Williams Robotron May 82 Instruction Manual

							16P-3005-101
May, 1982
INSTRUCTION MANUAL
FOR
UPRIGHT AND COMPACT GAMES
Including procedures for…
• Operation
• Auditing
• Adjustment
• Diagnostics
For service…
NOTE NEW TOLL-FREE
TELEPHONE NUMBERS:
800-621-1253
In Illinois call:
800-572-13243401 N. California Av.
Chicago, IL 60618
Cable Address: WILCOIN, CHICAGO
(312) 267-2240 
						

							2
ROM SUMMARY
Current Robotron Games use blue-label ROMs.  Earlier games
have either yellow or red-label ROMs, which are interchangeable
and may be mixed in the same game.  DO NOT attempt to mix
blue-label ROMs with red or yellow-label ROMs.
ROM    PART NO. DESCRIPTION
ROBOTRON 1B A-5343-09898 PROM, 4Kx8, RED or YELLOW LABEL
A-5343-09945 PROM, 4Kx8, BLUE LABEL
ROBOTRON 2B A-5343-09899 PROM, 4Kx8, RED or YELLOW LABEL
A-5343-09946 PROM, 4Kx8, BLUE LABEL
ROBOTRON 3B A-5343-09900 PROM, 4Kx8, RED or YELLOW LABEL
A-5343-09947 PROM, 4Kx8, BLUE LABEL
ROBOTRON 4B A-5343-09901 PROM, 4Kx8, RED or YELLOW LABEL
A-5343-09948 PROM, 4Kx8, BLUE LABEL
ROBOTRON 5B A-5343-09902 PROM, 4Kx8, RED or YELLOW LABEL
A-5343-09949 PROM, 4Kx8, BLUE LABEL
ROBOTRON 6B A-5343-09903 PROM, 4Kx8, RED or YELLOW LABEL
A-5343-09950 PROM, 4Kx8, BLUE LABEL
ROBOTRON 7B A-5343-09904 PROM, 4Kx8, RED or YELLOW LABEL
A-5343-09951 PROM, 4Kx8, BLUE LABEL
ROBOTRON 8B A-5343-09905 PROM, 4Kx8, RED or YELLOW LABEL
A-5343-09952 PROM, 4Kx8, BLUE LABEL
ROBOTRON 9B A-5343-09906 PROM, 4Kx8, RED or YELLOW LABEL
A-5343-09953 PROM, 4Kx8, BLUE LABEL
ROBOTRON 10B A-5343-09907 PROM, 4Kx8, RED or YELLOW LABEL
A-5343-09954 PROM, 4Kx8, BLUE LABEL
ROBOTRON 11B A-5343-09908 PROM, 4Kx8, RED or YELLOW LABEL
A-5343-09955 PROM, 4Kx8, BLUE LABEL
ROBOTRON 12B A-5343-09909 PROM, 4Kx8, RED or YELLOW LABEL
A-5343-09956 PROM, 4Kx8, BLUE LABEL
Decoder ROM 4  A-5342-09694 PROM, 512x8
(Horizontal)
Decoder ROM 6 A-5342-09821 PROM, 512x8
(Vertical)
Video Sound ROM 3  A-5343-09910 ROM, 4Kx8
Special Chip 1 A-5410-09911 Special Chip 
						

							3
POWER TURN-ON
CAUTION - This game must be plugged into a properly grounded outlet to prevent shock hazard and to ensure proper game
operation.  DO NOT use a cheater plug to defeat the ground pin on the line cord, and DO NOT cut off the ground pin.
WHEN THE GAME IS FIRST TURNED ON it produces a sound.  Simultaneously general illumination should come on
and a moment later a scanning “rug pattern” indicating the RAM test should appear on the screen.  Next the rug should
become stationary as the ROM test is performed.  In a correctly running game the rug pattern will be followed by the message
INITIAL CHECKS INDICATE: OPERATIONAL.  If RAM or ROM failure messages come up on the screen instead, refer
to Power-Up Tests in TROUBLESHOOTING PROCEDURES.
GAME OPERATION
GAME START - Insert coins; a random sound is produced and credits are displayed on the CRT.  With one or more credits
displayed, pressing 
1-player start initiates a l-player, *3-turn game.  With two or more displayed, pressing 
2-player start
initiates a 2-player, *3-turn game.
PLAYER CONTROLS
MOVE JOYSTICK (LEFT) maneuvers mutant clone (our hero) in any of eight directions: N-NE-E-SE-S-SW-W-NW.
FIRE JOYSTICK (RIGHT) fires anti-robot laser gun in same eight directions.
GAME PLAY
ROBOTS ARE THE ENEMY - The player (represented by the mutant clone) must deactivate six types of robots with a laser
gun.  However the robots armada including tanks, electrodes and cruise missiles will be deployed against the mutant.
Meanwhile defenseless normal clones must be protected by the mutant or they will be captured and reprogrammed by the
robots.  Arriving at 25,000* points (or any multiple of 25,000), the mutant is awarded a new opportunity to defend his clone-
kinsmen.
HIGH SCORE SIGNATURE
Select letters with the MOVE joystick.  Push up to move forward through the alphabet; pull down to move backward.  Then
push the FIRE joystick up to lock in the letter.
BOOKKEEPING AND EVALUATION TOTALS
1. In Game-Over Mode, open the cashbox and depress the cashbox advance switch.  The advance switch located on the
coin door can also be used.  The CRT should indicate all bookkeeping and evaluation totals.  If so, go to step 3.  If the
CRT display comes up in the ROM test, perform step 2.
AUTO-UP
HIGH
SCORE
RESETMANUAL
DOWNADVANCE
Figure 1.  Coin Door Button Switches
2. Continue to depress the cashbox advance switch, stepping the game through test programs for ROMs, RAMs, CMOS
RAMs, color RAMs, sounds, switches, and then CRT test patterns, of which there are five.  The fifth test pattern, color
bars, directly precedes the CRT display of the bookkeeping and evaluation totals.
3. The bookkeeping and evaluation totals appear on the displays as in Figure 1.
* Adjustable feature 
						

							4
CLEARING BOOKKEKPING TOTALS
1. Depress ADVANCE to display Game Adjustments.
2. Operate MOVE joystick to position cursor on CLEAR BOOKKEEPING TOTALS.
3. Push FIRE.
4. Depress ADVANCE.
Figure 1. Bookkeeping display
GAME ADJUSTMENTS
In the Game-Over Mode open the coin door with AUTO-UP, and depress the coin door ADVANCE switch twice to cause a
CRT display as shown in Figure 2.
To select and then set functions to the desired values, use the MOVE (UP-DOWN) joystick to select the that is to be changed
and then, making sure the coin door is open, use the FIRE (UP-DOWN) joystick to increase or reduce the value of the selected
function.
The number of turns per game can be set anywhere from 1 to 20 (3 recommended).  Difficulty is factory-programmed at 3
(liberal).  It can be custom-programmed (0-10, with 10 conservative) as desired.
Game pricing is selected with standard settings or with custom settings as shown in Tables 1 & 2. Table 1 lists some common
pricing schemes and directs the reader to the proper entry in Table 2, which shows what the CRT display should look like to
accomplish the desired pricing.  Note that free play can be elected by entering the code number 9 at the PRICING
SELECTION function (see Tables 1 and 2).
For standard settings you need change only the PRICING SELECTION.  For custom settings, first set PRICING  SELECTION
to zero and then set the remaining values according to Table 2.
BOOKKEEPING TOTALS
LEFT SLOT COINS   167
CENTER SLOT COINS       0
RIGHT SLOT COINS   426
PAID CREDITS   593
EXTRA MEN EARNED   221
PLAY TIME IN MINUTES 1200
MEN PLAYED 2000
CREDITS PLAYED   593
AVERAGE TIME PER CREDIT  2:01
AVERAGE TURNS PER CREDIT  3.37 
						

							5
Figure 2. Game Adjustment
Highest Score Signature
The number of letters allowed the highest scoring player for entering his name can be varied from 3 to 20 and is recommended
as 3.  If objectionable words are entered as the signature name, you can change the lettered entry leaving the highest score the
same.  See Setting Highest Score Name.
Restore Factory Settings
1. Position the cursor on RESTORE FACTORY SETTINGS.
2. Push FIRE.
3. Depress ADVANCE.
Resetting High Score Table
1. Position the cursor on RESET HIGH SCORE TABLE.
2. Push FIRE.
3. Depress ADVANCE.
Setting Attract Mode Message
1. Position the cursor on SET ATTRACT MODE MESSAGE.
2. Push FIRE.
3. Depress ADVANCE.
4. Enter up to two lines of your message following instructions on the screen
5. Depress ADVANCE to terminate process.
NOTE:
To restore the Williams attract mode message, it is necessary to
perform steps 1 through 3 and then turn the game OFF then ON.
Setting High Score Name
1. Position the cursor on SET HIGHEST SCORE NAME.
2. Push FIRE.
3. Depress ADVANCE.
4. Enter new signature; depress ADVANCE to terminate process.
NOTE:
An alternate, simpler method enters the factory highest score signature.
 In the game over mode, hold HIGH SCORE RESET Depressed. After
a few seconds a sound is produced and the factory highest score
signature has been activated.
GAME ADJUSTMENT
EXTRA MAN EVERY 25000 RECOMMENDED
TURNS PER PLAYER     3 RECOMMENDED
PRICING SELECTION     3 1/QUARTER 4/DOLLAR
   LEFT SLOT UNITS     1
   CENTER SLOT UNITS     4
   RIGHT SLOT UNITS     1
   UNITS REQUIRED FOR CREDIT     1
   UNITS REQUIRED FOR BONUS CREDIT     0
   MINIMUM UNITS FOR ANY CREDIT     0
FANCY ATTRACT MODE   YES
DIFFICULTY OF PLAY     3 LIBERAL
LETTERS FOR HIGH SCORE NAME      3 RECOMMENDED
RESTORE FACTORY SETTINGS    NO
CLEAR BOOKKEEPING TOTALS    NO
HIGH SCORE TABLE RESET    NO
AUTO CYCLE    NO
SET ATTRACT MODE MESSAGE    NO
SET HIGH SCORE NAME    NO
USE -MOVE- LEVER TO SELECT ADJUSTMENT
USE -FIRE- LEVER TO CHANGE THE VALUE
PRESS ADVANCE TO EXIT 
						

							6
Table 1. Pricing Schemes
COIN DOOR MECHANISM CREDITS/MONEYTABLE 2
STANDARD SELECTION/
CUSTOM KEY
Twin Quarter
Quarter, Dollar, Quarter1/25¢, 5/$1
2/50¢, 5/$1
1/25¢, 4/$1
2/50¢, 4/$1
1/50¢, 3/$1, 4/$1.25
1/50¢, 3/$1, 7/$2
1/50¢, 3/$1, 6/$2
1/50¢A
B
3
C
D
E
1
5
1DM, 5DM 1/1DM, 6/5DM 2
20-Cent, 50-Cent 1/20¢, 3/50¢ F
1 Franc, 5 Franc 1/2F, 3/5F 4
25 Cent 1/25¢, 4/1G 6
1 Guilder 1/25¢, 5/1G G
5 Franc 1/5F, 2/10F 7
10 Franc 1/10F 8
1 Franc, 2 Franc 2/1F 5/2F 2
100 Lire, 200 Lire 1/200 Lire 8
Twin Coin 1/1 Coin
1/2 Coins
1/3 Coins, 2 5 Coins3
5
H
1 Unit, 5 Unit 1/2, 3/5
1/1, 5/5
1/3, 2/54
I
J
FREE PLAY - 9
Table 2. Pricing Settings
CUSTOM KEY
DISPLAY
FUNCTIONSSTANDARD SELECTION
ABCDE FGH I J
Pricing Selection
Left Slot Units
Center Slot Units
Right Slot Units
Units per Credit
Units for Bonus Credit
Minimum Units for Credit1
1
4
1
2
4
02
6
0
1
1
0
03
1
4
1
1
0
04
1
16
6
2
0
05
1
4
1
2
0
06
1
0
4
1
0
07
1
0
2
1
0
08
1
0
2
2
0
09
1
4
1
1
0
00
1
4
1
1
4
00
1
4
1
1
4
20
1
4
1
1
0
20
3
12
3
4
15
00
12
48
12
14
96
240
6
0
15
5
0
00
1
0
4
1
4
00
2
0
2
5
0
00
1
0
5
1
0
00
2
0
10
5
0
0 
						

							7 TROUBLESHOOTING PROCEDURES
Certain types of game malfunctions may inhibit the games
diagnostic or display faculties.  Troubleshooting procedures
for most of these types of malfunctions as well as
malfunctions that permit self-diagnosis are covered below.Our troubleshooting algorithm begins with 
Power-Up and
continues until 
Game Over Mode.  All procedures can be
performed with minimal test equipment or merely by
observing the game itself.
POWER-UP TESTS
NO GENERAL
ILLUMINATIONNO INITIAL VIDEO
(RUG PATTERN)CHECKING POWER
SUPPLY BOARD
(1) Check fuse F2 on power supply board.
(2) Check for proper installation of jumpers
W1, W2, W3 and/or resistor R27. (Some
machines DO NOT have an R27. Refer to your
drawing set.)
(3) Check 4P1/J I, 4P3/J3, 6P2/J2 and 6P3/J3.
(4) If all the above dont turn up the problem
check power supply board.(1) Open back doors
(2) Press reset button on CPU Board.
(3) Try RAM and ROM tests (see below).
(4) If all the above dont turn up the problem,
check power supply board.(1) Swap power supply board with one from
known-good game.
(2) If game plays, problem is on power supply
board.
(3) If game doesnt play, check power
transformer with voltmeter.
(4) If known-good power supply is unavailable
for  tests above, check +5V, – 5V and + 12V
outputs on power supply in game.   Each
MUST BE within 2% of rated output with less
than 0.1% AC hum.
MORE POWER-UP TESTS
TESTROM BOARD
LEDs
RECOGNIZE
CONDITIONROM BOARD
LEDs
IDENTIFY
CHIPSVIDEO REMEDY
GENERAL “0” means all
power-up tests
passed- (1) Scanning rug pattern
(2) Stationary rug pattern
(3) INITIAL TESTS INDICATE:
OPERATIONAL
(4) Game-Over ModeIf any video (see left) is missing or
error message is displayed, proceed to
Diagnostic Mode
 tests.
“0” means tests
passed- “HIGH SCORE TABLE RESET”
“BOOKKEEPING TOTALS CLEARED”
“ADJUSTMENT FAILURE”
“RESTORE FACTORY SEITINGS BY
OPENING FRONT DOOR AND
TURNING GAME OFF AND ON”(1) Open coin door and turn power
off and on.CMOS
(See Appendix A)
“0” means tests
passed- “FACTORY SEITINGS RESTORED” (2) Press ADVANCE. Game should
return to Game-Over Mode.
BATTERY
(See Appendix A)“0” means tests
passed- “HIGH SCORE TABLE RESET”
“BOOKKEEPING TOTALS CLEARED”
“ADJUSTMENT FAILURE”
“RESTORE FACTORY SEITINGS BY
OPENING FRONT DOOR AND
TURNING GAME OFF AND ON”(1) Open coin door and turn power
off and on. Or press ADVANCE.  In
either case, game should return to
Game-Over Mode.
(2) Check AA alkaline cells on CPU
Board.
(3) If problem persists proceed with
CMOS RAM test by putting the game
into its Diagnostic Mode
 (see SELF-
DIAGNOSTICS).
MEMORY
PROTECT
INTERLOCK
(See Appendix A)“0” means tests
passed- “HIGH SCORE TABLE RESET”
“BOOKKEEPING TOTALS CLEARED”
“ADJUSTMENT FAILURE”
“RESTORE FACTORY SEITINGS BY
OPENING FRONT DOOR AND
TURNING GAME OFF AND ON”(1) Making and breaking coin door
interlock switch, check with VOM
and replace if faulty.
(2) Replace if faulty: Memory protect
gates 6E, IC1, Ql, or CMOS RAM
1C.
SPECIAL CHIP “0” means tests
passed- (1) Scanning rug pattern.
(2) Blank screen instead of “INITIAL
TESTS INDICATE: OPERATIONAL”
(3) High score table with no scores.
(4) Intro blank or program crash.(1) Turn power off.
(2) To find bad chip replace 2 special
chips one at a time with known good
chips.
(3) Turn Machine on after each
replacement and run through Power-
Up Tests. 
						

							8
+5v DC ADJUSTMENT (R10 & R24)
Before adjusting the voltage output, always check the output at the supply for AC hum.  This hum should never rise above
0.005v on the +5v DC supply.  If it does, consult your schematic drawing set for proper DC voltages throughout the circuit.
Test for these with the DC setting of your multimeter.  Make a second check using the AC setting.  Pay particular attention to
readings at TP5 (top of capacitor C10).  If the voltage here is too low (less than +11v DC) or you find excessive ripple (more
than 700mv rms), replace the capacitor.
Table 3 Voltage Adjustments to +5v Dc Supply
WHICH RESISTORS
SUPPLY HAS . . .Neither R10 only R24 Only R24 & R10
TO INCREASE VOLTAGE
IF UNDER 4.25v DC . . .Add R24 Remove R10 or add
R24- Remove R10 or add
R24
TO DECREASE VOLTAGE
IF OVER 5.25v DC . . .Add R10 - Remove R24 or add
R10Remove R24 or add
R10
SELF DIAGNOSTICS
If RAM or ROM failure messages are displayed on the CRT after the “rug pattern” proceed with self-diagnostics.  Self-
diagnostic procedures are controlled by the AUTO-UP/MANUAL-DOWN and ADVANCE switches in the coin door.  Set the
AUTO-UP/MANUAL-DOWN switch to the MANUAL-DOWN position and depress the ADVANCE pushbutton.  The game
is now in its 
Diagnostic Mode and a ROM test is performed.  With ROM test results present on the CRT display, depressing
the ADVANCE pushbutton initiates the RAM test.  Further tests (CMOS, sound, switch, color RAM, monitor test patterns) are
encountered one after the other as the ADVANCE pushbutton is depressed (once more for each subsequent test).
MONITOR TEST PATTERNS - For ease in monitor adjustments, the monitor may be slid back and the screen viewed in the
CRT mirror provided on the inside-top of the cabinet.  Remove the two bolts and carefully slide the monitor back in its shelf;
secure the monitor in the extended position by inserting the two bolts though holes in the monitor base and monitor shelf
provided at the left side of the monitor.
AUTO CYCLE MODE - From the color bar pattern (or Game Over with the switch set to AUTO-UP) depress ADVANCE
two times to display GAME ADJUSTMENTS.
1. Position the cursor on AUTO CYCLE with the MOVE Joystick and push the FIRE joystick up.
2. Depress ADVANCE.
3. The system will now sequence through ROM, RAM, and CMOS RAM tests repeatedly.  The coin door must be open
during the Auto Cycle test.  If an error is detected, the test is terminated and the failure indication is displayed on the
CRT.
4. To terminate the Auto-Cycle test, turn the game OFF and ON.
Figure 4. RAM Location and Numbering on the CPU Board 
						

							9
DIAGNOSTIC MODE RAM AND ROM TESTS
TESTROM BOARD
LEDs
RECOGNIZE
CONDITIONROM BOARD
LEDs
IDENTIFY
CHIPSVIDEO REMEDY
ROM “2” means ROM
error.2-digit ROM
chip number“ROM ERROR” and ROM chip no. (1) Turn power off.
(2) Replace suspected chip.
RAM “1” means RAM
error.Bank number
first . . . then
chip number in
bank (see figure
3)“RAM ERROR” followed by RAM
bank number and chip number (Note:
with multiple RAM failures this
display may not appear)(1) Check for normal voltages on
indicated RAM chip: -5v/pin 1,
+12v/pin 8, +5v/pin 9.
(2) Turn power off.
(3) Replace suspected chip.
(4) With multiple RAM failures
always check power supply. See
POWER-UP TESTS.
CMOS
(See Appendix A)“3” means CMOS
RAM error-“CMOS RAM ERROR OR WRITE
PROTECT FAILURE”(1) Check pin 22 of CMOS RAM
for +3.8VDC. If present, replace
CMOS chip 1C. If absent replace
AA alkaline cells.
(2) With new alkaline cells, check
for +3.8VDC
.  If still absent,
replace diodes D9 and D10.
(3) Upon power-up and re-entry
into diagnostics if CMOS error
message persists check CMOS
RAM memory protect and
address decoding circuits with a
logic probe.
Tests 4 and 7 provide sequential subtests.  To stop automatic cycling set switch to MANUAL-DOWN  Depress advance
in MANUAL-DOWN to step through subtests.  LED indications are not made for these tests.
TEST & PROCEDURES VIDEO REMEDY OR ADJUSTMENT
Missing CheckSOUND
(Test 4)“SOUND LINE 1”
“SOUND LINE 2”
“SOUND LINE 3”
“SOUND LINE 4”
“SOUND LINE 5”
“SOUND LINE 6”
(These appear one at a time)1
2
3
4
5
6
All2P4/lOP3 Pin 3
2P4/10P3 Pin 2
2P4/10P3 Pin 5
2P4/10P3 Pin 4
2P4/10P3 Pin 7
2P4/10P3 Pin 6
Perform 
Sound Board
Diagnostics (see below)
CRT indicates AUTO-UP closed and any stuck
switches
. CRT Display for Each Switch . . .
Coin Door Player Panel
SWITCH TEST
(Test 5)
(1)  Set switch to MANUAL-DOWN
and clear any stuck switches.
(2)  CRT should indicate no switches
closed.
(3)  Operate switches and check for
display of switch name.ADVANCE
AUTO-UP
HIGH SCORE RESET
LEFT COIN
CENTRE COIN
RIGHT COIN
SLAM SWITCH1- PLAYER START
2- PLAYER START
MOVE UP
MOVE DOWN
MOVE LEFT
MOVE RIGHT
FIRE UP
FIRE DOWN
FIRE LEFT
FIRE RIGHT(1)  COIN DOOR SWITCH STUCK:
Disconnect 2P3
(2)  PLAYER PANEL SWITCH
STUCK: Disconnect 3P2 or 3P3
(3)  COIN DOOR SWITCH DOES NOT
OPERATE: Ground corresponding pin
of 2P3.
(4) PLAYER PANEL SWITCH DOES
NOT OPERATE: Ground corresponding
pin of 3P2 or 3P3
SYMPTOM REMAINS SAME . . .
ROM Board or Interface Board Faulty.
SYMPTOM CLEARS UP . . .
Problem is in switches or wiring 
						

							10
MORE DIAGNOSTIC MODE TESTS
TEST & PROCEDURESVIDEO
SEQUENCESREMEDY OR ADJUSTMENT
RAM 1B RAM 2B
1 Light red screen
2 Red screen
3 Dark red screenToo-light or
too dark red
or gray bandMagenta band
4 Light green screen
5 Green screen
6 Dark green screenYellow band Cyan band
7 Light blue screen
8 Blue screenMagenta band Too-light or too
 dark blue or
gray band
4 Light green screen Green band Dark green band
or gray band
5 Green screen Light green band Dark green band
or gray band
COLOUR RAM TEST
(Test 6)
Note that a blank sequence or two sequences with the same
shade indicate a faulty 1A flip-flop, 1B RAM or 2B RAM
or a failure in the color analogue circuit.  Check voltages on
Q1 (green transistor), Q2 (red transistor) and Q3 (blue
transistor).  During the eight full screen color tests, the base
voltage (center Pin) on each transistor should vary between
3.8v (brightest color) and 4.4v (no color)
(1) CRT sequences through 8
colors, 2 seconds each
(2) Thick vertical band
indicates color RAM fault.
6 Dark green screen - Grey band
Cross hatch patternAids you in setting up vertical and
horizontal linearity, convergence and
focus.
Red screen
Green screen
Blue screen
Color BarsAids you in optimizing color purity
MONITOR & COLOUR RAM TEST
(Test 7)
12 34 5 678
    1 = RED
    2 = GREEN
    3 = BLUE
    4 = WHITE
    5 = BLACK
    6 = YELLOW
    7 = CYAN
    8 = MAGENTA
Color Bar PatternColor Bars
•
 Double-width
•
 Half-width
•
 Transposed
•
 MissingIf color RAM test 6 indicates no faults,
symptoms at left suggest a fault in 1A,
1B, 2B or 2C chips.
SOUND BOARD DIAGNOSTICS
Depress the DIAGNOSTIC pushbutton on the bottom of the Sound Board.  A check is made of the Sound ROM and sounds
are produced if the check is good.  If sounds are produced but not in Audio Test 5 check for ROM board PIA output on Sound
Board inputs that are stuck low.  If no sound is produced either the Sound ROM, IC12, input power, or other Sound Board
circuitry is faulty.