Solenoids
Table 1-2 Solenoids
Component abbreviation Component name
SL1 Primary transfer roller disengagement solenoid
SL2 Duplex reverse solenoid (HP LaserJet Enterprise 500 color M551dn and HP LaserJet Enterprise
500 color M551xh only)
SL3 Multipurpose-tray pickup solenoid
SL4 Cassette pickup solenoid
Clutches
Table 1-3 Clutches
Component abbreviation Component name
CL1 Duplex re-pickup clutch (HP LaserJet Enterprise 500 color M551dn and HP LaserJet Enterprise
500 color M551xh only)
Switches
Table 1-4 Switches
Component abbreviation Component name
SW1, SW2 5V interlock switch
SW3 24V interlock switch
SW4 Power switch
Test print switch
6 Chapter 1 Theory of operation ENWW