KenLayton
In Memoriam
The Gottlieb System 80 Pop Bumper Driver Boards were a great idea but lack any diagnostic aids like LED's. In this thread I will show you how to modify and install diagnostic LED's for indicating "+5 volts present" and "coil fired pulse". Any color LED's can be used, but I like to use green for indicating the +5 volts and yellow for indicating the coil fired pulse.
Parts needed per board:
1 Green Led, Jameco Electronics # 2125296 (9 cents each) or Radio Shack # 276-022 ($1.69 for a 2 pack)
1 Yellow Led, Jameco Electronics # 2125288 (9 cents each) or Radio Shack # 276-021 ($1.69 for a 2 pack)
1 Diode, type 1N4004, Radio Shack # 276-1103 ($1.19 for a 2 pack)
2 Resistors, 330 ohm, quarter watt, Radio Shack # 271-1315 ($1.19 for a 5 pack)
1 Length of insulated wire (small gauge like 22) about 2 inches long
The first step is to clean/dust off the board on both the component and the solder side. Now, looking at the attached pictures, you will be drilling a total of four 1/16" diameter holes spaced about 3 mm apart for the leads of the LED's to pass through. The red circled area on the solder side is where the holes are to be drilled. I use a Dremel battery operated tool with the smallest collet to hold the tiny drill bit. Be sure to use some sharp tool like an awl or ice pick to make a tiny indentation on your marked holes to keep the drill bit from wandering.
Parts needed per board:
1 Green Led, Jameco Electronics # 2125296 (9 cents each) or Radio Shack # 276-022 ($1.69 for a 2 pack)
1 Yellow Led, Jameco Electronics # 2125288 (9 cents each) or Radio Shack # 276-021 ($1.69 for a 2 pack)
1 Diode, type 1N4004, Radio Shack # 276-1103 ($1.19 for a 2 pack)
2 Resistors, 330 ohm, quarter watt, Radio Shack # 271-1315 ($1.19 for a 5 pack)
1 Length of insulated wire (small gauge like 22) about 2 inches long
The first step is to clean/dust off the board on both the component and the solder side. Now, looking at the attached pictures, you will be drilling a total of four 1/16" diameter holes spaced about 3 mm apart for the leads of the LED's to pass through. The red circled area on the solder side is where the holes are to be drilled. I use a Dremel battery operated tool with the smallest collet to hold the tiny drill bit. Be sure to use some sharp tool like an awl or ice pick to make a tiny indentation on your marked holes to keep the drill bit from wandering.
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