Tektronix Phaser 780 Color, Service Quick Reference Manual

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Service Guide vii
Contents
General Information 1
Phaser 780 overview 2
Memory considerations 3
Print engine assemblies 5
The image processor 10
Front panel 11
Rear panel 12
Network card LEDs 12
Specifications 14
Regulatory specifications 17
Safety 17
EMC 17
Energy Star certification 17
Error Codes and Messages 19
Troubleshooting 39
System power-up sequence 39
Print engine troubleshooting 40
Printer will not power up 40
Erratic printer operation 41
Making a print engine only test print 42
Printing and print quality problems 43
Initial checks and actions 43
Light (undertone) prints 44
Blank prints 45
Monochrome prints 46
Black prints 47
One color is faded 47
Missing band in direction of paper travel 48
Missing bands in parallel to the leading edge 49
Streaks in direction of paper travel 51
Streaks parallel with the leading edge 52
Banding 53
Edge of print is wrinkled with an area of ragged discoloration. 53
Random missing spots 54
Random spotting 55
Repetitive mark appears on each print 56
Residual image or ghosting 56
Background contamination 57
Unfused image or image easily rubs off of page 58
Toner on back of print 58