Table 6.2 System-Level Field Troubleshooting - Fujitsu MBA3147RC - Enterprise 147 GB Hard Drive Product Manual

Item
DC power level
Electrical noise
System cables
System diagnostic test
Intermittent or nonfatal errors
C141-E252
Table 6.2 System-level field troubleshooting
Check that the DC voltage is within the specified range (±5%).
For +5V DC, measure the voltage between pin P8 (+5V) of the interface
connector and the nearest PCBA mounting screw (GND) from the
interface connector, and confirm the value is from 4.75 to 5.25 VDC.
For +12V DC, measure the voltage between pin P14 (+12V) of the
interface connector and the nearest PCBA mounting screw (GND) from
the interface connector, and confirm the value is from 11.4 to 12.6 VDC.
Make sure the maximum ripple peak-to-peak value of +5V DC is within
250 mV and +12V DC is within 250 mV.
Make sure the high frequency noise (over 20 MHz) is less than
100 mVp-p.
Check that all system cables are connected correctly.
When possible, execute the system level diagnostic routine as explained
in the host computer manual. This gives a detailed report of a possible
fault.
Check the AC voltage from the power supply. Check the DC voltage
level at the power connector for the HDD.
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 HDD. If replacing the HDD does not eliminate
the error, the removed HDD is probably not faulty. To continue error
analysis, refer to the hardware and software manuals supplied with the
system.
6.4 Troubleshooting
Recommended work
75