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 |
|
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|
