Main Drive Service Check - Lexmark T620 Service Manual

4069-5XX/7XX

Main Drive Service Check

Service Tip: Excessive gear or main drive assembly noise is usually
caused by a defective motor assembly or
Service Tip: If there are equally spaced horizontal lines across the
page, go to "Print Quality - Evenly spaced horizontal lines or
marks." on page
WARNING: Whenever the gearbox assembly is removed from the
machine it must be handled very carefully. Do not allow any of the
gears to come in contact with any metal or other hard surface to
avoid gear damage. It is also very important not to let any dirt, paper,
staples or other material come intact with the grease in the gearbox
assembly.
FRU
1 Main Drive Assembly
(Excessive noise or
vibration)
2 Main Drive Motor Assembly
(Excessive noise, gears
ratcheting and so on)
3 Main Drive Motor Cable
2-113.
Action
Remove the system board and run a
Diagnostic Print Test in the
continuous mode. Check the main
drive assembly for any excessive
noise or vibration. Determine if the
noise is in the main drive, toner
cartridge, fuser or main drive
gearbox. Look for any loose or worn
parts in the developer drive
assembly, main drive gearbox or
fuser. Repair as necessary.
A service error code 936 - Transport
Motor may be displayed. Check the
voltage at J27-6 on the system
board. It measures approximately
+5 V dc when the motor is not
running and goes to 0 V dc when the
motor is running. If incorrect, replace
the system board. If this does not fix
the problem, replace the main drive
motor.
Check the continuity of the main
drive motor cable. If incorrect,
replace the cable.
board.
system
Diagnostic Information
2-85