Table 1.3 System Level And Field Troubleshooting - Fujitsu MHL2300AT Maintenance Manual

Maintenance and Diagnosis

Table 1.3 System level and field troubleshooting

Check to be made
Confirm that the DC power voltage is within ±5% of the standard value.
DC power voltage
level
When measured at pins 41 and 42 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 disk drive control PCA is set for normal
operation with the host computer. Refer to Section 3.4 of the
MHL2300AT, MHM2200AT, MHM2150AT, MHM2100AT 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.
C141-F043-01EN
1.3 Troubleshooting Procedure
Recommended work
1-11