Xerox WorkCentre 5790 Series, Service Manual

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May 2013
3-37 Xerox® WorkCentre® 5790 Family
IQS 6
Image Quality
IQS 6 Copy / Print Defects
The printer should produce prints free of defects. Any defects not explicitly covered by this
specification should be considered as a fault.
Show through
No show through of the underside of the document handler should be visible when using Xerox
80gsm (20lb) or heavier paper as an input document. The check is made with the document
handler closed and in normal copy / print mode. Some show through might occur using 60gsm
(15lbs) paper as documents.
Oil on copies or prints
No oil should be evident on any print when viewed normally. Oil should not be visible on any
transparency when viewed using an overhead projector. It should be possible to mark fused
transparencies with a spirit based marker pen.
Dark spots
Dark spots are toner deposits in the background area of a copy / print. The specification for the
number spots and the size of the allowable spot size shown in
Table 1 . The specification is for
the total image area; document glass and CVT glass; and the whole of the imaged area on the
photoreceptor. To assess for dark spots use the internal test pattern number 1.
White spots
White spots are areas visible on a half tone or solid area where the toner has failed to be
deposited. The specification for the number and size of allowable spots is shown in
Table 2 .
The specification is for the whole of the imaged area on the photoreceptor. To assess for white
spots use the internal test pattern 5.
Skips and smears
Skips and smears are image disturbances that are assessed using the ladder scale, A. Use
one of the test patterns, 82E2000 (A3 and 11X17) 82E2010 (A4) 82E2020 (8.5X11). Refer to
Table 3 to assess image disturbances.
Paper wrinkle
Paper wrinkles which result in the loss of information are unacceptable at any level. In any
mode, copy / prints containing wrinkles or creases which do not result in the loss of information
may occur less frequently than 1 in 500 consecutive copies / prints in that mode. This is appli-
cable to all base line papers; to simplex and duplex prints, provided the paper is stored inside
the printer and that the printer is operated within the environmental specification.
Hole Punch Performance
The hole punch unit makes a set of holes near the trail edge of single copies or prints. The
dimension between the holes are set by the hole punch. The position of the holes from the trail
edge is controlled by the software that uses timing information from the punch sensor. The
specification for the hole positions in the top to bottom direction is +/-2 mm, with A4 / 80 gsm
(8.5x11, 75 gsm) simplex, from a single tray in a nominal environment. For all paper sizes,
weights, trays and environments, the specification is +/-3 mm.
Table 1 Dark spots
Spot diameter
Maximum number of spots per photoreceptor
circumference, 264 mm (10.4 ins) X width across process
direction
0.4 mm. and larger (1/64
inch) 0
No more than 2 sheets with more than 3 spots per 25x25mm
square (per square inch)
Table 2 White spots
Spot diameter
Maximum number of spots per photoreceptor
circumference, 264 mm (10.4 ins) X width across
process direction
0.4mm. and larger (1/64 inch) 0
No more than 2 spots in any 25x25mm area (1 square inch)
Table 3 Skips and smears
Magnification ratio%
Maximum number
disturbances
Test area of document
All magnification None Ladder scale A. 3 line pairs