Xerox WorkCentre 5790 Series, Service Manual

Page: 707 / 1610

May 2013
3-11 Xerox® WorkCentre® 5790 Family
IQ2
Image Quality
– If both the print and the copy are completely black, go to the 06-350 ROS Laser Not
Under Control RAP.
– If only the print is good, but the copy is black, go to the 14-703 to 14-706, 712, 714,
716, 718 Failure To Calibrate Entry RAP and perform the Exposure Lamp Check.
– For other black images, go to the IQ3 Xerographic RAP.
• Blank image. Perform the following:
– Insert a door cheat and make a copy. At the same time use a flashlight and illumi-
nate the photoreceptor between the developer and the xerographic module. Check
the following:
If the copy is completely blank, go to the IQ3 Xerographic RAP.
If the copy has a dark band go to the 06-340 ROS Laser Failure RAP.
If the blank images are additional output. Go to the OF8 Multifeed RAP
– Check the developer drives:
1. Remove the xerographic module, (35 ppm) PL 9.22 Item 2 or (40-90 ppm) PL
9.20 Item 2 .
2. Make a visible bald patch on the developer roll by moving the developer brush.
3. Re-install the xerographic module.
4. Enter dC330 code 04-010 main motor, MOT04-010. Run MOT04-010 for
approximately 5 seconds.
5. Remove the xerographic module, (35 ppm) PL 9.22 Item 2 or (40-90 ppm) PL
9.20 Item 2 .
6. Check for the visible bald patch on the developer roll. If the patch is still visible,
check the drives to the developer,
GP 7 .
– If 09-060 faults are in the fault history log, go to the 09-060 HVPS Faults RAP.
• Blurred image. Check that the documents are flat on the document glass. Use a new
ream of paper. Check the transfer and detack corotrons wires are secure and taut. If nec-
essary perform the following:
1. Install a new transfer / detack corotron, (35 ppm) PL 9.22 Item 8 or (40-90 ppm) PL
9.20 Item 2 .
2. The xerographic drum may be heat damaged by fuser temperature control prob-
lems. Look for the indicators that follow:
– Characters on copies/prints are bold, thick and smeared looking (burred, out of
focus).
– An inspection of the photoreceptor reveals a yellow/green haze on the drum
surface.
– The top photoreceptor seal, which is normally white, may be yellow/brown,
curled and shrunken.
– Make a print of internal test pattern 5, refer to dC606 . The defect can some-
times be a fairly well defined darker band approximately 25mm (1 inch) wide
running from inboard to outboard on the photoreceptor. Other times it may not
be a well defined and there may be more than one defect area on the drum.
– There may be 10-315 or 10-320 faults in the fault history file.
The cause of this fault is the fuser lamp coming on and staying on in standby, the
excessive heat damages the drum, due to an intermittent fault. Perform the actions
that follow:
a. Install a new xerographic module, (35 ppm) PL 9.22 Item 2 or (40-90 ppm) PL
9.20 Item 2 .
b. Perform dC132 NVM Initialisation and select the All Copier MVN routine. Do
not save/restore NVM to/from the machine resident diskette because this may
restore corrupted NVM. However if the NVM on the machine resident diskette
was saved from a time when the machine did not have the fault, then and NVM
restore should be performed.
c. If the problem continues, Install a new fuser module assembly, PL 10.8 Item 1
(35 to 55 ppm) PL 10.10 Item 1 (65 to 90 ppm).
d. If the problem continues, perform the OF7 IOT PWB Diagnostics rap, before
installing a new IOT PWB, PL 1.10 Item 2 .
e. If the problem continues, Install a new fuser connector assembly, PL 4.10 Item
9 (65 to 90 ppm) PL 4.15 Item 9 (35 to 55 ppm).
f. If the problem continues, Install a new LVPS and base module PL 1.10 Item 3 .
• Dark prints. Go to the IQ3 Xerographic RAP.
• Deletions. Check the following:
– If the deletions are on the duplex side of a print or copy, go the IQ5 Print Damage
RAP. Also refer to the white lines defect.
– Intermittent (1 in 50 to 1 in 400 copies) irregularly-shaped deletions positioned near
the centre of the leading edge, and on either side of the print. This type of deletion is
known as Cockle deletion, refer to
IQ13 Cockle Deletion RAP.
– If the deletions are small spots, this can be caused by beads on the image. Refer to
the beads on print defect.
– If the deletions are faded or deleted areas on the outboard area of prints and copies
and installing a new xerographic module removes the defect, but it returns within
2500 prints/copies and the defect gets worse over time, check the ozone system, go
to
OF6 Ozone and Air Systems RAP.
– Go to the IQ3 Xerographic RAP.
• Displaced and fragmented image. Check the following:
– If the machine is lower than 750 metres (2461 feet) above sea level, go to the IQ3
Xerographic RAP.
– If the machine is higher than 750 metres (2461 feet) above sea level, check the
transfer / detack assembly for arcing. If necessary go to
dC131 NVM Read / Write
location 09-098 Altitude. Check the value is correct.
– Refer to IQ7 DADH, Document Glass and Scanner RAP. Perform the IQ7 Scanner
Checkout.
– Refer to OF10 Intermittent Failure RAP and perform the Electrostatic Discharge
Checkout.
• Grey images. Dark grey images too dark or light images too light. Go to ADJ 9.2 Image
Quality Adjustment Routine as an initial action. If ADJ 9.2 fails to solve the problem, go to
ADJ 9.5 Optimize Dark and Light Grey Image.
• Light images. Go to the IQ11 Light Copies RAP.
• Lines. Perform the following:
– If there are dark lines in the process direction that are continuous from edge to edge
of the image, install a new xerographic module, (35 ppm)
PL 9.22 Item 2 , (40-90
ppm) PL 9.20 Item 2 .
– White lines or deletions in the process direction that are continuous from edge to
edge of the image. Check the following:
Contamination of the scorotron. Refer to IQ3 Xerographic RAP