Fujitsu M255XK Customer Engineering Manual page 57

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