Midway Arctic Thunder, Manual

Page: 74 / 76

Symptom
l
Video images tear or
roll, or have black bar
down middle of screen
l
Missing colors Faulty
l
One color is dimmer or
brighter than others
. Whites appear tinted
everywhere on screen
l
Picture is too narrow
l
Picture is too short
l
Picture seems shifted
to one side
l
Keystone-shaped pic-
ture
Cause
Faulty wiring
Faulty monitor cir-
cuitry
Improper sync
signals
Electromagnetic
fields
Faulty monitor
color drive cir-
cuitry
Maladjusted color
bias pots
Maladjusted WIDTH
pot.
Maladjusted
HEIGHT pot or
damaged vertical
circuit
Maladjusted
HORIZONTAL
POSITION pot
Shorted turns in
y o k e
Required Action
Check connectors and cables between
boards and monitor for wiring continuity.
2. Assure connection of all
at video
Verify video monitor operates correctly by
it to game
2. Assure video monitor is correct type forth
Video monitors with wrong
s y n c .
Make sure Video Board proper type :
2 .
Verify jumpers are set correctly for
1.
Move game cabinet further away from
appliances, or other video games.
1.
Check connectors and cables for wiring
from circuit boards to video monitor.
Verify video monitor operates correctly by
it to a working game machine.
Access Diagnostic Menu. then select
TEST. Perform the COLOR BARS TEST
l
Adjust three bias pots for best colors.
monitor neck boards include these pots.;
2.
Check White Screen. Touch up controls.
l
If whites still seem tinted, have service
rejuvenate picture tube.
Access Diagnostic Menu, then select
TEST. Perform CROSSHATCH TEST.
2. Adjust screen width using the pot on
Remote Control Board. located benind
Access Menu, then select
TEST. Perform CROSSHATCH TEST.
l
Adjust screen height tne height po!
Monitor Remote Control Board behind
l
If pot has no effect, service
1.
Access Diagnostic Test, then select
TEST. Perform CROSSHATCH TEST.
l
Adjust Horizontal pot for best pi:
using the Monitor Remote Control Board be
coin door.
Substitute working yoke.
2.
Have service bureau converge monitor.
3. Retest monitor.
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