Fujitsu MAU3036NC/NP, MAU3073NC/NP, MAU3147NC/NP manual System-level field troubleshooting

Table 6.2		System-level field troubleshooting
Item		Recommended work
DC power cable	Check that the power cable is correctly connected to the disk drive and
	power supply unit.
DC power level	Check that the DC voltage is within the specified range (±5%).
	Check that +5 VDC supply is 4.75 to 5.25 VDC.
	For NC model, check the voltage between pin 36 and 76 of the SCSI
	connector.
	For NP model, check the voltage between pin 3 and 4 of the power
	connector.
	Check that +12 VDC supply is 11.4 to 12.6 VDC.
	For NC model, check the voltage between pin 1 and 2 of the SCSI
	connector.
	For NP model, check the voltage between pin 1 and 2 of the power
	connector.
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.
Interface cable connection	Check that the SCSI interface cable is correctly connected between the disk
	drive and controller.
Terminating resistors	For a daisy chain connection, check the terminating resistor on the last disk
	drive only. For a star-burst connection, check that the terminating resistor
	is correctly mounted on all disk drives.
Drive selection address	Check that the disk SCSI ID is set correctly.
Plug setup	Check that the jumpers on the PCA are set so that the disk drive and host
	computer operate normally. See Section 5.3.
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.

6-14 C141-E205