Maintenance and Diagnosis
| Table 1.3 System level and field troubleshooting |
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Check to be made | Recommended work |
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DC power voltage | Confirm that the DC power voltage is within ±5% of the standard value. |
level | When measured at pins 41, 42 and 43 of the power supply connector, the |
| +5 VDC must be 4.75 to 5.25 VDC. |
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DC power ripple | Check that the maximum ripple at +5 VDC power is less than 100 mV |
noise | peak to peak and 200 mV peak to peak respectively. |
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Confirm that the AT interface cable is properly connected at the disk | |
cable connection | drive, power supply section, and control unit. |
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Switch setting | Confirm that the switch on the interface connector at the disk drive |
| control PCA is set for normal operation with the host computer. Refer to |
| Section 3.4 of the MHV2120AT, MHV2100AT, MHV2080AT, MHV2060AT, |
| MHV2040AT Disk Drives Product Manual for switch setting. |
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System cable | Confirm that all cable connections throughout the system correctly |
| connected. |
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System diagnostic | To further isolate the failure, if it can be done, execute the system level |
test | diagnostic routine described in the host computer manual. |
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Intermittent or | Check the AC voltage level at the power supply section and recheck the |
indefinite error | DC voltage level at the disk drive power supply connector. |
| If the AC voltage level is abnormal, or if there is a lot of electrical noise, |
| notify the user. |
| If the DC voltage level is unstable, replace the power supply section. |
| If possible, replace the disk drive. If the fault remains, the disk drive is |
| not the case. For suggestions to isolate the failure further, refer to the |
| hardware and software manuals provided with the system. |
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