Overcurrent/overvoltage protection
The low-voltage power supply automatically stops supplying the DC voltage to the printer components
whenever it detects excessive current or abnormal voltage.
The low-voltage power supply has a protective function against overcurrent and overvoltage to prevent
failures in the power supply circuit. If an overcurrent or overvoltage condition occurs, the system
automatically cuts off the output voltage.
If DC voltage is not being supplied from the low-voltage power supply, the protective function might be
running. In this case, turn the printer OFF, unplug the power cord. Do not turn the power switch ON until the
root cause is found and corrected.
WARNING! If you believe the overcurrent or overvoltage protection circuits have been activated, do not
plug in the product power cord or turn on the product power until the cause of the failure is found and
corrected.
In addition, the low-voltage power supply has one power supply fuse (FU101) to protect against overcurrent.
If overcurrent flows into the AC line, the fuse blows to stop AC power.
20 Chapter 1 Theory of operation ENWW
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