4.4.13 Head Load Inspection and Adjustment
Phillips Screwdriver, M3
Allen Wrench, 1.5mm
Exerciser (AVA 409 or equivalent)
Screw Lock Liquid
Set the Head Load jumper selection to HS and set Drive Select to DSO, refer
to Figure 4-1, Table 4-5.
Set the oscilloscope as follows:
Channell: Connect to TP4, AC mode, 0.2V
Channel 2: Connect to TP5, AC mode, 0.2V
Connect to pin-4 of intraconnector
Set Trigger mode to External, on the negative edge
Start the Spindle Motor and load the alignment disk.
Record a pattern of IF (all zero's) on Track 04 (Write Data frequency of
125kHz for the M2552K and 500kHZ for the M2553/54K).
Adjust Channel 2 output waveform, using the oscilloscope's ranges and variable
gain controls, until the amplitude of Level "A" as shown in Figure 4-16 is
equal to 5 divisions.
A - - - -
Figure 4-16 Head Load SignallA"
Refer to Figure 4-17. While selecting and deselecting the drive, measure the
time from head unload to head load. Ensure that the time, from scope trigger
to 90% of maximum amplitude (Leve1
B") is less than 50 milliseconds.
_ _ _
Figure 4-17 Head Load Interval and Signal "8"
TS-021-013087 ••• 01