Play Ball Model 4001A Operation and Service Manual
Contents
1. eee tt TIIIIIIITI IIIIIITIIITI IUE T IT IITITZIIIITIIIII IG ICCIGCITITrIIIIII x ma ORI ROI POR H High L Low X Irrelevant FIGURE 10 14 The 7448 integrated circuit that is used to decode a BCD output such as that from the 7490 previously dis cussed is shown in Figure 8 This circuit converts the four outputs of the BCD counter into seven outputs which when used to drive a Seven Segment Readout will display in numerical form the count configuration of the counter and change it into a readable numerical form The numer ical designations of the resultant display are shown in Figure 8a The 7475 latch circuit is shown in Figure 9 This device contains the equivalent of four flip flops that operate similar to the 7474 previously discussed The flip flops here are not edge triggered however Inform ation present at the data D inputs is transferred to the Q output when the clock is HIGH and the Q output will follow the data input as long as the clock remains HIGH When the clock goes LOW the information that was present at the data input at the time the transition occurred is retained at the Q output until the clock is permitted to go HIGH2. og mgr eere Ch psp Ee aka OUTPUTS bolso M cc om u ee CARRY l BORROW SEQUENCE ILLUSTRATED 1 14 NOTES A Clear overrides load date and count inputs B When counting up count down input must be high when counting down count up input must be high FIGURE 12 Vom 16 Figure 11 illustrates the 7442 is generally used in decoding and logic conversion applications It decodes a four bit BCD number from the 7493 for instance and converts it to l of 10 output configuration The 7442 is used in the PLAY BALL game to provide sequential animation from a binary counter The circuit shown in Figure 12 represents the 74193 This counter has a capability of counting from 0 to 15 as did the 7493 previously discussed but it possesses the capability of counting in either direction There are two separate inputs pins 4 amp 5 one for count up Operation and one for count down operation Count operation is triggered by a low to high level transition of either count clock input The direction of counting is determined by which count input is pulsed while the other count input is held HIGH A CLEAR input is provided which forces all outputs to the LOW state when a HIGH level is applied The CLEAR function is independent of the count inputs and overrides
3. SUM a y NM M Y E TRR TAE 2 002 7 087 2 087 25 087 2 089 087 3872 0 12 7 ga Lla 44 252 22 492 4 72 10S DIGENE 22 42 gl 597 0 tO TS 09092 SO 29092 20 ZS 1 90 JJW 19 5 aR 56 22 17 20 Reference pesig U 9 11 15 17 19 20 24 25 32 51 U 22 39 40 42 49 50 U 10 16 21 37 U 48 U 27 28 30 U 43 44 45 46 U 5 6 8 18 52 U 33 34 35 36 U 1 2 3 4 23 U 7 13 14 53 U 41 U 12 29 U 26 31 38 47 Q 1 thru Q 62 amp Q 67 SCR 1 5 amp 7 9 Q 63 64 65 66 SCR 6 10 D 1 thru D 10 C 13 C 4 6 8 9 10 11 12 14 17 18 19 20 21 22 23 24 25 26 27 28 29 C 1 R 6 52 53 57 R 86 R 1 thru R 4 R 17 33 44 48 59 63 70 75 78 85 R 8 12 35 43 56 45 R 5 R 7 9 10 13 16 37 38 40 41 42 49 51 54 55 64 66 68 69 76 77 R 12 R 10 R 36 R 58 R 39 67 R 11 34 PARTS LIST Logic Board Assembly 4001A DLC Description 7400 H AAAAAAAANAA 0 7404 7408 7410 7442 7448 7474 7475 7490 7493 74154 74193 555 HHH HH H H H H H H a Transistor 2N2222A 2N4401 SCR 2N5060 SCR MCR 106 1 Diodes 1N4002 Cap 250pfd 50V Cap 05mfd 50V Cap 15mfd 50V Cap Imfd 16 Cap 4 7mfd 16V Cap lOmfd 16V Cap 22mfd 16V Cap 100mfd 16V Res 180 1 2W Res 330 1 2W Res 390 1 2W Res 680 1 2W Res 1 1 2W Res 4 7K 1 2W Res 10K 1 2W Res 27K 1 2W Res
4. E NM NM NU S GN E PLAY BALL MODEL 2001A AN ELECTRONIC GAME BY GREMLIN INDUSTRIES INCORPORATED OPERATION AND SERVICE MANUAL PLAY B A L L ELECTRONIC WALL GAME by GREMLIN INDUSTRIES INCORPORATED 7030 Convoy Court San Diego California 92111 OPERATING INSTRUCTIONS and SERVICE MANUAL TABLE OF CONTENTS INTRODUCTION page 1 UNPACKING amp INSPECTION page 2 PLAY BALL DESCRIPTION page 3 SYSTEM DESCRIPTION page 5 INTEGRATED CIRCUIT CHARACTERISTICS page 9 DETAILED CIRCUIT DESCRIPTION page 19 POWER SOUND BOARD page 30 page 32 MAINTENANCE PROCEDURES page 33 PROGRAMMING amp ADJUSTMENTS page 40 SCHEMATICS following pages INTRODUCTION PLAY BALL is an electronic game that makes extensive use of digital integrated circuits This manual assumes that the maintenance technician possesses a general knowledge of solid State circuitry and TTL digital integrated circuits Any individual not knowledgable in this area should not attempt to repair the electronic portions of the game SHOULD BE NOTED THAT ANY ATTEMPT TO REPAIR THE GAME IN THE FIELD WITH OUT THE EXPRESS CONSENT OF THE FACTORY WILL IMMEDIATELY VOID THE WARRANTY IMPORTANT NOTES
5. NEVER replace any component with anything other than an EXACT replacement part This includes LAMPS TRANS ISTORS INTEGRATED CIRCUITS and the like LAMPS used in this game are 1813 which operate at 14 4 volts 100 ma and 756 lamps which operate at 14 4 volts 80 ma NEVER use a lamp that operates at a lower voltage or higher current To do so will very likely damage the circuitry in the game DO NOT use metal objects screwdrivers pliers etc around the lamp sockets with the game turned ON The outer shell of the sockets have voltage on them and shorting them to each other or to other points on the game will damage the circuitry DO NOT replace the fuse with anything other than the proper value A blown fuse indicates an overload condition within the game Replacing the fuse with a larger value can cause severe damage to internal components if an overload occurs ALWAYS consult the manual before attempting repairs CORRESPONDENCE regarding this game should be addressed to GREMLIN INDUSTRIES INCORPORATED 7030 Convoy Court San Diego California 92111 Phone 714 277 8700 UNPACKING AND INSPECTION The PLAY BALL Game is normally shipped in two packages one containing the game main frame and the other package containing the Coin Box Transmitter and accessories Both boxes should be opened immediately upon arrival and inspected for freight damage It is advisable to connect the game for operation and dete
6. The 7475 is commonly used between a decade counter circuit and a decoder driver circuit such as the 7448 In this application the clock input is held LOW retaining the previous display while the counter is advancing When the desired count is reached the clock on the 7475 is allowed to go HIGH and the information from the counter is then allowed to be transferred to the decoder driver changing the presentation to the new resultant display This eliminates the distraction of seeing the numbers randomly cycling until the proper count is reached and it also adds versatility to the circuitry Figure 10 depicts the 74154 This circuit decodes the 4 BCD inputs applied to it from a 4 bit counter similar to the 7493 for instance into sixteen individ ual outputs Thus for every possible state of the BCD count of sixteen there is one output of the 74154 that will change to the LOW state Figure 10 shows the truth table for the device In operation if a counter input were applied to the circuit and allowed to count normally the output of the 74154 would progressively sequence from 0 to 15 and continue to repeat the sequence N7442 BCD TO DECIMAL DECODER TRUTH TABLE BCD DECIMAL INPUT OUTPUT 5 5 200 200 00 00 0 20 0 0 0 0 0 0 DATA b COUNT UP COUNT DOWN l
7. Diodes D 1 and D 2 rectify the AC input at pins 18 and 20 Capacitor C 1 provides filtering and the resultant DC Voltage is routed out on pin 12 to the external Voltage Regulator which provides regulated 5 VDC for the Logic Board SCR s Q 1 through Q 4 provide the Power Buss Switching as previously described Using Q 1 as an example signal is applied from the Logic Board through D 4 to the gate The SCR turns on and allows the 14 Volt rectified power at its anode to pass through The cathode terminal is routed off the board to the proper Power Buss SCR s Q 1 through Q 4 all operate in an identical manner The anode of SCR 5 has a capacitor C 7 attached to it C 7 is charged through D 8 and R 13 and maintains full charge until SCR 5 is triggered at which time it discharges through the SCR and the discharge path is continued through an external speaker The short current pulse thus produced causes the speaker to Pop giving a sound similar to a bat striking a ball Q 6 is a voltage regulator that provides a regulated power source to the crowd noise circuitry Q 7 is an NPN transistor which with its emitter base junction back biased in the manner shown breaks down and produces random high frequency noise spikes This White Noise is amplified by Q 8 and Q 9 and applied to Q 13 0 13 is a filter circuit that removes some of the higher fre quencies for a more realistic sound The output of Q 13 is routed through volume con
8. 47K 1 2W Res 56K 1 2W Res 62K 1 2W Res 390K 1 2W Pot 100 48 Gremlin Part 314 0009 314 0015 314 0012 314 0010 214 0011 314 0013 314 0006 314 0017 314 0003 314 0005 314 0008 314 0007 314 0001 482 0003 482 0014 482 0009 482 0012 481 0001 151 0004 151 0001 152 0011 150 0009 150 0007 150 0006 150 0011 150 0010 471 0181 471 0331 471 0391 471 0681 471 0102 471 0472 471 0103 471 0273 471 0473 563 0563 471 0623 471 0394 475 0006 Reference Desig Description Gremlin Part n a Pins 045 sq 3 4 in 212 0002 n a 4001L Logic PC Board 170 0009 n a Connector 10 Pin 212 0005 49 Reference Desig NP PEEP OPEN HONE NONE o I gt m Co R 1 38 R 3 thru 12 14 R 13 27 33 39 R 15 R 16 18 25 34 21 22 R 30 R 31 R 20 24 R 17 19 23 R 26 R 32 PARTS LIST Power Sound Board 4001A PS Description IC LM380N SCR MCR 106 1 SCR 2N5060 Transistor 2N2222A 2N4401 Transistor 2N3565 Diode 1N4002 Diode MR501 Zener MZ500 22 4700mfd 16V 02mfd 50V Cap 05mfd 50V Cap 4 7mfd 16V Cap 100mfd 25V Cap lmfd 16V 250pf 50V Cap 003 50 Cap 820pf 8100 Cap 1800pf 0100 Cap 22mfd G0 35V 001mfd 50V Resistor Resistor Resistor Resistor 27K 1 2W 680 1 2W 10K 1 2W lK 1 2W Resistor 1M 1 2W Resistor 100K 1 2W Resistor 2 2M 1 2W Resistor 220K 1 2W Resist
9. 7408 7410 7442 7448 i x 7474 7475 7490 7493 i 74154 ti 74193 Transistor 2N2222A SCR 2N5060 M MCR 106 1 Diode 1N4002 Lamps 756 1813 Logic Board 4001A DLC Power Supply Board 4001A PS Transmitter 52 2 50 100 each each each each each each each each each each each each each each each each each each each each each The following section describes the 4001B PS Power Sound Board which has succeeded the 4001A PS Power Sound Board and is used only in the Model 4001B PLAY BALL game The circuit description is referenced to drawing no 801 0003 53 POWER SOUND BOARD 4001B PS POWER CONTROL The Power Control Circuitry Power Buss Switching Q 13 through Q 16 operates identical to that described on page 30 BAT SOUND The Bat Sound for the 4001B PS is quite different from that of the 4001A PS The Hit signal is sensed at Pin 2 of the board connector and applied through D8 and R27 to the base of Q 12 Q 12 inverts the incoming pulse and applies it to the base of Q 11 through differentiating capacitor C 18 C 18 detects the leading edge and Q 11 amplifies and squares the resultant narrow pulse The output at the collector of Q 11 a positive pulse is applied to a damped oscillator consisting of the following three stages of 0 1 The pulse shocks the oscillator into a short burst of oscillation which has the frequency and wave s
10. a Single is awarded 1 point If he hits a Foul Ball no points are scored and if he misses the ball completely a Strike is called and his opponent is awarded 1 point When the ball is hit a realistic bat sound is emitted and the lighted electronic ball flies toward the outfield When a Home Run is hit a rousing crowd cheer complete with whistles is sounded A Free Game is awarded when a preselected number of Home Runs are hit during the period of a game This feature may be inhibited for areas where free play is prohibited PLAY BALL is internally programmable The speed of the ball is controlled by a master potentiometer located on the Logic Board Also on the Logic Board is a potentiometer to control the sequencing speed of the Pitch Selection circuitry On the side of the game is a switch by which the players may program the game to either Major League speed or Minor League speed The length of the game is controlled by score The score at which the game ends is internally selectable by means of jumpers provided on the Logic Board The game may be ended on any increment of 10 up through a total of 70 points SYSTEM DESCRIPTION PLAY BALL is a digitally controlled sequentially animated game Digital integrated circuits control the rate interval and sequence of events Figure A is a block diagram of the game The receiver output is applied to an Input Processor which determines whether or not a game is in play t
11. above is conventionally shown as a block diagram with input and output functions designated as shown and it operates as follows Input information is applied at the D input This may be either a HIGH or LOW potential The input is trans ferred to the Q output upon the positive transition of a pulse applied to the clock CK input For instance if a HIGH is applied to the D input and held there no change in the Q output will be noted until a clock pulse is applied to the CK input When the positive edge of the clock pulse occurs the HIGH felt at the input will be transferred to the Q output Any additional clock pulses that occur while the D input remains HIGH will cause no further change However should the D input go to a LOW state the pos itive transition of the next clock pulse will cause the Q output to go LOW The D Flip Flop also has a Q pronounced Q Bar output which simply provides an output that is always the opposite of the Q output Q is HIGH Q will always be LOW and vice versa A D Flip Flop also has two other inputs labeled PRESET and CLEAR These inputs may be used to set the outputs to a desired state With both the PRESET and CLEAR inputs held HIGH the circuit will operate normally LOW is applied to the PRESET input it will cause the Q output to go LOW Conversely if a LOW is applied to the CLEAR input it will cause the Q output to go HIGH It is important to note tha
12. and the LOGIC board Additionally a receiver module is incorp orated to receive and process the signals transmitted from the hand held transmitter control The transmitter controller is a standard tone modulat ed 27 MHz radio transmitter The only control necessary for its operation is the top mounted push button that is actuated to play the game The coin box provided with the game is a Quarter Rejector type that causes a switch contact closure with each coin inserted Each coin activates the circuitry in the main frame and allows a game to be played The game is played in the following manner Two players compete in PLAY BALL each taking turns at the control box that enables them to play from any place in the room A coin is deposited and the game activates allowing the transmitter control box to initiate action The first player watches the scoreboard on which pitch selections are alternating He has a choice of a Fast Ball Curve Slider or Change Up depresses his control box button putting the animated pitcher into action and an electronic ball travels toward the batter Releasing the control box button starts the bat swing Just as in an actual game the player must time his swing to make contact with the ball as it travels across the plate Just how accurately he does so determines what kind of a hit he gets and how many points he scores A Home Run scores 4 points a Triple 3 points a Double 2 points and
13. any other input The counter has a BORROW and CARRY output as well The CARRY output provides a pulse in the count up mode to indicate when full count has been reached Conversely the BORROW output provides a pulse in the count down mode to indicate when 0 has been reached in the countdown Sequence The 74193 has LOAD inputs which allow it to be load ed to any preset state by applying input signals to the 4 inputs and allowing the LOAD input to go HIGH The respective outputs will then assume the signal level of the inputs Count inputs will then cause the counter to Sequency properly from this pre selected configuration Figure 12a is a sequence diagram of a typical CLEAR LOAD and COUNT operation The 74193 is used in the PLAY BALL game in two places where a reverse in count direction is necessary the game counter and the ball flight counter The LOAD inputs are not used in the game The NE555 is properly called a LINEAR integrated cir cuit because not all of its inputs are digital two state 17 levels The 555 is a highly stable controller capable of producing accurate time delays or oscillation Addition al terminals are provided for triggering or resetting if desired In the time delay mode of operation the time is precisely controlled by one external resistor and capacit or For stable operation as an oscillator the free running frequency and the duty cycle are both accurately controlled with two external
14. begins to sequence from count 0 through count 15 When count 15 is reached a pulse is applied from pin 17 of U 41 to pin 3 of U 18 This causes Flip Flip U 18 to toggle The U 12 counter continues to count and the 0 through 15 count sequence is repeated However the same lamps on the game front do not illuminate because as U 18 toggled after the first sequence it changed the Power Control output at connector Pins 85 and 86 Figure 14 illustrates the operation of the POWER CONTROL CIRCUITS The transistors should be assumed to be sequentially turning on and off 1 through 16 If the output from IC 1 is HIGH and Ic 2 and IC 3 are LOW only SCR 1 will be on Thus as the transistors sequence from 1 through 16 only the A lamps in the collector circuits will be illuminated If during the next sequence IC 2 is HIGH and IC 1 and IC 3 are LOW SCR 2 will be on and only the B lamps will be illuminated This is exactly the action that occurs during a ball pitch in the game The first half of the ball trajectory 16 lamps is con trolled by an SCR POWER BUSS When the counter reaches its maximum count of 15 the flip flop U 18 changes the Power Buss when it toggles and the counter repeats its count again This time however a different power buss is energized and the lamps that constitute the last half of the ball pitch trajectory are illuminated completing the Pitch When a HIT is registered the UP DOWN counter 21 VL uui
15. from the Gremlin factory If a problem occurs which cannot be easily resolved a phone call or letter to the factory will bring attention to your problem by a trained representative A spares kit listed elsewhere in this manual is available from the factory It contains items necessary to effect repairs in those areas that would be most likely to need service Integrated circuits transistors and lamps comprise the majority of the spare parts Spare Boards Logic Power Sound and Receiver are available Spare transmitters are also stocked Should the PLAY BALL game fail to operate properly it is always best to check system operation in a logical step by step manner Doing so will many times reveal a rather simple problem that is easily corrected and eliminate time consuming and costly repair attempts on circuit problems that do not exist Some problems that may fall into the above category are included in the following guidelines If a lamp burns out it should never be replaced with anything but the EXACT replacement device The lamps used in this game have been selected for proper voltage and cur rent characteristics Use of anything other than the proper type may cause malfunction and destruction of internal transistor drivers Many instances of damage to the Logic Board and Power supply can be directly attributed to the use of an improper lamp type in the front panel display 33 When replacing any components i
16. of digital integrated circuits of varying complexity all must conform to this limitation their outputs are limited to switching between two voltage levels HIGH and LOW For the purposes of this discussion only TTL Transistor Transistor Logic circuits used in GREMLINs PLAY BALL game will be examined Figure 1 illustrates an integrated circuit containing Six simple inverter circuits Each circuit functions simply to invert the state of the voltage applied to its input If the input is LOW the output will be HIGH Con versely if the input changes to a HIGH state the output will immediately change to a LOW state Thus it inverts the signal applied to the input terminal Inverters are used primarily to invert a signal that is of the wrong polarity to interface with or drive another circuit or device 7408 AND Figure 2 depicts a Quadruple 2 input AND gate the 7408 In operation the output of each gate will go HIGH only if both inputs are HIGH Restated the output will change to a HIGH state only when both input 1 AND input 2 are HIGH It is therefore called an AND gate Consider a typical application If input 1 remains at a LOW state the output will be LOW and any changes at the other input will not affect the output However if input 1 then goes HIGH it will allow the changes at the other input to appear at the output Returning input 1 to the LOW state w
17. GH level is not present when preselected score has been reached Check U 16 pin 11 and U 26 pin 11 for proper output The negative going output from U 25 is differentiated and applied to U 26 which should give a positive pulse approx imately 5 seconds in duration at pin 3 not change 0 26 Positive transition at Pin 11 of U 8 should apply HIGH Level to U 15 Pin 1 which allows Master Clock Signal through to U 14 Pin 14 Pin 11 of U 14 should have signal 1 16th the frequency of the input If no signal change U 14 Check U 13 for normal outputs during count and replace if not present Do the same for U 27 Defects in individual segments of Bat Swing may be repaired by replacing U 49 or U 50 or the associated Drive Transistors 37 If the Hit Gate is present at pin 10 of U 9 check pin 9 of U 9 for proper signal This signal is applied to the respective gates of U 19 and U 20 for routing to the CASEY or LEFTY score circuitry If the game is not scoring at all the problem may be in circuitry prior to U 20 If unit is Scoring but awarding wrong values check U 1 through U 4 I any individual segment of score will not illuminate U 43 through U 46 or their associated transistor drivers may be at fault Check pin 14 of U 53 for HIGH level when a Home Run is hit Diodes D 6 through D 9 should decode the binary output of U 53 The HIGH level appearing at U 52 pin 3 will award the free game a HIGH level is not present
18. NOAVI TL A9YWIOFSUEIL ch jo ol 10 een uroo 0p s s odumr 9914 p eog Tozquoo p ds p eog 0 s oouenbeg p eog 42 Y3LLNSNVXI FAW LZ INOL 379NIS J yoni 211043876 gt 220 e EJ fd ya Ur 012 du c 217 Ir 52 6 67 IMS 43 0710 7724 PHW LE 279V S HV22V WLUW HS POWER CONTROL x ale DOOD uty e 699 PLAY gt BALL lt V LEFTY 13 0 85 9 59 h Gao Y 5 cea e 832 AZ pe 7 GREMLIN PLAY BALL MODEL 4001A 80 y V FREE lt GAME lt 4 45 BAT ANIMATION CROWD NOISE CONN GREMLIN INDUSTRIES INGORPORATED MODEL 4001A LAMP BOARD amp FRAME SCHEMATIC RECEIVER lt Pa FDUL HOME TRIPL DOUBL MES MERE SB Q Q CONNECTOR 87 FION COIN 2 Ec w ii AA
19. OW when the trans mitter button is depressed and Goes back HIGH when the button is released This positive going transition serves to trigger D Flip Flop U 8 When this flip flop latches on Pin 9 goes HIGH and Pin 1 of U 15 follows opening the gate and allowing signal from the master clock to pass to 0 14 Pin 14 0 14 divides the frequency by 16 and passes the resultant lower frequency to U 13 pin 14 0 13 is a 4 bit counter that drives a 10 line decoder U 23 a 7442 The output of U 27 is inverted and 24 applied to the lamp drivers that sequentially illuminate the bat swing When counter U 13 reaches a count of 10 diodes D4 and D5 couple signal to pin 4 of U 15 and Pin 5 receives signal from pin 11 of U 13 When all inputs have reached a HIGH state pin 6 of U 15 goes LOW and resets Flip Flop U 8 at its CLEAR input pin 13 This in turn closes Gate U 15 and stops all input to the counter and the bat swing ceases and returns to its rest position A HIT is registered when the UP DOWN latch U 11 is latched into the HIT mode by applying a LOW pulse to pin 13 of U 11 This causes it to latch with a HIGH at pin 11 and a LOW at pin 8 The LOW at pin 8 turns off the UP gate to counter U 12 and the HIGH at pin 11 of 0 11 opens the DOWN gate and allows the Counter to reverse direction causing the flight of the ball on the display panel to reverse direction The HIGH felt at pin 11 of 0 11 is also coupled to Pins 1 amp 2 of U 17 whic
20. When the pitch sequence has been completed and a HIT has not been registered the following occurs to register a STRIKE Pin 6 of U 8 goes negative at the time of pitch initi ation and stays LOW throughout the pitch sequence At the end of the pitch sequence pin 6 goes HIGH This is felt at pins 9 and 10 of U 15 which is connected as an inverter Pin 8 of U 15 thereupon goes LOW The leading edge of this negative transition is differentiated by capacitor C 4 and this differentiated pulse serves to trigger U 31 an NE555 connected as a one shot multivibrator This pulse causes pin 3 of U 31 to go HIGH and remain there until the circuit times out approximately 3 seconds The positive pulse is also applied to pin l of U 10 Pin 2 of U 10 is also HIGH when no hit has been registered so the pulse is allowed through the gate and turns on Silicon Controlled Rectifier SCR 1 which lights the front panel display STRIKE When Timer U 31 times out and pin 3 goes back to a LOW condition the negative transition is differentiated by capacitor C 6 and applied to pin 1 of U 6 resetting that Flip Flop This in turn re opens gate U 24 and the pitch nomenclature begins alternation again Additionally the negative transition that occurs at pin 5 of U 6 is differentiated by capacitor C 12 and applied to pin 9 of 0 11 This assures that the UP DOWN Latch is set in the UP mode and is ready for the next pitch Input Processor U 6 Pin 9 goes L
21. a free game 3 change in the pitch select sequencing speed and 4 change in the Master Game Speed which controls pitch and bat speed The score necessary to end the game is selected by means of jumpers located on the Logic Board shown in figure 16 The game is normally shipped with the end of game score set to 30 points This may be changed at any time however by simply changing the jumpers on the Logic Board as follows Game ends at 20 Jumpers installed Jl amp J4 30 71 92 J3 4 40 J5 amp J6 50 J2 J3 J5 amp J6 60 Jl J4 J5 amp J6 Jumpers may be changed at the output of U 53 to control the number of Home Runs necessary for a Free Game The board is marked with the output BCD code 1 2 4 amp 8 as shown in figure 17 Home runs for free game 1 Jumper installed at amp 2 amp 1 8 8 8 4 261 4 amp 2 4 amp 1 4 0 9 8 7 6 5 4 From the above it can seen that it is necessary to simply install jumpers at the terminals intil their BCD total adds up to the desired number To inhibit free games remove all jumpers from free game circuit Potentiometer R 34 located at the upper left hand corner of the Logic Board controls Pitch Sequence speed The master speed control 11 is located at the lower center of the Logic Board and should be adjusted to the desired speed setting with the MAJOR MINOR LEAGUE switch in the MAJOR LEAGUE position 41 AVIA WWNOVIG L
22. amp 4 E G 9 62 0696 CO 6 69 69 6 69 62 D 9 090 OF e y z POWER SUPPLY 42277 Ze lt P 5 LL 4 L 9 lt MAE 177 1 LEAGUE C e FREE CHANGE FAST MINOR amp De BALL LEAGUE x 4 2 2 9 SWITCH iie m FF FEM RR Sas gt 5 a GND 25 IR S ORE DISPLAY apo i GENERAL Q He ILLUMINA O RT VAC E s NS i inni P WU Li ass 5 E T ESSE uo ERELT Wis mes Ht 10 ANIMATION BLANK HH E ias VOLO 0 G18 1218191916101 eie 6 od gt 9 lt pi 96 gt SOLO DOLL OO AON MBE OSG 45 45 40 49 Gb 5959926 esr EIS 929552929 DDR AY 9 9 LOGIC BOARD CONNECTOR 4 kx 26 CVG NUS 17 01 12395 557740 3 IN NETIN 22 2 OV3U4037IM NI 52707644 201170467 TW 1 LLYM 2 NI S3D7A 301059 770 2 200 N 70019 779 Cj NMOS 9175 10 2 YO V2222N2 SHOLSISNVAL 77 LUvUJOVUVIO 2ePMabUDNWTH 25 zc 22 008 zu 527 Ag 460 00 6 7 7 N 442 EJS 100 200 i Pi 97 29 039 ae 79 12 53 ru Acn H zu
23. at pin 3 change U 53 or a possible defective diode If HIGH level is present at U 52 pin 3 and the game light comes on change U 51 Note Unit will not award free games in minor league Check U 23 pin 14 for signal during Hit Gate Time Pins 2 and 3 should go LOW during this time proper output is not seen at pins 12 through 15 of U 30 change U 23 If any Hit designation is inoperative check U 30 U 22 or SCR s 2 through 6 Master clock frequency should be at pin 2 of U 15 when the transmitter button is depressed Pin 1 of U 15 should go HIGH allowing signal through to pin 14 of U 14 If HIGH level is not at pin 1 of U 15 change 0 8 input to 0 14 is normal but output at pin 11 is not present change U 14 U 13 should provide proper binary drive signal to U 27 See detailed circuit description Problems with individual segments may be caused by defective U 49 or U 50 or any of the associated drive transistors Problem will be associated with U 16 Power Buss drivers located on the logic board or their associated SCR s located on the power sound board U 18 may also be defective Check U 17 pin 6 on the logic board for proper output when ball is hit If a HIGH level is present after a hit 38 check the HIT SCR on the Power supply board It should also be determined that the latch circuit comprised of U 11 is operating properly as it is this circuit that drives U 17 This problem is easily identified by t
24. h inverts it to a LOW at pins 4 amp 5 of U 17 Pin 6 of U 17 then goes HIGH and turns on the HIT power buss on the power supply board Additionally the LOW at Pin 3 of U 17 is also felt at pins 4 and 2 of U 16 which turns off the other power supply busses The LOW pulse at pin 13 of U 11 which started the above sequence originates when both Pin 5 and Pin 4 of U 9 go HIGH This occurs when the bat swing and the pitched ball coincide at a point above home plate Pin 5 of U 9 is connected to pin 4 of U 39 the driver IC for the Ball indicator at home plate Pin 4 of U 9 is con nected to the bat segment in question in the following manner Counter U 13 bat swing counter pins 8 amp 9 both go HIGH on the 6th bat segment during the swing This causes U 16 pin 8 AND Gate to go HIGH and applies this signal to pin 13 of U 10 Pin 12 of U 10 goes high only during the second sequence of the ball pitch assuring that a hit may not be registered during the first count sequence of the pitch counter U 12 U 41 Therefore with pin 12 High during the last half of the pitch sequence when a positive or HIGH pulse appears at pin 13 of U 10 AND Gate it is gated on through and appears at pin 4 of U 9 Thus U 9 pin 5 goes HIGH when a particular ball is selected in the pitch sequence and U 9 pin 4 goes HIGH on the 6th segment of the bat swing If these two pulses are present at the same time pin 6 of U 9 will go LOW and cause the HIT sequence to occ
25. h the pulse shaping network of U 51 and then applied to pin 4 of U 29 the DOWN input of the GAMES COUNTER The output of U 26 is also used to inhibit the receiver input through U 20 pin 12 to U 21 pin 3 The negative signal that results at U 21 pin 3 is applied to U 6 the input processor pin 13 and holds it in the CLEAR mode The signal also goes to U 18 pin 13 to clear the 7474 assuring that when a new game is initiated it will always start with CASEY at bat The output of U 26 pin 3 is also differentiated by C 17 and applied to pins 4 amp 5 of U 25 which puts out a positive pulse at pin 6 that resets all of the Score counters and brings the score back to zero A free game is awarded after a pre selected number of Home Runs is hit during the period of a game This number 28 is selectable from 1 to 16 The Home Run Counter U 53 counts the output from U 10 pin 6 which goes HIGH every time a Home Run is hit When the preselected number is achieved a positive HIGH signal is applied to pin 3 of U 52 a D Flip Flop This triggers the Flip Flop and a LOW output appears at pin 6 This is applied to pin 5 of U 51 and when present inhibits the Game Over signal from proceeding to the Games counter Thus when the game is over it will not step down and another game may be played without depositing another coin 0 25 pin 3 will reset the home run counter just prior to the start of a new game 29 POWER SOUND BOARD
26. hape characteristics similar to that of a bat sound SUMMING AMPLIFER 0 1 Pins 12 13 amp 14 forms an amplifier which combines the bat sound and crowd noise inputs and conditions them to be fed to the volume control potentiometer CROWD NOISE The crowd noise circuitry operates in a manner similar to that described on pages 30 and 31 AUDIO AMPLIFIER U 2 is a self contained 5 watt audio amplifier which processes the sound signals from the volume control and routes them to the speakers 54 0912127295 ISIMAFHLO 597 GILON SUVOUJOJOIA NI SHOWA 201120807 77 1 45 IWH SWHO NI SINTA 2001 51572 TN Z 000 108 5 9 00 77004 325 249 795 0909 NOUS Y IMC 126 V2 097 0 NUS 422 gt OSOL 5319150001 NETW339 ssng 1 20 2219 lt Ere 3 100 1 qi EZEN N a v 122 GE SEJ 992 AS OL a 219100 1177011223 400 pe cg 102 19773 Vg 200 ge 2 0 21 b ano Ea 090532 JWH 090235 e ZOA 087 MLE ua 162 4 15213 viU SSG HALId osa L zo ZONI ggg 052 97 Ni HDLVIIN3HUN UN 2080 L 20 TUIxa E5 onnos 0022 era pew Lra OND 104
27. he games counter has not been activated by the coin box the Input Processor will not allow the receiver output to continue through to activate the game Thus a game cannot be played until a coin is deposited in the coin box If the games counter is not at zero count the input processor allows the receiver input to activate the game action The input from the receiver is normally high approximately 5VDC When the transmitter button is depressed the level goes low ground potential Re leasing the transmitter button again allows the input level to go high When the transmitter button is depressed the falling edge of the receiver output causes the Pitch Select circuitry to stop its alternating action and apply a fixed voltage to the clock circuit This voltage determines the frequency at which the clock oscillator operates The same falling edge of the receiver output starts the ball animation circuitry operating and the ball is pitched at a speed determined by the clock frequency When the transmitter button is released the rising edge of the receiver output signal causes the bat swing circuitry to activate and the animated bat begins to swing If the animated bat and ball coincide in their paths over the plate the Hit Gate senses the coincidence and Scores a hit The accuracy of the coincidence determines which hit is selected by the Hit Select circuit Foul Single Double Triple or Home Run At the same
28. he ball sequence It can be seen that if coincidence is perfect the gate applied at pin 10 of U 9 will allow four pulses of the signal applied at pin 9 to pass Less coincidence will allow fewer perhaps three or two or one to pass These pulses are applied to pin 14 of counter U 23 The counter output is decoded into an in line output and the output triggers the appropriate SCR and lights the proper nomenclature on the game front panel A count of four lights the HOME RUN lamps three lights the TRIPLE lamps two the DOUBLE lamps and a single pulse lights SINGLE If the coincidence pulse is very narrow it may occur while there is no pulse at pin 9 of U 9 and the counter U 23 will not advance from 0 even though the Hit gate will be energized In this instance a foul is registered with U 21 pin 6 going HIGH SCORING The same pulses that are fed into the HIT SELECTION circuitry also are routed to U 19 and depending upon whether CASEY or is at bat a Score of 1 2 3 or 4 will be awarded CASEY is at bat the output of U 9 pin 8 will go through U 19 pin 10 to U 20 pin 2 and thence U 4 pin 14 0 4 is a 7490 Decade Counter which drives a 7448 seven segment docoder U 46 U 46 in turn drives the individual segment driver transistors and illuminates the lamps in the scoreboard U 4 output at pin 11 is fed to U 3 pin 14 another decade counter which counts the sec ond digit of the two d
29. he unique present ation that results at the display panel Prior to starting the pitch a ball located in the first half of the pitch trajectory will be continuously illuminated When the pitch is started the ball will remain illuminated while the animation progresses normally When Power Buss 2 turns on a stationary ball will illuminate and remain lit until the buss turns off If the ball is hit a similar stationary ball will illuminate in the flight path The above is due to a shorted transistor in the Ball Animation circuit Q 1 through Q 16 Because the same transistor is used in association with all three Power Busses see detailed circuit description it is immediately evident when failure occurs Conversely if the transistor is open due for example to an incorrect lamp having been installed in place of the correct number 1813 or 756 The above pattern will be apparent with the exception that the lamps instead of remaining illuminated while the buss is on will fail to light at all 39 9 t by C 52 a t 7 3 t 0 U U U D 3b 35 34333 32 U CUCI E WEIHER FE oJ PECES UP END OF GAME SCORE JUMPER LOCATION FREE GAME FIGURE 17 40 PROGRAMMING AND ADJUSTMENTS FOR GAME The PLAY BALL Game employs means of changing several of the game functions Changes that can be made are 1 change of score at which the game ends 2 change in the number of Home Runs required for
30. icular voltage at pin 5 of U 38 When the transistor turns off and another of the four transistors turns on a different resistor is placed into the divider and the voltage applied to pin 5 changes Thus if the action of sequentially selecting transistors 59 through 62 continues the output frequency of U 38 will change accordingly The switching action at the transistors is controlled by the decoded outputs of U 5 a D type Flip Flop that is connected as a two bit counter Reference to the integrated circuit data will show that there are two independent Flip Flop circuits in a 7474 IC These may be hooked up in such a manner that they will toggle or count When the two flip flop circuits are then connected in series they posses the capability to count or divide by 4 0 5 is connected in such a configuration 0 37 containing four AND gates decodes the counter output into a serial output 0 1 2 3 and applies signal to the switching transistors 59 through 62 previously discussed It should be noted that the counter and decoding Circuits also drive four additional transistors 63 through 66 These transistors operate the lights on the game display Curve Slider Change Up and Fast Ball which are associated with the four ball speeds that may be selected U 47 is the oscillator that controls the rate at which the above changes occur Potentiometer R 34 allows this rate to be internally adjusted The output of U 47 is ap
31. igit score If LEFTY is at bat the same procedure is followed through Pin 13 U 19 to pin 4 of U 20 and into the scoring counters U 2 and U 1 which accumulate LEFTY s score If a HIT is not registered a strike is sensed by the pulse fed into U 19 pins l and 4 This signal originates at U 17 pin ll It may be recalled that the output of the U 17 gate occurred at the end of a pitch sequence when no hit was registered END OF The game is ended when an internally selected score is achieved Pins 3 4 amp 5 of U 48 monitor CASEY s score and can end it on any score increment of 10 Jumpers are provided to select any score from 10 to 70 The game is normally shipped with the score set to end the game at 40 points Pins 9 10 amp ll of U 48 monitor LEFTY s score The output of either of these two gates goes negative when the preselected score is reached Either negative going LOW signal will be routed through the NAND gate U 32 pin 3 and into U 16 pin 12 Pin 13 of U 16 is HIGH only if CASEY is at bat This assures that the game will not end until the second player LEFTY has had his last turn The resultant pulse at 0 16 pin 11 is felt at U 25 11 Capacitor C 14 differentiates the negative going transition of this pulse and triggers the Timer U 26 causing a positive HIGH output from pin 3 of the timer This output pulse which lasts about 5 seconds is fed throug
32. ill again cause the output to go to the LOW state and inhibit any further signals at input 2 from being felt at the output Thus the signal at input 2 has been gated to the output by a signal applied at in put 1 Hence the term GATE The PLAY BALL game uses several circuits of this type to gate signals on and off QUADRUPLE 2 INPUT POSITIVE N7400 GATE SCHEMATIC each gate FIGURE 3 N7410 TRIPLE 3 INPUT POSITIVE NAND GATE SCHEMATIC each gate FIGURE 4 N7A DUAL D TYPE EDGE TRIGGERED 414 FLIP FLOP TRUTH TABLE n 1 1 1 0 20 1 0 1 0 f Both outputs in 1 state n is time prior to clock n 1 is time following clock FIGURE 5 10 Figure 3 illustrates the 7400 Quadruple 2 Input NAND Gate It operates exactly like the AND gate but it performs the added function of inverting the output Therefore when both Input 1 and Input 2 are HIGH the output will go LOW A NAND gate can be thought of as an inverting AND gate Figure 4 shows a Triple Three Input NAND Gate All three inputs of each gate Input 1 AND Input 2 AND Input 3 must go HIGH to obtain a LOW state at the output A LOW at any of the inputs will maintain a HIGH condition at the output D ERIP FL Bn 6cee 4 59 er The circuit shown in Figure 5 is a Dual D Type Edge Triggered Flip Flop It is a relatively complex circuit made up of several of the gates discussed
33. ine is provided which inhibits the count in puts and simultaneously returns the four flip flop outputs to a logical 0 LOW Figure 7a shows the logic truth table associated with the 7493 for a count sequency of 0 through 15 This counter is used primarily for frequency division in the PLAY BALL game BCD TO SEVEN SEGMENT 7448 DECODER DRIVER OUTPUTS NUMERICAL DESIGNATIONS RESULTANT DISPLAYS C AB ss E INPUTS TEST OUTPUT INPUT FIGURE 8 N7415 QUADRUPLE BISTABLE LATCH TRUTH TABLE Each Latch ty bit time before clock pulse thea bit time after clock pulse These voltages are with respect to network ground terminal FIGURE 9 4 LINE TO 16 LINE 741 94 DECODER DEMULTIPLEXER TRUTH TABLE B 9 10 11 12 13 174 15 I LO OXEGCOf ca TT Tor s sat wayk ITXCIIIT TIIICXITIrIrirzrczirg IIIIIIIIIIIIIIIIFC rzr
34. ll toward the batter The above description showed that Gate U 15 pins 11 12 amp 13 was opened when The D Flip Flop was set by the Transmitter initiation Resetting the Flip Flop U 8 is accomplished by applying a LOW input to pin 1 the CLEAR input This Signal is derived as follows Pin 17 of U 41 goes LOW on the count of 15 and this signal is applied to Pins 9 amp 10 of U 17 which is con nected as an inverter The output of U 17 is a positive pulse that is then applied to NAND gate U 17 pin 12 However during the first 16 line sequence of U 41 U 18 is set in a mode that has pin 5 LOW This is also applied to Gate U 17 pin 13 thus holding that gate CLOSED After the first sequence is completed and the counter be gins to repeat the 16 line sequence U 18 is triggered at pin three so that pin 5 goes HIGH Thus when the LOW pulse appears at U 41 pin 17 during the second sequence it will be inverted into a HIGH pulse and applied to pin 12 of U 17 which is now an OPEN gate It will pass through the gate and is applied to pin 10 of U 10 an AND gate It should be remembered here that this neg 23 ative LOW pulse appears only after the second count cycle of U 12 This LOW signal is coupled through the AND gate and applied to U 8 Pin 1 the CLEAR input This resets the Flip Flop and closes the gate at U 15 pin 12 thus inhibiting any further input to the UP DOWN counter and stopping all ball animation
35. n the game always use an exact replacement part All parts have been chosen for optimum circuit performance Transistors and SCR s used to drive lamps have specific current and power character istics which are very important to proper operation and replacement with a device of less capability can result in damage to the component or associated circuitry Operation of the coin box is quite simple Inserting a coin causes a mechanical switch contact closure which causes games to register is important that the correct con nections to the coin box be maintained If any of the three wires that connect the box to the game are connected in anything other than the proper order THE GAMES COUNTER WILL NOT OPERATE PROPERLY may give extra games at erratic intervals not count up not count down or otherwise operate incorrectly If any repairs have been made to the coin box or if the cable has been extended or otherwise modified proper connections must be maintained The transmitter is a battery powered device and the batteries need to be changed occasionally The transmitter contains two 9 volt batteries of the type that are commonly used to power transistor radios When the batteries begin to weaken the range at which the control box will work reliably will shorten Also because of weaker output extraneous signals may cause the game to operate erratically Typically when the signal is weak the bat may swing pre maturely or n
36. nora 00 77408 7041107 JIMI 1 02009 294175 A 09 4 1292 I 2992 reverses its count and sequences the transistors in the opposite direction This would normally cause the ball to retrace the path it had previously used but the POWER CONTROL again takes over and IC 3 turns on Scr 3 and only the C Lamps will illuminate showing the ball arcing into the air after being hit When the transmitter button is depressed the receiver applies a LOW input to pin 12 of U 6 This causes a HIGH to appear at pin 8 and a LOW at pin 9 As pin 8 makes the transition from LOW to HIGH this is sensed at pin 3 of U 8 causing pin 5 of U 8 to go HIGH This is applied to pin 12 of U 15 control gate The other input to the control gate comes from the Master Clock U 38 through U 7 a divide by 16 counter The frequency from this counter is the sequence rate at which the ball will be Stepped in its trajectory The gate U 15 is normally closed but when Pin 12 goes HIGH transmitter button de pressed the gate opens and the signal is allowed to pass into Pins 12 amp 13 of U 9 U 9 is connected to act as a simple inverter and applies the signal to the UP DOWN control 0 11 0 11 is normally in the UP mode so an output is felt at pin 6 of U 11 and applied to pin 5 of U 12 the UP DOWN counter and the pitch is initiated and the input signal steps the ba
37. o short the sockets on the front of the lamp board to each other or to ground as such action will cause possible destruction of components If it has been ascertained that the transmitter and receiver are functioning properly the following checks may be made Check the output of U 38 pin 3 for square wave signal If normal check 0 7 11 for a signal that is 1 16th the frequency of the oscillator no output here change U 7 If U 7 is operating normally check the output of U 15 pin 11 for the same square wave Note The square wave should be at pin 11 only when the pitch sequence is in progress After the completion of a pitch the gate closes and output ceases Refer to detailed circuit description For output to be at pin 11 of 0 15 pin 12 of U 15 must be posititve If pin 12 does not go positive upon pitch initiation check U 8 for proper operation If U 8 is not operating properly check all inputs to it If all are normal change U 8 Improper output from U 6 pin 8 could also cause the problem If all of the above circuits are operating normally and an output is present at U 15 pin 11 check the output at U 9 pin 11 If normal problem must be associated with either U 11 or U 12 If after one pitch has been made the ball will not re turn to the pitchers hand and allow another pitch to be delivered check output of U 8 pin 6 which should go HIGH after the pitch sequence If normal check pin 8 of U 15
38. or 4 7K 1 2W Resistor 680K 1 2W Resistor 6 8K 1 2W 4001A PS Ckt Board Connector 10 Pin Female Connector 4 Pin Male Cap 4 7 MFD 50V 50 Gremlin Part 313 0006 482 0012 482 0009 482 0003 482 0014 482 0002 481 0001 481 0004 481 0005 150 0005 150 0006 151 0001 150 0007 150 0013 150 0008 151 0004 151 0009 152 0007 152 0008 150 0001 151 0008 471 0273 471 0681 471 0103 471 0102 471 0105 471 0104 471 0225 471 0224 471 0472 471 0684 471 0682 170 0008 212 0005 212 0008 150 0002 Reference Desig T1 T2 D 44 D 45 D 1 thru D 43 44 each 124 each 168 each S 1 PARTS LIST Lamp Board and Frame Assembly Description Voltage Regulator LM340T5 Transformer 61122 A Transformer 61219 A Diode MR751 Diode 1N4002 Lamp 756 Lamp 1813 Socket Lamp Switch DPDT Fuseholder Fuse 2A Line Cord Socket 4 Pin Female Coin Box Conn Term Male 10 Pin Potentiometer Resistor 120 OHM 2W Resistor 10 OHM 15W Speaker Latches Frame Receiver Transmitter Hinges P C Board Lamp Board Coin Box 51 Gremlin Part 313 0003 560 0004 560 0005 481 0002 481 0001 390 0004 390 0005 390 0002 510 0004 514 0005 514 0006 600 0002 211 0003 212 0008 475 0007 472 0121 474 0010 130 0005 280 0015 190 0002 190 0001 280 0013 170 0007 220 0001 BALL RECOMMENDED SPARE PARTS FOR PLAY Up to ten units Integrated Circuit 7400 2 7404
39. ot at all the battery is down consid erably the game may not operate at all that is it will not pitch or bat If any of the above conditions exist ALWAYS CHANGE THE BATTERIES IN THE TRANSMITTER BEFORE ANY OTHER ATTEMPTS AT REPAIR ARE MADE The transmitter is also subject to abuse by the game players If the unit is dropped or thrown it is possible that the crystal that controls the frequency has been damaged If this is the case a new unit must be sub stituted or the existing unit repaired The transmitter operation may be checked by placing an oscilloscope at the receiver input to the Logic Board within the game and observing the input level as the trans mitter button is depressed The sianal at this input pin 23 is normally at 5 VDC and goes to ground potential LOW when the receiver is responding to a transmitted 34 signal If this occurs it may then be assumed that the transmitter and receiver are operating normally and that any problems must be elsewhere Check diode rectifiers and transformers for proper output Lamps operate at 12 to 14 volts 11 of the cartoon characters operate on AC voltage provided by the transformer T1 located at the left side of the game viewed from the rear All other animated or electronically switched lamps operate on rectified voltage supplied by the other transformer T2 If a lamp has shorted or any other unusual load is applied to the game the fuse should blow in a sho
40. plied to the U 5 counter through a gate When this gate is OPEN the oscillator output is allowed to proceed to Pin 3 of U 5 However during a game once the ball is pitched the master clock U 38 must not be allowed to continue changing frequency Consequently when the receiver input indicates that the transmitter button has been depressed and U 6 Flip Flop latches pin 5 of U 24 goes LOW and all further oscillator U 47 output is in hibited passing through to the counter The counter there fore stops and a constant DC potential is applied to the master clock The pitch nomenclature on the game front 20 panel also stops changing and indicates the particular pitch that has been selected Once the pitch and play action has been completed a CLEAR pulse is applied to pin 13 of U 6 and the gate U 24 is reopened This causes the oscillator to resume its sequencing action Ball animation is achieved by sequentially energizing a Series of lamps causing an illusion of ball movement as it is pitched and hit during a game This is accom plished by using a 74193 UP DOWN counter and a 74154 4 Line to 16 Line Decoder The 74193 counts 0 through 15 but its output is in BCD form The 74154 converts the BCD into a sequential 16 Line output It would appear that the above would limit the num ber of lamps that could be controlled to 16 in number however such is not the case When counter U 12 begins to count the output from the 74154
41. resistors and one capacitor The circuit may be triggered and reset on falling negative going waveforms and the output structure can source or sink up to 200 ma or drive TTL integrated cir cuits This circuit is used in the game as both a timing device and a controlled oscillator 18 DETAILED CIRCUIT DESCRIPTION The signal from the coin box is applied to pins 65 amp 66 on the logic board A ground is normally held at pin 66 keeping pin 3 of U 24 all IC s are designated as U XX HIGH When a coin is deposited the ground is re moved from input pin 66 and applied at pin 65 which causes pin 3 of U 24 to go LOW This in turn is felt at the Up Count pin 5 input to U 29 an UP DOWN COUNTER The BCD output of U 29 is decoded into 10 line form by U 28 inverted by U 49 and applied to driver transistors 45 through 48 When a single coin is inserted GAME 1 Will light on the display panel More coins will cause additional games to be sequentially illuminated The reset input of U 29 pin 14 is held LOW for normal counter operation However when the game is first turned on a HIGH input is felt at this terminal due to the gate U 32 that is attached to it When power is applied pins 12 amp 13 of U 32 are LOW and Pin 11 is HIGH which holds counter U 29 in RESET As capacitor C 16 charges to a HIGH level the gate output at pin 11 goes LOW and the counter may then operate normally This assures that the counter will alway
42. rmine that it is operating properly as some freight damage can occur within the main frame and not be immediately evident during a cursory visual inspection If damage has occurred during shipment the recipient should immediately file a damage claim with the carrier Filing a claim will protect the recipient from bearing the full cost of any repairs that may arise from the damage Any game or accessory claimed to be defective must be returned to GREMLIN INDUSTRIES INC 7030 Convoy Court San Diego California 92111 trans portation charges prepaid The game will be repair ed and returned to the customer transportation charges prepaid if still within the warranty period If the game is found to be damaged by misuse improper attempts at repair or abuse it will be returned to the customer with transportation and repair charges billed In the instance of a defect of sub assemblies or assemblies manufactured by others than GREMLIN INDUSTRIES every effort will be made to assist the customer in obtaining satisfaction from the original manufacturer PLAY BALL DESCRIPTION The PLAY BALL electronic wall game Model 4001A is a single wall mounted unit that needs only an external coin box and transmitter controller to operate Both of the latter units are supplied with the game Within the main frame of the game assembly is a large 2 5 ft by 5 ft printed circuit board which contains plug in provisions for the POWER SOUND board
43. rt time Check Coin Box as previously discussed If O K check integrated circuit U 29 and U 28 Problem could also be U 24 Check U 47 the sequence oscillator If output is good at pin 3 of 0 47 check U 6 for proper operation 0 24 0 5 or U 37 may also be at fault See the section on Detailed Circuit description for proper operation If a short has developed in any of the lamps that illuminate a particular Pitch Sequence segment Slider Curve Change Up or Fast Ball it is probable that the particular transistor driver Q 63 64 65 or 66 is defective Replaced with type 2N5060 silicon controlled rectifiers in later units It is important to note that whenever the front cover of the game is open and the game is on the operator should be extremely careful with any metal tool that might be used Most of the lamp sockets have power applied to them even if the particular lamp is not illuminated and damage will undoubtably occur if two or more of these sockets are shorted together NEVER SHORT THE LAMP SOCKETS TO EACH OTHER OR TO A POWER BUSS OR GROUND 35 If one of the ball segments in the pitch trajectory stays lighted all of the time it is probably the driver transistor associated with it Changing the transistor will usually eliminate the problem not the 7404 inverter that drives the transistor may be at fault In rare instances U 41 could also be causing the problem Again the operator is cautioned not t
44. s come up on 0 games when power is applied to the circuitry When counter 0 29 is at 0 pin 1 of U 28 applies a LOW to pin l of U 21 an AND gate Pin 3 of U 21 there fore goes LOW and holds the D Flip Flop U 6 in the CLEAR mode until this signal is removed U 6 is the input processor for the receiver signal and when in the CLEAR mode it will not allow any signal to pass Thus a game cannot be played at this time If a coin is insert ed the CLEAR input will go HIGH allowing U 6 to operate normally and a game may be played The ball speed control is comprised of oscillator U 47 a control gate Part of U 24 a one bit counter U 5 decoding gates U 37 and transistors 59 through 66 The master clock oscillator that controls the speed and sequence timing for the game is U 38 an NE555 connect ed as an oscillator Its natural period of oscillation 19 is controlled by capacitor C 1 and the resistance of R 11 and R 12 The NE555 also has an input at pin 5 that allows the frequency to be changed by the application of a DC voltage Changes in voltage at this point will cause changes in the output frequency of U 38 The voltage is changed by the resistive divider that is tied to pin 5 made up of R 5 through R 9 When one of the transistors 59 through 62 is turned on it essentially connects one side of its collector resistor to ground thus establish ing a voltage divider between that resistor and R 9 This yields a part
45. t a LOW input to either the PRESET or CLEAR will override any other input functions 11 7490 DECADE COUNTER T Rom Ro NC fg Pen LOGIC TRUTH TABLES BCD COUNT SEQUENCE See Note 1 RESET COUNT See Note 2 RESET INPUTS OUTPUT OUTPUT NOTES Ro 2 1 Output A connected to input 1 0 BO for BCD count X indicates that either a logi cal 1 of alogical O may be pre sent Fanout from output A to in put BO and to 10 additional Series 54 74 loads is permitted oO0 2 2 0000 oo 00 00 1 x 0 x 0 FIGURE 6 N7493 4 BIT BINARY COUNTER TRUTH TABLE See Notes 1 and 2 OUTPUT NOTES 1 Output A connected to input B 2 To reset all outputs to logical 0 both and Rg 2 inputs must be at logical 1 w gt oooooooolo o o0o0o o0lo o 0o o0o o0 0 1 2 3 4 5 6 7 8 FIGURE 7 12 It should also be noted that clock triggering occurs on the positive going transition of the clock pulse Thus the 7474 is called an edge triggered Flip Flop Trig gering occurs at a voltage level of the clock pulse and is not directly related to the transition time of the positive going pulse After the clock input threshold voltage has been passed the data input D is locked out and any change in the D input after that time will not affect the outp
46. th the jumper in place between the points marked a and b on the circuit board the speed of the game is reduced by a factor of approximately 50 times With the game operating this slowly it is very much easier to trace problems and troubleshoot the circuit ry Two main pieces of equipment are desirable when servicing the circuitry a volt ohmeter and an oscilloscope The following section on MAINTENANCE PROCEDURES assumes the use of these two instruments While it is possible to troubleshoot the game with out the oscilloscope especially when in the service mode it is not a recommended procedure When in the SERVICE MODE it is possible to monitor the changing logic levels using a voltmeter or other voltage sensing device but these instruments will not show any high frequency irregularities that might be causing a problem Before any attempt is made to troubleshoot the circuitry of the game it is recommended that the section of this manual entitled DETAILED CIRCUIT DESCRIPTION be read thoroughly 32 MAINTENANCE PROCEDURES The PLAY BALL wall game has been designed to be a reliable and easily maintained unit It employs very little point to point wiring with most interconnections being made using printed circuit paths If service becomes necessary both the Power Sound Board and the Logic Board are easily removed by simply unplugging them Spare Boards may then be substituted if desired Technical help is available
47. time the Hit gate determines how many points to award to the player The Casey Lefty Select circuit switches between the two players alternately and awards the points to the proper player The Free Game circuit is energized after a specific number of home runs is hit during a game Should that number be reached the circuit inhibits the games counter and at game end a free game is awarded The End of Game circuit monitors the score and when predetermined score which is internally selectable is achieved the games counter is stepped down one count and the game is ended the games counter is then at zero count no further play is possible However if more than one game was registered it simply steps down to the next game and after a short delay the score is reset to zero and the next game is started SIMPLIFIED BLOCK DIAGRAM Free Game Counter Hit Select Pitch Select Receiver Games Counter FIGURE A 7404 INVERTER each inverter FIGURE 1 QUADRUPLE 2 INPUT N7408 POSITIVE AND GATES SCHEMATIC each gate Va O FIGURE 2 INTEGRATED CIRCUIT CHARACTERISTICS GENERAL Digital integrated circuits possess a unique characteristic in that their outputs can assume only two states They are either HIGH output at a positive volt age level or LOW output at or near ground potential While there are many types
48. trol R 36 and applied to an integrated circuit audio amplifier The amplifier output at pin 8 is connected to an external speaker through C 22 The audio is gated on with application of a HIGH level pulse at input terminal 33 on the Power Sound Board This signal saturates Q 14 which turns Q 15 off and allows a positive voltage potential to build up at Q 15 collector This voltage is applied to the collector of Q 13 through R 33 activating this circuit The voltage is also applied to Diode D 11 through R 20 causing it to become forward biased and allow the noise signal to be felt at the base of Q 13 30 The Whistle that accompanies the crowd noise is generated by oscillator Q 10 and Q 11 This circuit is normally biased such that it does not oscillate However when the collector of Q 14 goes LOW the voltage change at the anode of Diode D 12 causes the circuit Q 10 and Q 11 to oscillate for a short period of time When the collector of Q 14 returns to the HIGH state at the end of the Home Run gate the bias change again causes a short period of oscillation generating the second whistle 31 MAINTENANCE PLAY BALL has been designed to simplify in so far as is possible the maintenance and repair pro cedures necessary to get the game back on line as rapidly as possible A unique feature of the game is the incorpor ation of a SERVICE MODE OF OPERATION that may be initiated by the use of a jumper on the Logic Board Wi
49. ur 25 INPUT INPUT 8 GATE TYPICAL WAVEFORMS PRESENT 9 Figure 15 26 Figure 15 illustrates the signal at pin 6 of U 9 that occurs when a hit is registered Several conditions are shown illustrating that the output pulse width is depend ent upon the timing with which the two inputs to the gate are applied If the two input pulses are co incident only at the pulse edges a narrow width pulse is Obtained and if there is no coincidence there will obviously not be an output It is the width of the pulse which occurs at pin 6 of U 9 that determines what type of hit is obtained Perfect coincidence scores a HOME RUN Less perfect coincidence will result in a narrower pulse and score a TRIPLE A DOUBLE results from an even narrower pulse and a SINGLE occurs when coincidence is only about 25 there is a very narrow pulse that occurs at the very edges of coin cidence a FOUL is displayed Circuit operation is as follows The negative going LOW gate is applied to pins 1 amp 2 of U 9 which is connected as a simple inverter The positive pulse that results at pin 3 is applied to pin 10 of U 9 and opens this NAND gate allowing the signal that is felt at pin 9 to be routed through The signal at pin 9 is at a frequency that is 4 times higher than the ball and bat sequencing frequency Therefore there are 4 pulses that may fit into the same time frame that is occupied by one pulse of t
50. uts until the next positive going transition of the clock pulse Figure 6 illustrates a a 7490 decade counter which is a circuit composed of several internally connected Flip Flop circuits They are connected in a manner that allows division of the input signal frequency by a factor of 10 In addition the state of the count is provided at four digital output pins which are the outputs of the four internal flip flop circuits Figure 6a shows the output configuration of these four output pins as the number of input pulses applied goes from one to ten These four outputs provide Binary Coded Decimal BCD information which may be decoded by addition al circuits for display as numbers or sequential events The 7490 counter has gated direct reset lines which inhibit all count inputs and returns all outputs to a LOW Logical 0 state Pins 1 amp 2 on the IC Additional re set lines are provided at pins 6 amp 7 which will preset the counter to a BCD 9 count for certain applications With both reset circuits Pins 1 2 6 and 7 held LOW the counter will count normally Figure 7 iliustrates the 7493 This circuit is simil ar in operation to the 7490 decade counter except that it has a count capability of 16 That is it will divide the input frequency by 16 and provice a BCD output to indicate the state of count The 7493 consists of four internally connected Flip Flops which provide proper count capability A gated direct reset l
51. which should go LOW at the same time If this is normal observe the output of U 31 pin 5 for a HIGH pulse that lasts for about 3 seconds after each pitch is made If not change 0 31 If all of the above is normal check that the differen 36 tiated pulse from the negative edge of the U 31 output is causing U 6 to change states Observe the U 6 output at either pin 5 or 6 HIT CIRCUIT NOT WORKING Check U 9 pin 6 for a negative pulse to occur when ever a hit should be registered There should occur a negative pulse if bat and ball co incidence has been achieved If no pulse is present check at pin 5 of U 9 for the positive pulse that results from the ball segment If this is not present change U 39 or U 9 If it is present check pin 4 of U 9 for a positive pulse resulting from the bat segment If the pulse is not present at pin 4 of U 9 check pin 13 of U 10 If the pulse is present here check to see that pin 12 of U 10 is positive during the second half of the pitch see DETAILED CIRCUIT DESCRIPTION If Pin 12 is positive change U 10 If there was no positive pulse at pin 13 of U 10 check the two inputs at U 16 pins 9 amp 10 If normal change U 16 If all other areas of the game are operating properly change U 18 Check U 48 pin 6 and U 48 pin 8 for negative transition when preselected score is achieved If not change U 48 If normal check U 32 pin 3 and change if HI
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