Table 6.2

System-level field troubleshooting

 

 

 

Item

 

Recommended work

 

 

DC power cable

Check that the power cable is correctly connected to the disk drive and

 

power supply unit.

 

 

DC power level

Check that the DC voltage is within the specified range (±5%).

 

 

 

Check that +5V DC supply is from 4.75 to 5.25V DC.

 

For NC model, check the voltage between pin 36 and 76 of the SCSI

 

connector.

 

For NP model, check the voltage between pin 3 and 4 of the power

 

connector.

 

 

 

Check that +12V DC supply is from 11.4 to 12.6V DC.

 

For NC model, check the voltage between pin 1 and 2 of the SCSI

 

connector.

 

For NP model, check the voltage between pin 1 and 2 of the power

 

connector.

 

 

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.

 

 

Interface cable connection

Check that the SCSI interface cable is correctly connected between the disk

 

drive and controller.

 

 

Terminating resistors

For a daisy chain connection, check the terminating resistor on the last disk

 

drive only. For a star-burst connection, check that the terminating resistor

 

is correctly mounted on all disk drives.

 

 

Drive selection address

Check that the disk SCSI ID is set correctly.

 

 

Plug setup

Check that the jumpers on the PCA are set so that the disk drive and host

 

computer operate normally. See Section 5.3.

 

 

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 disk drive.

 

 

 

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 disk drive. If replacing the disk drive does not

 

eliminate the error, the removed disk drive is probably not faulty. To

 

continue error analysis, refer to the hardware and software manuals

 

supplied with the system.

 

 

 

C141-E226

6-13

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Fujitsu MAW3073NC/NP, MAW3300NC/NP, MAW3147NC/NP manual System-level field troubleshooting

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