Xerox Paser 7400 Service Manual page 88

Troubleshooting Procedure Table
Step Actions and Questions
1 Check the following for evidence of fault,
dirt, debris, or damage:
Door C
Feed Rollers
Registration Rollers
Transport Rollers
Sensor Actuators
Is there any damage or debris?
2 Check the Option connection.
Is the Option connection to the Printer
damaged or disconnected?
3 Check the Option Harness continuity.
Disconnect OPTIF from the Engine Control
Board and the Option connector.
Is the harness conductive?
4 Test the tray sensors.
Run the Service Diagnostics Tray Switches
test for the appropriate tray.
Do the sensors function correctly?
5 Check the sensor harness continuity.
Is the harness conductive?
6 Test the Feeder Motors.
Run the Service Diagnostics Motor tests.
Do the motors function correctly?
7 Check the motor harness continuity.
Is the harness conductive?
8 Test the Registration Clutch.
Run the Service Diagnostics Clutch test.
Does the clutch function correctly?
9 Check the CL1 harness continuity.
Is the harness conductive?
10
Check for +24 V at the Motor Driver
Board's OPTRY24 connector.
1. Close the Interlock Switches.
2. Disconnect OPTRY24.
Is there +24 V at OPTRY24-1 and -2 <=>
ground?
3-14 Phaser 7400 Color Printer Options Service Manual
Yes
Clean or replace
the appropriate
parts.
Reconnect or
replace the cable.
Go to Step 4.
Go to Step 6.
Replace the
sensor. If the error
persists, replace
the Feeder Board.
Go to step 8.
Replace the motor.
If the error persists,
Go to Step 10.
Go to step 11.
Replace the clutch.
If the error persists,
go to Step 10.
Replace the
affected Option
Control Board.
No
Go to Step 2.
Go to Step 3.
Replace the Option
harness.
Go to Step 5.
Replace the
harness.
Go to Step 7.
Replace the
harness.
Go to step 9.
Replace the
harness.
Go to Step 11.