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Phaser 8400/8500/8550/8560 Color Printer Service Manual 4-55
General Troubleshooting
Unplanned Shutdown
If the printer was not shutdown by the power switch the last time it was turned
off or it was shutdown with ink on the drum:
As soon as the printer has warmed up, the media path motor moves the wiper
to the bottom of its travel and the process motor moves the printhead to the
print position a chase page is sent through the paper path to clean ink from
the drum.
Temperature Below Purge Threshold
If the Printhead, ink reservoirs, or jetstack temperature are below purge
threshold, the printer performs a Printhead cleaniong cycle.
1. The printer waits for the printhead to reach its purge temperature.
2. The printer moves the wiper to the bottom of its travel and tilts the
printhead forward to its print position to check the ink levels. If the ink level
is low, ink is melted into the appropriated reservoirs.
3. The printhead tilts to the standby position and moves the wiper assembly
to the purge position in front of the printhead faceplate.
4. The purge pump begins the pressure purge after about 2 seconds the
purge pump solenoid opens.
5. The printhead tilts forward against the wiper assembly (wipe position) and
the purge and wipe cycle begins.
6. The Control Panel indicates the printer is performing the cleaning
process.
7. The printhead is moved left to the tilt zone, where the printhead can tilt
back without interference, and the media path motor moves the wiper to
the bottom of its travel to engage the printhead tilt cam. The process
motor rotates the printhead tilt gears, which tilt in order to move the
printhead to the forward print position.
8. After the print engine is in a known, valid state the Control Panel display
shows the warm-up progress (the Ready LED flashes). When warm-up
completes, the Ready LED displays solid.
9. The temperature of the printhead, drum and paper preheater are allowed
to stabilize at their operating temperatures and ink is melted if needed.
10. The printhead is homed to the print position for printing.
11. A cleaning page is printed at this time, if a purge was performed.
12. A start page is printed (if enabled).
13. The Control Panel displays a message that the printer is initializing and
then ready.
14. The print engine is initialized and is ready to print.