Lexmark 4227 - Forms Printer B/W Dot-matrix Service Manual page 50

4227-300
FRU
3 Ribbon Motor
Paper Feed Motor
Carrier Motor
Sub Logic Board
4227-300 Carrier
Motor Cooling
Fan
4 Printhead Cables
Printhead
5 Main Logic Board
2-26
Service Manual
Action
Disconnect the carrier motor (CN9 and CN15),
the paper feed motor (CN10), the ribbon motor
(CN19) and the (4227-300) carrier motor
cooling fan (CN17) from the main logic board,
and disconnect the power connector CN-1
from the sub logic board. Turn the power on
again. If there is still a power problem, replace
the main logic board.
If the machine posts a different error, one of
these items is shorted and is holding down the
+40 V dc line. Reconnect them one at a time,
turning the printer on in between each
connection.
Replace the item that causes the power failure.
Disconnect the printhead cables from the sub
logic board and turn the printer on. If the power
LED lights correctly only with the printhead
cables disconnected from the sub logic board,
there is a short in the printhead or printhead
cables.
If all the above items have been examined and
there is still a power problem, replace the main
logic board. (Retain the old board for
reinstallation if the problem is not fixed.)
"Bidirectional print adjustment"
Perform the
on page 4-3
and check the
platen gap adjustment" on page 4-2
"Printhead-to-
.