HP 7936 Support Manual page 10

Contents (continued)
HP-IB Cabling ............................................................................................ 3-4
HP-IB Device Address .................................................................................... 3-5
Chapter 4
Page
4-1 Preventive Maintenance
Introduction ................................................................................................. 4-1
Chapter
5
Page
5-1 Functional Description
Introduction ................................................................................................. 5-1
Block Diagrams .............................................................................................. 5-2
Signal Notation .............................................................................................. 5-2
List of Mnemonics ........................................................................................... 5-2
Disc Format ................................................................................................. 5-3
Addressing Structure ......................................................................................... 5-7
Addressing Mode ............................................................................................ 5-7
Disc Sparing ................................................................................................. 5-7
Sector Sparing ............................................................................................ 5-7
Track Sparing ............................................................................................. 5-8
Controller PCA-A6 .......................................................................................... 5-8
Servo System ................................................................................................ 5-11
Head-Disc Assembly A3 ................................................................................. 5-12
Dedicated Servo Code ................................................................................ 5-12
Sampled Servo Code .................................................................................. 5-13
Servo Head .......................................................................................... 5-13
Servo Read Preamplifier/Write Driver IC ........................................................... .5-13
Drive ID Circuit ...................................................................................... 5-13
Head Gain Reference PROM and DAC .............................................................. 5-14
Actuator .....................................................
~
..
~
....................................... 5-14
Speed Sensor .......................................................................................... 5-14
Read/Write PCA-A2 ..................................................................................... 5-14
Dedicated Servo AGC Amplifier. .................................................................... 5-14
Sampled Servo Switch ................................................................................ 5-15
Sampled Servo AGC Amplifier ....................................................................... 5-15
Servo PCA-Al ........................................................................................... 5-15
Servo Controller ...................................................................................... 5-15
2-Bit ADC ............................................................................................ 5-16
Dedicated Servo AGC Circuit. ....................................................................... 5-17
Sampled Servo AGC Circuit .......................................................................... 5-17
Sector Mark Decoder ................................................................................. 5-17
Dedicated Servo Circuit .............................................................................. 5-17
Sampled Servo Circuit ................................................................................ 5-19
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