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52 Maintenance
Croma24 Service Manual
Replace Carrier Bushings
The carrier bushings are rated for approximately 1500 hours of
operational usage. Given an average of about 3 hours a day of
printing for 104 weeks, results in 1560 hours. Therefore, it is safe to
approximate 1500 hours into 2 years of continuous service.
If not replaced, the wear on the bushings can result in erratic carrier
motion and/or carrier axis failures. It can even cause cartridge
headheight to become uneven.
To replace the carrier bushings, follow the Replacing the Carrier
Bushing procedures in Chapter 5.
Servo Motor Winding Resistance Check
Figure 3-7. Servo Motor.
1. Disconnect the servo motor connection from the MPCB.
2. Using a standard ohmmeter or multimeter, connect the
meter leads to the two wires going to the motor.
3. While manually rotating the servo motor, monitor the
readings on the meter. The acceptable range is 10-20 ohms.
Typically, the reading is 12-16 ohms.
5. If the measurement is found to be unsatisfactory, replace the
servo motor.