Post by kcamrac on Jan 18, 2016 12:48:36 GMT -5
Hello. Has anyone have any advice how to resolve the following issues that I am experiencing with my '83 Chexx game:
1.> I had to replace the original scoreboard with the aftermarket one sold on ebay by "bostonpinballcompany" . I am also using their aftermarket ribbon cable since it is keyed to prevent incorrect installation. When I connected the scoreboard (making sure the pins were correct) and turned on the machine, the scoreboard lit up briefly and then immediately blew the octal buffer (similar to if I had connected the ribbon cable backwards) . I checked the voltage of pin 8 on the Moog motherboard and it shows a solid 5vDC . I then checked pins 2 and 3. Pin 2 registered -14vDV and pin3 +15vDC . Those voltages seemed a bit high compared to the schematic. My question is, does anyone know what could be causing the scoreboard blowout, or anywhere else I should be checking voltages?
2.> no matter what I set the "cost" switch to, it only takes one flip of a coin switch to immediately start a game. Looking at the schematic I see that C11 is in line with the coin switch. Looking at the board I can see that there is "new work" on C11 and R29 . Looking at the schematic it looks like C11 is rated at 1uF , can someone confirm that is in fact supposed to be 1uF and not 10uF ? Also, I have looked extensively at the schematic and cannot find R29 anywhere. Does anyone have the resistor value for that? At a minimum could someone post a photo of their Moog motherboard highlighting those components in a manner their values are visible?
Any help is greatly appreciated. The two issues above are the only things holding me back from a fully 100% restored '83 Chexx machine.
1.> I had to replace the original scoreboard with the aftermarket one sold on ebay by "bostonpinballcompany" . I am also using their aftermarket ribbon cable since it is keyed to prevent incorrect installation. When I connected the scoreboard (making sure the pins were correct) and turned on the machine, the scoreboard lit up briefly and then immediately blew the octal buffer (similar to if I had connected the ribbon cable backwards) . I checked the voltage of pin 8 on the Moog motherboard and it shows a solid 5vDC . I then checked pins 2 and 3. Pin 2 registered -14vDV and pin3 +15vDC . Those voltages seemed a bit high compared to the schematic. My question is, does anyone know what could be causing the scoreboard blowout, or anywhere else I should be checking voltages?
2.> no matter what I set the "cost" switch to, it only takes one flip of a coin switch to immediately start a game. Looking at the schematic I see that C11 is in line with the coin switch. Looking at the board I can see that there is "new work" on C11 and R29 . Looking at the schematic it looks like C11 is rated at 1uF , can someone confirm that is in fact supposed to be 1uF and not 10uF ? Also, I have looked extensively at the schematic and cannot find R29 anywhere. Does anyone have the resistor value for that? At a minimum could someone post a photo of their Moog motherboard highlighting those components in a manner their values are visible?
Any help is greatly appreciated. The two issues above are the only things holding me back from a fully 100% restored '83 Chexx machine.
