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Service Guide ML520/521
Chapter 4 Failure & Repair Analysis
4.6.03ALARM/LED Display Troubleshooting Tables
CAUTION:
Always check that all connectors on the printer are making good contact.
Reference | Failure Description | Cause | Recommended Action |
Number |
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1 | Space Motor Alarm | Space motor IPT does | Refer to RAP 02. |
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| not occur in specified |
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| time. |
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2 | Printhead Detection | Printhead does not | Refer to RAP 03. |
| Alarm | home. |
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3 | Printhead A/D Alarm | Thermistor is open or +5 | Check the printhead |
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| vdc shorted. | connection. Then |
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| replace the main control |
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| board the carriage cable |
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| and the printhead. |
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4 | Printhead Gap Alarm | Self adjustment was not | Check the printhead |
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| successful. | connection. Then |
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| replace the main control |
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| board the carriage cable |
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| and the printhead. |
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5 | Printhead Data | Printhead parity | Replace the main control |
| Transfer Alarm | error<R>was not | board the carriage cable |
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| recovered or print head | and the printhead. |
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| was not seated properly. |
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6 | Printhead Type | 24 pin printhead is | Replace the printhead |
| Alarm | connected in a 9 pin | with a 9 pin printhead. |
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| printer. |
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7 | Printhead | Overdrive signal is | Check the printhead |
| Connection Alarm | active but no current is | connection. Then |
| (1) | detected. | replace the main control |
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| board the carriage cable |
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| and the printhead. |
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