Epson AcuLaser C4000 Service Manual page 630

EPSON AcuLaser C4000/C4100/C3000
P/J No. Signal line
P42-13 P12-18 FAN LOW
P42-12 P12-19 FAN STOP
FAN REAR
P166-2 *1
FAIL(H)+3.3VDC
P166-1 *1 FAN REAR ON(H)
NOTE: *1 Direct attachment to FAN REAR (PL.15.1.3)
LVPS (PL15.1.10) excess current protection circuit
All output is shut off when 24VDC/5VDC/3.3VDC supply voltage is shorted.
After the short is eliminated, reset the printer by turning the power OFF for
a small period of time and then turning it back ON.
Appendix
Description
Drive Control Signal for FAN REAR
(PL15.1.3)
Fail detection signal for FAN REAR
(PL15.1.3).
(High: Abnormal, Low: Normal)
ON/OFF Control Signal for FAN REAR
(PL15.1.3)
Wiring Diagrams and Signal Information
LVPS (PL15.1.10) excess voltage protection circuit
All output is shut off when an overvoltage condition occurs for 24VDC/
5VDC/3.3VDC supply voltage. The operation point at this time is 32VDC or
less for 24VDC, 7VDC or less for 5VDC, and 6VDC or less for 3.3VDC.
Reset the printer by turning the power OFF for a small period of time and
then turning it back ON.
FAN Output Circuit
Output voltage of the FAN REAR ON (H) signal changes according to the
FAN LOW signal/FAN STOP signal.
FAN LOW FAN STOP
High High
Low High
High
Low
Output Shut Down by I/L Switch
The "I/L +24VDC" circuit will be interrupted if the I/L Switch installed on the
PWB DRIVE (PL15.1.15) is switched to OFF. This condition will shut off the
+24VDC power to the PWBA MCU & HVPS (PL15.1.2) and the +24VDC
power to components connected to the PWB DRIVE (PL15.1.15).
Revision F
FAN REAR ON (H)
24V
15V
Low 0V
Low 0V
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