Tektronix Phaser 840, Service Manual

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86 Phaser 840 and 850 Color Printers
6.
Check for
Service Required ...
errors. After installing the
printhead, you may get one of the following service errors due to mis-
adjustment or cabling problems:
■
4,002.41 and 4,006.45 errors: printhead NVRAM all zeroes. If the data
cable between the power control board and the printhead is not plugged
in properly or damaged, this error will occur. Reseat or replace the data
cable.
■
13,003.33 and 13,035.47 errors: A heater is running away. If the gray data
cable is not making a good connection, the incorrect data will be sent to
the main board. Reseat or replace the printhead ribbon cable before
replacing the printhead.
■
13,004.43 or 13,020.41 errors: The printhead jet stack is not heating as
quickly as it should. Readjust the left or right head-to-drum adjustment;
the printhead is too close to the drum, which prevents it from warming
up. If the error reoccurs after the adjustment, replace the printhead.
■
13,001.40 and 13,017.47: An open left and right jet stack thermistor.
Reseat or replace the gray data cable. If the error reoccurs, replace
printhead. If the new printhead gives the same error, replace the power
control board.
Damaged printhead data cable