Lexmark 7003-050 X340n, Руководство по обслуживанию

Страница: 41 / 162

2-20
Service Manual
7003-XXX
CCD service check
Cold fuser service check
Make sure the correct voltage lamp is installed. The voltage rating is stamped on one of the lamp contacts.
Cooling fan service check
FRU Action
CCD
Controller card
If you are receiving a 942 error, check the home position sensor for dirt, and
ensure that the sensor is properly connected to the CCD.
Ensure that connectors J1 and J4 are properly connected. Inspect both ribbon
cable connections on CCD for proper connection.
If connector J1 is properly connected, verify the following voltages on the
controller card. Check pin 1 for +5V, pin 5 for +24V, and pin 18 for +24V. Pins 2,
4, 6, 13, 16, and 17 are ground.
If connector J4 is properly connected, verify the following voltages on the
controller card. Check pin 19 for +12V and pin 20 for +5V.
If voltages are present, replace the CCD. If there are voltage irregularities,
replace the controller card.
FRU Action
Fuser AC cables
LVPS/HVPS
Fuser
If the fuser lamp comes on and a fuser failure light error code
displays, be sure the thermistor is contacting the hot roll and the
thermistor cable is firmly seated in connector J15 on the controller
card.
Check for excessive toner buildup on the surface of the thermistor.
Clean as necessary.
With the MFP unplugged, disconnect the thermistor cable from J15
on the controller card.
Measure the resistance of the thermistor. The resistance measures
from approximately 1K ohms immediately after printing or POR to
approximately 240K ohms when thermistor reaches room
temperature. (It may take 30 minutes to cool.)
Replace the fuser assembly as necessary.
FRU Action
Cooling fan Make sure the fan cable plug is properly seated at J19 (controller
card).
Turn the MFP off, and disconnect the cooling fan cable from
connector J19 on the controller card.
Turn the MFP on. Within a few seconds, the controller card assembly
should apply b24 V dc to pin 2. See
“Controller card” on
page 5-4 for more information.
If voltage is present and the fan is not turning, replace the cooling fan.
If the fan still doesn’t function, replace the controller card.
Note: The fan speed is controlled by a module on the controller card.
B8 V and +24 V dc are constantly supplied at pin 2 (J19).
Pin 1 is ground while pin 3 receives feedback from the fan motor.
If voltage is not present, see “Controller card” on page 5-4 for
more information.