Lexmark Forms Printer 2400 Service Manual - Page 36
Intermittent Problem Service Check, FRU/Symptom, Action
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24xx Intermittent Problem Service Check FRU/Symptom 1 The printer sometimes fails before POST is complete. Action Check for the following: 1. Loose connectors. Reconnect all connectors to the logic board. 2. Electrical noise or static discharge. Check the following: • Power supply ground. • Printer frame ground. • Printer interface cable is grounded and shielded. 3. Intermittently low voltages. Check for ac and all dc voltages and short circuits on the logic board. a. Check the user's outlet voltage and ensure that it is within tolerance. b. Check the continuity of the power cord. c. Disconnect the power supply cable from connector CN12 on the logic board. Turn the printer power on and check all dc output voltages at CN12-1, CN12-2, and CN12-6. Verify the following output voltages: CN12 - 1 (+40 V dc ±10%) CN12 - 2 (+40 V dc ±10%) CN12 - 3 (GND) CN12 - 4 (GND) CN12 - 5 (Signal GND) CN12 - 6 (+5 V dc ±5%) CN12 - 7 (Power Save Mode) • If the voltages are incorrect, replace the power supply. • If the failure remains, replace the logic board. Note: When replacing the logic board, always reset the bidirectional print adjustment. See "Bidirectional Print Adjustment" on page 4-4. 2-18 Service Manual