Specifications
Symptom
l Video images tear or
roll, or have black bar
down middle of screen
l Missing colors Faulty wiring
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
yoke
Required Action
1.
Check connectors and cables between
c:rc
boards and monitor for wiring continuity.
2. Assure connection of all cabrnet grounc
especrally at video monrtor
chassrs.
1.
Verify video monitor operates correctly by
:
nectrng it to workrng game macnrne
2. Assure video monitor is correct type forth
L
Video monitors with wrong resolu:ron
c;;-
sync.
I. Make sure Video Board
emrts
proper type :
2.
Verify jumpers are set correctly for monito-
1.
Move game cabinet further away from mac-
appliances, or other video games.
1.
Check connectors and cables for wiring
co
from circuit boards to video monitor.
I. Verify video monitor operates correctly by :
_
netting it to a working game machine.
1.
Access Diagnostic Menu. then select MONr‘
TEST. Perform the COLOR BARS TEST
l Adjust three bias pots for best colors.
if.?
monitor neck boards include these pots.;
2.
Check White Screen. Touch up controls.
l If whites still seem tinted, have service
t:
rejuvenate picture tube.
I. Access Diagnostic Menu, then select MOl\i:-
TEST. Perform CROSSHATCH TEST.
2.
Adjust screen width using the
w&h
pot on
r
Remote Control Board. located benind corr
1.
Access Dragnostic Menu, then select MON
TEST. Perform CROSSHATCH TEST.
l Adjust screen height
usrng
tne height po!
Monitor Remote Control Board behind coir
l If pot has no effect, service verrcal outpL-
cuit.
1.
Access Diagnostic Test, then select
MONIT-Y
TEST. Perform CROSSHATCH TEST.
l Adjust Horizontal
Posrtron
pot for best pi:
using the Monitor Remote Control Board be
coin door.
1.
Substitute working yoke.
2.
Have service bureau converge monitor.
3. Retest monitor.
TROUBLESHOOTING
-
10
MIDWAY AMUSEMENT
GA+:
I