Read Circuit Block Diagram - Tandon TM-100-1 Operating And Service Manual

The Read signal is presented to IC SD, which is another edge detector, and then goes to IC SE, where the pulses
are shaped to 1 usec. This output is gated at IC 1 F with the Unit Select signal to produce a digital output at Pin 30
of the interface connector (see Figure 3-14) .
L
NOTE
IC SE, the final one shot, is enabled only when the disk drive is in a
Read state (Pin 11 ).
UPPER
HEAD
LOWER
HEAD
DIFFERENTIATOR
(IC4A)
DIGITIZER
(IC 5D, 5E)
UNIT SELECT
TEST POINT 3
TEST POINT 4
READ AND HEAD
SWITCHING
CIRCUITS
CROSSOVER
DETECTOR
(IC5B)
1 - - - - - - - 1 •
DATA OUTPUT
Figure 3-14
Read Circuit Block Diagram
3-17
SIGNAL
AMPLIFIER
(IC3A)
COMPARATOR
(IC 5B, 5C, 5D)
TEST POINT 1
TEST POINT2