Alignment Checks - AMSTRAD CPC664 Service Manual

ALIGNMENT CHECKS
500usec
Fig.
5-1 Index burst
waveform
Amplitude
ratio (%)
uu
80
60
40
20
^
b)
b)
10
20
30
40
Amount
of
Off-center
(u)
Fig.
5-2 Off-centre
calibration
curve
(Effective
width
of
read
head
is
180u)
Inner-,
b/a x
100%
Outer:
a/bx 100%
50
Fig.
5-3
Azimuth
burst
-48'
-72' +48'
°--e-s-
+
72'
-B-
Fig.
5-4
shows
azimuth
burst
in
the
cases
of
azimuth
-1 2',
0'
and +1
2.
T3