Lexmark T620 Service Manual - Page 123

4069-5XX/7XX 990 Service - BIN X FRU 1 D.C. Motor Mechanical Linkage Assembly 2 Output Expander Control Board Action Check the DC motor cable connector to be sure it is correctly installed at J4 on the output expander option board. If correct, disconnect J4 from the option board and check the resistance of the motor on the cable connector: J4-1 to J4-2: measures between 115 and 135 ohms. Also check J41 and J4-2 to the motor case for shorts. If either the resistance is incorrect or a short is found, replace the motor/mechanical linkage assembly. Note: If the DC motor is shorted, it may also be necessary to replace the control board. Disconnect the motor cable J4 and check the voltages at J4 on the board. Note: Use caution not to short to adjacent pins on the connector. J4-1 (Motor Idle) +24 V dc J4-2 (Motor Idle) +24 V dc J4-5 (Motor Idle) +5 V dc J4-6 (Motor Idle) +5 V dc If any of the voltages are incorrect, replace the control board. If the voltages are correct, replace the DC motor/mechanical linkage assembly. Diagnostic Information 2-95