Lexmark 4076 Execjet II Service Manual - Page 32

Print Quality Service Check

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4076-0XX Print Quality Service Check FRU OR PROCEDURE ACTION 1 Print Cartridge Be sure the machine has a known good print cartridge. 2 Print Head Carrier Assembly Reseat the print head cable in the system board and check the following parts for wear or damage: 3 Purge Test Print Cartridge Latch Latch Spring Carrier Perform the "Purge Test" on page 25. Look for a break in the diagonal line at the bottom of the test pattern. A broken line indicates one or more print nozzles are not working. Run the test again to verify the failure If there are even breaks in the diagonal line similar to the pattern shown below, replace the system board. If there is a single break or random breaks in the diagonal line check the following: • Print head cable - check the goldplated contacts on the end of the cable that connects to the carrier for dirt and wear. Use only a clean dry cloth to clean the contacts. Also check the cable for damage. You may need to remove the cable from the carrier to inspect it. • Rubber Backer - a worn rubber backer will result in poor contact between the print head cable and the print cartridge. Check the rubber backer for wear 20

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4076-0XX
20
Print Quality Service Check
FRU OR PROCEDURE
ACTION
1
Print Cartridge
Be sure the machine has a known
good print cartridge.
2
Print Head Carrier Assembly
Reseat the print head cable in the
system board and check the following
parts for wear or damage:
Print Cartridge Latch
Latch Spring
Carrier
3
Purge Test
Perform the
“Purge Test” on page 25
.
Look for a break in the diagonal line
at the bottom of the test pattern. A
broken line indicates one or more
print nozzles are not working. Run the
test again to verify the failure If there
are even breaks in the diagonal line
similar to the pattern shown below,
replace the system board.
If there is a single break or random
breaks in the diagonal line check the
following:
• Print head cable - check the gold-
plated contacts on the end of the
cable that connects to the carrier for
dirt and wear. Use only a clean dry
cloth to clean the contacts. Also
check the cable for damage. You
may need to remove the cable from
the carrier to inspect it.
• Rubber Backer - a worn rubber
backer will result in poor contact
between the
print head cable and
the print cartridge. Check the rub-
ber backer for wear