Fujitsu MAP3147FC, MAP3735FC manual Diagnostics and Maintenance, System-level field troubleshooting

Diagnostics and Maintenance

	Table 6.2		System-level field troubleshooting
Item			Recommended work
DC power level		Check that the DC voltage is within the specified range (±5%).
		Check that the +5 VDC value (pin of the interface connector) is 4.75 to
		5.25 VDC.
		Check that the +12 VDC supply (pin of the interface connector of disk
		drive) is 11.4 to 12.6 VDC.
Electrical noise		Make sure the maximum ripple peak-to-peak value of +5 VDC is within
		250 mV and +12 VDC is within 250 mV.
		Make sure the high frequency noise (over 20 MHz) is less than
		100 mVp-p.
Drive selection address		Check that the disk drive selection address is set correctly.
System cables		Check that all system cables are connected correctly.
System diagnostic test		When possible, execute the system level diagnostic routine as explained
		in the host computer manual. This gives a detailed report of a possible
		fault.
Intermittent or nonfatal errors		Check the AC voltage from the power supply. Check the DC voltage
		level at the power connector for the disk drive.
		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 disk drive. If replacing the disk drive does not
		eliminate the error, the removed disk drive is probably not faulty. To
		continue error analysis, refer to the hardware and software manuals
		supplied with the system.

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