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Maintenance and Diagnosis
1-12 C141-F071
Table 1.3 System level and field troubleshooting
Check to be made Recommended work
DC power voltage
level
Confirm that the DC power voltage is within ±5% of the standard value.
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
noise
Check that the maximum ripple at +5 VDC power is less than 100 mV
peak to peak and 200 mV peak to peak respectively.
Power-interface
cable connection
Confirm that the AT interface cable is properly connected at the disk
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 MHV2100AH, MHV2080AH, MHV2060AH,
MHV2040AH Disk Drives Product Manual for switch setting.
System cable Confirm that all cable connections throughout the system correctly
connected.
System diagnostic
test
To further isolate the failure, if it can be done, execute the system level
diagnostic routine described in the host computer manual.
Intermittent or
indefinite error
Check the AC voltage level at the power supply section and recheck the
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.