Midway Skins Game 25in Dedicated Upright Service Manual

							Troubleshooting - 2 Midway Games West Inc.
Machine Does Not Start
Symptom Problem Suggested Solution
•
 Machine appears
non-functional.Lack of electricity Check that power switch is on and line cord is plugged
into grounded AC outlet.
•
 Audio non-functional
•
 Fan non-functional
•
  No video displayPoor AC
connection1.  Test line cord, power plug and IEC receptacle for
breaks or damage. Verify continuity of each wire.
2.  Fully seat IEC connector into cabinet receptacle.
3.  Verify wiring harness connectors are fully seated in
the corresponding power supply receptacles.
4.  Verify AC wire connections at power supply
terminals.
Broken fuse Replace broken fuse on AC assembly with identical
type.
Faulty AC line filter 1.  Check line filter with ohmmeter to verify operation.
2.  Replace line filter if bad.
•
 Machine appears
non-functional.
•
 Fan functionalPower supply
misadjustedUsing voltage meter, correctly adjust +5V output on
power supply using adjustment knob.
•
 Machine appears
non-functional.
•
 Fluorescent light
functionalPoor DC
connection1.  Fully seat DC cable connectors in power supply.
2.  Check power supply DC fuse. Replace broken fuse
with one with identical current and voltage rating.
•
 Currency acceptor
price indicator is
illuminated.
•
  Power supply fan
functionalFaulty CPU board
assembly1.  Inspect CPU Board Assembly under low light
levels. W hen board gets DC power, its LEDs glow,
although voltages or signals may be incorrect.
2.  Turn AC power off. Ensure JAMMA connectors are
fully seated onto mating CPU Board connector.
3.  Turn AC power on. Using 20-volt DC setting on a
digital voltmeter, measure DC voltages at the hard
drive power connector pins. Adjust +5V source if
necessary. Refer to Cabinet W iring Diagram for
wiring information and voltage limits
3.  Using 2-volt AC setting on a digital voltmeter,
measure same DC voltages as above. Any reading
here indicates that supply voltages are unstable
and may contain ripple or noise.
4.  Place CPU Board Assembly in known working
machine to verify operation. Replace if faulty.
•
 Power-Up Self-Test
runs.
•
  Attract Mode does
not begin.
•
 Audio non-functionalFaulty hard disk
drive1.  Turn AC power on. Press TEST MODE button to
access Menu System. From DISK TESTS Menu,
choose DRIVE READ TEST. This indicates
whether hard disk drive mechanism is functional.
2.  Turn AC power off. Unlock and open rear door.
Inspect board assemblies. Ensure hard disk drive
ribbon cable connector is fully seated in mating
connector on CPU Board Assembly. Ensure all
drive mounting screws are installed.
3.  Ensure hard drive is correct part. Drives have a
label with assembly number and software version.
W rong component
Verify that ROM instruction set and CPU Board set are 
						

							Skins GameTroubleshooting - 3 correct. Components are marked with manufacturer
name, assembly number and hardware version.
W rong voltage
1.  Turn AC power on. Using 20-volt DC setting on a
digital voltmeter, measure DC voltages present at
power connector pins. Verify +5V source if it is
adjustable. Refer to cabinet W iring Diagram.
2.  Using the 2-volt AC setting on a digital voltmeter,
measure the same DC voltages as above. Any
reading indicates that the supply voltages are
unstable and may contain ripple or noise.
DIP switches set
wrongCheck DIP switch setting.
CAUTION: 
Do not operate monitor without Remote Adjustment Board.
Video Problems
Symptom Problem Suggested Solution
•
 Monitor appears
non-functional.
•
 Audio functional
•
 Controls functionalLack of electricity to
monitor1.  Unlock and remove rear door. Verify AC power is
connected to video monitor. Inspect neck of CRT
under low light level conditions. A glow near the
CRT base indicates voltage in the filament circuits,
not that other voltages or signals are proper.
2.  Turn AC power off. Verify that video signal and
Remote Adjustment Board connectors fully seat on
the Video Monitor Board. Check other monitor
connectors in the same way.
3.  Examine AC line fuse on Video Monitor Board.
Replace faulty fuse with one of identical voltage
and current rating.
4.  Ensure no loose parts or wires are caught on
chassis or mounting brackets.
5.  Verify monitor works by placing in known working
game. Replace faulty monitor with identical type.
•
  Monitor does not
lock onto signal or
provide stable
picture.
•
  Picture wavers orPoor connection
1.  Check connectors and cables for wiring continuity
from CPU Board Assembly to the Video Monitor.
2.  Ensure all cabinet ground wires are connected,
especially at the Video Monitor Chassis.
rolls, has dark bars,
uneven or missing
colors, etcW rong monitor
Verify this is the correct monitor. Using monitors with
different resolution results in what appears to be
horizontal tearing or complete loss of sync.
Magnetic
interferenceMove cabinet away from equipment, appliances, other
Video Game Machines, etc. Some normally operating
devices emit very strong electrical or magnetic fields.
Faulty monitor
Verify monitor works by placing in known working
game. Replace faulty monitor with identical type. 
						

							Troubleshooting - 4 Midway Games West Inc.
Audio Problems
Symptom Problem Suggested Solution
•
 Video functional
•
 Game functional
•
 Audio non-functionalPoor connection
1.  Press TEST MODE pushbutton to enter Menu
System. Choose ADJUST VOLUME. Ensure Attract
Mode and game volume levels are not at zero.
Adjust levels if necessary to produce sound.
2.  Inspect wiring harnesses and verify connections as
indicated by the Cabinet W iring Diagram.
3.  Using 20-volt DC setting on a digital voltmeter,
measure DC voltages present at power connector
pins. Verify +5V, -5V and +12V sources. Refer to
Cabinet W iring Diagram.
4.  Using 2-volt AC setting on a digital voltmeter,
measure same DC voltages as above. Any reading
here indicates that the supply voltages are unstable
and may contain ripple or noise.
Bad IC
Place CPU Board in known good machine. Repair or
replace if audio is non-functional.
•
 Audio distorted,
muffled, missing
frequencies
•
  Low hum presentFaulty speakers
1.  Press TEST MODE to enter Menu System.
2.  From the Self-Test Menu, choose SOUND TESTS
to verify some audio circuit functions.
3.  Turn AC power OFF. Remove grill and that each
speaker is full range (100 Hz to 10 KHz response)
and rated for at least 10 watts.
Bad wiring
1.  Turn AC power off. Remove grille. Ensure no loose
parts are caught in speaker cones, terminals,
mounting screws, or stuck to magnets.
2.  Ensure wiring is not reversed on a speaker. W eak,
low frequencies and thin or hollow sound quality
suggests incorrectly phased speakers.
3.  Verify wiring against Cabinet W iring Diagram.
Ensure there is a separate wire (not a common
return) for each speaker. Ensure cabinet ground
wires are connected.
4.  Using 2-volt AC setting on a digital voltmeter,
measure voltages at the speaker terminals. Any
reading here indicates that supply voltages are
unstable and may contain ripple or noise.
5.  Place speaker in working game to verify operation.
•
 Audio monauralPoor connection
Verify wiring against Cabinet W iring Diagram. Check
for shorted wires. 
						

							Skins GameTroubleshooting - 5
Controls Problems
Symptom Problem Suggested Solution
Joystick is out of
calibrationFrom Self-Test Menu, choose CONTROLS TEST.
Follow screen instructions to recalibrate joystick.
Faulty wiring
1.  Ensure wiring connectors are firmly seated in
control panel and no wires are broken or pinched.
2.  Repair or replace damaged cables. Reposition
wires as necessary to avoid cinching.
Poorly seated
potentiometer1.  Inspect joystick assembly. A potentiometer may not
be seated snugly.
2.  Remove a spring clip to reveal potentiometer.
3.  Try rotating potentiometer. If snug, it will not turn. If
it turns, push it inward while turning until you
correctly realign it and it seats tightly.
4.  Replace clip and inspect other potentiometer.
Bad potentiometer
5.  Turn AC power on. Check voltage at each
potentiometer. Put voltmeter leads on center tap
and ground. Leave joystick in default position.
Meter should read about +1.5V.
6.  Use analog or bar graph digital voltmeter for this
test: Put voltmeter leads on wiper and ground.
Move joystick through its range. Check for smooth,
linear transition between .5V and 1.5V. If meter
jumps at any point, potentiometer is bad.
7.  Replace a potentiometer that fails either test.
Bad inline power
fuse1.  Check voltages to CPU Board Assembly.
2.  If +5VDC is absent, replace inline fuse on power
cable. Use identical type fuse and retest voltages.
•
 Joystick non-
functional or
functions erratically
Faulty Pot Amp
chip1.  Test CPU Board Assembly in working machine.
2.  If joystick is still bad, repair or replace.
•
 Joystick slips,
seems loose. Poor
response.Nylon spacer worn
by rotating bracket1.  Remove joystick assembly, turn upside down, and
check whether there is too much play in brackets
when stick moves.
2.  Invert nylon spacer 180 degrees and replace.
3.  If already inverted, replace with new spacer.
Loose
potentiometer
captivating bracketEnsure pot captivating bracket is flush to flat of pot
shaft and retaining screw is secure.
•
 Joystick non-
functionalFaulty fuse
Replace broken fuse with identical type.
•
 Button non-
functional or
functions erraticallyPoor connection
Check connection and tighten.
Faulty button
1.  Place button in known working machine.
2.  Replace faulty button with identical type. 
						

							Troubleshooting - 6 Midway Games West Inc.•
  Startup button bulb
non-functionalFaulty bulb
1.  Remove bulb and inspect filament.
2.  Replace faulty bulb with identical type.
3.  Check +12 fuse to lamp.
•
 Keypad non-
functional or
functions erraticallyPoor connection
1.  Check that connections are tight.
2.  Compare to W iring Diagram to ensure accurate
connections.
Faulty keypad
1.  Place keypad in known good machine.
2.  Replace faulty keypad with identical type.
Coin Mechanism Problems
Symptom Problem Suggested Solution
Improper software
settings1.  Press TEST MODE pushbutton.
2.  Access CONTROLS TEST. Confirm operation of
each coin or bill mechanism.
3.  Access COIN OPTIONS. Verify each mechanism’s
pricing and setup options are set correctly.•
  Currency or tokens
are accepted
•
  Number of credits
per coin or bill is
incorrect.
Faulty wiring
1.  Check that cabinet wiring is correct.
2.  Check that coin meter and coin switches connect
properly to control input wires from JAMMA
connector and CPU Board wiring.
3.  Ensure coin meter and coin switches connect
properly to control input wires.
Improper settings at
Menu System1.  Press TEST MODE pushbutton.
2.  Access COIN OPTIONS. Confirm pricing and setup
of each mechanism.
Faulty wiring
1.  Ensure no loose parts or wires are caught in
hinges, latches, or switch contacts.
2.  Check that external coin door indicators (pricing,
flashing arrows, etc.) are illuminated.
3.  Check connectors and cables for wiring continuity
from CPU Board Assembly to coin mechanisms.
4.  Replace faulty wiring with identical type.
•
  Currency or tokens
are accepted.
•
 Startup fails.
•
  Audio and video
functional
Faulty coin
mechanism1.  Check mounting of each mechanism.
2.  Close and lock release latches.
3.  Test good and bad coins to see if mechanism
accepts and rejects correctly.
4.  Check continuity in switch connections (common to
normally open or common to normally closed).
Replace switches with bent levers, broken
actuators, etc.
5.  Place each coin mechanism in working game to
verify operation.
6.  Replace faulty coin mechanisms with identical type. 
						

							Skins GameTroubleshooting - 7 Bad currency
1.  Inspect cash box for counterfeit currency.
2.  Remove any items that block path from mechanism
to cash vault.
Faulty coin
mechanism1. Unlock and open coin door. Check each
mechanism for proper mounting.
2. Remove mechanism.
3.  Clear currency path.
4.  Reinstall mechanism and latch it.
•
  Currency or tokens
are not accepted
•
  Game does not
start.
•
  Audio and video
functional
Tilted coin
mechanism or
game1.  Verify that mechanism is level after doors close.
2.  Repair or replace coin door if bent or damaged.
3.  If necessary, adjust cabinet leg levelers to keep
mechanisms vertical.
Burned-out bulb
1.  Burned-out bulbs may appear white or darkened.
Check continuity with DVM.
2.  Replace burned-out bulb with same type.•
  Coin indicators do
not light
Faulty fuse
1.  Check fuse continuity with DVM.
2.  Replace blown fuse with identical type
3.  If fuse is not blown, check wiring.
Bill Validator Problems
Symptom Problem Suggested Solution
Improper software
settings1.  Press TEST MODE to enter Menu System. Choose
COIN OPTIONS. Confirm pricing and setup.
2.  If necessary, adjust pricing and setup.
3. Check validator switch settings against
manufacturer’s instruction sheet.
Faulty wiring
1.  Check if external coin door indicators (pricing,
flashing arrows, etc.) are illuminated.
2.  Ensure no loose parts or wires are caught in
hinges, latches, or switch contacts.
3.  Verify that harness connectors are attached and
fully seated.
4.  Check for validator cable continuity.
5.  Replace faulty wiring with identical type.
•
  Bill validator does
not function after
field installation.
•
 Coin mechanisms
functional
Faulty bill validator
1.  Verify that bill validator operates properly by placing
it in working game.
2.  Replace faulty validator. 
						

							Troubleshooting - 8 Midway Games West Inc.
Marquee Lamp Problems
•
  Marquee lamp is
non-functional or
functions
intermittentlyBulb seated poorly
Verify fluorescent bulb pins make good connection with
socket contacts.
•
  Startup is normal.
•
  Game play is
normal.Faulty bulb
1.  Remove fluorescent bulb from sockets.
2.  If you find cracks or darkened ends, replace.
3.  Check continuity of both bulb filaments.
4.  Verify bulb operates by placing in known working
game. Clean bulb.
5.  Replace faulty bulb with identical type.
Faulty wiring
1.  Measure fluorescent bulb AC voltages. Check
wiring and connector continuity from AC power
chassis to lamp assembly.
2.  Replace faulty wiring with identical type
Other faulty lamp
parts1.  Ensure ballast is rated for local AC line voltage and
frequency.
2.  Check continuity of starter and ballast.
3.  Place starter and/or ballast in working game to
verify operation.
4.  Examine DC fuse on electronics shelf.
5.  Replace faulty parts with identical ones.
Miscellaneous Problems
•
 Game functional
•
 Cabinet becomes
warm after several
hours of use.Poor air flow.
1.  Check air flow at bottom and rear of cabinet.
2. Clear obstructions.
3.  Move cabinet away from sources of heat.
4.  Turn AC power off. Remove dust from vent holes
with high-power vacuum cleaner.
5.  Check operation of all fans. Replace if faulty.
•
 Error messages
appear on screen.Faulty hardware
Check assembly cited in message. Call authorized
distributor for help with unresolved screen messages.
•
 Modem non-
functionalBad connection
Check that modem is well seated in PCI slot.
Cable disconnected
Ensure cable is well seated in jack and modem.
Bad phone line
1.  Plug cable into another wall jack.
2.  Test jack with fax machine or telephone.
Server down
Reattempt connection tomorrow.
Bad modem card
Replace faulty card with identical type
•
  Clock is wrongSoftware set wrong Use Set Date/Time in Menu System to reset clock.
Drained battery
Replace lithium battery with identical type. 
						

							NOTICE
The “libc”  and “libm” libraries (the “Libraries”) are used with the “banner,” “bootbr,” “run_game,”  “swts,” “host_hddnl,”
“targ_hddnl” and “os.elf” applications (the “Applications”).  The Libraries and their use are licensed without charge
and are covered by the GNU Library General Public License.  See the source and related files for the Libraries,
which are found on the hard drive in /usr/src.  Each Application, as linked with one or both of the Libraries (as the
case may be), is referred to as a “W ork.”
The owner of this coin-operated video game is permitted to modify the W orks for his/her own use and to reverse
engineer the W orks in order to debug these modifications, provided that this permission applies only to the extent
necessary to comply with the GNU Library General Public License.  This permission does not include, and the owner
does not have, any right whatsoever to distribute, transmit or otherwise disseminate the Applications or any copies
thereof to any third party whatsoever.  However, ANY SUCH MODIFICATION VOIDS ALL W ARRANTIES, EXPRESS
OR IMPLIED, RELATING TO THIS COIN-OPERATED VIDEO GAME AND ANY OTHER COIN-OPERATED VIDEO
GAME INTO W HICH ANY MODIFICATION IS INSTALLED AND VOIDS ANY PARTICIPATION IN ANY
TOURNAMENT THROUGH THIS COIN-OPERATED VIDEO GAME AND ANY OTHER COIN-OPERATED VIDEO
GAME INTO W HICH ANY MODIFICATION IS INSTALLED. 
						

							WARNINGS & NOTICES
Entire contents of this manual copyright © 2000 Midway Games West Inc. All rights reserved.
WARNING
Use of non-Midway Games W est Inc. parts or circuit modifications may cause serious injury or equipment damage.
Use only Midway authorized parts.
•
  Use only authorized components and parts. Failure to do so will void warranty and may result in incorrect and/or
unsafe operation. Substitute parts or modifications may void EMC directive or FCC type acceptance.
•
  This game is protected by federal copyright, trademark and patent laws. Unauthorized modifications may be
illegal under federal law. This also applies to Midway Games W est Inc. and Skins Game logos, designs,
publications and assemblies. Moreover, facsimiles of Midway Games W est Inc. equipment (or any feature
thereof) may be illegal under federal law, regardless of whether or not such facsimiles are manufactured with
Midway Games W est Inc. components.
WARNING
Prevent shock hazard and assure proper game operation. Plug this game only into a properly grounded outlet. Do
not use a cheater plug to defeat the power cords grounding pin. Do not cut off the ground pin.
WARNING
A very small portion of the population has a condition which may cause them to experience epileptic seizures or
have momentary loss of consciousness when viewing certain kinds of flashing lights or patterns that are present in
our daily environment. These persons may experience seizures while watching some kinds of television pictures or
playing certain video games. People who have not had any previous seizures may nonetheless have an undetected
epileptic condition.
If you or anyone in your family has experienced symptoms linked to an epileptic condition (e.g. seizures or loss of
awareness), immediately consult your physician before using any video games.
W e recommend that parents observe their children while they play video games. If you or your child experience the
following symptoms: dizziness, altered vision, eye or muscle twitching, involuntary movements, loss of awareness,
disorientation, or convulsions, discontinue use immediately
 and consult your physician.
NOTICE
This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to Part 15
of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference when the
equipment is operated in a commercial environment. This equipment generated, uses and can radiate radio
frequency energy and if not installed and used in accordance with the instruction manual, may cause harmful
interference to radio communications. Operation of this equipment in a residential area is likely to cause harmful
interference in which case the user will be required to correct the interference at his own expense.
FCC COMPLIANCE LABEL
W hen Midway ships a game, it is in compliance with FCC regulations. The FCC label on your cabinet is proof. If this
label is missing or damaged, legal repercussions to the owner or distributor of the game may result. If your game
does not have an FCC label, contact Midway immediately.
NOTICE
No part of this publication may be reproduced by any mechanical, photographic, or electronic process, or in the form
of a phonographic recording, nor may be transmitted, or otherwise copied for public or private use, without
permission from the publisher.
For Service: Call your authorized Midway Games W est Inc. distributor.
MIDWAY GAMES WEST INC.
675 SYCAMORE DRIVE
MILPITAS, CALIFORNIA 95035
UNITED STATES OF AMERICA