Fujitsu MHV2080AH Manual/User Guide - Page 26

Maintenance and Diagnosis Table 1.3 System level and field troubleshooting Check to be made Recommended work DC power voltage level DC power ripple noise Power-interface cable connection Confirm that the DC power voltage is within ±5% of the standard value. When measured at pins 41, 42 and 43 of the power supply connector, the +5 VDC must be 4.75 to 5.25 VDC. Check that the maximum ripple at +5 VDC power is less than 100 mV peak to peak and 200 mV peak to peak respectively. Confirm that the AT interface cable is properly connected at the disk drive, power supply section, and control unit. Switch setting System cable 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 MHV2100AH, MHV2080AH, MHV2060AH, MHV2040AH Disk Drives Product Manual for switch setting. Confirm that all cable connections throughout the system correctly connected. System diagnostic test Intermittent or indefinite error To further isolate the failure, if it can be done, execute the system level diagnostic routine described in the host computer manual. Check the AC voltage level at the power supply section and recheck the 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. 1-12 C141-F071