Xerox WorkCentre 5790 Series Service Manual page 722

A
Remove the xerographic module. Remove the developer module
from the developer roll by rotating the drive gear. Re-install the developer and xerographic
modules. Enter dC330, code 04-010 main motor MOT04-010. Run MOT04-010 for approxi-
mately 5 seconds. Remove the xerographic module and inspect the developer roll. The devel-
oper roll has developer on its surface.
Y N
Check the drives to the developer, GP
paddle, PL 9.20 Item 14. If necessary, install a new developer module, (35-55 ppm)
9.17 Item 2 or (65-90 ppm) PL 9.15 Item
If applicable, save the customer auditron, using the PWS Auditron Save and Restore tool.
Perform dC132, All Copier NVM initialisation. This sets the machine NVM to default. Make one
DADH and one platen copy of test pattern 82E2010/82E2020. Then run one each of Internal
Test Patterns 11, and 15, dC606. Compare these copies and prints to
Figure 5. The copies fail to meet the specification.
Y N
The copies are good. Perform Final Actions
Check dC131 NVM location 09-069. If the value is between 805 and 1200, do not perform the
following action, but continue with this procedure. If the value is not between 805 and 1200,
perform the following action:
• Change the value to 1000. Save the new NVM value and exit diagnostics using the call
closeout and the machine reboot option. Run 200 copies of internal test print 12 to stabi-
lise the machine. Copy and evaluate test pattern 82E2010/82E2020 and print and evalu-
ate internal test patterns 11 and 15. Refer to
and prints now meet the specification, perform
fail to meet the specification, continue with this procedure.
Produce a solid black print. Refer to the Solid Black Print
Use the density reference chart 82P520 or 82E8230. Compare the solid black area of the print,
with the 1.3 -1.5 reference patches of the chart,
should be darker than the 1.4 reference, but lighter than the 1.5 reference. If using 82E8230,
the solid black print should be as dark or darker than the 1.3, but lighter than the 1.5. The
solid black is good and not grey or mottled.
Y N
Check that the toner dispenser is working. Open the bypass tray and remove the upper
left hand cover, PL 8.10 Item 3. Refer to
red wire on pin 8 of PJ93 while printing 20 copies of test pattern 82E2010/82E2020. This
is the output of the toner concentration sensor. The voltage should be between +1.5V and
+2.8V. The voltage is correct.
Y N
If the voltage is consistently above +2.8V, the toner dispenser is not operating cor-
rectly. Install a new toner dispenser module, (35-55 ppm)
ppm) PL 9.15 Item 1.
If the voltage is below +1.5V, install a new developer module, (35-55 ppm)
Item 2 or (65-90 ppm) PL 9.15 Item
Enter diagnostics dC131, location 09-069. Increase the value by 200, or to the maximum
value of 1200 if an increase of 200 is not available.
Save the new NVM value and exit diagnostics using the call closeout and the machine
reboot option.
B
Image Quality
IQ11
REP 9.2. Clear the developer
7. If no problem is found, install a new developer
2.
Figure 1, Figure 4
within this procedure.
Figure 1, Figure 4 and Figure 5. If the copies
Final Actions. If the copies and prints still
Routine. Evaluate the print as follows:
Figure 3. If using 82P520, the solid black print
Wiring Diagram 10. Monitor the voltage on the
PL 9.17 Item 1 or (65-90
2.
B
Run 200 copies of internal test pattern 12, then produce a solid black print using the
Black Print Routine. Check the solid black area of the print using the density reference
chart, Figure 3, as checked previously. The print is solid black and meets the specifi-
cation.
Y N
Install a new developer module, (35-55 ppm)
Item 2.
PL
The solid black reproduction is good.
Perform the ROS Check, then return and continue with this procedure.
Produce one DADH and one platen copy of 82E2020/2010. Evaluate the copies as shown in
Figure 1. The copies fail to meet the specification.
and Y N
The copies are good. Perform
Enter diagnostics dC131, refer to
machine speed.
Perform the Image Quality Adjustment Routine,
Perform Final Actions.
Solid Black Print Routine
Unscrew the head of an AA Mini-Mag Lite, tool number 600T01824. Ensure fresh batteries are
installed. With the light lit, place the Mini-Mag Lite in the slot on the top side of the xerographics
module, with the back of the Mini-Mag Lite to the rear of the module,
Remove the Mini-Mag Lite to prevent light shock on the drum.
On the copy, the area of the drum that was blocked by the Mini-Mag Lite should be white. The
area of the drum illuminated by the Mini-Mag Lite should be solid black.
ROS Check
Print one internal test print 15, dC606. Evaluate the print, refer to
Do not set the laser tight levels outside the minimum or maximum values
1. The two darkest bands, 7 and 8, should be solid black and almost or completely indistin-
guishable from each other. If bands 7 and 8 are not solid black, refer to
diagnostics dC131, location 06-001. Raise or lower the value by 250. Raising the value
darkens the print density and merges the darker bands. Lowering the value lightens the
print density and separates the darker bands. If this part of the specification cannot be
met, clean the ROS, ADJ
2. Bands 1 to 6 inclusive should all be distinct from each other.
3. Band 1 may be white or light grey. If any of these bands merge, the single board controller
PL 9.17
PWB is defective. Install a new single board controller PWB,
Table 3 Laser light level NVM location 06-001 values
Speed
35 ppm
45/55 ppm
65/75/90 ppm
May 2013
3-26
PL 9.17 Item 2 or (65-90 ppm)
Final Actions.
Table 2 and enter the appropriate NVM values dependant on
ADJ 9.2.
Figure
Figure
CAUTION
6.2. If necessary, install a new ROS, PL 6.10 Item
PL 3.24 Item
Min/Max Values Default Value
3000/4471 3471
1500/3050 2250
1500/3200 2400
Xerox® WorkCentre® 5790 Family
Solid
PL 9.15
2. Run one copy.
4:
Table 3. Enter
4.
3.