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IQ6 Narrow Bands RAP
Use this RAP to determine the cause of narrow bands.
Ensure
IQ1
Image Quality Entry RAP is performed before starting this RAP.
Procedure
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.
Check the pitch of the bands. The bands have a regular pitch.
Y
N
Bands that are irregular are caused by worn gears in the following areas. Examine the
gears, the shafts and the bearings,
•
Registration transport gears;
PL 8.15 Item
•
Registration transport drive pulley, (35-55 ppm)
4.12 Item
15.
•
Main drive belts; (35-55 ppm)
4.12 Item
18.
•
Developer drive gear, (35-55 ppm)
•
Fuser drive gear, (35-55 ppm)
•
Developer assembly, (35-55 ppm)
•
Short paper path (W/O
TAG
114) gears,
•
Install new components as necessary.
The ROS makes the narrow bands that are only visible on half tones prints.
•
Machine speed of 35-55 ppm, the pitch is 9.8 bands to 1cm (25 bands to 1 inch).
•
Machine speed of 65-90 ppm, the pitch is 10 bands to 1 cm (25 bands to 1 inch).
To resolve banding caused by motion wobble of the ROS, install a new ROS,
Xerox® WorkCentre® 5790 Family
WARNING
GP
7.
17,
PL 8.15 Item 18
and
PL 8.15 Item
PL 4.17 Item 14
or (65-90 ppm)
PL 4.17 Item 9
or (65-90 ppm)
PL 4.12 Item 9
PL 4.17 Item 15
or (65-90 ppm)
PL 4.12 Item
PL 4.17 Item 10
or (65-90 ppm)
PL 4.12 Item
PL 9.17
or (65-90 ppm)
PL
9.15.
PL 10.25 Item 3
and
PL 10.25 Item
PL 6.10 Item
IQ7 DADH, Document Glass and Scanner RAP
Use this RAP to identify failures caused by the DADH, document glass and the scanner.
Ensure
IQ1
Image Quality Entry RAP is performed before starting this RAP.
Procedure
Ensure that the electricity to the machine is switched off while performing tasks that do
not need electricity. Refer to
death or injury. Moving parts can cause injury.
Perform the following:
•
DADH Checkout
•
Document Glass Checkout
•
Scanner Checkout (W/O TAG 150)
19.
•
Scanner Checkout (W/TAG 150)
PL
DADH Checkout
Perform the following:
and
PL
•
Clean the underside of the DADH area around the CVT roll,
17.
•
Clean the top surface of the CVT glass and the document glass. Refer to
Cleaning Procedure (W/O
10.
150).
•
If the documents are skewed. Check that the document input guides are correctly
5.
adjusted.
•
Check that the DADH is seated correctly, perform the
•
Make copies from the DADH and the document glass. If the copies from the DADH are
lighter or darker than those from the document glass, perform the following:
–
Go to
dC131
NVM Read / Write location 15-007 CVT scanning image gain. The
default value is 3. If the value is increased copies made from the DADH will be
4.
darker. If the value is decreased, copies made from the DADH will be lighter.
•
Make copies from the DADH. If the copies have a background problem, perform the fol-
lowing:
–
Check the DADH height, Refer to
–
Check the registration. Refer to
–
Copying thick documents can leave the DADH raised above the document glass.
Raise and lower the DADH five times. If the DADH is still raised, install new counter-
balance,
PL 5.10 Item 2
•
Make copies from the DADH. If the copies are stretched or smudged, perform the follow-
ing:
–
Lower the height of the DADH by half a turn of the setting screws, refer to
DADH Height Adjustment. Make copies from the DADH after each adjustment. If the
fault persists, re-adjust the height of the DADH as necessary.
–
If the fault persists after the height of the DADH has been adjusted, install a new
DADH baffle assembly,
default setting, refer to
May 2013
3-19
WARNING
GP
14. Disconnect the power cord. Electricity can cause
PL
5.25.
TAG
150) or
ADJ 14.2
Optics Cleaning Procedure
ADJ 5.2
DADH Height Adjustment.
ADJ 5.2
DADH Height Adjustment.
dC604
Registration Setup.
and
PL 5.10 Item
4.
PL 5.30 Item
5. Re-adjust the height of the DADH to the
ADJ 5.2
DADH Height Adjustment.
ADJ 14.1
Optics
(W/TAG
ADJ 5.2
Image Quality
IQ6, IQ7
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