Specifications

Chapter 4: Troubleshooting and General Procedures
4-22
The print engine recovery sequence
The recovery routine allows the printer to return to normal operation after a print cycle
interruption. The routine switches ON the main motor and signals the HVPS to switch ON CR
(DC) and TR (AC) voltages for the charge and transfer rolls respectively.
The printer uses the recovery routine after the following interruptions:
• Interlock switch deactuation
• Paper cassette removal
• Exit sensor actuation
The printer does not perform the recovery routine if either the exit sensor or the registration
sensor are actuated when you actuate the interlock switch, install the paper cassette, or switch
ON the power.
The Engine Self Test
An engine self test is available when the controller is removed, so remove the controller before
attempting to use the engine self test.
The self test will print a grid test pattern from the standard cassette tray. The self test only uses
the standard cassette tray so it must be installed and loaded with paper. Since the ESS
(controller) controls the control panel (LCD etc.) there are no messages.
Use the self test to determine if the controller is at fault. Perform the self test before replacing the
controller. The self test can also be used for printing accuracy and ROUGH print quality.
The engine self test is affected by connecting pin 2 of P/J52 to ground. You can complete the
short by using a wire or paper clip placed into a hole in the rear of the printer. To locate the
hole open the rear cover. The hole is 1.75 inches directly below the right edge of the parallel port
connector (if there is a label covering the hole: feel around and poke a hole through the
label. You may need to clear some of the label around the hole so the metal chassis is exposed
to use as a connection point to pin 2. Pin 1 of P/J 52 is ground so shorting pins 1 and 2 will also
affect the connection and the self test page. The wire should not go any further than .375 inches
inside the hole. It may take a few tries to get the short to occur.
Generating printer data = start page, error and hardware report
If possible, print the start page and error and hardware reports at the beginning of
troubleshooting. The start page will print upon power up if it has not been disabled. You can
print the reports by entering menu mode.Select REPORTS and move down the menu until you
see ERROR or HARDWARE. Select either option. The reports print from the standard cassette
tray.