Atari ASTEROIDS Manual

TM-143
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Operation, Maintenance
and Service Manual
Complete with Illustrated Parts Lists

GAME SERIAL NUMBER LOCATION
Your game’s serial number is located on the outside rear of the game. The
same number is also stamped on the chassis of the TV monitor Game PCB
and Regulator/Audio PCB. Please mention this number whenever calling your
distributor for service.

Operation, Maintenance
and Service Manual
Complete with Illustrated Parts Lists
Published by:
ATARI INC
1 65 Borregas Avenue
P. O. Box 4 7
Sunnyvale, California 94086
Cop right © 1979 b Atari, Inc. All rights reserved
No part of this publication may be reproduced by any mechanical,
photographic, or electronic process, or in the form of a phonographic re
cording, nor may it be stored in a retrieval system, transmitted, or other
wise copied for public or private use, without permission from the publisher. A
ATARI
Lithographed in the U.S.A. 1J A Warner Communications Company

Table of Contents
Asteroids
1 Location Setup
A. New Parts................................................................................................... 1
B. Game Inspection....................................................................................... 3
C. Game Installation....................................................................................... 3
1. Voltage Selection............................................................................... .. 3
2. Interlock and Power On/Off Switches .............................................. .. 3
3. Game Fuses....................................................................................... .. 5
D. Self-Test Procedure................................................................................... .. 5
E. Game P lay................................................................................................. .. 8
1. Attract Mode....................................................................................... .. 8
2. Ready-to-Play M ode........................................................................... .. 8
3. Play Mode........................................................................................... .. 8
4. High Score Initial M ode..................................................................... .. 9
2 Maintenance and Repair
A. Cleaning................................................................................................... 12
B. Fuse Replacement.....................................................................................12
C. Opening the Control Panel .......................................................................12
1. Leaf Switch Replacement...................................................................12
2. LED Switch Replacement...................................................................12
D. TV Monitor Replacement...........................................................................14
E. Printed Circuit Board Replacement ........................................................ 15
F. Fluorescent Tube Replacement .............................................................. 16
G. Game Operation.........................................................................................16
3 Illustrated Parts Lists
ii

List of Illustrations
Asteroids
Figure 1 Overview of Game.................................................................................. 2
Figure 2 Installation Requirements...................................................................... 3
Figure 3 Power Supply.......................................................................................... 4
Figure 4 Interlock and Power On/Off Switches.................................................... 4
Figure 5 Location of Self-Test Switch Volume Control and Option Switches . 5
Figure 6 Self-Test Procedure................................................................................ 6
Figure 7 Option Switch Settings.......................................................................... 7
Figure 8 Opening the Control Panel ....................................................................13
Figure 9 TV Monitor Removal................................................................................14
Figure 10 Game and Regulator/Audio PCB Replacement ................................... 15
Figure 11 Fluorescent Tube Replacement............................................................16
Figure 12 Power Distribution..................................................................................17
Figure 13 Signal Distribution..................................................................................18
Illustrated Parts Lists:
Figure 14 Final Assembly........................................................................................20
Figure 15 Control Panel Assembly........................................................................22
Figure 16 Asteroids Game PCB Assembly ........................................................... 24
Figure 17 Regulator/Audio PCB Assembly............................................................28
Figure 18 Power Supply Assembly for X-Y Games................................................30
Figure 19 Main Harness and Component Assembly. . ..........................................32
Figure 20 Fluorescent Light Assembly..................................................................33
Figure 21 Coin Door Assembly..............................................................................34
Figure 22 Front Bezel Assembly............................................................................36
Figure 23 New Coin Door........................................................................................38
iii

Asteroids
----------------------------------------NOTE----------------------------------
If reading through this manual does not lead to solving a certain
maintenance problem, call Tele-Help™ at the Atari Customer Service office
in our geographical area, as shown in one of the two maps below. Order
all parts from the California office.
WEST and CENTRAL U.S.A.
Parts for all Atari Customers. Sales and Service.
Atari Coin-Ορ Customer Service
1344 Bordeaux Drive, Sunnyvale, CA 4086
Telex 17-1103
(Monday - Friday, 7:30 - 4:00 pm Pacific Time)
From California, Alaska or Hawaii
** (408) 745-2 00
From anywhere else in this area
** toll-free [phone]
EAST U.S.A.
Sales and Service Only
Atari Inc.
New Jersey Customer Service Office
Cottontail Lane, Somerset, NJ 08873
Telex 37- 347
(Monday - Friday, 8:30 - 5:00 pm Eastern time)
From New Jersey
** (201) 46 -5 3
From anywhere else in this area
** toll-free (800) 526-384

A. New Parts
The Asteroids game has three new parts. If you
have worked on Atari games in the past then you
should be aware of these important differences. The
new parts are:
• Power Supply Assembly. It covers a wider
voltage range than before has higher reliability
a smaller overall size and all fuse numbers and
fuse amperages are marked directly on the metal
chassis.
• Game PCB Circuitry and TV Monitor. Most video
games to date have used the raster scan method
of display. This game uses vector generation
with X and Y axes to allow greater contrast a
greater number of moving objects on the screen
and lines at any angle to be “drawn” on the
screen.
Throughout this manual wherever one of these
three new parts is mentioned you will see this sym
bol in the page margin:

Asteroids
Figure 1 Overview of Game
2

B. Game Inspection C. Game Installation
Asteroids
This new game is ready to play upon removal from
the shipping carton. However your careful inspec
tion is needed to supply the final touch of quality
control. Please follow these steps to help us insure
that your new game was delivered to you in good
condition.
NOTE
Do not plug the game in yet!
Figure 2 Installation Requirements
Power
Temperature
Humidity
Space Required
Game Height
175 watts
Oto 38° C (32 to 100°F)
Not over 95% relative
65 x 79 cm (251/2 x 31 in.)
184 cm (721/2 in.)
1. Examine the exterior of the game cabinet for
dents chips or broken parts.
2. Unlock and open the access panel of the
cabinet and inspect the interior of the game as
follows:
a. Check that all plug-in connectors (on the
game harness) are firmly seated. Replug
any connectors found unplugged. DON’T
FORCE CONNECTORS TOGETHER. The
connectors are keyed so they only go on in
the proper orientation. A reversed edge
connector will damage a PCB.
b. Check that all plug-in integrated circuits
on the game PCB are firmly seated in their
sockets.
A WARNING
To avoid possible unpleasant electrical
shock do not touch internal parts of the
TV monitor with your hands or metal ob
jects held in your hands!
1. Voltage Selection
Before plugging in your game make sure that the
voltage selection plug on the power supply (see
Figure 3) is correct for your location’s line voltage.
Check the wire color on the plug and see if it is cor
rect per the list below.
Line Voltage Range Voltage Selection Plug Color
90-110 VAC (100) Violet
105-135 VAC (120) Yellow
200-240 VAC (220) Blue
220-260 VAC (240) Brown
2. Interlock and Power On/Off
Switches
c. Note the location of the game’s serial
number— it is on the metallic label on the
back of the game cabinet. Verify that the
serial numbers also stamped on the Game
PCB Regulator/Audio PCB and TV Monitor
are all identical. A drawing of the serial
number locations is on the inside front
cover of this manual. Please mention this
number whenever you call your distributor
for service.
d. Check all major subassemblies such as the
power supply control panel and TV monitor
for secure mounting.
To minimize the hazard of electrical shock while
working on the inside of the game cabinet two inter
lock switches have been installed (see Figure 4).
One is located behind the access panel and one is
behind the coin door. These switches remove all AC
line power from the game circuitry when a door is
opened.
Check for proper operation of the interlock
switches by performing the following steps:
1. Unlock and open the access panel and the coin
door.
2. Plug the AC line power cord into an AC outlet.
3. Close the access panel and coin door.
3

Figure 3 Power Suppl
Figure 4 Interlock and Power On/Off Switches

Asteroids
4. Set the power on/off switch to the on position.
Within 30 seconds the TV monitor should
display a picture.
5. Slowly open the rear access panel. The TV
monitor picture should disappear when the
panel is opened approximately 2.5cm (1 inch).
Close and lock the access panel and repeat this
step with the coin door.
6. If the results of step 5 are satisfactory the inter
lock switches are operating properly. If the TV
monitor doesn’t go off as described check to
see if the corresponding interlock switch is
broken from its mounting or stuck in the on
position.
3. Game Fuses
For continued protection of your game as well as
for the safety of the players fuses must be replaced
onl with fuses with identical ratings. These ratings
are shown in Figure 18. See the Schematic Drawing
Package for fuse functions.
Information on the TV monitor fuses is contained
in the TV monitor manual that is supplied with this
game.
D. Self-Test Procedure
This game will test itself and provide data to
demonstrate that the game’s circuitry and controls
are operating properly. The data is provided on the
TV monitor and the game speaker; no additional
equipment is necessary.
Part of the self-test procedure includes a display
of the operator-selectable game options. Therefore
we suggest you run the self-test procedure anytime
you need to change the game’s options.
To run the self-test follow the instructions out
lined in Figure 6.
Figure 5 Location of Self-Test Switch, Volume Control and Option Switch
5

Asteroids Figure 6 Self-Test Procedure
INSTRUCTION RESULTS IF TEST PASSES RESULTS IF TEST FAILS
1. Set self-test
switch to on posi
tion (see Figure 5).
TV monitor displays
picture as shown in
Figure 7.
RAM FAILURE is indicated by a sequence of from 1 to 6 tones. A low-frequency
tone is heard for each good RAM chip. A much lower frequency is heard for a
failing RAM chip. The sequence stops with the last failing RAM chip. To restart
the sequence, press the Reset pushbutton on the game PCB or set the self-test
switch to off, then again to the on position. Identify the bad RAM chip with table
below. Example: Three tones, then a tone of much lower frequency indicates
failure of RAM chip R4.
TONE# RAM CHIP LOCATION
D
E
M4
R4
N4
P4
ROM/PROM FAILURE is indicated by two columns or lines of numbers in the
upper left-hand corner of the display. The number in the left column or first line
indicates the failing ROM/PROM chip(s). Identify the bad ROM/PROM with table
below.
The number in the right column or second line indicates the failing data bit of
the failing ROM/PROM. Identify the bad bit with the second table below. If more
than one bit is failing, the displayed number(s) are hexadecimal combinations
of the numbers shown below. Examples:
1) If bits D and D3 fail, C is displayed.
) If bits D , D3 and D7 fail, 8C is displayed.
3) If bits D4 and D5 fail, 30 is displayed.
4) If bits D1, D3, D5 and D6 fail, 6A is displayed
DISPLAYED NO. FAILING ROM/PROM
0
1N/P3 K4, L4
3F1 F , L1 F , H1
L , L1
4
5D/E1 H , J1 H , J1 M , M1
6
7C1 K1, J J , K1 N , N1
DISPLAYED NO. FAILING BIT
1DO
D1
4D
8 D3
10 D4
0 D5
40 D6
80 D7
RAMSEL SIGNAL FAILURE is indicated by a BANK ERROR or PAGE SELECT
ERROR message at lower middle of display.
. Activate all
control panel and
coin door switches.
When satisfied with
test, set self-test
switch to off posi
tion.
1 PLAYER START
and PLAYER
START LEDs are
lighted. High-
pitched click for
each activated
switch.
1 PLAYER START and/or PLAYER START LEDs not lighted.
High-pitched click sound is not heard for any particular switch.
6

Asteroids
Figure 7 Option Switch Settings
To change toggle positions of the switch assembly, you
need not remove the game PCB. The switch, usually col
ored blue, is easily accessible when the game PCB is
mounted in place.
When changing the options, verify proper results on the
TV monitor display during self-test. A switch toggle in the
on position is indicated by a 0 for that switch on the TV
monitor display. A switch in the off position is indicated by
the number 1.
Toggle Settings of 8-Toggle Switch
on ame PCB
7 6 5 3 2 Option
On
On
Off
Off
On
Off
On
Off
On
Off
On
011
English
German
French
Spanish
-Ship Game
3-Ship Game
Center Coin Mech x 1
Center Coin Mech x 2
(Bot settings are for left
mec , if a 2-mec door)
SWITCH CTR· C0IN MECH
TO GGLE 1 MULTIPLIER (LEFT
MECH OF A 2-MECH DOOR)
RIGHT COIN MECH
MULTIPLIER
On On Right Coin Mech x 1
On Off Right Coin Mech x
Off On Right Coin Mech x 5
Off Off Right Coin Mech x 6
On On Free Play
On Off 1 Coin* for 2 Plays
Off On 1 Coin* for 1 Play
Off Off 2 Coins* for 1 Play
Suggested settings are s own in illustration at rig t.
Photograph abo e shows toggles 1, 2,
4-7 on, and toggles 3 and β off.
* Note: In the U.S. and Germany only, a “coin” is defined as 5® or 1 DM. If your game
also has $1, DM or 5 DM mechanisms, you must set the center and right coin
mechanism factors as per your choice.
Toggle Settings of 4-Toggle
Switch on Game PCB
4 3 2 1 For Games Having These Coin Doors: Option
On On Thai 1 Baht/1 Baht, German 1 DM/1 DM, U.S. 5Φ/ 5Φ,
Belgian or French 5 Fr/5 Fr, Swiss or French 5 Fr/5 Fr,
U.S. 5Φ/ 5Φ/ 5Φ, Japanese Y100/Y100, Swedish 1 Kr/1
Kr, U.K. 10 P/10 P, Australian 01/ 0®, or Italian 100
L/100 L
Off On German DM/1 DM, German 1 DM/5 DM, U.S.
5<t/ 5<t/$1, or U.S. 5<t/$1
On Off No coin door is currently designed for t is configura
tion.
Off Off German 1 DM/ DM/5 DM
All 3 coin mechanisms are
same denomination; all
register on one coin
counter.
Left and center mechanisms
are same denomination;
right mech is another
denomination. Requires two
coin counters.
Left mech is one denomina
tion; center and right mech
are another denomination.
Requires two coin counters.
Left, center and right mechs
are 3 different denomina
tions. Requires three coin
counters.
7

Asteroids
. Game Play
Atari’s Asteroids game has five possible modes
of operation: Attract Ready-to-Play Play High
Score Initial and Self-Test. Self-test is a special
mode for checking the game switches and com
puter functions. You may enter this mode at any
time. When entered all game credits are cancelled.
1. Attract Mode
The attract mode begins when power is applied to
the game after a play or high score initial mode or
after self-test. This mode is continuous and is only
interrupted when a coin is inserted and accepted or
when in self-test. In this mode the TV monitor
displays two possible pictures. Both pictures have
three score values across the top of the screen and
a message that states the number of coins for a
game. The middle score represents the high score
to date. The left score is for player 1. The right score
is for player 2.
One picture displays asteroids and an occasional
enemy spaceship “floating” across the screen. The
second picture displays up to 10 of the highest
scores since the game was last powered up or since
the last self-test. These two displays alternate every
16 seconds.
2. Read -to-Pla Mode
This mode begins when sufficient coins have
been accepted for a one- or two-player game. It ends
when the 1 PLAYER START or 2 PLAYER START
pushbutton is pressed. When this mode begins the
message PUSH START flashes immediately below
the center score at the top of the screen. The
displayed pictures are otherwise the same as those
shown in the attract mode.
3. Pla Mode
The play mode begins when either start push
button is pressed. The mode ends when the player's
last ship of the game is lost.
If the 1 PLAYER START pushbutton is pressed
the following picture is displayed: the PLAYER 2’s
score disappears; the PLAYER 1’s score becomes
00 and the number of ships (3 or 4 depending on
the operator’s setting) for the game appears below
that score. The message PLAYER 1 also appears
below the high score to date. Two seconds after
pressing the 1 PLAYER START button the PLAYER 1
message disappears and the game ship appears at
the center of the display. Four large asteroids ap
pear and drift in from the outer edges of the display.
If the 2 PLAYER START pushbutton is pressed
the following picture is displayed: the PLAYER 1
and PLAYER 2 scores become 00 and the number
of ships for the game appears below each score.
The player 1 score also flashes as the message
PLAYER 1 appears below the high score to date.
Two seconds after the 2 PLAYER START pushbut
ton is pressed the PLAYER 1 message disappears.
The game ship for player 1 appears at the center of
the display as four large asteroids appear and drift in
from the outer edges of the display.
By pressing the LEFT ROTATE and RIGHT
ROTATE pushbuttons on the control panel the
player may aim a spaceship toward any of the
asteroids. By pressing the FIRE pushbutton the
player may shoot at the asteroids.
When shot each large asteroid divides into two
medium-sized asteroids and the game adds twenty
points to the player’s score. Medium-sized
asteroids when shot divide into two small-sized
asteroids and the player receives fifty points. Small
sized asteroids when shot will completely disap
pear and the game awards 100 points to the player.
When players have shot all asteroids a new set of
large asteroids again appear and drift in from the
outer edges of the TV monitor display. At the begin
ning of the game four large asteroids appear. At the
beginning of the next cycle when large asteroids
reappear there are six the next time eight and
thereafter ten— to increase player challenge.
At any time during game play a flying saucer may
appear from either side of the display. The game
awards players 200 points for shooting a large
saucer and 1000 points for a small saucer. (The latter
is a smaller target for players though not any faster
moving than the large one. It also shoots more ac
curately.)
The player’s objective in the game is to shoot and
destroy as many asteroids as possible before all his
or her spaceships are destroyed. A ship is destroyed
if an asteroid or saucer smashes into it or if a flying
saucer shoots it. To prevent losing a ship the player
may press the THRUST pushbutton to move out of
the path of an asteroid or saucer. As an emergency
maneuver players can press the HYPERSPACE
pushbutton: the ship disappears and reappears at a
random location on the display— however possibly
right on top of or in the path of an asteroid. The
ship may also explode on reentry.
8

Asteroids
The game awards an extra ship each time a
player’s score reaches multiples of 10000; i.e. one
ship is awarded at 10 000 points another ship at
20 000 points etc.
When the last ship of the game is destroyed the
message GAME OVER appears below the high
score. This message remains for 3 seconds before
the high score initial mode begins.
4. High Score Initial Mode
At the beginning of the high score initial mode
the player instructions appear at the top of the
screen and A ____ appears at the lower center of
the display. Players enter initials one character at a
time. By pressing the LEFT ROTATE pushbutton
the displayed character steps through the alphabet
from A to Z. By pressing the RIGHT ROTATE
pushbutton the character steps backwards through
the alphabet from A to a blank, then from Z to A.
Once the game displays the desired letter players
should press the HYPERSPACE pushbutton to
record the letter; then an A appears in the next
space.
If players need only two letters for their initials
they should use the blank between Z and A in one of
the three locations. Pressing the HYPERSPACE
pushbutton a third time will cause the initials and
game score to be transferred to the “ 10 highest
scores” listing that appears during the attract mode.
9

Asteroids
Maintenance
and Repair
The Atari Asteroids game requires certain
maintenance to keep it in good working order.
Clean properly maintained games attract players
and earn more profits.
The most important maintenance item is running
the self-test every time you collect money from the
cash box. Just looking at a game will not tell you if
LED switches or leaf switches are broken or if LEDs
have burned out. The self-test will inform you of any
of these possible problems.
Second you should regularly clean the outside of
the game and the coin mechanisms. In addition you
will need to regularly clean the leaf switch contacts:
for details see this chapter.

A. Cleaning
Asteroids
1. Leaf Switch Replacement
The exterior of the game cabinet and the metal
and acrylic surfaces may be cleaned with any non
abrasive household cleaner. If desired special coin
machine cleaners that leave no residue can be ob
tained from your distributor. Do not dry-wipe any of
the acrylic panels because any dust can scratch the
surface and result in fogging the plastic.
B. Fuse Replacement
This game contains six fuses— all on the power
supply assembly (not including the TV monitor
fuses). Replace fuses only with the same type as
listed in Figure 18 of this manual. See the
Quadrascan TV monitor manual TM-146 for the
monitor fuse data.
C. Opening the Control
Panel
Prior to repairing or replacing any switch on the
control panel or prior to removing the TV monitor
unplug the game. Then open the coin door.
Reach through the opening and remove both sets
of wing nuts split lock washers and flat washers
located on the underside of the control panel (see
Figure 8). The two carriage bolts will remain in the
control panel.
Lift up on the control panel and tilt it towards you.
Be sure that the acr lic TV monitor shield does not
fall on ou. The top edge of the control panel acts as
a retainer strip for the shield: once the control panel
is opened the shield is free and could slide out
under its own power.
All five of these leaf switches operate on 5 volts at
a very low current. Therefore pitting of these
switches would be extremely rare. Probably the only
reason that pitting would occur is in very high-
humidity locations.
Don’t burnish the switches. Burnishing them
removes their plating thus increasing the corrosion
of the contacts. The best method of cleaning the
switch contacts is to wipe them with a non-abrasive
surface. A business card works very well.
To replace any switch remove both of its screws
with a Phillips-head screwdriver— see Figure 8.
If the white button itself needs to be replaced
turn the stamped nut with a wrench in a
counterclockwise direction as seen from the inside
of the control panel. The white ring on the outside of
the control panel should not spin due to its design.
2. LED Switch Replacement
The light-emitting diode (LED) switches on the
control panel have a very low failure rate. In case a
switch should ever be suspect first test it per the
description that follows. To replace the switch refer
to Figure 8.
1. Remove the wires from the suspected switch.
2. Set multimeter to ohms scale. Set ohms scale
to R x 1 then zero the meter.
3. Connect multimeter leads to appropriate LED
switch contacts (see Figure 8 for designation of
switch contacts and meter lead placement).
4. Check contacts (push and release the switch
button) for closed and open continuity.
5. If the contacts do not operate sharply or always
remain closed or open then replace the LED
switch as outlined in the figure.
12

Asteroids
LIGHT-EMITTING
DIODE (L.E.D.)
CONTACTS
NORMALLY OPEN
(N.O.) CONTACT
NORMALLY
CLOSED
(N.C.) CONTACT
L.E.D S ITCH:
TO REMOVE TURN
COUNTERCLOCK ISE
To remove LED switch:
Remove all wires from the faulty switch.
Turn the switch counterclockwise while holding the
black cone-shaped nut on the outside of the control
panel.
Install a new switch using the reverse procedure.
Reconnect the harness wires.
NOTE ------------------
Adjust leaf switches for a narrow gap. When a
switch button is depressed the resulting wip
ing action of the contacts provides a self
cleaning feature.
LEAF S ITCH
TURN NUT
TO REMOVE
HITE BUTTON
Figure 8 Opening the Control Panel
13

Asteroids
D. TV Monitor
Replacement
--- A WARNING ------------
High voltages may exist in any television unit
even with power disconnected. Use extreme
caution and do not touch electrical parts or the
TV yoke area with your hands or with metal ob
jects in your hands!
If you drop the TV monitor and it breaks it will
implode! Shattered glass and the yoke can fly
6 feet or more from the implosion. Use care
when replacing any TV monitor.
If you should need to remove the Quadrascan X-Y TV
monitor follow steps 1 thru 6 on this page. Refer
also to Figure 9 below.
1. Open the control panel as described in Section
C Opening the Control Panel. Be sure the game
is unplugged from its wall outlet!
2. Remove the acrylic TV monitor shield by sliding
its lower edge out.
3. Working up from the bottom side corners
carefully pry loose the two side flaps of the
colorful 2-piece cardboard bezel. (A 4-inch strip
of double-sided adhesive tape is centered
behind both side flaps flush with each edge.)
Remove the bezel as a complete unit— do not
remove the smaller part first.
4. Open the rear access panel and unplug the TV
monitor harness connectors— both are on the
TV’s printed circuit boards.
5. Remove the four sets of carriage bolts flat and
split lock washers and hex nuts that hold down
the metal TV chassis.
6. Carefully slide the TV monitor chassis out the
front of the game.
Disassemble
in the order
indicated
Figure 9 TV Monitor Removal
1

Asteroids
. Printed Circuit Board
Replacement
You may wish to remove the game printed circuit
board (PCB) or the Regulator/Audio PCB for service
or inspection. To do this refer to Figure 10 and pro
ceed as follows:
1. Open the rear access panel.
2. Locate the securing screws and fiber washers
that hold down the PCB in its slots and remove
them. (The game PCB has two the Regulator/
Audio PCB has one set of this fastening hard
ware.)
3. If you are removing the game board first remove
the two machine screws or tie wraps that fasten
the edge connector to the game PCB. Then
unplug the edge connector on the game PCB. If
you are removing the Regulator/Audio PCB
simply disconnect the three small harness con
nectors on this board.
4. Carefully slide either PCB straight out of its
slots. Be careful not to twist the board as this
may loosen connections or components. Re
place or repair as required.
5. Reinstall the PCB making sure that the connec
tors are properly plugged in. Note that they are
keyed to fit on only one way so if they don’t slip
on easily don’t force them! A reversed connec
tor will probabl damage our game and will
void the warranty.
6. Replace the securing screws and fiber washers
in the PCB. Reinstall the fasteners used to
secure the edge connectors to the PCB. Close
and lock the rear access panel.
7. Check that the operation of the game is correct
and perform the self-test. This is especially im
portant with any game when you replace a PCB.
Normally the onl adjustments on the Asteroids
game are option switch changes (made on the
4-toggle and 8-toggle DIP switches). Unless you
are qualified technician do not turn any of the
knobs near the game PCB’s edge connector.
Also do not turn the small knobs on the
Regulator/Audio PCB.
Figure 10 Game and Regulator/Audio PCB Replacement
15