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6.4 Troubleshooting
C141-E252 75
Table 6.2 System-level field troubleshooting
Item Recommended work
DC power level 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.
Electrical noise 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.
System cables Check that all system cables are connected correctly.
System diagnostic test When possible, execute the system level diagnostic routine as explained
in the host computer manual. This gives a detailed report of a possible
fault.
Intermittent or nonfatal errors 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.