Print Wire Drive Failure Service Check - Lexmark 4227 - Forms Printer B/W Dot-matrix Service Manual

4227-300

Print wire drive failure service check

FRU/Symptom
1 Missing Dots
Carrier moves,
but there is no
printing or
printhead sound.
2-28
Service Manual
Action
Perform the Print Test to determine which
wires are not printing. Disconnect the printhead
cables from the sub logic board and check the
resistance for the affected wires. The
resistance for each wire should be around
8.5 ohms.
Left Bank
Wire 1 CN3-11 & CN3-18
Wire 2 CN4-11 & CN4-20
Wire 3 CN3-13 & CN3-16
Wire 4 CN4-13 & CN4-18
Wire 5 CN4-15 & CN4-16
Wire 6 CN4-17 & CN4-14
Wire 7 CN3-15 & CN3-14
Wire 8 CN4-19 & CN4-12
Wire 9 CN3-17 & CN3-12
Note: 4227-300 connectors will be
CN1 and CN2.
If the resistance for the affected wires is
incorrect, disconnect the printhead cables from
the printhead and measure the resistance of
the printhead for the same wires. The
resistance should be around 7.9 ohms.
• If the resistance is correct, replace the
printhead cables.
• If the resistance is incorrect, replace the
printhead.
Right Bank
CN3- 9 & CN3- 4
CN4- 9 & CN4- 2
CN3- 7 & CN3- 6
CN4- 7 & CN4- 4
CN4- 5 & CN4- 6
CCN4- 1 & CN4-8
CN3- 3 & CN3- 8
CN4- 3 & CN4-10
CN3- 5 & CN3-10