Xerox PHASER 7500 Service Manual

5-54 Phaser 7500 Printer Service Manual
Print-Quality Troubleshooting
IQ-25 MWS (Side 2) (Micro White Spots)
When the resistance in the Secondary Transfer section is high, e.g. in the early
mornings (low humidity environment), the transfer latitude between multi color
and mono color is narrow and the setting voltage favors multi color. In other
words, the voltage is a little high for mono color, and this causes the Transfer NIP
discharge phenomenon that creates the white spots.
Cause
• Occurs on Side 2 in a low humidity environment.
Initial Actions
• Check the paper transfer path.
• Ensure there are no debris on the transfer path.
Troubleshooting Reference
Applicable Parts Example Print
Troubleshooting Procedure
Step Actions and Questions
1 Verify that the micro white spots appear on Side 2 in a low humidity
environment.
2Perform Calibrate for Paper procedure.
Normal
Abnormal
Micro White Spots

Xerox PHASER 7500 Specifications

General

Max Print Resolution	1200 x 1200 dpi
Monthly Duty Cycle	150, 000 pages
Standard Paper Capacity	550 sheets
Duplex Printing	Optional
Standard Memory	256 MB
Network Connectivity	10/100/1000Base-T Ethernet
Supported Operating Systems	Windows, Mac OS, Linux
Max Paper Capacity	2, 100 sheets
Connectivity	USB 2.0, Ethernet
PDL	PostScript 3, PCL 6, PDF
Print Speed	Up to 35 ppm