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6.
7.
8.
Select a recalibrate and, for this example, a seek
to track 24 from the diskette exerciser test 1
command menu (enter an E after selecting the
cylinder number).
Use the default option to execute the commands.
Press the Attn key (3 times) to return to the
diskette exerciser test 1 command menu.
9.
Select the READ LOOP command and, for this
example, select FM mode, cylinder 24, head 1,
sector length = 128, sector 11, and M / S data field
1 from the displays (enter an E after selecting the
sector number).
10.
Select the LOOP ON CMND TABLE option and
turn the Address/Data switches (CE panel) from
0000 to 0010 to 0020 and so on until the failure is
located.
The loss of amplitude can be seen on the oscilloscope.
"'=~-'··~[:r·
...
!
.
11
Example 2: To scope a damaged track (contains all
ones in the ID field), the following changes must be
made to the preceding procedure:
1.
2.
3.
4.
5.
Set the Times Per Division on the oscilloscope to
20 ms/cm.
Connect the trigger to the +Index test pin on the
old type file card. (Connect the trigger to TPB-14
on the new type file card.)
In step
6
of example 1, seek to the damaged
cylinder.
In step
9
of example 1, select the READ 1
SECTOR ON CURRENT CYL command (select the
mode, head, sector length, sector number, M/S
data field, and cylinder number that you want to
scope).
In step 10 of example 1, select the SCOPE LOOP
A CMND option.
The following oscilloscope screen image shows the
damaged area of the diskette.
I
I
1 Track
I
I
I···L·~····
............ .
--
.......
~
...
Damaged Area
36
23-319
\
........
,.
c
· · . . . . . . .
...... ,.
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