Lexmark C734dn Service Manual page 175

Step Questions / actions
Replace the HVPS. See
4
power supply (HVPS) removal" on
page 4-108.
Did this solve the problem?
Print quality—vertical banding
Replace the developer cartridge.
Print quality—white gapping
Step Questions / actions
1. Open the front cover.
1
2. Remove the toner cartridge base on the
color of the print quality defect.
3. Inspect the cartridge guide for damage or
obstructions. Clear any obstructions.
4. Inspect the cartridge guide wheel if its
dislodged or damaged.
Is the cartridge guide wheel damaged?
1. Reinstall all the toner cartridge.
2
2. Ensure that the photoconductor units are
installed correctly.
3. Reseat the photoconductor.
4. Perform a print test.
Does this fix the problem?
1. Reseat JHVPS1 on the system board.
3
2. Reseat the other end of the cable located
on the HVPS.
3. Check for cuts and damage on the HVPS
cable.
Is the HVPS cable damaged?
1. Check the metal contact on the left of the
4
transfer module for any damage.
2. Check for any contamination, and clear any
contaminants with a piece of cloth.
Are the transfer module contacts damaged?
1. Open the front cover.
5
2. Check the spring contact that is in contact
with the transfer module for any damage or
contamination.
Is the spring contact damaged?
Replace the toner cartridge.
6
Does this fix the problem?
Replace the suspected photoconductor units.
7
Does this fix the problem?
Replace the transfer module.
8
Does this fix the problem?
Problem solved.
"High-voltage
Replace the cartridge guide
wheel. See
guide wheel removal" on
page
Problem resolved.
Replace the HVPS cable.
See
supply (HVPS) cable
removal" on page
Replace the transfer
module. See
module removal" on
page
Replace the cartridge
contact spring. See
"Contact springs kit
removal" on page
Problem resolved.
Problem resolved.
Problem resolved.
Yes
Replace the system board.
See
removal" on page
Yes
Go to step 2.
"Cartridge
4-54.
Go to step 3.
Go to step 4.
"High-voltage power
4-110.
Go to step 5.
"Transfer
4-168.
Go to step 6.
4-70.
Go to step 7.
Go to step 8.
Go to step 9.
Diagnostic information
5026
No
"System board
4-153.
No
2-139
Previous
Next
Go Back