Xerox WorkCentre 5790 Series Service Manual page 707

– If both the print and the copy are completely black, go to the
Under Control RAP.
– If only the print is good, but the copy is black, go to the
716, 718 Failure To Calibrate Entry RAP and perform the Exposure Lamp Check.
– For other black images, go to the
• 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
If the copy has a dark band go to the
If the blank images are additional output. Go to the
– Check the developer drives:
1. Remove the xerographic module, (35 ppm)
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)
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,
– If 09-060 faults are in the fault history log, go to the
• 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)
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)
9.20 Item 2.
Xerox® WorkCentre® 5790 Family
06-350 ROS Laser Not
14-703 to 14-706, 712, 714,
IQ3 Xerographic RAP.
IQ3 Xerographic RAP.
06-340 ROS Laser Failure RAP.
OF8 Multifeed RAP
PL 9.22 Item 2 or (40-90 ppm)
PL 9.22 Item 2 or (40-90 ppm)
GP 7.
09-060 HVPS Faults RAP.
PL 9.22 Item 8 or (40-90 ppm)
PL 9.22 Item 2 or (40-90 ppm)
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,
(35 to 55 ppm) PL 10.10 Item 1
d. If the problem continues, perform the
installing a new IOT PWB,
e. If the problem continues, Install a new fuser connector assembly,
9 (65 to 90 ppm)
f. If the problem continues, Install a new LVPS and base module
• Dark prints. Go to the IQ3
• Deletions. Check the following:
PL
– If the deletions are on the duplex side of a print or copy, go the
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
– If the deletions are small spots, this can be caused by beads on the image. Refer to
PL
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
PL
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
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
Quality Adjustment Routine as an initial action. If
ADJ 9.5 Optimize Dark and Light Grey Image.
• Light images. Go to the IQ11
• 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)
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:
PL
Contamination of the scorotron. Refer to
May 2013
3-11
(65 to 90 ppm).
OF7 IOT PWB Diagnostics rap, before
PL 1.10 Item 2.
PL 4.15 Item 9 (35 to 55 ppm).
Xerographic RAP.
IQ13 Cockle Deletion RAP.
dC131
ADJ 9.2 fails to solve the problem, go to
Light Copies RAP.
PL 9.22 Item
IQ3 Xerographic RAP
PL 10.8 Item 1
PL 4.10 Item
PL 1.10 Item 3.
IQ5 Print Damage
IQ3
NVM Read / Write
ADJ 9.2 Image
2, (40-90
Image Quality
IQ2