6-14
C141-E205
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.
Check that the DC voltage is within the specified range (±5%).
Check that +5 VDC supply is 4.75 to 5.25 VDC.
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.
DC power level
Check that +12 VDC supply is 11.4 to 12.6 VDC.
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.
Make sure the maximum ripple peak-to-peak value of +5 VDC is within
250 mV and +12 VDC is within 250 mV.
Electrical noise
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.
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.
Intermittent or nonfatal errors
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.
Содержание MAU3036NC
Страница 1: ...C141 E205 01EN MAU3147NC NP MAU3073NC NP MAU3036NC NP DISK DRIVES PRODUCT MAINTENANCE MANUAL ...
Страница 10: ...This page is intentionally left blank ...
Страница 26: ...This page is intentionally left blank ...
Страница 34: ...This page is intentionally left blank ...
Страница 50: ...This page is intentionally left blank ...
Страница 72: ...4 22 C141 E205 IMPORTANT Do not connect the external LED to both CN1 and CN2 Connect it to either of them ...
Страница 96: ...This page is intentionally left blank ...
Страница 122: ...This page is intentionally left blank ...
Страница 126: ...This page is intentionally left blank ...
Страница 128: ...This page is intentionally left blankw ...
Страница 129: ......
Страница 130: ......