Play Meter

I TestPoints Points Test 12pin pininput inputconnector connector 12 video input input 1.1.video 3 . 5-volt 5-volt supply supply ground ground 3. 4 . audio audio input input 4. 5 . speaker speaker out out 5. 6 . +5 + 5 volts volts DC DC supply supply (used (used to to 6. power the logic PCB in some power the logic PCB in some games) s) game earth ground ground 7.7 . earth 8 . speaker speaker out out 8. 9 . 110-volt 110-volt AC AC neutral neutral 9. 10 . 110-volt 110-volt AC AC hot hot 10. 11. (not (not generally generally used) used) 11. 12 . ++10.8 10.8 volts volts DC DC 12. VERT VERT LIN SIZE -0 73V ADV 1 FLYBACK 1101112. HORIZ SET SET 't 0 llOl\l'Z. HORIZ 5 011T OUT FOCUS CONTRAST 81\l&NT BRIGHT Monitor Circuit Circuit Board Board Component Component Location Location Monitor REO ADJ 731' 73 V- 150V-5 * 0 10 550%-524 GROUND 3v v30 CJ 00 0000000 What , you you might might ask, ask, isis sync? sync? What, is made up of of Well , a video picture Well, a video picture is made up well defined defined spots spots along along the the lines lines of of well company of of the raster, raster , sort sort of of like like aa company the Our mamamarines marching marching along. along . Our marines all march march to to the the same same cadence cadence rines all rines stay inin formation. formation . IfIf some some of of the the toto stay columns marched faster or slower columns marched faster or slower than others, others, the the formation formation would would than many potabecome distorted (and become distorted (and many pota- Likewise, if all the lines in the raster don't start start at at the the same same point point our our don't picture gets distorted . Whew!!! picture gets distorted. Whew !! In aa loss loss of of sync, sync, the the video video image image In will be there but it won't be steady, will be there but it won't be steady, it'll probably probably be be skewed skewed at at an an and it'll and angle . If this is the case , look for angle. If this is the case, look for aa of the the ground ground between between PCB PCB and and loss of loss the monitor input . the monitor input. video ground ground 2.2 . video 0 00000000 poor connection. No sync: sync: No toes would would get get peeled, peeled , no no doubt). doubt) . toes Likewise, if all the lines in the raster 5 \ Dark Screen: Screen : Dark 1. Turn brightness all allthe the way way up. up. IfIf 1. Turn brightness raster appears, appears, see see above. above. IfIf not, not, raster 2 .Look Lookatatthe the filament filament inin the the neck neck of of 2. it's lit. lit. the picture picture tube tube to to see see ifif it's the 3. IfIf the the neck neck of of the the tube tube isis lit, lit, listen listen 3. for the the high-pitched high-pitched sound sound of of the the for flyback transformer, if you can hear flyback transformer, if you can hear thathigh. high .IfIfyou youcan't can'thear hearthat that high, high , that listen for the "static electricity" sound listen for the "static electricity" sound first turned turned on. on . Try Try gently gently when it's it's first when tapping the flyback with an insulated tapping the flyback with an insulated object. IfIf tapping tapping itit causes causes anything anything object. to happen , look for loose wires to happen, look for loose wires underneath the the flyback. flyback . Make Make sure sure underneath you turn the unit off first. Very high you turn the unit off first. Very high voltage, y'know. y'know . (Be (Be sure sure some some voltage, models derive their filament voltage models derive their filament voltage from the the flyback.) flyback.) from not lit, lit, check checkthe the the filament filament isis not 4.4 .IfIfthe normal stuff: stuff:AC AC line line fuses, fuses, monitor monitor normal fuses , power power connectors. connectors . Check Check for for fuses, 110 volts volts AC AC between between pins pins 99 and and 10 10 110 the input input connector. connector. ofofthe monitorfuse fuse isisblown, blown, go goahead ahead 5.5 .IfIfmonitor andinsert insert aa new new one one (or (or new new ones), ones), and andififthe thenew new one one blows blowstoo, too , pull pullthe the and monitor and and look lookfor for loose loose hardware hardware monitor and for for blown blown parts, parts, especially especially in in the the and power supply section or the horipower supply section or the horizontal output output transistor transistor (It (It shorts) shorts). zontal . Horizontal or or vertical vertical line line only: only: Horizontal Checkthe theyoke yokewires wires (the (the yoke yoke isis 1.1. Check the "coils "coils of of wire" wire" thing thing around around the the the neck of of the the picture picture tube). tube). neck lights Note: the the high high voltage voltage that that lights 2.2 . Note: the screen screen isis generated generated in in the the the horizontal circuits circuits so, so, ifif the the hoizontal hoizontal horizontal section goes goes bad, bad, the the screen screen will will not not section light. The vertical section can fail and light. The vertical section can fail and still light light the the screen screen though. though . still Picture wrong wrong size size and/ and /or or distorted: distorted : Picture 1. Usually these problems are result 1. Usually these problems are aaresult the 73-volt 73-volt supply supply of failure failure inin the of (100-voltinin TEC TEC monitors). monitors) . See See test test (100-volt points . points. Small picture picture usually usually means means low low 2.2 . Small voltage and and vice vice versa: versa: try try the the voltage adjustment . adjustment. Most of of these these regulator regulator circuits circuits 3.3 . Most start with a 20 to 30 percent higher start with a 20 to 30 percent higher input voltage voltage than than the the desired desired input output. So So ififyour your 73-volt 73-volt line line shows shows output. 100volts volts (the (the regulator regulator input), input), about 100 about chances are are the the regulator regulator transistor transistor chances has shorted. shorted . has 4 . IfIf the the voltage voltage isis close close or or even even aa 4. and you you have have aa rolling rollingbar bar little low, low,and little on the screen, you likely have effect effect on the screen, you likely have failure in in the the filter filter capacitor. capacitor . Look Look aa failure for leaking white goop or even just for leaking white goop or even just aa poor connection . 0 0 0 c 0 VIDEO VIDEO Ill IN 1 VERT SIZE VERT LIN MonitorPanel-Component Panel-Component Side Side Monitor L1 L1 HOf\12 HORIZ 'ET SET T3Y 4 A273