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136 Chapter 3 – Power supply EN
Overcurrent/overvoltage
There are two overvoltage devices in this printer:
• Fuse F101 provides overcurrent protection for the fusing-system
circuitry. Checking or replacing the fuse requires the removal of the
ECU. Fuse F102 (found only on 110 V units) provides overcurrent
protection to the printer DC power supply circuitry.
• In addition, the +24 VDC, +3.3 VDC, and +5 VDC power circuitry
contains an overcurrent protection circuit that automatically shuts off
the output voltage when an overcurrent condition occurs as a result
of a short or an abnormal voltage on the load side.