Lexmark C760 Service Manual

Diagnostic information2-85
  5060-4xx
925 error code
Fuser fan (main fan)
926 error code
VTB Fan service check
Step Actions and questions Yes No
1 Turn the power off and manually spin the fan and check 
that it rotates freely.
Does the fan rotate freely? Go to step 2 Replace the 
“Fuser fan” on 
page 4-38
2Check the fuser fan cable connection to the system 
board, J31 for correct installation.
Is the cable installed correctly? Go to step 3 Install the cable 
correctly
3Disconnect the fuser fan from J31...

2-86Service Manual
5060-4
xx   
927 error code
RIP Fan service check
930 error code
LV P S
This problem with the fuser circuits is usually the zero crossover signal from the LVPS not working correctly.Step Actions and questions Yes No
1 Turn the power off and manually spin the fan and check 
that it rotates freely.
Does the fan rotate freely? Go to step 2 Replace the 
“RIP 
fan” on 
page 4-69
2Check the RIP fan cable connection to the system 
board, J3 for correct installation.
Is the cable installed...

Diagnostic information2-87
  5060-4xx
940 error code
Cyan toner metering cycle (TMC)
The TMC is where the code and electronics in the printer sense an addition of toner in the cartridge developing 
area. If the printer is expecting a toner addition cycle but one is not detected, a 94x TMC Error is displayed.
Replacement of the cartridge may fix the problem temporarily if the problem is with the printer. Only replace the 
cartridge if there are no problems with the printer or if the cartridge is known to...

2-88Service Manual
5060-4
xx   
3Go to “BASE SENSOR TEST” on page 3-30  and 
check the cyan TMC sensor. When you press the TMC 
pin in the cyan cartridge contact assembly make sure it 
actuates the TMC switch on the developer HVPS. 
When the TMC pin is pressed in you hear a  click when 
the switch actuates. Check for mechanical interference 
between the contact block and the developer HVPS.
Note:  You may need to turn the printer off to hear the 
click .
Does the cyan TMC switch on the developer HVPS...

Diagnostic information2-89
  5060-4xx
941 error code
Magenta toner metering cycle (TMC)
The TMC is where the code and electronics in the printer sense an addition of toner in the cartridge developing 
area. If the printer is expecting a toner addition cycle but one is not detected, a 94x TMC Error is displayed.
Replacement of the cartridge may fix the problem temporarily if the problem is with the printer. Only replace the 
cartridge if there are no problems with the printer or if the cartridge is known...

2-90Service Manual
5060-4
xx   
3Go to “BASE SENSOR TEST” on page 3-30  and 
check the magenta TMC sensor. When you press the 
TMC pin in the magenta cartridge contact assembly 
make sure it actuates the TMC switch on the developer 
HVPS. When the TMC pin is pressed in you hear a 
click  when the switch actuates. Check for mechanical 
interference between the contact block and the 
developer HVPS.
Note:  You may need to turn the printer off to hear the 
click .
Does the magenta TMC switch on the...

Diagnostic information2-91
  5060-4xx
942 error code 
Yellow toner metering cycle (TMC)
The TMC is where the code and electronics in the printer sense an addition of toner in the cartridge developing 
area. If the printer is expecting a toner addition cycle but one is not detected, a 94x TMC Error is displayed.
Replacement of the cartridge may fix the problem temporarily if the problem is with the printer. Only replace the 
cartridge if there are no problems with the printer or if the cartridge is known...

2-92Service Manual
5060-4
xx   
3Go to “BASE SENSOR TEST” on page 3-30  and 
check the yellow TMC sensor. When you press the 
TMC pin in the yellow cartridge contact assembly make 
sure it actuates the TMC switch on the developer 
HVPS. When the TMC pin is pressed in you hear a 
click  when the switch actuates. Check for mechanical 
interference between the contact block and the 
developer HVPS.
Note:  You may need to turn the printer off to hear the 
click.
Does the yellow TMC switch on the developer...

Diagnostic information2-93
  5060-4xx
943 error code 
Black toner metering cycle (TMC)
Toner metering cycle (TMC) is where the code and electronics in the printer sense an addition of toner in the 
cartridge developing area. If the printer is expecting a toner addition cycle but one is not detected, a 94x TMC 
Error is displayed.
Replacement of the cartridge may fix the problem temporarily if the problem is with the printer. Only replace the 
cartridge if there are no problems with the printer or if the...

2-94Service Manual
5060-4
xx   
3Go to “BASE SENSOR TEST” on page 3-30  and 
check the black TMC sensor. When you press the TMC 
pin in the black cartridge contact assembly make sure 
it actuates the TMC switch on the developer HVPS. 
When the TMC pin is pressed in you hear a  click when 
the switch actuates. Check for mechanical interference 
between the contact block and the developer HVPS.
Note:  You may need to turn the printer off to hear the 
click .
Does the black TMC switch on the developer HVPS...