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Fujitsu M255XK Customer Engineering Manual page 57

5 1/4" mini-flexible disk drive
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7.
If the Head Load Interval is greater than 50 milliseconds, adjust the head
height using the 1.5mm Allen wrench, as shown in Figure 4-1B below, and
repeat steps 5 and 6.
B.
Seek the heads to Track 79 and repeat steps 4, 5 and 6.
Head load
Figure 4-18 Head Load Adjustment Screw
A fter completing the above procedures check the unload level as follows:
9.
Use the oscilloscope to measure Channel 2 output waveform "A" with the disk
drive selected, refer to Figure 4-19.
---tA - - - -
Figure 4-19 Head Unload Signal nAn.
10. Use the oscilloscope to measure Channel 2 output waveform "B" with the disk
drive deselected, refer to Figure 4-20.
--------
-----
Figure 4-20 Head Unload Signal "B"
11.
Check that B/A
X
100
(%)
is within the specified range, repeat for Track 79.
12.
If
the head load or unload level is out of specification (see Figure 4-17),
readjust the Head Load Adjustment Screw (see step 7 above) and then repeat
steps 4 through
11
as required.
13. Coat the head of the adjustment screw with screw lock and return the HS
jumper to its original position.
TS-021-0130B7 ••• 01
4-25

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