Product specifications

T
ROUBLESHOOTING
- 10 M
IDWAY
A
MUSEMENT
G
AMES
, LLC
Power Problems 1. Turn on Power. Use 20-volt DC setting on digital
voltmeter to measure DC voltages present at
Power connector pins. Verify +5V source if it is
adjustable. Refer to Cabinet Wiring Diagram for
specific wiring information and voltage limits.
2. Use 2-Volt AC setting on digital voltmeter to mea-
sure DC voltages at Power Connector pins. Any
reading indicates the supply voltages are unstable
and may contain ripple or noise.
• White areas at screen
edges appear tinged
with color
• Dots at screen edges
appear ovoid or cylin-
drical
Picture tube
dynamic conver-
gence is out of
alignment
Have service bureau dynamically re-converge monitor.
This procedure requires removing and repositioning
yoke. Service bureau must follow instructions from
monitor manufacturer.
• Video images tear or
roll, or have black bar
down middle of screen
Faulty wiring 1. Check connectors and cables for wiring continuity.
Video cables connect circuit boards to video moni-
tor.
2. Assure connection of all cabinet ground wires,
especially at video monitor chassis.
Faulty monitor cir-
cuitry
1. Verify video monitor operates correctly by con-
necting it to working Video Game Machine (VGM).
2. Assure video monitor is correct type for this game.
Video monitors with wrong resolution can’t lock
sync.
Improper sync
signals
1. Check to see if Video Board puts out type of sync
that your monitor requires.
2. Verify jumpers are set correctly for monitor.
Electromagnetic
fields
Move cabinet far away from machines, appliances, or
competitors’ video games.
• Missing colors Faulty wiring Check connectors and cables for wiring continuity
from circuit boards to video monitor.
Faulty monitor
color drive cir-
cuitry
Verify video monitor operates correctly by connecting
it to working Video Game Machine (VGM).
• One color is dimmer or
brighter than others
• Whites appear tinted
everywhere on screen
Maladjusted color
bias pots
1. Turn on Video Game Machine (VGM).
2. From Diagnostic Menu select MONITOR TEST.
3. Watch Color Bars screen in mirror.
4. Adjust three bias pots for best colors. (Most moni-
tor neck boards include these pots.)
5. Check White Screen. Touch up controls.
6. If whites still seem tinted, have service bureau
rejuvenate picture tube.
Symptom Cause Required Action