Lexmark 2380 Service Manual - Page 45

FRU/Symptom 2 Machine power sometimes turns off. Action The cause of this problem may be that the power circuit is failing, or the wiring is intermittently open. Check the following in sequence: 1. Check the customer's outlet voltage and be sure it is within tolerance. 2. Check the continuity of the power cord. 3. Disconnect the power supply cable from the connectors CN11 on the main logic board and CN1 on the sub logic board. Turn the printer power on and check all dc output voltages at CP11 and CP1. Be sure the output voltages are as follows: CP11-1 (+26 V dc ±10%) & CP11-2 (GND) CP11-3 (+5 V dc ±5%) & CP11-4 (Signal GND) CP 1-1 (+26 V dc ±10% & CP1-2 (GND) CP 1-3 (+5 V dc ±5%) & CP1-4 (Signal GND) If one of the voltages is 0, go to the "Power Service Check" on page 2-32. If the voltages are not 0 but are incorrect, replace the power supply unit. 3 Intermittently poor Do the following: print quality. • Remove paper jams from the paper path. • Clean all feed roller surfaces. • Clean the ribbon shield and printhead. • Clean the platen surface. • Install the ribbon cartridge correctly. • If the ribbon end of life has been reached, have the customer replace the ribbon cartridge. Diagnostic Information 2-21