Table 1.3 System Level And Field Troubleshooting - Fujitsu MHU2100AT Maintenance Manual

Maintenance and Diagnosis

Table 1.3 System level and field troubleshooting

Check to be made
DC power voltage
Confirm that the DC power voltage is within 5% of the standard value.
level
When measured at pins 41, 42 and 43 of the power supply connector, the
+5 VDC must be 4.75 to 5.25 VDC.
DC power ripple Check that the maximum ripple at +5 VDC power is less than 100 mV
noise peak to peak and 200 mV peak to peak respectively.
Power-interface Confirm that the AT interface cable is properly connected at the disk
cable connection drive, power supply section, and control unit.
Switch setting 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 MHU2100AT Disk Drives Product Manual for switch
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
indefinite error 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
Recommended work
C141-F067-01EN