Table 6.2 |
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|
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 | |
| 250 mV and +12V DC is within 250 mV. | |
|
| |
| Make sure the high frequency noise (over 20 MHz) is less than 100 | |
|
| |
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 | |
| 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 PCBA 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 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. |
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106 |
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