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| 6.4 Troubleshooting Procedures | |
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| Table 6.2 |
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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 +5 VDC, measure the voltage between pin 20 (+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 +12 VDC, measure the voltage between pin 2 (+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 +12 VDC 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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| Drive selection address |
| Check that the disk drive selection address is set correctly. |
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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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