Lexmark T620 Service Manual - Page 132

4069-5XX/7XX 990 Service Error displays FRU 1 Mechanical Linkage DC Motor Assembly 2 Control Board Action Check the DC motor cable connector to be sure it is correctly installed at J2 on the control board. If correct, disconnect J2 from the control board and check the resistance of the motor on the cable connector. J2-1 to J2-2 measures between 115 and 135 ohms. Also check J2-1 and J2-4 to the motor case for shorts. If either the resistance is incorrect or a short if found, replace the mechanical linkage/ DC motor assembly. Note: If the DC motor is shorted, it may also be necessary to replace the control board. Disconnect the motor cable J2 from the control board and check the voltages at J2 on the board. Note: Use caution not to short adjacent pins on the connector as damage to the board could result. J2-1 (motor idle) +24 V dc J2-2 (motor Idle) +24 V dc J2-5 (motor idle) +5 V dc J2-6 (motor idle) +5 V dc If any of the voltages are incorrect, replace the control board. If correct, replace the mechanical linkage/ DC motor assembly. 2-104 Service Manual