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Radio Shack TRS-80 III User Manual

Radio Shack TRS-80 III
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HEAD
RADIAL
ALiGNMENT/CE
ALIGNMENT
1. Insert a 5
1/4"
alignment
diskette.
2.
Connect
Scope:
Channel A
to
TP
1
Channel B
to
TP
2
Ground
to
TP 10
Ext.
Sync
to
TP
7
Set
mode
to
add
(A +
B)
Invert B
Vert.
to
50
MV
/div
Trigger external - loosely.
3.
Read
track
16
and
verify
the
II
ca
t
eyes"
pattern
as
shown
in
Figure
11.
The smaller
of
the
two
lI
eyes
"
should
not
be less
than
75%
amplitude
of
the
other.
% = (small lobe/larger lobe) x 100.
4.
Step
to
track
(30.
Return
to
track
16
and re-verify
the
pattern.
5.
Step
to
track
34/40
and
return
to
track
16.
Re-
verify
the
II
ca
t
eyes"
pattern.
If
Radial Needs
Adjustment:
a. Loosen
the
two
retaining screws
on
back
of
the
unit
and
the
retaining screw
on
the
carriage as-
sembly.
b.
Turn
the
Adjustment
Cam until
the
"cat
eyes"
pattern
is
with
in
75%.
If
the
pattern
does
riot
come
within spec, loosen
the
hex
head screw
on
the
collar
of
the
stepper
motor
and
rotate
the
stepper
motor
shaft until
the
"eyes"
are
to
the
75% level. Tighten
the
hex head screw
and
return
to
step
a.
TIME
SCALE
=
20m
sec
Div
EQUAL
AMPLITUDE
(on
Track
16)
c. Tighten all screws and recheck
adjustment.
FIGURE 11.
"CAT
EYES"
PATTERN
MODULE
ADJUSTMENT
CAM
FIGURE 12.
RADIAL
ADJUSTMENT
109

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Radio Shack TRS-80 III Specifications

General IconGeneral
BrandRadio Shack
ModelTRS-80 III
CategoryDesktop
LanguageEnglish

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