Lexmark W820 Service Manual page 329

BD6 Printhead↔MCU PWB
The following table shows the signal names for this BD:
Signal Name
FAN$HI
FAN#FAIL
INTLK#FRONT
Printhead#SOS
RMOT$ON
RMOT$SP1
RMOT$SP2
RMOT#RDY
LD#POW
CRUDET
DA$DATA
LD$ENB
APC$CONT
4025-XXX
Description
Switches speed of LVPS Fan. 5V=Low speed. 0V=High speed
Monitors LVPS Fan. 5V=Fan operation problem. 0V=Fan operation normal
Monitors the Front Cover Interlock Switch. 5V=Cover close. 0V=Cover open
Monitors the Start of Scan
Switches the Printhead Motor. 5V=On. 0V=Off
Controls speed of Printhead Motor
Controls speed of Printhead Motor
Monitors the Printhead Motor. 5V=Motor operation problem. 0V=Motor
operation normal
DC power to the laser diode
Monitors the CRU. 5V=CRU installed. 0V=CRU not installed
Reference voltage used to control laser diode output level
Enables the laser diode. 5V=Enable. 0V=Disable
Clock signal used to modulate the laser diode output. 5V=Disable.
0V=Enable
5-23
Connector Locations