4-12 Phaser 6250 Color Laser Printer Service Manual
Power Supply
Low-voltage Power Supply Overcurrent Protection Circuit
This circuit stops all outputs if the 24 VDC, 5 VDC or 3.3 VDC power supply is
shorted. The circuit is reset when the short is removed, the power is turned off and
then on again.
Low-voltage Power Supply Overvoltage Protection Circuit
This circuit stops all outputs if the 24 VDC, 5 VDC or 3.3 VDC power supply
exceeds the specified voltage. The operating point is 32 VDC or more for 24 VDC,
7 VDC or more for 5 VDC, or 6 VDC or more for 3.3 VDC.
Fan Output Circuit
For the Fan Rear ON (H) signal, the output voltage varies depending on the status of
FAN LOW signal and FAN STOP signal from the Fan Control circuit on the LVPS
(refer to "Power Supplies" on page 10-16).
+24 VDC Output Stopped By Interlock Switch
Opening Door A, B or C opens the front cover interlock switch. This shuts off the +24
VDC supplied by the Motor Driver Board to the motors, clutches and solenoids.
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