Xerox DocuPrint N2025 Service Manual page 342

Table 5 Signal names for the Print Engine Controller PWB<-->Laser path
Signal Name Description
/Laser CLK Clock signal to Laser MOTOR
/MOT ON (TTL) Scanner Motor Control signal that switches the Scanner Motor on and off
Low: On, High: Off
5VDC-LD Laser Diode drive power causing the Laser Diode to emit laser light. This
5VDC supply to the Laser Diode is interrupted by the deactuation of the LD
Switch in the Print Cartridge Sensor assembly.
VL1 Laser power control signal that determines (or adjusts) the current flowing
through the Laser Diode (analog signal)
VL2 Laser power control signal that determines (or adjusts) the current flowing
through the Laser Diode (analog signal)
MO Laser power monitor signal that feeds back the power of the laser light emit-
ted by the Laser Diode (analog signal)
/P. DATA (TTL) Print image data (Low=Black dot, High=White dot)
/SOS (TTL) Synchronization signal generated by the SOS Sensor that indicates the
start of each scan
• Print Cartridge Sensor Assembly function
The Print Cartridge Sensor Assembly has the Print Cartridge Switch and the LD Switch
mounted inside. The Actuator in the Print Cartridge Sensor Assembly is depressed by the
projection of the Print Cartridge to actuate the Print Cartridge Switch and the LD Switch.
When the Print Cartridge is not installed, the LD Switch is deactuated and opens the
5VDC-LD circuit, stopping laser light emission.
The LD Switch is the safety switch against the laser light. Never cheat the LD Switch to
avoid exposure to the laser light beam. Direct eye exposure to the laser light beam may
cause eye injury or blindness.
Wiring Data
Base Engine
WARNING
02/2000
7-12
Initial Issue
DocuPrint N2025/N2825