Play Meter

logic board board takes takes the the two two steering steering logic signals, and anduses usesthem themto to give give board signals, board theoutput outputdoesn't doesn'tchange, change,I.1 LED. IfIfthe LED. replace the the photo-transistor. photo-transistor. The The replace information. information. sionally; so so I I usually usually perform perform aa sionally; of turn turn the car car direction direction and and rate rate of the Before making making aa power-on power-on test, test, Before examine the the steering steering board. board. Look Look examine carefully for for dirt dirt in in the the slots slots of of the the carefully photo-transistor mount. mount. Also, Also, photo-transistor check the alignment of the LED. check the alignment of the LED. The beam beam is is very very narrow narrow and and ifif the the The LED isn't pointing directly at the LED isn't pointing directly at the photo-transistor, erratic operation photo-transistor, erratic operation result. can result. can Power the the board board by by using using the the Power connectorin in the the game, game, or or connect connect aa connector five-volt power power source source to to the the five-volt steering board by clip leads. The steering board by clip leads. The connections are are marked marked on on the the connections board, +5V +5V and and GND. GND. The The output output board, of each each channel channel can can be be read read at at test test of points 1and2 respectively. A VOM, points 1 and 2 respectively. A VOM, probe or oroscilloscope oscilloscopecan can all all be be logicprobe logic used with with equal equal results. results. With With the the used light uninterrupted, uninterrupted, the the test test point point light should show a logic low or less than should show a logic low or less than 0.8 volts. volts. This This will will typically typically be be less less 0.8 than 0.3 0.3 volts. volts. than When aa piece piece of of opaque opaque material material When is placed between the LED and the the is placed between the LED and photo-transistor, the test point will photo-transistor, the test point will show aa logic logic higher higher or or greater greater than than show volts. A typical output is close 2.4 2.4 volts. A typical output is close toVcc Vee or orabout about 55volts. volts. Interrupting Interrupting to will also also cause cause the the the beam beam will the corresponding red LED to be be to corresponding red LED illuminated on on the the logic logic board. board. illuminated Once we we know know which which channel channel is is Once we have to find the defective bad bad we have to find the defective part. Since Since there there are are only only three three part. active components components in in each each channel, channel, active it's pretty pretty easy easy to to locate locate the the it's offending member. The most The most offending member. common failure failure is is the the LED. LED. The The common LED isis energized energized whenever whenever the the LED is turned on so it puts in a lot game game is turned on so it puts in a lot of overtime. Because the LED emits of overtime. Because the LED emits infraredlight, light, you you cannot cannot see see ifif it'S it'S infrared Once we we know know which which channel channel Once is bad we have to find the defective is bad we have to find the defective part. Since Since there there are are only only three three part. active components components in in each each channel, channel, active it's pretty pretty easy easy to to locate locate the the it's offending member. The most The most offending member. common failure failure isis the the LED. LED. The The common LED is is energized energized whenever whenever the the LED game is turned on so it puts in a lot game is turned on so it puts in a lot of overtime. Because the LED emits of overtime. Because the LED emits infrared light, light, you you cannot cannot see see ifif it's it's infrared working or or not. not. When When I I suspect suspect aa working LED (i.e., (i.e., the the red red light light on on the the bad LED bad logic board stays on or the output of logic board stays on or the output of the steering board shows a logic the steering board shows a logic high all all the the time), time), II try try to to turn turn the the high photo-transistor on by touching my photo-transistor on by touching my finger between the collector and finger between the collector and base. (See (See figure figure 3). 3). IfIf the the output output base. changes (goes (goes low), low), I I repl replace the changes eplace the CALENDAR August5-7 5-7 August North Carolina Coin Operators North Carolina Coin Operators Assn. , Inc., Inc., annual annual meeting. meeting. Assn., Radisson Hotel, Hotel, Charlotte, Charlotte, NC. NC. Radisson amplifier transistor transistor fails fails only only occaoccaamplifier as aa last last step step front-to-backratio ratiotest test as front-to-back (see Play PlayMeter's Meters service service issue, issue, July July (see 77, for for this this method method of of testing testing '77, September 16-18 16-18 September Florida Amusement Merchandising Florida Amusement Merchandising annual convention convention and and Association, annual Association, Deauville Hotel, Hotel, Miami, Miami, trade show. show. Deauville trade FL. FL. transistors). transistors). AUTHOR'S NOTE: NOTE: In In the the Business Business AUTHOR'S of game repair, it's important to of game repair, it's important to locate and and eliminate eliminate the the problem problem as as locate quickly as as possible. possible. Downtime Downtime can can quickly cost plenty when your ace game cost plenty when your ace game eats itit on on the the weekend. weekend. eats September17-18 17-18 September Wisconsin Music Music Merchants Merchants AssoAssoWisconsin ciation, annual meeting . Hilton Inn, ciation, annual meeting. Hilton Inn, Eau Claire, WI. Eau Claire, WI. The The foregoing discussion discussion outlines outlines an an foregoing way to to diagnose diagnose and ahd repair repair the the easy way easy without having having any any steering board board without steering knowledge of of solid-state solid-state specialized knowledge specialized theory. theory. staff at at Play Play Meter Meter welcomes welcomes The staff The any suggestions, comments, tips, any suggestions, comments, tips, September22-24 22-24 September West Virginia Virginia Music Music and and Vending Vending West Association, annual convention, Association, annual convention, Motor Inn, Inn, CharlesCharlesHeart-0-Town Motor Heart-O-Town ton, WV. WV. ton, hints, or or questions. questions. Address Address your your hints, letter to: to: letter Technical Editor Editor The Technical The :i i 1li September 29-October 29-0ctober 11 September Music Operators of Virginia, Virginia, annual annual Music Operators of convention, Hyatt House, Richconvention, Hyatt House, Richmond, VA. VA. mond, PlayMeter MeterMagazine Magazine Play 4136 Washington Ave. 4136 Washington Ave. Orleans, La . 70184 New New Orleans, La. 70184 THE PHOTO-TRANSISTORCAN PHOTO-TRAl\lS1STOfi CAN BE BE THE tNERGIZEO BY e,y TOUCHING TOU~~N~ THE \Hf:: BASE B~~E AND A.iD ENERGIZED COLLECTOR WITH YOUR FINGER. IF co~\5uf1'G~ x.'JE~~~ ~~N~~G~E P~OTOTHE OUTPUT DOESN'T CHANGE THE PHOTO:mANSISTO~ ~R FOLLO NG AMPLlF1ER TRANSISTOR OR FOLLOWING AMPLIFIER TRANSISTOR IS IS PROBABLY PRC8A LY DEFECTIVE. DEFECTIVE. TRANSISTOR { FU3URE 3 3 FIGURE 0 PI ,.,,,-(2) ( 1) & = (2) 'II ,," ii '1 ,,:1 ''-'-(10) =2 (10) O Q3 Q CRI 0 l CR2 RJ 7-752 -75 5 RS 470 s 470.2 RB 24 R3 -3.3K RT 3643 04 Test Point 1 470 12 R2 -47052 2N CZ -3.3K 2N CI 3643 /Q2 Test Point 2 FIGURE 44 FIGURE RG