Lexmark C760 Service Manual

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HCIT
Use the  “HCIT standalone test mode” on page 3-36  inside the HCIT to help isolate paper jams. Run the 
Standalone Feeding Operation Test to observe paper feeding from the tray and through the feed assembly. Use 
the  “HCIT system board LED error code table” on page 2-121  to further isolate paper jam or sensor 
problems.
Before proceeding with this service check, make sure the HCIT is installed correctly.
9Check the autocompensator cable for correct...

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7Check the pick motor cable to HCIT system board 
cable connected to CN4 for correct installation.
Is the cable connected correctly?Replace the 
following FRUs in 
the order shown:
1. HCIT system  board
2. Feed unit  assembly Install the cable 
correctly
8Use the 
“HCIT system board LED error code table” 
on page 2-121 .
Does the LED flash 7 times? Go to step 9 Go to step 11
9Make sure the registration home sensor cable is 
installed correctly to the sensor and to CN6 on...

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Envelope feeder
Before proceeding with this service check, make sure the envelope option is installed correctly.
Step Action and questions Yes No 1 Make sure the envelopes installed in the tray meet 
specifications.
Some guidelines that can be used in selection of 
envelopes that will minimize the jam rate are:
 Flat envelopes that are not warped or twisted.
 Flexible envelopes that can conform to the paper  path.
 Smooth surface on the envelopes. Rough or ridged...

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250 Paper Jam
Unable to clear the message—Multipurpose feeder loaded
Note:  A 250 Paper Jam displays when using a multipurpose feeder. 
Step Action and questions Yes No 1 Make sure the media in the MPF meets specifications.
Does media meet specifications? Go to step 2 Inform user that 
the media in the 
MPF does not 
meet 
specifications.
2Does the media feed correctly from tray 1? Go to step 3 Go to “Tray 1 
service check” 
on page 2-142 .
3Is the Paper Type setting...

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Displayed with no media in MPF
A 250 Paper Jam indicates that the MPF tried to feed a sheet of media from the MPF tray. A 250 Paper Jam may 
occur when there is no paper in the MPF, MPF is selected as the paper source, or the MPF sensor is 
malfunctioning. If media is in the MPF it may feed normally with no 250 Paper Jam even though the sensor is 
malfunctioning.
Step Action and questions Yes No 1 Enter the Diagnostics Menu. Select  INPUT TRAY 
TESTS , Sensor Test ,...

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271 Paper Jam - check bin 1
Output bin
POST complete, first sheet of paper feeds into output bin x.
Note:   Before proceeding with this service check run the Output Bin  x Sensor Test and check for the failing 
sensor.
Sensor Tests:
XNF Near Full (Upper par t of sensor assembly)
F Full (Lower part of sensor assembly)
P Pass Thru Sensor
Step Actions and questions Yes No
1 DC motor cable connection - Make sure the DC motor 
connector is correctly installed at J4 on the...

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272 Paper Jam - check bin x
5-bin mailbox
5-bin mailbox
POST incomplete
Step Action and questions Yes No
1 Bottom pass thru sensor flag - Make sure the flag is 
operating correctly and is not binding, broken, and 
there is no interference from the sensor cable.
Is there any problem found with the sensor flag? Fix or replace the 
flag
Go to step 2
2Bottom pass thru sensor - Make sure the sensor is 
correctly connected to J5 on the control board.
Is the sensor...

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280 Paper Jam
Use the table below to determine where to check for jams in the printer and to diagnose a 280 Paper Jam. Check 
the area indicated to find the jam and the problem. If this does not fix the problem, contact the next level ow 
support.
DB1 Explanation
01 Paper detected at inverter timing sensor too long. Paper jam in inverter, sensor failure.
02 Paper detected at inverter jam sensor too long. Paper jam in inverter, sensor failure.
03 Paper detected at drop...

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900 RIP Software Error
The 900 error may indicate a communication problem (bad cable, network connection, and so on), software 
issue, or a hardware problem with the controller board/INA. The communication and software aspects should be 
checked first. Determine if the problem is constant or intermittent.
Constant 900 errors
1C Paper detected at punch timing sensor too long. Dirty or failed punch timing sensor.
1E Paper not detected at punch timing sensor within...

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Intermittent 900 Service RIP Error codes
It is important to determine under what circumstances the error occurs. Capturing the following information aids 
in categorizing the nature of the intermittent error.
1.Crash codes - With the 900 Service RIP Error displayed, press Select and Return  together. Record the 
complete secondary codes by scrolling with  Menu. The code may be a very long string of characters and 
numbers, but it is needed to analyze the problem.
2.Print...