Sensors And Forward/Reverse Switch Rap - Xerox 8830 Service Manual

1.5 Sensors and FORWARD/REVERSE Switch
RAP
Purpose
The purpose of this RAP is to isolate faults in the Edge Present Sensor,
the Edge Registered Sensor, the associated cables, and the Control
PWB. The 5.1 Document Transport/Registration BSD (Section 7)
contains useful information.
Initial Actions
Ensure that the Scanner and the controlling system are ready for normal
operation.
Procedure
Configure the system for diagnostic operation:
ES8150/XPC: (Section 6 of this manual).
8830 DDS: Section 6 of the 8830 DOS Service Manual
Select Component Tests. Select Input Tests.
Manually actuate the FORWARD Switch and then the REVERSE
Switch.
The signal goes low when the switch Is actuated, and high when
the switch is deactuated.
N
Go to Figure 3, Flag 1. Disconnect P2, and connect J2-2 to J2-4.
Observe the diagnostic screen.
The signal goes low.
Y N
B C
7356 Scanner
A B C
The signal goes low.
Y N
Replace the Control PWB.
Check the cable for an open circuit. Check the switch for continuity
when the switch Is actuated.
Manually actuate the Edge Present Sensor, and observe the diagnostic
screen.
The signal goes low when the sensor is actuated, and high when
the sensor is deactuated.
Y N
Go to Figure 3, Flag 2. Disconnect Connector P1. Connect J1-2 to
J1-4.
The signal goes low.
N
Replace the Control PWB (REP 4.1.10).
Replace the Edge Present Sensor and cable (REP 4.1.6).
c
Edge Registered
Sensor
Edge Present
Sensor
Figure 1. Location of Sensors
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1.5 Sensors and FORWARD/REVERSE Switch RAP