Instruction manual
IMPORTANT
instructions for use
of
patterns
in
monitors
is
presented; however,
afe interacting and
the
manufacturers
have prescribed an
which these
Four
adapters
which
mate
most
of
the
monitors
currently
supplied by
Electrohome
and Wells
Gardner
provided with
the
Model 241 Before
connecting
to
the
monitor,
the
manufacturer's
input
should be
the
adapter
wiring detailed
in
the
ADAPTE R section of this
It
none
of
the
match
both
connector
type
and pin-out
of
then
the
operator
must
make
an Several
extra
connectors
been
provided for this
purpose.
If
additional
connectors
are needed,
the
FIELD
REPLACEABLE PARTS LIST
in
the
rear
of
this manual
In
some
cases
power
for
the
monitor
is
supplied
through
the
same con-
the
signals.
The
Model 241
does
not
supply
power
to
the
monitor.
where
power
and signals are
on
the same
connector
a
"Y"
adapter
is
which plugs into the
monitor
input,
the
241
output
and
the
game
output.
The
power
made
through
the
connectors
from game
Model
241 are
"inserted"
into
the
There several steps and precautions which should be
taken
when work-
any
Arcade game.
They
IMPORTANT
Be
sure
the
Model 241 PWR and
the
monitor
powers are
turned
OFF
before
to
or
from
the
monitor.
WARNING
2. Many
monitors
have circuit
The
Model 241
is
connected
to
one
side
of
the
power
insulated
but
the
monitor
itself can
provide shock hazard. When servicing such a
monitor
an isolating
transformer
should
be
used.
3.
Be
both
the
connector
ana
the
pin·out
of
the
Model 241
adapter
matches
the
monitor
you
are servicing. I f
there
is
any
difficulty
plug·
ging
in
the
check
the
connector
match
and for
bent
pins
in
either
the
monitor
or
instrument
connector.
4.
If
at
first
patterns
can
be
check
PWR
mode
and SCAN
MODE
buttons
on
the
Model 241 for
proper
selection.
Then
check
the
R,G,B
buttons
to
be sure are activated. Recheck
the
adapter
con-
nections
in
the
ADAPTER section).
-14-
SECTION IV
RASTER SCAN MONITOR SERVICING
GENERAL
IMPORTANT
Be
sure
the
GENERATOR
OPERATION section
of
this manual has been reviewed.
The Model
241 RASTER Scan
outputs
provide separatE!
horizontal
and
vertical sync signals
a
to
+5 volts (TTL
compatible).
Both plus , H
and negative going
(V,
are provided
The
R
,G
and B
signals are separate
a
to
+4 volts (TTL
compatible)
which be
turned
on
or
off
the
front
panel R,G, B
pushbutton,.
The
tude
can
be from a
to
+4 volts
to
control
the
using
the
front
panel BRIGHTNESS
control
For black and
white
monitors
only
one
gun signal
is
required
but
which
(R
or
B)
on
the
monitor
connections.
It
is
best
to
activate all GUN
CONTROL
RASTER SCAN
SETUP
1. Follow
the
instructions
in
the
GENERATOR
OPERATION
the
OPERATING INSTRUCTIONS section
of
this manual
tor
to
service a raster scan
monitor.
of
2.
Set
the
SCAN MODE
pushbutton
to
RASTER and
turn
the
BRIGHT-
NESS
control
to
minimum.
3.
Activate all
of
the
GUN CONTROL switches.
4.
Select
the
G (Bold Crosshatch
pattern.
5. Set PWR
to
ON.
6.
Turn
up
the
BRIGHTNESS
control
until
the
pattern
appears
at
nor.
mal brightness. Do
not
set
the
too
h
it
defocusing
of
the
CRT.
ADJUSTMENTS SPECIFIC TO RASTER SCAN MONITORS
Adjustment
procedures for
monitors
will vary from
monitor
to
often
even
with
monitors
from
the
same
manufacturer.
It
is
advisable
to
use
the
manufacturer's
Service Instructions
when
n"'F+"F~
to
monitors. Presented here
is
a
-15-