Other Problems; The Printer Continuously Displays "Initializing; No Toner Cartridge Installed Message When It Is - Tektronix Z740/N - Phaser 740 Color Laser Printer Service Manual

2.
Clean the rollers inside the auto-duplex unit.
3.
Inspect the duplex unit for foreign objects such as a shard of paper.
4. Does the auto-duplex unit's clutch operate correctly? Refer to "Service
tests" on page 57.
5. Inspect the auto-duplex unit's electrical connector for damage.
6.
Replace the auto-duplex unit.

Other problems

These problems may be indicated as errors on the front panel.

The printer continuously displays "Initializing"

The most likely cause is that the image processor has not loaded its EEPROM contents
(instructions) into RAM successfully. This is usually indicated by the health indicator
LED (heart beat) being on or off but not flashing. All print engine operation halts, and
will only become ready when the image processor has successfully booted.
1. Re-powering the printer, or perform a NVRAM reset.
2.
To verify if the image processor has failed:
a.
Power down the printer, and remove the back of the printer to gain
access to the ribbon cable connecting the image processor board to the
print engine control board; disconnect the ribbon cable at the control
board.
b. Power-up the printer. Wait at least 5 minutes while the print engine
initializes. If there was a problem with the image processor, it will now
not affect the print engine control board.
c. Check if the print engine is OK by pressing the print engine test print
button, you should get the parallel line test print. If not, then your
problem is most likely associated with the print engine control board,
and you will need to replace it. If, however, you get the print engine
test print, then your most likely cause is the image processor.

No toner cartridge installed message when it is

1.
Ensure that the toner cartridge is correctly installed.
2.
Replace the toner cartridge.
3. Replace the toner cartridge drive unit.
4. Replace the engine control board.
Service Guide
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