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2-28 Service Manual
4227-X00
Print Wire Drive Failure Service Check
FRU/Symptom Action
1MissingDots
Carrier moves, but
no printing or
printhead sound.
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 Right Bank
Wire 1 CN3-11 & CN3-18 CN3- 9 & CN3- 4
Wire 2 CN4-11 & CN4-20 CN4- 9 & CN4- 2
Wire 3 CN3-13 & CN3-16 CN3- 7 & CN3- 6
Wire 4 CN4-13 & CN4-18 CN4- 7 & CN4- 4
Wire 5 CN4-15 & CN4-16 CN4- 5 & CN4- 6
Wire 6 CN4-17 & CN4-14 CN4- 1 & CN4- 8
Wire 7 CN3-15 & CN3-14 CN3- 3 & CN3- 8
Wire 8 CN4-19 & CN4-12 CN4- 3 & CN4-10
Wire 9 CN3-17 & CN3-12 CN3- 5 & CN3-10
Note: 4227-200 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.
263EHead
Thermal Error
The printer has stopped to protect the
printhead from overheating. Normally this
occurs after several hours of continuous heavy
use in a warm environment, and only then after
going through several stages of thermal
slowdown.
Waitforthemachinetocoolandseeiftheerror
goes away.
If the machine was not being used heavily
before the error occurred, or if the error returns
when the machine is cool, replace the
printhead.