Lexmark C760 Service Manual

Diagnostic information2-95
  5060-4xx
956 service error
Service < xxxx> System Board
990 service error
This error indicates which option is causing the error.
5-Bin mailbox
Step Action and questions Yes No
1 Remove all option boards from the system board. Turn 
on the printer.
Does the error continue? Replace the 
system board. 
See 
“System 
board” on 
page 4-72 .  Go to step 2
2Replace each option board one at a time, making sure 
the boards are properly seated. Turn the printer off and 
then on...

2-96Service Manual
5060-4
xx   
500-sheet drawer option
For 990 Service Error - Tray x,  x=Tray 2, 3, 4 or 5, this is the tray that has a problem or needs service.
Note:   Verify the autoconnect housing is correctly snapped into the printer and all options, and is plugged into 
the system board correctly.
Output expander
Step Action and questions Yes No
1 Make sure the autocompensator cable is correctly 
installed at the tray system board.
Is the cable correctly installed? Go to step 2 Install the cable...

Diagnostic information2-97
  5060-4xx
Finisher
4Output expander control board check - Disconnect the 
motor cable J4 and check the voltages at J4 on the 
board. 
Warning : Be careful not to short to adjacent pins on 
the connector.
The voltages measure approximately:
J4-1 (Motor Idle) +24 V dc
J4-2 (Motor Idle) +24 V dc
J4-3 (Motor Idle) +5 V dc
J4-4 (Motor Idle) +5 V dc
Are the voltages correct? Replace the 
output expander 
control board
Replace the 
mechanical 
linkage/DC motor 
assembly
Step Actions...

2-98Service Manual
5060-4
xx   
5-bin mailbox option service check
Note:  Before proceeding with this service check make sure the option(s) are installed correctly before 
attempting to service the unit. Make sure the machine is configured correctly. The majority of the mechanical 
components can be observed during operation by removing the left and right side covers.
Step Symptoms Yes No 1 Problems with excessive static electricity buildup. Go to  “Problems 
with excessive 
static electricity...

Diagnostic information2-99
  5060-4xx
The printer does not recognize one or more output options as installed.
Note:  If more than a single output option is installed, check each one to see if the printer recognizes any single 
option as being installed. If the printer recognizes any of the output options then the base printer autoconnect 
system is operating correctly and the problem is in the unrecognized option. Continue with this service check or 
go to service check of the failing output option....

2-100Service Manual
5060-4
xx   
Ready bin x full message - may be able to clear message and will feed paper into bin 
selected.
Note:   This sensor is normally in a open position with the flag out of the sensor slot.
Bin x full - no message that bin  x is full message
Step Action and questions Yes No
1 Bin x sensor (bin  x=Sensor 1 through 5) - Make sure 
the sensor is seated correctly in the side of tray  x.
Is the sensor seated correctly? Go to step 2 Install the sensor 
correctly
2Bin x sensor cable...

Diagnostic information2-101
  5060-4xx
Ready - bin  x full displays and paper feeds into bin  x
Paper does not feed into the bin selected. 271 Paper Jam - check bin  1 message
Step Action and questions Yes No 1 Bin x sensor flag - Make sure the bin  x sensor flag is 
not in the up position and is operating correctly.
Is the sensor flag operating correctly? Replace the bin 
x 
sensor. If this 
does not fix the 
problem replace 
the control board. Repair or replace 
as necessary
Step Action and questions...

2-102Service Manual
5060-4
xx   
500-sheet drawer option service check
If the paper does not feed from the 500-sheet option, see “Autocompensator service check” on page 2-107.
Whenever the 500-Sheet Tray is removed, use care as the autocompensator may be in its down position which 
could result in damage to the autocompensator assembly.
The tray empty sensor, paper low sensor, and pass thru sensor for any installed tray x ( x=2 through 4) can be 
checked using the  “Sensor Test” on page 3-25 .
The base...

Diagnostic information2-103
  5060-4xx
Tr a y  x autocompensator fails to retract, stays in down position.
The printer detects paper low in tray  x when adequate paper is installed in the tray.
Step Action and questions Yes No
1 Use care when removing a tray assembly when the 
autocompensator is in its down position. Remove the 
tray and manually reset the autocompensator to its 
uppermost position by actuating the pick arm lift 
bellcrank.
Does the autocompensator assembly stay in the up 
position? Go...

2-104Service Manual
5060-4
xx   
The printer detects paper out in tray x when adequate paper is installed in the tray.
Tr a y   x does not detect size media installed
Step Action and questions Yes No
1 Run Tray  x Sensor Test from the Diagnostics Menu.
Does the test pass for Sensor L1? Go to step 5 Go to step 2
2Check the cable connection for the paper level sensing 
assembly to tray 
x system board.
Is the cable correctly installed? Go to step 3 Install the cable 
correctly
3Check the paper level...