Diagnostics and Maintenance
6.4.3Troubleshooting at the repair site
For maintenance at this level, we recommend additional testing of the HDD and signal checking.
The sense data posted from the HDDs help with troubleshooting. This sense data makes the error type clear (functional, mechanical, or electrical error). Chapter 7 error analysis by sense data, and gives supplementary information on finding the error cause (faulty part).
Table 6.3 lists how to detect a faulty HDD subassembly. This fault finding requires a working host computer or HDD test equipment to recreate the error conditions.
If the detected error cannot be recreated in an ordinary test, HDD conditions can be changed to force the error to recur. This is done by changing the DC voltage or the ambient temperature of the HDD.
If the error does not recur with changed conditions, the HDD is not faulty. If no error occurs in the HDD test, notify the user of the test results, and find out from the user the environment conditions where the HDD is used.
| Table 6.3 | HDD troubleshooting |
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Item |
| Recommended action |
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| |
Frequent or repeated seek errors | Collect sense data, and see Chapter 7. | |
| Replace the HDD, and check that the test method is correct. If the | |
| error recurs, it is likely that the HDD is normal but the test method is | |
| incorrect. |
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| |
Intermittent or nonfatal errors | Replace the HDD, and check that the test method is correct. If the | |
| error recurs, it is likely that the HDD is normal but the test method is | |
| incorrect. |
|
| To check performance, change the HDD conditions by changing the | |
| voltage or temperature. | |
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If the HDD error recurs or a possibly faulty part is found by troubleshooting, return the complete HDD to Fujitsu for repair. A media defect list must be included with the HDD returned to Fujitsu.
If the possibly faulty part is the DE, return the whole HDD to Fujitsu for repair. Also if a clear error (erroneous servo track information or noisy HDD) is detected in the DE, return the whole HDD to Fujitsu. A media defect list must be included with the HDD returned to Fujitsu.
Damage
•Never remove any labels from the HDD or deface them in any way.
•Never open the HDD for any reason. Doing so will void any warranties.
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