NEC FD1165 - Index Alignment Check or Adjustment; Index Alignment Oscilloscope Settings

a. Insert the alignment flexible disk and step the
carriage to track 76.
b. Load the heads.
c. Compare the waveform in Figure 5-4 with the waveform
that is displayed on the oscilloscope.
d. If the waveform is not wi thin specifications, re-
place the carriage assembly.
-
A
B
C
0
~
SPEC IFICATION
B~AANDC~ 0
Figure 5-4 Azimuth Waveform
5.4.3 Index Alignment Check or Adjustment
Set the oscilloscope to the settings in Table 5-5, then use
the following procedure to check or adjust the Index align-
ment.
Table 5-5 Index Alignment Oscilloscope Settings
ITEM SETTING
Channel
1 Normal
Channel
2
Inverted
Mode Add
Inputs Ac
Input ra.nge 200
mV/division
Test points TP8
and TP9
Trigger
TP7
(dual-sided)
TPIO
(single-sided)
Time base
0.1 ms/division
Probes xl
5-7