HP (Hewlett-Packard) LJ 4000T Printer User Manual


 
140 Chapter 3 Power supply EN
Protection systems
Problems on the load side, such as short circuits, can cause an
excessive flow of current from the DC power supplies or can generate
abnormal voltage. When this happens, the excess-current and
excess-voltage protection systems automatically shut off the output
voltage to protect the power supplies.
If the protection systems are activated and the power-supply circuit
does not output DC voltage, turn the printer off, correct the problem in
the faulty load, and then turn the printer on again.