Of 99-4 Generic Solenoid/Clutch Rap - Xerox DocuColor 2240 Service Manual

OF 99-4 Generic Solenoid/Clutch RAP

Solenoids and electric clutches are essentially electromagnets. Typically, a positive voltage is
applied to one end of a coil, and a current driver is connected to the other end. Control Logic
switches this driver to GND potential, actuating the magnet. Bi-directional solenoids have a
bipolar driver connected to each end. One leg is switched to 24 VDC and the other to GND.
Figure 1 is a circuit diagram of a typical solenoid.
Initial Actions
Ensure that there is no damage or binding in the solenoid or in any mechanical linkage. If there
is an Adjustment for the clutch or solenoid, make sure that the procedure was performed cor-
rectly
Procedure
The clutch/solenoid is always energized.
Y N
Enter the component control code (dC330) given in the RAP or the Circuit Diagram. Press
the Start button The Clutch or solenoid energizes.
Y N
Press the Stop button There is +24 VDC between the switched leg (J407 pin A6
in the example, Figure 1) of the control PWB and GND.
Y N
There is +24 VDC between the powered leg (J407 pin A7 in the example,
Figure 1) of the control PWB and GND.
Y N
Disconnect the connector (J407 in the example,
VDC between the powered leg of the control PWB and GND.
Y N
Refer to the 24 VDC wirenets. check the input power to the control
PWB. +24 VDC is present.
Y N
Use the 24 VDC wirenets to troubleshoot the problem.
Replace the control PWB.
Check the wire in the powered leg of the circuit, (J407 pin A7 in the exam-
ple, Figure 1) for a short circuit to GND. If the wire is OK, replace the
clutch or solenoid.
Disconnect the connector (J407 in the example,
through the two wires and the clutch or solenoid. There is less than 100
ohms between the two legs of the circuit.
Y N
Disconnect the clutch or solenoid.Check continuity through the two wires
and the clutch or solenoid. There is less than 100 ohms across the
clutch or solenoid.
Y N
Replace the clutch or solenoid.
A B C D E
Status Indicator RAPs
OF 99-4
A B
The clutch or solenoid appears to be functioning correctly. Refer to the Circuit Diagram for
the RAP that sent you here. Check the wires for loose connections or damage that may
cause intermittent operation. Perform any required adjustments.
There is a short circuit on the switched leg (J407 pin A6 in the example) from the solenoid or
clutch. Check the wire for a short circuit to GND. If the wire is OK, replace the solenoid. If the
problem persists, replace the controlling PWB.
Figure 1). There is +24
Figure 1). Check continuity
02/03
2-518
C D E
One of the two wires between the control PWB and the clutch or solenoid
is open. Repair or replace the wiring as required.
Replace the control PWB.
Press the Start button. There is less than 1 VDC between the switched leg of the
control PWB and GND.
Y N
Replace the PWB.
Replace the clutch or solenoid.
Figure 1 OF 99-4 RAP Circuit Diagram - Typical Solenoid/Clutch
Initial issue
DC 3535/2240/1632