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3.6 SEEK OPERATIONS TESTING
A repeat seek or a one-cylinder seek operation can be initiated by connecting strapping
wire to TPI.
3.6.1 Repeat Seek Operation
A repeat seek operation seeks from the low cylinder (cylinder 000) to the high cylinder
(cylinder 691), and then from the high cylinder back to the low cylinder. To perform a
repeat seek operation, connect wires to TPI as shown in Figure 3-3.
5
0
10
?
TP1 TESTPOINT
o
o
o
o
IF PINS 6 AND 7 ARE CONNECTED, THE SEEK
INTERVAL TIME IS 100 MILLISECONDS.
Figure 3-3 Repeat Seek Using TPI
3.6.2 One-Cylinder Seek Operation
A one-cylinder seek operation seeks from cylinder 000, to cylinder 001, to cylinder 002,
and continues to the high cylinder. From the high cylinder, the unit seeks to cylinder 690,
to cylinder 689, and continues back to the low cylinder. To perform a one-cylinder seek
operation, connect wires to TPI as shown in Figure 3-4.
5
0
10
0
TP1 TESTPOINT
o
?
o
o
IF PINS 6 AND 7 ARE CONNECTED, THE SEEK
INTERVAL TIME IS 1.5 SECONDS.
Figure 3-4 One-Cylinder Seek Using TPI
3-18
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