24xx
Intermittent Problem Service Check
FRU/Symptom | Action | ||
|
| ||
1 The printer | Check for the following: | ||
sometimes fails | 1. Loose connectors. Reconnect all | ||
before POST is | |||
connectors to the logic board. | |||
complete. | |||
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 | |
|
| ||
|
| 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
