HP 7925D Service Manual page 182

I
ILLUSTRATIONS
Title Page Title
Page
Addressing Structure of an HP 7925H Disc Drive .. A-2
Sector Clock and Index Generation A-3
Logical vs. Physical Sectors A-3
Surface Mode vs. Cylinder Mode A-4
HP 7925H Sector Format A-5
HP 7925H Disc Drive Simplified Block Diagram A-6
Phase Selection Timing A-14
HP 7925H Servo and Data Track Assignments A-19
HP 7925H Air Circulation and
Filtration System A-30
Types of Contaminants and Critical Elements A-31
110
Sector PCA, part no. 07925-60001 A-33
Self-Test Controls and Indicators A-40
HP 7925H Power-Up Troubleshooting Flowchart .. A-48
HP 7925H Integrated Controller,
Functional Diagram A-49
HP 7925H Mainframe Assembly,
Wiring Diagram A-51
HP 7925H Operation Control System,
Functional Diagram A-53
I
TABLES
HP 7925H Spindle Rotation System,
Functional Diagram A-55
HP 7925H Head Positioning System,
Functional Diagram A-57
HP 7925H Sector Sensing System,
Functional Diagram A-59
HP 7925H ReadlWrite System,
Functional Diagram A-61
HP 7925H Fault Detection System,
Functional Diagram A-63
HP 7925D Disc Drive - Part Changes
for HP 7925H A-78
Mainframe Assembly - Part Changes
for HP 7925H A-79
Bit Numbering Notation A-81
Track and Sector Format A-82
Sequence Protocol. " A-83
General Form of Secondary A-84
Title Page Title Page
Controller Mnemonics A-7
Operation Control Command Signals A-II
Status Word Bit Assignments A-ll
Write Current Reduction vs. Cylinder Address A-26
Summary of Timeout Conditions A-27
Fault Events A-28
Self-Test Control Operation
~
A-41
Self-Test Function Test Description A-42
Test Failure Summary A-45
A-iv
Visual Indication of Drive Status A-47
HP 7925H Motherboard PCA-A7
Signal Distribution List A-65
HP 7925H Power Distribution List A-73
HP 7925D Disc Drive - Part Changes
for HP 7925H A-78
Mainframe Assembly - Part Changes
for HP 7925H ' A-79
Controller Secondaries Coding Summary A-83