Symptom: All Four Colors Are Solid Black; Symptom: All Four Colors Are Extremely Faded - Tektronix Phaser 750 User Manual

Symptom: All four colors are solid black

Prints are black (edge to edge).
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Solution:
Remove then re-insert the Main Charge Grid. If problem persists,
replace the Main Charge Grid.

Symptom: All four colors are extremely faded

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Phaser 750 Color Printer