Xerox 3150 - Phaser B/W Laser Printer, Service Manual

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Alignment and Adjustments
Service Manual 6-3
6.1.3 Self Diagnostic Mode
If an error appears, use the Self Diagnostic mode for fault finding as many safety features are disabled.
To Enter Self Diagnostic Mode:
a. Connect the DCU.
b.
Turn the printer ON while holding down the [Down], [Shift] and [Stop] at the same time.
c. Code 78 will now appear on the display, continue to hold the buttons for approximately 3 seconds until 00
appears on the display, and then release the buttons.
Running Tests from the DCU:
■
Use the [Up] or [Shift][Up] buttons to select the required test.
■ To start the test, press the [Enter] button.
■
To stop the test, press the [Shift] and [Enter] buttons together.
Code Description
00 Main motor operating system
The main motor is tested.
01 Main high voltage ON (MHV-)
-1550 voltage output to MHV terminal
Note Note Note
High voltage probe should not be used.
02 Transfer high voltage (-) on (THV-)
-1200 voltage output to THV terminal
Note Note Note
High voltage probe should not be used.
03 Transfer high voltage (+) on (THV-)
+1300 voltage output to THV terminal
Note Note Note
High voltage probe should not be used.
04 DEV/Supply high voltage
-430 voltage output to DEV terminal
Note Note Note
High voltage probe should not be used.
05 Laser operating system
The laser scanning motor is started and the ON LED is lit. When the laser motor is ready the 3rd
LED is lit.
06 Pickup clutch ON
Tests the Tray 2 solenoid.
07 Paper empty sensor test
The ON LED indicates the status of Tray 2’s paper empty sensor.