Lexmark W820 Service Manual page 331

BD7 Main Motor↔Interlocks SW1 & SW2↔I/O PWB
The following table shows the signal names for this BD:
Signal Name
FAN$LOW
FAN$FAIL
MMOT$ON
DMOT$ON
DMOT$REF
DMOT#PHS
MMOT$PWM
MC#CLK
+24VSQ
TNR#EMP
CRUM$PWR
CRU$CLK
CRU$#DATA
4025-XXX
Description
Switches speed of Fuser Fan. 5V=Low speed. 0V=High speed
Monitors Fuser Fan. 5V=Fan operation problem. 0V=Fan operation normal
Switches the Main Motor. 5V=On. 0V=Off
Switches the Drum Motor. 5V=On. 0V=Off
Drum Motor synchronize signal
Monitors Drum Motor. 5V=Motor operation problem. 0V=Motor operation
normal
Varies the Main Motor speed
Clock signal for the Main Motor
24V supply through the interlock switch
Monitors the signal from the Toner Sensor. 5V=Low level. 0V=Normal level
Switches CRU Memory
Clock signal for CRU Memory
Data signal for CRU Memory
5-25
Connector Locations