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r - - - - - - - - ,
I
DEVICE
I
I
DEPENDENT
I
CONTROLLER
I
PCA-A2
I
- -
- -
- -
- - -
- - -
--- ---
- - - - - -
-.
I
DATA!CONTROL
I
INTERFACE
BUS
I
PLL
I C
READ/MRITE DATA BUS
CONTROL/STATUS DATA BUS
AM
, /
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I
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MICRO-
~x~ EPRO~~~O~ROM ~_1_EPRO~
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PROCESSOR
SELF TEST
SELF TEST
SELF TEST
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CONTROL/STATUS ADDRESS BUS
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DIS C
CONTROLLER
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DlTI
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CONTROL
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L _____ J
FAULT!
ON LINE
INDICATOR
Theory of Operation
7942 and 7946
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-S C-D R-I-V-E -A-1- - - - - - - - - - - - - - - - - - -
- - I
I
I
ST-506
I
INTERFACE
I--------------~
,
SEALED HEAD-DISC ASSEMBLY
I
~
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I
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I
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I
I
I
I
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NFM R/M DATA
MICRO-
PROCESSOR
&
PLA
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fW,
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AT A
CHANNEL
, NFl! R/M
READ
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DAlA
PREAMP!
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WRITE
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DRIVER IC'S
, . . . - - - - - - - - ,
ACTU~TOR
R/M
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DRIVE
HEADS
DISCS
DATA
ACTUATOR
SERVO
CONTROL
SPINDLE
SPEED
CONTROL
:
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:
ACTUATOR
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:
DA
TA
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SERVO
SERVO
SERVO
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S E R V 0
PREAMP
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SPINDLE DRIVE
MOTOR
SPINDLE
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AIR FILTRATION
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L ____________
-1 ______
C_O_M P_O_N _E N_T _S _ _ _
-1..----1
Figure 3-4. Disc Drive, Block Diagram
3-33/3-34
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