Lexmark C734dn Service Manual

Diagnostic information 2-139
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Print quality—vertical banding
Replace the developer cartridge.
Print quality—white gapping
4
Replace the HVPS. See “High-voltage
power supply (HVPS) removal” on
page 4-108.
Did this solve the problem?
Problem solved. Replace the system board.
See “System board
removal” on page 4-153.
Step Questions / actions Yes No
1 1. Open the front cover.
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?
Replace the cartridge guide
wheel. See “Cartridge
guide wheel removal” on
page 4-54.
Go to step 2.
2
1. Reinstall all the toner cartridge.
2. Ensure that the photoconductor units are
installed correctly.
3. Reseat the photoconductor.
4. Perform a print test.
Does this fix the problem?
Problem resolved. Go to step 3.
3
1. Reseat JHVPS1 on the system board.
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?
Replace the HVPS cable.
See “High-voltage power
supply (HVPS) cable
removal” on page 4-110.
Go to step 4.
4
1. Check the metal contact on the left of the
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?
Replace the transfer
module. See “Transfer
module removal” on
page 4-168.
Go to step 5.
5
1. Open the front cover.
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 cartridge
contact spring. See
“Contact springs kit
removal” on page 4-70.
Go to step 6.
6
Replace the toner cartridge.
Does this fix the problem?
Problem resolved. Go to step 7.
7
Replace the suspected photoconductor units.
Does this fix the problem?
Problem resolved. Go to step 8.
8
Replace the transfer module.
Does this fix the problem?
Problem resolved. Go to step 9.
Step Questions / actions Yes No

Lexmark C734dn Specifications

General

Brand	Lexmark
Model	C734dn
Category	Printer
Language	English