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Video Troubleshooting Table, confinued
SYMPTOM
White areas at screen edges
appear tinged with color
.
Dots at screen edges
appear
ovoid
or
.
Video tears or rolls, or has
black bar down middle of
screen
Missing colors
One color is dimmer or
brfghter
than
others
,
Whites appear tinted
everywhere on screen
Picture is dim or faded
Picture is too narrow
,
Picture is too short
Picture seems shifted to one
side
Keystone-shaped
CAUSE
Picture tube dynamic
convergence is out of
alignment
cylindrical
Faulty wiring
Faulty monitor
circuitry
Improper sync signals
Electromagnetic
fields
Faulty
wiring
Faulty
monitor
Maladjusted color
bias pots
Maladjusted
BRIGHTNESS pot or
subnormal picture
tube emission
Maladjusted W tDTH
Maladjusted HEtGHT
pot or-damaged
vertical
circuit
Maladjusted
Shorted turns in yoke
picture
REQUIRED ACTION
Have service bureau dynamically reconverge
monitor. This procedure requires removing and
repositioning yoke. Service bureau must follow
instructions
1.
Check connectors and cables for wiring
continuity.
to circuit boards, and then to video monitor.
2.
Assure connection of all cabinet ground wires,
especially
1.
Verify that video monitor operates correctly by
connecting it to working VGM.
2.
Assure that video monitor is correct type for this
VGM. Video monitors with wrong resolution can't
lock sync.
Check to see if Video Board puts out type of
1.
sync that your monitor requires.
2.
Verify that jumpers are set correctly for monitor.
3.
at Sound f/O Board jumper block JIO. With no
pins connected (or pins 2 and 3 connected),
board outputs positive sync. With pins 1 . and 2
connected,
Move cabinet far away from machines,
appliances, or competitors' VGMs.
Check connectors and cables for wiring
continuity from circuit boards to video monitor.
Verify that video monitor operates correctly by
color
connecting it to working VGM.
1.
Turn on VGM.
2.
Enter Monitor Tests Menu.
3.
Watch Color Bars screen in mirror.
4. Adjust three bias pots for best colors. (Most
monitor neck boards include these pots.)
5.
Also check White Screen. Touch up controls.
6.
If whites still seem tinted, have service bureau
rejuvenate picture tube.
1.
Watch Color Bars screen. Adjust BRIGHTNESS
and CONTRAST pots for greatest number of
grays. You'll find these pots on Monitor Remote
Control Board, behind coin door.
2. If pots have no effect, have service bureau
rejuvenate
Enter Monitor Tests Menu. Watch Crosshatch
Screen while adjusting WIDTH pot for best
You'll find this pot on Monitor Remote
Control Board, behind cdin
1. Enter Monitor Tests Menu. Watch Crosshatch
Screen while adjusting HEIGHT pot for best
picture. You'll find this pot on Monitor Remote
Control Board, behind coin door.
2.
Enter Monitor Tests Menu. Watch Crosshatch
Screen while adjusting HORtZONTAL POStTlON
pot for best picture. You'll find this pot on Monitor
Remote Control Board, behind coin door.
1.
Substitute working yoke.
2.
Have
service
3. Retest monitor.
7-12
from
monitor
manufacturer.
Video
cables
connect
graphics
at
video
monitor
chassis.
board
outputs
negative
picture
tube.
door.
bureau
converge
monitor.
card
sync.
1 2
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