
T
est
P
atterns
T
est
patterns
are
used
in
the
factory
for
display
adjustmen
ts,
diagnostics,
and
troublesho
oting,
but
they
are
not
used
for
eld
service.
T
est
patterns
are
executed
b
y
en
tering
the
test
n
um
b er
(66
through
80),
then
pressing
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
EXECUTE
TEST
NNNNNNNNNNNNNNNNNNNNNNNNNN
CONTINUE
.
The
test
pattern
will
b e
display
ed
and
the
softkey
lab
els
blank
ed.
T
o
exit
the
test
pattern
and
return
the
softkey
lab
els,
press
softkey
8
(b ottom
softkey).
The
following
is
a
description
of
the
test
patterns.
66
T
est
pat
1.
Displa
ys
an
all
white
screen
for
v
erifying
the
light
output
of
the
A18
display
and
c
hec
ks
for
color
purity
.
In
this,
and
other
solid
test
patterns,
an
extremely
thin
full-screen
horizontal
line
will
b e
seen
ab out
1/4
screen
heigh
t
from
the
b ottom.
This
condition
is
c
haracteristic
of
the
display
and
do es
not
indicate
an
y
problem.
67-69
T
est
P
at
2-4.
Displays
a
red,
green,
and
blue
pattern
for
v
erifying
the
color
purity
of
the
display
and
also
the
abilit y
to
indep enden
tly
con
trol
eac
h
gun
color.
If
the
purity
of
the
display
ed
test
pattern
is
a
problem,
it
usually
indicates
that
the
face
of
the
display
needs
to
b e
de-gaussed
(de-magnetized).
If
purity
is
bad,
cycling
the
p o
w
er
a
few
times
may
cure
the
problem.
If
this
do es
not
w
ork,
a
commercially
a
v
ailable
de-magnetizer
m
ust
b e
used.
70
T
est
P
at
5.
Displays
a
16-step
gray
scale
for
v
erifying
that
the
palette
c
hip
on
the
A19
GSP
b oard
can
pro duce
16
dieren
t
amplitudes
of
color
(in
this
case,
white).
This
pattern
is
also
v
ery
useful
when
using
an
oscilloscop
e
for
troublesho
oting.
The
staircase
pattern
it
pro duces
will
quic
kly
sho
w
missing
or
stuc
k
data
bits.
71
T
est
P
at
6.
Displa
ys
a
3-step
gray
scale
pattern
for
adjusting
the
bac
kground
lev
el
(or
0
step)
so
that
the
rst
bar
is
not
visible,
and
the
second
bar
is
just
barely
visible.
This
pattern
consists
of
the
rst
three
gray
scale
bars
ofthe
16-step
gray
scale.
72
T
est
P
at
7.
Displa
ys
a
con
v
ergence
pattern
for
measuring
the
accuracy
of
the
color
con
v
ergence.
It
is
mainly
for
use
b
y
the
factory
,
since
con
v
ergence
cannot
b e
adjusted
in
the
eld.
73-74
T
est
P
at
8-9.
Displays
crosshatch
and
in
v
erse
crosshatch
patterns
for
testing
color
con
v
ergence,
linearity
,
alignment,
and
high
v
oltage
regulation,
in
the
factory
only
.
No
eld
adjustmen
ts
are
p ossible.
75
T
est
P
at
10.
Displays
an
H
pattern
for
c
hec
king
the
fo
cus
ofthe
display
.
Under
normal
conditions,
this
should
nev
er
need
to
b e
adjusted.
Ho
w
ev
er,
it
is
p ossible
to
adjust
it
b
y
accessing
the
fo
cus
con
trol
adjustmen
t
at
the
left
rear
of
the
display
.
See
the
\Adjustmen
ts"
c
hapter.
76
T
est
P
at
11.
V
eries
the
functionalit
y
ofthe
pixel
stretching
circuit
ofthe
A19
GSP
b oard.
Under
normal
conditions,
this
pattern
should
app ear
all
white.
Ifa
failure
o ccurs
in
the
pixel
stretching
circuit,
the
pattern
will
consist
of16
alternating
white
and
gray
v
ertical
strip
es.
Susp ect
problems
with
the
STRETCH
line
and
LFIRSTPIX.
77
T
est
P
at
12.
Displays
a
rep eating
gray
scale
for
troublesho
oting,
using
an
oscilloscop
e.
It
is
similar
to
the
16
step
gray
scale
but
is
rep eated
32
times
across
the
screen.
Eac
h
ofthe
3
outputs
ofthe
video
palette
will
then
sho
w
32
ramps
(instead
ofone
staircase)
b et
w
een
eac
h
horizontal
sync
pulse.
This
pattern
is
used
to
troublesho
ot
the
pixel
pro cessing
circuit
ofthe
A19
GSP
b oard.
DRAFT
3/21/106
15:14
Service
Key
Menus
and
Error
Messages
10-11
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