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r"',
'-_/'
C~)
~",
'
. .
r-",
(
\
\~
6.
7.
8.
9.
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.
Select the READ LOOP command and, for this
example, select M FM mode, cylinder 24, head 1,
sector length
=
256,
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,
for· this example, set the Address/Data switches
(CE panel) to 0093 to display byte 93.
The loss of amplitude can be seen on the oscilloscope.
r'I • •
~.
I
=--'-'J:::::J~
!
11
Example 2: To scope a damaged track (contains all
ones in the 10 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 test pin TPB-9 (+index).
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 CM N 0 option.
The following oscilloscope screen image shows the
damaged area of the diskette.
1 Track
Damaged Area
25·996
53FD Diskette Drive
61
•
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