| Table 1.3 System level and field troubleshooting |
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Check to be made | Recommended work |
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DC power cable | Confirm that the power cable is properly connected at the disk drive and |
| power supply section. |
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DC power voltage | Confirm that the DC power voltage is within ±5% (+5 VDC) or ±8% (+12 |
level | VDC) of the standard value. |
| When measured at pins 3 and 4 of the power supply connector, the +5 VDC |
| must be 4.75 to 5.25 VDC. |
| When measured at pins 1 and 2 of the disk drive power supply connector the |
| +12 VDC must be 11.04 to 12.96 VDC. |
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|
DC power ripple | Check that the maximum ripple at +5 and +12 VDC power is less than |
noise | 100 mV peak to peak and 200 mV peak to peak respectively. |
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|
Interface cable | Confirm that the AT interface cable is properly connected at the disk drive |
connection | and control unit. |
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Switch setting | Confirm that the switch on the switch on the disk drive control PCA is set |
| for normal operation with the host computer. Refer to Section 3.4 in Product |
| Manual for switching 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 DC |
indefinite error | 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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