NEC D2246 Maintenance Manual page 6

Illustrations
Figure Title Page
1-1 D2246 Major Components. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 1-1
1-2 D2246 Disk and Read/Write Head Arrangement. . . . . . . . . . . . . . . . . . .. 1-2
1-3 D2246 Servo Disk Surface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 1-3
1-4 D2246 Functional Block Diagram ................................ 1-4
1-5 Daisy-Chain System Configuration ............................... 1-6
1-6 Radial System Configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 1-7
2-1 D2246 Packaging. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 2-1
2-2 G9QST Terminating Resistor and Jumper Locations ................ 2-2
2-3 Terminating Resistors in Radial System. . . . . . . . . . . . . . . . . . . . . . . . . . .. 2-2
2-4 Individual Drive Termination/Daisy-Chain System. . . . . . . . . . . . . . . . .. 2-3
2-5 Last Drive Termination/Daisy-Chain System. . . . . . . . . . . . . . . . . . . . . .. 2-3
2-6 DIP Switch Assembly Locations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 2-4
2-7 Installation DIP Switch ......................................... 2-5
2-8 Control Mode DIP Switch. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 2-6
2-9 Sector Select Switch ............................................ 2-7
2-10 Sector Allocation. . . .. . . . . . . .. . ... . .. . . . .. . .. ... . . .. . . .. .. ... . .. 2-7
2-11 Mounting Bracket .............................................. 2-16
2-12 Horizontal and Vertical Installation ............................... 2-16
2-13 Interface Cable Connections ..................................... 2-17
2-14 Cable A/Daisy-Chain System .................................... 2-17
2-15 Signal Ground and Power Connections . . . . . . . . . . . . . . . . . . . . . . . . . . .. 2-18
2-16 Lock Control Assembly ......................................... 2-18
3-1 Troubleshooting Flowcharts ..................................... 3-2
3-2 G9QST Test Point Locations ..................................... 3-13
3-3 Repeat Seek Using TPI .......................................... 3-18
3-4 One-Cylinder Seek Using TPI .................................... 3-18
4-1 D2246 Board Cover. . . . . . . . . . .. . .. . . . . . . . .. . . . .. . . . .. .. .. . . .. .. 4-2
4-2 G9QST Cable Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 4-2
4-3 D2246 Air Separators. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 4-3
4-4 G9QSN Cable Connectors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 4-4
4-5 G9QSQ Cable Connectors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 4-5
4-6 D2246 Fan. . . . .. . . . . .. . . . . . . . . . . . . . . . . . . .. . . . .. . . . . . .. . . . . . . .. 4-5
4-7 D2246 Stator Assembly ......................................... 4-6
5-1 Servo Offset and Seek Speed Adjustment Test Points ................ 5-2
5-2 Servo Offset Waveform ......................................... 5-2
5-3 Seek Speed Waveform .......................................... 5-2
5-4 Transient Response Waveform ................................... 5-3
5-5 Increment Seek (Cylinder 000 to Cylinder 691) Waveform. . . . . . . . . . .. 5-4
6-1 D2246 Standard Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 6-2
6-2 D2246 Head/Disk Enclosure (External Parts) ...................... 6-4
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