Upper Feed Roller

Before you begin, remove the following On the gear end of the roller, remove the E-ring securing the gear and slide the gear off the feed roller shaft. Slide the feed bearing off the roller shaft. On the right side, remove the E-ring securing the feed bearing and slide the bearing off the shaft. Remove the feed roller shaft by freeing one end then the other from the chassis frame.

Form Factor

To achieve a reasonably compact form factor, the tail end of the cassette has been designed to extend out from the engine footprint A . Consequently, the pickup rollers feed from the insertion end of the cassette B , similar to the LaserWriter II. This arrangement influences the architecture of the printer in the following ways. 1 Because pickup occurs deep within the printer, all mechanical drive elements are arranged vertically along the rear C , resulting in a simple C-shaped paper path....

All Blank Page

This condition suggests that the laser beam is not striking the photosensitive drum. Check for physical obstructions, especially sealing tape that has not been removed from the cartridge or something else just outside the laser scanner assembly. If this condition occurs only with a certain print job, make sure that some user-defined parameter such as magnification is not unintentionally placing the entire image off the area of the page. If the problem persists, refer the symptom, Blank Page or...

Toner Sensor Assembly

Before you begin, remove the manual feed sensor assembly. 1 Release the hooks on the back side of the toner sensor assembly and hold the assembly away from the bracket. 2 Remove the toner sensor cable from the cutout at the end of the bracket and lift the assembly free.

Sensing System Locator Printer Engine

Cartridge Sensing and Laser Scanner Interlock Sensor Cartridge Sensor Assembly P N 922-281 1 Actuator As the top cover closes, a tab on the toner cartridge presses an actuator in the cartridge sensor assembly. Fuser Assembly Full Stack Sensing A Sensor Part of Fuser Assembly Actuator P N 076-0653 Exit Sensing B Sensor Actuator Part of Fuser Assembly Manual Feed Sensor Assembly Toner Sensing D Toner Sensor Assembly P N 922-2799 Manual Feed Paper-Present Sensing E Sensor P N 922-2774 Acutator P N...

EPOST Error Codes

All LEDs on for a second, then off for a second, followed by a one-second display of S O SloswC Bli k ingEToner amp Jam LEDs 5 o Fast Blinking Toner amp Jam LEDs li SCSI Disk Error a l . u u Duplexer Error H Slow Blinking Toner amp Out LEDs S Fa Toner amp Out LEDs l DC Controller Board Error H l Toner Cartridge Missin9 u u or faulty cartridge sensor 922-2811 Top Three LEDs Blinking Fast q H.J Toner Cartridge EmptyQ u or faulty cartridge sensor 922-2811 Miscellaneous engine error includes paper...

Sensor

Before you begin, remove the manual feed sensor assembly. 1 Disconnect the cable going into the manual feed paper-present sensor and free the cable from the clamp. 2 Remove the brass-colored screw securing the black actuator holder to the assembly bracket. 3 Release the two hooks and remove the actuator holder from the bracket. 4 While protecting the actuator, squeeze the hooks on the sensor and remove the sensor from the actuator holder. Manual Feed Paper-Present Actuator Inside Manual Feed...

Miscellaneous

When the delivery tray is full of paper, the printer stops accepting print jobs and the controller reports an error message to the host computer. Sensing of delivery tray capacity is done through the full-stack sensor located just above the delivery rollers. With a duplexer installed, the duplexer full-stack sensor assumes this function. The parts used in the duplexer actuator and the printer actuator are not interchangeable. All other sensors and interlocks are similar to previous printers and...

Flashing Toner Paper Jam and Paper Out LEDs

Printer Cartridge Sensor

The errors conditions listed below are most frequently reported when an actuator on the toner cartridge fails to make proper contact with the sensor that detects the presence of the toner cartridge. When this condition occurs, the best solution is to replace the cartridge sensor 922-281 1 . Flashing low toner LED, indicating no toner cartridge is present Flashing paper jam and paper out LEDs, U2 ROS unit failure error reported To solve the problem 1 Locate the toner cartridge sensor. 2 Remove...

Top Cover Housing

Before you begin, remove the following 1 Using a small flat blade screwdriver, remove the ferrite core above and to the left of the DC controller board. 2 Disconnect connectors PI 2 and P17 on the DC controller board. 3 Remove the screw securing the grounding wire to the top of the chassis. Screw and Cable Clamp Cable Guide 4 Remove the screw and cable clamp located just behind the fan and remove the cables from the clamp. 5 Snake the two cables disconnected in step 2 through the cable guide in...

Right Top Cover

Before you begin, remove the fuser access cover. 1 Open the manual feed tray and the top cover. 2 Remove the two screws securing the right top cover to the printer frame one along the rear and one inside the manual feed compartment . 3 Lift the cover straight up and off the printer. Caution With the left or right top covers removed, fingers are no longer fully protected from the closure of the top cover. Whenever possible, keep the top cover closed. If you must work with the top cover open,...

Top Cover Interlock Switch

Before you begin, remove the following Disconnect J1 23 on the power supply and J21 on the DC controller board single orange wires and release the cable from the intermediate clamps. With the top cover propped open, remove the screw securing the interlock switch to the chassis. Pull the interlock cable through the cutout in the chassis and remove the interlock switch from the printer. Before you begin, remove the following Remove the two screws that secure the fan to the chassis and lift the...

Fuser Cover Interlock Switch

A safety switch that stops operation of the main motor, the laser scanner assembly, and the fuser whenever the fuser access cover is open. The switch is located on the right side of the fuser access cover opening. Print Density Adjustment Knob Service Access Side Print Density Adjustment Knob Service Access Side

Toner Stains on Printed Output

If the printer places a light dusting of toner on the printed page, if the toner is located in the center of the page, or, if there's a band of background toner that is three to four inches wide on the printed page, the fuser roller should be replaced. Note The band of toner always appears parallel to the direction of paper movement and appears to show a slight ghost image of items printed approximatley three inches earlier on the page. 1 Inspect the fuser roller for stains without removing the...

Right Cassette Guide Assembly

Before you begin, remove the following Remove the three screws securing the right cassette guide assembly. Press the three tabs at the bottom of the cassette guide and release them from the printer frame. Tilt the cassette guide, pulling its bottom edge from the inside of the Release the three upper hooks of the cassette guide from the frame and remove the cassette guide from the printer.

EPOST Extended PowerOn Self Test

EPOST behaves exactly like POST in that it checks the same three areas in the same order and displays an error array if a fault is detected. However, EPOST has more extensive testing and its error arrays are completely different. When a fault is detected during EPOST, all LEDs extinguish and the status panel will loop through the following sequence until you switch off power All LEDs On for approximately one second All LEDs Off for approximately one second EPOST Error Code for approximately one...

Cartridge Sensor Assembly

Scanner Mirror Clean

The cartridge sensor assembly houses the two switches below. Cartridge-present switch The signal from this switch stops printer operation when the toner cartridge is absent or the top cover is open. Laser-diode LD switch This switch opens the laser diode circuit when the toner cartridge is absent or the top cover is open. The LD switch protects users against exposure to the laser light. The toner cartridge consists of five major components. Photosensitive drum An aluminum cylinder with a...

Cassette Pickup Solenoid

Before you begin, remove the following 1 Remove the spring that connects the feed core to the chassis armature. Note This spring is a part of the spring kit P N 076-0647 . 2 Disconnect solenoid cable J204 from the left cassette guide assembly. 3 Remove the screw securing the cassette pickup solenoid to the chassis armature and remove the solenoid from the printer.

Paper Orientation

The paper path is wide enough to print letter or A4 sized paper in long-edge feed LEF mode. LEF mode is recommended as it achieves the fastest 20 ppm throughput and optimizes duplex printing. Note The cassette automatically senses paper orientation. The multipurpose tray does not. Printing in short-edge feed SEF mode from the multipurpose tray may produce undesirable results. Paper orientation and how best to load paper can be confusing, especially when talking with customers over the phone. It...

Right Cartridge Guide Assembly

Before you begin, remove the following 1 Open the top cover and hold it open during the operation below. 2 Remove the screw and the grounding spring. 3 Remove the five screws securing the rear left end and front left side of the cartridge guide. 4 From the board side of the chassis wall, press out the posts that secure the cartridge guide to the chassis and remove the guide from the printer

Lower Feed Roller

Before you begin, remove the following 1 On the gear end of the roller, remove the E-ring securing the gear and slide the gear off the lower feed roller shaft. 2 Slide the feed bearing off the roller shaft. 3 On the right side, remove the E-ring securing the feed bearing and slide the bearing off the shaft. one end then the other from the chassis frame.

Pickup Rollers

Rotate and feeds one sheet of paper each time the cassette feed solenoid is actuated. The manual feed guide tray is the pressure plate and width guide for manual feed paper. During standby the tray is held down by the pickup roller assembly cams. When the paper is about to feed, the cams move off the tray due to the rotation of the pickup roller assembly. The manual feed guide tray is therefore pressed up by the two pressure springs and the paper is pressed against the pickup roller. Part of...

Cassette Paper Present Sensor

Before you begin, remove the following cassette paper-present actuator to the rear direction so that the actuator is away from the cassette paper- 3 Use a small flat blade screwdriver to release the hooks of the cassette paper-present sensor, located on the inside of the printer frame work from the rear of the printer , from the left cassette guide assembly. Note Do not move the cassette paper-present sensor away, since it is connected with the feeder harness. 4 Disconnect P J205 from the...

End User Error Codes

Printer is ready after approx. 50 seconds . Printer is warming up or processing a job 1. Paper-Out and Paper-Jam LEDs flash alternately An error has been detected in POST. Observation of LED behavior prior to this array can isolate the fault to one of three general areas see POST . The top cover or fuser access cover is open. No paper or cassette is not installed. Printer is ready for sheet of manual-feed paper. Toner cartridge is not installed. Possible faulty cartridge sensor 922-281 1 1 If...

Service Test Page

Laserwriter 8500

Service Test Page T Test Page Button A service test page, sometimes called an engine test page, is a page whose description resides in firmware on the DC controller board. Successful printing of a service test page confirms the operation of the print engine. Of equal importance, if a print quality problem appearing on a normal page also appears on the service test page, the I O controller board is proven good and should not be swapped. There are two ways to print a service test page on the...

Paper Slides Back into the Exit Cover

If the paper exiting the printer slides back into the printer as shown below , the exit cover 922-2765 should be replaced. Refer to the Take Apart chapter in this manual to remove the part. The exit cover provided by service has been modified slightly to eliminate this problem. See the old and the modified new part below.