Xerox WorkCentre 5790 Series, Service Manual

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May 2013
3-20 Xerox® WorkCentre® 5790 Family
IQ7, IQ8
Image Quality
Document Glass Checkout
Perform the following:
• Clean the top surface of the CVT glass and the document glass. Refer to ADJ 14.1 Optics
Cleaning Procedure (W/O TAG 150 ) or ADJ 14.2 Optics Cleaning Procedure (W/ TAG
150 ).
• Check the position of the document pad, ADJ 5.6 DADH Document Pad.
• Check that the white AGC strips on the document glass and the CVT glass are at the front
and underside of the glass.
Scanner Checkout (W/O TAG 150)
Perform the following:
• If the copy of the internal test is fragmented and displaced, check the following:
– The ribbon cable from the CCD PWB to the to the scanner PWB. Refer to Wiring
Diagram 15 .
– The harness connections from the CCD PWB to the single board controller PWB.
Refer to
Wiring Diagram 15 .
– If fragmented and displaced images appear in a regular pattern across process
direction, remove and re-seat all memory modules,
PL 3.24 Item 12 .
– If necessary, go to 03-330A, 03-462A Single Board Controller PWB to Scanner
Faults RAP (W/O TAG 150).
• Raise the DADH. Make a copy from the document glass. If the exposure lamp does not
illuminate, go to the
14D Exposure Lamp Failure RAP.
• Check the mirrors and exposure lamp for contamination, refer to ADJ 14.1 Optics Clean-
ing Procedure (W/O TAG 150 ).
Scanner Checkout (W/TAG 150)
Perform the following:
• If the copy of the internal test is fragmented and displaced, check the following:
– The ribbon cables from the CCD PWB to the scanner PWB. Refer to Wiring Diagram
18.
– The harness connections from the scanner PWB to the scanner daughter PWB.
Refer to
Wiring Diagram 16 and Wiring Diagram 19 .
– Reseat the scanner daughter PWB, PL 3.24 Item 20 .
– If fragmented and displaced images appear in a regular pattern across process
direction, remove and re-seat all memory modules,
PL 3.24 Item 12 .
– If necessary, go to 03-330B, 03-462B Single Board Controller PWB to Scanner
Faults RAP (W/TAG 150).
• Raise the DADH. Make a copy from the document glass. If the exposure lamp does not
illuminate, go to the
14-703B to 14-706B, 712B, 714B, 718B Failure To Calibrate RAP (W/
TAG 150) and perform the Exposure Lamp Check.
• Check the mirrors and exposure lamp for contamination. Refer to ADJ 14.2 Optics Clean-
ing Procedure (W/ TAG 150 ).
IQ8 Skew RAP
Use this RAP to determine the source of skew.
Ensure IQ1 Image Quality Entry RAP is performed before starting this RAP.
Initial Actions
WARNING
Ensure that the electricity to the machine is switched off while performing tasks that do
not need electricity. Refer to
GP 14 . Disconnect the power cord. Electricity can cause
death or injury. Moving parts can cause injury.
• Perform the misregistration procedure in the IQ2 Defects RAP.
Procedure
Enter dC606 . Use the internal test pattern 16 and select 1 Sided. Make 5 prints. Check the
prints for skew, IQS 5 Skew. The prints are skewed.
Y N
Use the internal test pattern 16 and select 2 Sided. Make 5 prints. Check the prints for
skew,
IQS 5 Skew. The prints are skewed.
Y N
Use a print of the internal test pattern 16 as a master and make 5 copies from the
document glass. Check the copies for skew. The copies are skewed.
Y
N
Use a print of the internal test pattern 16 as a master and make 5 copies fed
through the DADH,
Figure 1 . Check the copies for skew. The copies are
skewed.
Y
N
No skew is present. Re-define the image quality defect. Refer to
IQ1
Image Quality Entry RAP.
The skew is originating in the DADH. Go to ADJ 5.3 DADH Skew Adjustment.
There is a skew problem originating in the scanner. Complete a visual check of the
following:
• The mirrors are not loose and are held securely in place.
• The scan carriage is not damaged and moves freely.
• The scan cables are wrapped around their drive pulleys, refer to REP 14.10
Scan Idler Pulleys.
• If necessary, install a new scanner, (W/O TAG 150 ) PL 14.20 Item 1 or (W/ TAG
150 ) PL 14.10 Item 1 .
The skew occurs in the duplex paper path.
• Check the nip and drive rolls in the inverter assembly, PL 10.12 and PL 10.14 .
• Check the drive and idler rolls in the duplex transport, (35-55 ppm) PL 8.22 Item 7 or
(65-90 ppm) PL 8.20 Item 7 .
• Install new components as necessary.
Using the prints made from dC606 , check the prints for distortion by measuring between the
lines produced. The lines are parallel to each other.