Tektronix Z740/N - Phaser 740 Color Laser Printer Service Manual page 39

Print engine service error codes
Error code
82
83
84
28 Phaser 740 Color Printer
Meaning of error code and what to do about it
Serial time-out error.
1. Check the connection between the image processor board and
the engine control board.
2. Replace the image process board.
3. Replace the engine control board.
Command error. The image processor sent bad data to the
engine control board.
1. Reset the image processor NVRAM.
2. Check the connection between the image processor board and
the engine control board.
3. Replace the image process board.
4. Replace the engine control board.
Parity error.
1. Reset the image processor NVRAM.
2. Check the connection between the image processor board and
the engine control board.
3. Replace the image process board.
4. Replace the engine control board.