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C141-E134-01EN xi
6.3.3 Diagnostic test .............................................................................................................................6-12
6.4 Troubleshooting Procedures........................................................................................................6-13
6.4.1 Outline of troubleshooting procedures.........................................................................................6-13
6.4.2 Troubleshooting with disk drive replacement in the field............................................................6-13
6.4.3 Troubleshooting at the repair site ................................................................................................6-15
6.4.4 Troubleshooting with parts replacement in the factory................................................................6-16
6.4.5 Finding possibly faulty parts........................................................................................................6-16
CHAPTER 7 ERROR ANALYSIS .....................................................................................................7-1
7.1 Error Analysis Information Collection...........................................................................................7-1
7.1.1 Sense data......................................................................................................................................7-1
7.1.2 Sense key, sense code, and subsense code.....................................................................................7-1
7.2 Sense Data Analysis.......................................................................................................................7-3
7.2.1 Error information indicated with sense data ..................................................................................7-3
7.2.2 Sense data (3-0C-03), (4-40-xx), (4-44-xx), and (4-C4-xx)...........................................................7-4
7.2.3 Sense data (1-1x-xx), (3-1x-xx) and (E-1D-00): Disk read error..................................................7-4
7.2.4 Sense data (5-2x-xx), (5-3D-00), (5-90-00), (B-47-xx), (B-49-00), (B-4D-xx)
and (B-4E-00): SCSI interface error.............................................................................................7-4
CHAPTER 8 PRINCIPLE OF OPERATION ...................................................................................8-1
8.1 Outline...........................................................................................................................................8-1
8.2 Disk Drive Configuration ..............................................................................................................8-1
8.2.1 Disks..............................................................................................................................................8-2
8.2.2 Heads.............................................................................................................................................8-2
8.2.3 Spindle mechanism........................................................................................................................8-2
8.2.4 Actuator.........................................................................................................................................8-2
8.2.5 Air filters........................................................................................................................................8-2
8.3 Circuit Configuration.....................................................................................................................8-3
8.4 Power-On Sequence.......................................................................................................................8-5
8.5 Factory-Calibration........................................................................................................................8-6
8.6 Read/Write Circuit.........................................................................................................................8-7
8.6.1 Head IC..........................................................................................................................................8-7
8.6.2 Write circuit...................................................................................................................................8-7
8.6.3 Read circuit....................................................................................................................................8-9
8.7 Servo Control.................................................................................................................................8-9
8.7.1 Servo control circuit ......................................................................................................................8-9
8.7.2 Servo format ................................................................................................................................8-10