4069-XXX

Main Drive Service Check

Service Tip: Excessive gear or main drive assembly noise is usually caused by a defective motor assembly or engine board.

Service Tip: If there are equally spaced horizontal lines across the page, go to “Print Quality - Evenly spaced horizontal lines or marks” on page 2-96.

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

Action

 

 

 

1

Main Drive Assembly

Remove the controller board and run

 

(Excessive noise or

a Diagnostic Print Test in the

 

vibration)

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.

 

 

 

2

Main Drive Motor Assembly

A service error code 936 - Transport

 

(Excessive noise, gears

Motor may be displayed. Check the

 

ratcheting and so on)

voltage at J12-6 on the engine

 

 

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 engine board. If this does not fix

 

 

the problem, replace the main drive

 

 

motor.

 

 

 

3

Main Drive Motor Cable

Check the continuity of the main

 

 

drive motor cable. If incorrect,

 

 

replace the cable.

 

 

 

2-68Service Manual

Page 96
Image 96
Lexmark 4069-XXX manual Main Drive Service Check