Xerox PHASER 8500 Service Manual page 284

Service Parts Disassembly
8-14
12. Disconnect the flex cable from the Printhead (Phaser 8400 printers have
two cables).
Caution
Do not pinch or tear the air hose while removing the Printhead as this will
damage the printer.
13. Lift the Printhead free of the printer chassis.
Replacement
The following replacement steps are basically the reverse of the disassembly
steps and provide important precautions. Perform these steps in the order
given.
1. Ensure that the Head Tilt Gear is in the home position (page 6-5).
2. Rest the Printhead on the cradle notches provided while reconnecting the
cable and flex connector.
Caution
Three types of Printhead Flex Cables have been used. One type provides
a locking ZIP connector. Ensure that the flex cable is inserted into the flex
connector on the Printhead fully and squarely. If the cable has the ZIF
connector, lock the connection. If the cable is not inserted incorrectly, it
can short out the Wave Amp.
3. Insert the ribbon cable fully and squarely into the flex connector.
4. Connect the data cable connector and heater harness connector.
Note
The Printhead heater cable not only needs to be routed through the cable
restraint, but also needs to be clear of the Printhead to prevent
interference which would result in errors 7009 and 4025 fault codes.
Caution
Before reinstalling the Printhead, move the wiper all the way down.
5. Lower the Printhead into its mounts. The Printhead should be tilted
forward in the print position.
Note
Remove any paper placed between the faceplate of the Printhead and the
Drum during disassembly.
6. Route the air hose through the frame and connect it to the purge pump.
Check that the hose is routed clear of the Left Printhead Restraint.
7. Install the Roll Block on the left end of the Printhead shaft. Position the
Roll Block as shown on the label on the left side of the frame.
8. Install the Left and Right Printhead Restraints. Tighten the screws to 6 in.
lb. to avoid stripping the chassis threads.
Caution
Ensure that the tilt spring on the left restraint is properly positioned in the
notch on the back of the Printhead and does not pinch the air hose.
9. Set the X-Axis Hook and spring on the end of the left Printhead shaft.
Ensure that the point of the hook is centered in the shaft and the rest of
the hook floats freely.
Phaser 8400/8500/8550/8560 Color Printer Service Manual