Diagnostics and Maintenance
| Table 6.2 |
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Item |
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| Recommended work |
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DC power level |
| Check that the DC voltage is within the specified range (±5%). | |
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| For +5V DC, measure the voltage between pin P8 (+5V) of the interface | |
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| connector and the nearest PCA mounting screw (GND) from the | |
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| interface connector, and confirm the value is from 4.75 to 5.25 VDC. | |
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| For +12V DC, measure the voltage between pin P14 (+12V) of the | |
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| interface connector and the nearest PCA mounting screw (GND) from | |
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| the interface connector, and confirm the value is from 11.4 to 12.6 VDC. | |
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Electrical noise |
| Make sure the maximum ripple | |
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| 250 mV and +12V DC is within 250 mV. | |
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| Make sure the high frequency noise (over 20 MHz) is less than | |
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| 100 | |
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System cables |
| Check that all system cables are connected correctly. | |
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System diagnostic test |
| When possible, execute the system level diagnostic routine as explained | |
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| in the host computer manual. This gives a detailed report of a possible | |
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| fault. |
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Intermittent or nonfatal errors |
| Check the AC voltage from the power supply. Check the DC voltage | |
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| level at the power connector for the disk drive. | |
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| If the AC voltage level is abnormal or there is a lot of electrical noise, | |
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| notify the user of the error. | |
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| If the DC voltage level is unstable, replace the power supply unit. | |
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| If possible, replace the disk drive. If replacing the disk drive does not | |
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| eliminate the error, the removed disk drive is probably not faulty. To | |
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| continue error analysis, refer to the hardware and software manuals | |
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| supplied with the system. | |
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