Functional Overview
DCController/Power System
Overcurrent/Overvoltage Protection
The +12V dc and +5V dc power circuits each contain an
overcurrent/overvoltage protection circuit which automatically
shuts off the output voltage when an overcurrent condition occurs
due to a short or abnormal voltage on the load side. The protection
circuit automatically resets after the input power is cycled OFF
then ON.
Fuse FU101 provides overcurrent protection for the Fusing System
circuitry. Fuse FU201 (not present on 220-240 V units) provides
protection in case of a catastrophic overcurrent condition in the DC
Controller power supply regulation circuitry.
Intelligent ON/OFF (LaserJet 4L/4ML only)
This printer feature conserves power by shutting down all the
printer’s front panel LED status lights after a 15 minute period of
inactivity. The printer retains all printer settings and downloaded
fonts and macros while in Intelligent Off mode. The lights power
ON instantly when any of the following occur:
e A file is printed.
@ The front panel button is pressed.
. The printer’s top door is opened.
. Paper is inserted into the manual feed slot.
● A paper cassette is removed or installed.
Note –
The printer will not enter Intelligent Off mode if
there is a printer error.
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