System Level And Field Troubleshooting - Fujitsu MPA3022AT Maintenance Manual

Check to be made
DC power cable Confirm that the power cable is properly connected at the disk drive and
power supply section.
DC power voltage Confirm that the DC power voltage is within ±5% of the standard value.
level 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 11.4 to 12.6 VDC.
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.
Interface cable Confirm that the AT interface cable is properly connected at the disk drive
connection and control unit.
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.
System cable Confirm that all cable connections throughout the system correctly
connected.
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.
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.
Table 1.3 System level and field troubleshooting
C141-F019-01EN
Recommended work
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