Fujitsu MBA3147RC Product Manual - Page 79
Troubleshooting, Table 6.2, System-level field troubleshooting
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6.4 Troubleshooting Table 6.2 System-level field troubleshooting Item DC power level Electrical noise System cables System diagnostic test Intermittent or nonfatal errors Recommended work Check that the DC voltage is within the specified range (±5%). For +5V DC, measure the voltage between pin P8 (+5V) of the interface connector and the nearest PCBA mounting screw (GND) from the interface connector, and confirm the value is from 4.75 to 5.25 VDC. For +12V DC, measure the voltage between pin P14 (+12V) of the interface connector and the nearest PCBA mounting screw (GND) from the interface connector, and confirm the value is from 11.4 to 12.6 VDC. Make sure the maximum ripple peak-to-peak value of +5V DC is within 250 mV and +12V DC is within 250 mV. Make sure the high frequency noise (over 20 MHz) is less than 100 mVp-p. Check that all system cables are connected correctly. When possible, execute the system level diagnostic routine as explained in the host computer manual. This gives a detailed report of a possible fault. Check the AC voltage from the power supply. Check the DC voltage level at the power connector for the HDD. If the AC voltage level is abnormal or there is a lot of electrical noise, notify the user of the error. If the DC voltage level is unstable, replace the power supply unit. If possible, replace the HDD. If replacing the HDD does not eliminate the error, the removed HDD is probably not faulty. To continue error analysis, refer to the hardware and software manuals supplied with the system. C141-E252 75