AMSTRAD CPC664 - Page 14

ALIGNMENT
CHECKS
(cont)
MEDIA 300us
500us
2F
(125kHz
INDEX
Difference between
Track 00
and 39
is
within
18us
(2')
Fig.
2 Waveform
of T39
(Index pattern
-
Radial
alignment)
1.8ms
-500us
0.6 ms
-0.1ms
100*
INDEX
I.B
1
2
3
2F(125kHz)
Fig. 3
Waveform of
T39 (Azimuth,
alignment)
12.0
0.5
3.5
0.5 3.5
0.5
+72'-48'+48'-72'
L
BLOCK
1 BLOCK 2 BLOCK 3
J
L
BLOCK
47
l
Index
Aximuth burst
burst
47 pair
servo-patters
for positioning use
Fig.
4 Waveform of T39
14