PCC D3400 - Page 8

TABLE OF CONTENTS (Continued)
Page
6.8.3 X + 0 and X + 90 Signal Polarity and Quadrature Check ........ 6-1S
6.8.4 Heads Retracted Signal Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 6-21
6.8.5 Index Balance ............................................ 6-22
6.S.6 Velocity Transducer Phasing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 6-24
6.8.7 Positioner Voice Coil Polarity Check. . . . . . . . . . . . . . . . . . . . . . . .. 6-25
6.8.S Power-Down Procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 6-25
6.9 Dynamic Positioner AdJustments. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.. 6-26
6.9.1 Positioner Preparation, Dynamic Tests. . . . . . . . . . . . . . . . . . . . . .. 6-26
6.9.2 Dynamic Adjustments .. ; .................................. 6-26
6.9.3 Dynamic Reticle-to-Scale Phase Adjustments. . . . . . . . . . . . . . . .. 6-30
6.9.4 Current Adjustment .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 6-31
6.9.5 Seek-Time Adjustment ..................................... 6-32
6.9.6 Overshoot Test Procedure. . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . .. 6-33
6.9.7 Overshoot Adjustment Procedure
........................... 6-35
6.9.8 Index to Quadrature Clock Relationship ...................... 6-35
6.9.9 Overshoot and Settling Response Procedure. . . . . . . . . . . . . . . . .. 6-39
6.10 Performance Checks. : . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 6-41
6.10.1 Servo and Positioner Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 6-41
6.10.2 Spindle Speed Accuracy Test .. . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 6-41
6.11 Sector Phase-Lock-Loop Adjustment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 6-42
6.11.1 Test Configuration .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 6-43
6.11.2 Test Procedure ........................................... 6-43
6.11.3 Adjustment Procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 6-43
6.12 Read Decode Circuit Adjustments .................................. 6-44
6.12.1 Read Pulse Narrow (RPN) Pulsewidth Adjustment ............. 6-44
6.12.2
'Ones' Window Setting ..................................... 6-45
6.12.3 Data and Clock Pulsewidth ................................. 6-46
6.13 Temperature Compensation (200 tpi Only) ........................... 6-47
6.13.1 Temperature Compensation Tests
and Adjustments. . . . . . . . . . .. 6-47
6.13.2 Scaling Resistor Verification. . . . . . . . . . . . . . . . . . . . . . . . .. . . . . .. 6-48
6.13.3 Environment Temperature Adjustment . . . . . . . . . . . . . . . . . . . . . .. 6-48
6.14 CE Alignment Procedure .......................................... 6-51
6.14.1 Front Loading CE Disk Cartridge .. . . . . . . . . . . . . . . . . . . . . . . . . .. 6-51
6.14.2 Top Loading CE Disk Cartridge .............................. 6-52
6.14.3 CE Cartridge Stabilization .................................. 6-53
6.14.4 Test Configuration - All Models ............................ 6-53
6.14.5 Radial Alignment - Front Load
............................. 6-54
6.14.6 Circumferential Alignment - Front Load
..................... 6-60
6.14.7 Radial Alignment - Top Load .............................. 6-63
6.14.8 Circumferential Alignment - Top Load ...................... 6-67
6.15 Cartridge Interlock System - Front Load Models ..................... 6-69
6.15.1 Checking the Interlock System - Front Load Models ........... 6-69
6.15.2 Adjusting Interlock System ................................. 6-69
6.16 Cartridge Interlock System - Top Load Models ....... , ............... 6-71
6.16.1 Checking the Interlock System. . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 6-72
6.16.2 Adjusting the Interlock System .............................. 6-72
6.17 Bezel and Power Switch ........................................... 6-75
6.17.1 Removal of Bezel ......................................... 6-75
6.17.2
Installation of Bezel .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 6-75
6.17.3 Removal of Power Switch Bracket ........................... 6-75
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