300-0001-0009 FAQ
Did my print survive?
Almost always. The module restarted, not the printer.
Should I update the firmware?
If you are behind, yes. Module stability is exactly what these releases touch.
Is one reboot worth investigating?
No. Investigate patterns, not single events.
Could a cable cause it?
Yes, and a connector that was disturbed during other work is the commonest version.
A module that reboots and a module that loses step have the same short list behind them. HMS 0C00-0100-0001-0003 is the synchronization case, and there is no setting for it — only firmware, noise and power to rule out.
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