O Track Sensor Adjustment; Azimuth Check - AMSTRAD PC1512 Service Manual

2
Tracks
at
the
minimum
access time
between
5-3
Track Sensor Adjustment
a)
INsert a
CE
diskette.
b)
Continuously
seek between and
tracks
of
DFC222A
specifications.
c)
Adjust the track sensor assembly so
that the step signal
and
track
one
are
always on
the
timing as
shown
in
Figure 5-3.
Then
secure
with
a screw.
Measuring Conditions
Channel 1-TP4
(0.2V/div)
MODE-DUAL
Channel 2-TP8
(0.2V/div)
Sweep-10ms/div
A
Step Signal
TK Signal
2TK
1TK QTK 1TK
2TK
Direction
J
5-4
Azimuth Check
a)
Insert a
CE
diskette.
b)
Move
the
head
to
Track
34 and check
that
the
azimuth waveforms
of
the top
and bottom heads
are as described
in
Figure 5-4.
c)
Exchange
the
head assembly
if
the
azimuth
of
one
of
the top
and bottom heads
is
not as
shown
in
Figure 5-4.
Measuring
Conditions
Channel 1-TP1 (10mV/div)
MODE-ADD
Channel 2-TP2 (10mV/div)
Sweep-1
ms/div
Trigger—
TP6
<\
L) Wher.
a>d
(negative")
v..
=- V,
Shows
tiinuta
2"> Vher.
a<d (positive)
Ymsz be c2c.
abed
Shows misalignment by -IS'.
Shows misalignment bv +13'
Head azimuth
«
0°-18'.
Fig. 5-4
12