Lexmark 4227-100, Руководство по обслуживанию

Страница: 46 / 134

2-26
4227-100
Power Failure Service Check
Refer to the “Voltage, Ground, and Continuity Readings” on page
1-2 , for additional information.
FRU Action
1 Operator Panel If the operator panel or cable is damaged or
disconnected, the machine is completely
inoperable, except for the power supply fan
noise.
If the power LED is not on steady, check the
cable continuity and replace the cable or the
operator panel.
2 Power Supply
Power Supply
Fuse If the printer is completely inoperable,
disconnect the power cables from the main
logic board (CN11) and the sub logic board
(CN1).
Turn the power on and measure
+5 ±
0.
5 V dc at the sub logic board cable CN1-
5 and +40 ± 4 V dc at CN1-1 and CN1-2. If
there is no voltage, check the internal fuse
before replacing the power supply.
A 634 Power Failure indicates that the +5 V dc
is OK but the +40 V dc is not. Power the printer
off, wait 10 seconds, and power back on. If the
634 reappears either the power supply has
failed or there is a short in a motor that uses
+40 V dc.
3 Ribbon Motor
Paper Feed Motor
Carrier Motor
Sub Logic Board Disconnect the carrier motor (CN9 and CN15),
the paper feed motor (CN-10), and the ribbon
motor (CN-19) 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.