HP 7936 Support Manual page 11

Contents (continued)
Sampled/Dedicated Select Switch ................................................................... .5-20
Slew Rate Limiter .................................................................................... 5-20
Slew Rate Limit Switch .............................................................................. 5-20
Off-Track Detector ................................................................................... 5-20
Track Crossing Detector .................................................................. " ........... 5-20
Fault Latches .......................................................................................... 5-21
Servo Power Amplifier ................................................................... " ........... 5-21
Amplifier Error Detection ............................................................... , ........... 5-24
Servo System Errors ..................................................................................... 5-25
Track Follower - PLL Errors ......................................................................... 5-25
Seek Errors ............................. " ............................................................. 5-26
Power Amplifier Error ................. , ............................................................. 5-26
Error ReIlOrting ........................ " ............................................................. 5-27
Flowcharts .... " .......... , .................... " ............................................................. 5-27
Read/Write System ........................... , ............................................................. 5-27
Head-Disc Assembly A3 ................................................................................. 5-28
Recording Medil.lm ..................... , ............................................................. 5-28
Read/~'rite Heads .................................................................................... 5-28
Read Preamplifier/Write Driver ICs ... , ............................................................ .5-28
Read/Write PCA-A2 ..................................................................................... 5-29
Read/~rrite Controller IC ............................................................................ 5-29
Head Select Encoder ................................................................................. 5-32
Read Chain ........................................................................................... 5-32
Write Chain .......................................................................................... 5-33
Read/~rrite
System Errors ............................................................................ 5-33
Error Reporting ...................................................................................... 5-34
Spindle Drive System ....... , ............................................................................... 5-34
AC Input (:ircuit ........ , ............................................................................... 5-35
Spindle Motor BI ........................................................................................ 5-35
Primary Power PCA-A8 ................................................................................. 5-35
LINE- Switch ........................................................................................ 5-35
Start Capacitor and Relay ............................................................................ 5-35
Brake V'oltage Source ................................................................................. 5-36
Speed Sensor ............................................................................................. 5-36
Servo PCA-/\1 ........................................................................................... 5-36
Read/Write PCA-A2 ..................................................................................... 5-36
Power Distribution PCA-A5 ............................................................................. 5-36
Power Sl.lpply System ....................................................................................... 5-36
AC Input Circuit ........................................................................................ 5-36
Primary Power PCA-A8 ................................................................................. 5-37
Power Supply PCA-A4 .................................................................................. 5-37
Primary Power Selection ............................................................................. 5-37
Primary Control Circuit .............................................................................. 5-37
Output Section ........................................................................................ 5-37
Fault Detection and Protection ...................................................................... 5-37
Power Distribution PCA-A5 ............................................................................. 5-37
Read/Write PCA-A2 ..................................................................................... 5-37
Servo PCA-,I\'] .......................................................................................... 5-38
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