Tandon TM100-1 Operating And Service Manual page 48

NOTE
The alignment diskette and drive
must be allowed to stabilize at
room temperature for one hour
before checks and adjustments
are performed.
RADIAL TRACK ALIGNMENT CHECK
1 . Set up the oscilloscope:
Channel A: Test Point 1
Channel B: Test Point 2
Ground: Test Point 10
Read Differentially: A plus B, B inverted
Time Base : 20 milliseconds per division
External Trigger: Test Point 7 , positive
FIGURE 5-5
HUB CENTER LINE AND TRACK LOCATION
edge
Adjust amplitude for at least four divi­
sions on the oscilloscope, A. C. coupled.
2 . Apply power to the drive.
The Track 16 radius is 1.9167
inches from the center of the hub.
Other track locations are comput­
ed based upon 48 TPI.
3 . Select the drive.
4. Insert a certified alignment diskette,
Dysan Number 224/2A, into the drive.
5 . Select Head 0 , the lower head.
6 . Read Track 16 for Radial Track align­
ment of the lower head.
7 . Adjust the oscilloscope to observe a Cats
Eye pattern (Figure 5-6).
8 . Verify the smaller of the two Cats Eye
patterns is not less than 75 percent in
amplitude of the other one.
5-6
NOTE