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7.3
MONITOR ADJUSTMENTS
a
adjustment
with instrument
_
_
,
b
CAUTION-LETHÅL
VOLTAGES ARE PRESENT
1
adjustment
without instrument
Turn
on
the terminal in
Landscape
mode
and
If
the
picture
tube
or the
electronic
have been
Seïeet
teSt
mede, (See
Seetle
7-2)
replaced, adjustment
may be
required.
2
Black*Level adjustment.
Use
a
digital volt-
Before
any
adjustment
is
performed
the
power
meter
and
measure
the voltage
at the.
tube
supply voltage
must
be
checked,
and
adjusted
if
socket board. Disconnect the cable
X21
from
necessary.
1
the
MLB.
The
Voltage
at pin
7
should
be
Any
attempt
to adjust
a
monitor
control
board
which
have
a
major
component
problem might
re-
3ä
ÅdJUSt
the
BPl9hteSS
(VR5)
te
äeeeptäbïe
sult
in
unnecessery troublesome
and
timeconsu-
level
(200
TUX
f0P
the
White
and 180 ïUX
ming
repairs,
for
the
amber DGD).
*vi
\
éïïšj
3b
adjusted
by
potentiometer
(VR6)
to
43V.
Adjust the Brightness.
Select
test
mode.
Press backtab
to
get the lowest
brightness.
Turn
(VR5) so
that
the
text is just visible
%wÉ%w%"%ÜïïÉï%%%""fïTT""'
âd_reädable.
PreSS
forward
tab
to
check
""
come
blurred
I
4
šÜëšë§§šïïääïeäïwäääï
4e
Set
the
Field
Frequency-
Di Seefineet
cab
1
e
%!ë§äšåÉ$åä%ä§É%âääÉ-
rn
X21
from the
MLB.
Connect
a
frequency coun-
ef
S
""m.>f
\_.-.>__t
ter
to
jumper
W5,
adjust
VR7
to
6OH
+/-
[
Xi*
\=\'
o
.sHz.
Z
Û
:__
~'
_-"'\\
-\
____Jy
5-_!
_
\;l
l_s-_-___,
g.
ii
Q
\
-
'/Å\_V\\_\,'X
_
|
)š\ÜÅ;
4b
Turn
the potentiometer
(VR7)
so
that
the
ai
\
=šEET=É-==
picture starts to
rolls
downwards and
then
i
i
"
t;______
turn
the potentiometer
so
that
the
picture
--==$š;;¶:\
E555;5;¿¿
moves up and
appear
to "lock" in position.
\
tt*
5,
.
.
_
Set
the Line
Frequency.
The
line
sync
input
from the
MLB
should
be
grounded
at
R5,
see
FIG 7_3
T
-
visual
aid Fig
7.3.1.
Use
a
frequency
coun-
hï
Monïor
g°"tr°]
Board
Ca" be
f°]d
ter
connected
to
R14 and
set the frequency
ou
as
S
Owe
'
by
potentiometer
VR1
to
37kHz
+/-
0.2kHz.
sn
See
fig
7.3.1.
The
line
sync should
be
grounded
as
above.
With
a
test
picture
adjust
(VR1)
until
the
7_3_1
ADjU5TMENT 1N5TRUgT10N
picture
stops or almost stops
rolling
side-
Adjustment
of
the monitor
is straight
forward
and,
after
an
initial
warm up and
check
of
the
operating
conditions,
the
following
procedure
.is
suggested:
Lelveeav
_L_,_
_
lag
We
'lf-v':.
Q
3
'I
_
Las
O
eegegeï
få
X9
I
I
>
v
få
C24
Gi
RZ7
*Ö
0
6?
is
OO
O O O
ways.
To
adjust
the
Field
frequency,
connect
this
point to
ground
Approx.
83V
FIG
7.3.1
Monitor Control
Board
test
points
\
V
v
V
.
.
v
v
V
\
0.0.0.0.0.0.0.I.øïlløloïøløloïbloltløïøhlo
01010
G\\Gm}âCEZ22}o
,,
0
_.
z
0\\
0.5.
Ü
-inälâkï
6:3
-
E'
'
I
°
1
,-
Elli:
i,
'
VR
..
.
5
T'
4
O
3
Q
C21
O
_
OI
isO
IJ
L:
sö]
O
i
<,___w¿___,,
>
Û
:
d
O
cis
O
V6
V.
-°
e
_í
cis
6
-
»
o
I
G:
ga
.
O
n
9
9
%
li
°
-
ge
.V4
. .
.
H13
Ö
«-i:i«a
É
OO
Q
4,
X3;
O|
9
37kHz
+/-
0.2kHz
:us
V33
eg
?
R7
6OHz
+/-
0.5Hz
\_"""
l
l
Ä
1
ü
Si
E
Ä
e
š
i
O
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