@oneceporuk, Welcome to the HP Support Community!
Thanks for reaching out about your query regarding your HP MFP M442 that does not start!
We're thrilled to have the opportunity to assist you and provide a solution.
It looks like you're dealing with error #C3-1414 and a "scanner locked" message, along with a lack of sound from the printer’s fans or motors. Given that there’s no 24V output from the power supply (JC44-00223G), it makes sense to investigate whether the SMPS (Switched-Mode Power Supply) is functioning correctly.
To answer your question about the 24V output—yes, there should typically be 24V present when the printer is powered on. However, the manual mentions "24V ON/OFF" on pin 2 of CON4, which suggests that the power is controlled via a signal rather than being constantly supplied.
Regarding the instruction about "less than 1," the wording can be a bit unclear. In this case, it likely refers to voltage rather than a logical "1" signal. If the voltage on pin 2 is below 1V when checked, it usually indicates a faulty SMPS that needs to be replaced.
Here’s what you can do next:
Double-check the power source– Ensure the printer is receiving stable power from the outlet.
Measure pin 2 on CON4– If it reads less than 1V, it strongly suggests the SMPS is defective.
Inspect the scanner lock– Some models have a physical scanner lock mechanism; make sure it isn’t engaged.
Let me know if this works!
Take care, and have an amazing day!
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Regards,