HP LaserJet 4 Service Manual - Page 117
Solenoids
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Solenoids Solenoids are controlled by the DC Controller. Each solenoid drives a specific roller (see Table 5-1). The DC Controller outputs +24B VDC to energize the solenoids at the proper time. When either of the doors are open, the +24B VDC is removed and the solenoids are disabled. Table 5-1 Solenoid Signals Solenoid SL1 SL2 SL3 Description PC tray (Tray 2) Pickup Roller Clutch Solenoid Multi-purpose (MP) Tray (Tray 1) Pickup Roller Clutch Solenoid Lower Cassette (LC or Tray 3) Pickup Roller Clutch Solenoid PCA Paper Control PCA (J704) Paper Control PCA (J702) Lower Cassette (J853) located in Lower Cassette Drive Assembly. See Chapter 8 for location. Figure 5-3 Printer Solenoid and Photosensor Locations Functional Overview 5-5
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 |
 |
Solenoids
Solenoids are controlled by the DC Controller.
Each solenoid
drives a specific roller (see Table 5-1). The DC Controller outputs
+24B VDC to energize the solenoids at the proper time. When
either of the doors are open, the +24B VDC is removed and the
solenoids are disabled.
Solenoid
Description
PCA
SL1
PC tray (Tray 2) Pickup
Roller Clutch Solenoid
Paper Control PCA (J704)
SL2
Multi-purpose (MP) Tray
(Tray 1)
Pickup Roller
Clutch Solenoid
Paper Control PCA (J702)
SL3
Lower Cassette (LC or
Tray 3)
Pickup Roller
Clutch Solenoid
Lower Cassette (J853)
located in Lower Cassette
Drive Assembly. See
Chapter 8 for location.
Table 5-1
Solenoid Signals
Figure 5-3
Printer Solenoid and Photosensor Locations
Functional Overview 5-5