Lexmark C750 Service Manual - Page 135
Lexmark C750 Manual
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5060-00x 990 Service error This error indicates which option is causing the error. 5-Bin mailbox Step 1 Action and questions Mechanical linkage/DC motor assembly-make sure the DC motor cable connector is installed at J2 on the control board. Is the cable connected correctly? 2 Resistance check-disconnect J2 from the option board and check the resistance of the motor on the cable connector between J2-1 and J2-2. The resistance measures between 115 and 135 ohms. Is the resistance correct? 3 DC motor-check between J2-1 and between J2-2 and the case of the DC motor for shorts. Is the DC motor-shorted? Note: If the DC motor is shorted, damage may result to the Control board. 4 Output Expander control board check-disconnect the motor cable J2 and check the voltages at J2 on the board. Warning: Be careful not to short to adjacent pins on the connector. Note: All voltages are approximate values. Pins J2-1 J2-2 J2-3 J2-4 Voltages (motor idle) +24 V dc +24 V dc +5 V dc +5 V dc Yes Go to step 2 No Reseat the cable and recheck for correct operation of the option Replace the mechanical linkage/DC motor assembly Go to step 3 Replace the mechanical linkage/DC motor assembly Go to step 4 Replace the control board Replace the mechanical linkage/DC motor assembly Are the voltages correct? Diagnostic information 2-101