PCC D3400 - Page 98

TRACK OFFSET MINUS ~
(NLTOMG)
TRACK OFFSET PLUS ~
(NLTOPG)
PLATTER SELECT (NLUPSG)-..
HEAD SELECT (NLUHSG)----'
DECODE
DECODE
POWER CLEAR SIGNAL -----.1
(SPCSA) ,
>TRACK 127~
WRITE DATA SIGNAL~
(IWDSR)
WRITE GATE (lWGXR)--'
ERASF CURRENT----.
GATE (NLECEG)
WRITE DRIVER
AND
ERASE DRIVER
SlOSS---- .... ,
DOUBLE
L.- FREQUENCY
GENERATOR
Ir Ir
HEAD SELECT AMPLlFi::RS
..
-
HEADS AND DIODE MATRIX
READ SWITCH
-
COMPOSITE DATA SIGNAL (RPN)
l--------~~~----~-~------------
,.
VARIABLE
PEAK
READ
FILTER
GAIN
DETECTOR
PRE-
--'"
--
I--
(A=O.5)
AMPLIFIER
-
AND
AMPLIFIER
A=2.6 TO 8)
SQUARER
.---------READ ENABLE CONTROL (NLRECG)
1
READ DATA DECODER
AND
READ DATA CONTROL
._---.. READ DATA (NRRDSG)
----~ READ CLOCK (NRRCSG)
1738
Figure 4-4. Read/Write Electronics,
Functional Block Diagram
4-37/4-38