NEC FD1165 - 5.2 Head Unload Delay

5.1.1 Auto Tap Test
The auto tap test consists of a head load/head unload
action. To initiate the auto tap test, use the following
procedure.
a. Turn off the power to the disk drive.
b. Connect diagnostic pin T2 to the center pin.
c. Select head load jumper position HL2 and connect HL2
to ground.
d. Turn on the power to the disk drive to start the
auto tap test.
5~1.2 Auto Seek Test
The auto seek test consists of a continuous track seek, from
tr ack 0 to tr ack 76, with the read/wr i te heads unloaded.
Select the auto seek test as follows.
a. Turn off the power to the disk drive.
b. Connect diagnostic pin T3 to the center pin.
c. Turn on the power to the disk drive to start the
auto seek test.
5.1.3 Auto Seek and Auto Tap Test
The auto seek and auto tap test performs the auto seek and
auto tap functions simultaneously. Select the auto seek and
auto tap test as follows.
a. Turn off the power to the disk drive.
b. Connect diagnostic pins T2 and T3 to the center pin.
c. Select head load jumper position HL2 and connect HL2
to ground.
d. Turn on the power to the disk drive to start the
auto seek and auto tap test.
5.2 HEAD UNLOAD DELAY
To delay the head unload action by 250 ms, short pin Tl (see
Figure 5-1) to ground. With Tl shorted to ground, rapid
head load/unload actions (less than 250 ms apart) cannot
occur. Normally this pin is open.
5-2