User manual

95.08.23.11.31
Color LaserWriter 12/600 PS Basics & Theory 1–145
Remote Switch
When the power switch on the printer is turned off, the power supply
circuit sets the power off signal (
POFF) sent to the DC controller to
“H.” When the printer is subsequently ready to be turned off, the DC
controller sets the power off control signal (
PCONT) to “L.” This stops
the switching regulator for the power supply circuit and turns off the
printer.
This indirect shutdown of the printer allows the transfer drum to be
parked in the home position and allows for excess heat to be exhausted.
Protection
Function
The power supply circuits for +24 VDC and +5 VDC have an overcur-
rent/overvoltage detection function which is activated if some problem
has occurred. If this function is activated, it automatically shuts off the
output voltage to protect the power supply circuit. If no DC voltage is
output from the power supply circuit because the overcurrent protection
function has been activated, turn off the power switch (SW1), discon-
nect the power cable, rectify the problem with the loads, and then turn
on the power switch again. Do not turn on the printer for about two
minutes after turning it off. If overcurrent flows in the AC line, the
circuit breaker on the circuit is turned on to shut off the output voltage.