Gottlieb System 80 boards optional LED's

[Ken Layton]

I did a write-up (with pictures) on how to install power and firing LED indicators on the Gottlieb system 80 pop bumper driver boards:

http://forums.arcade-museum.com/showthread.php?t=197641

You'll need to be a registered member in order to view the pictures.

[Ken Layton]

When the pop bumper driver board is in the machine and you're not sure the board is getting power, it's a real pain to stick your meter leads into the connector to measure if there's 5 volts on the board while trying to hold/balance/prop the playfield. Having the green LED on the board lit up will instantly tell you at a glance the board is getting power. The LED's are great for "in-machine" testing.

Say you're troubleshooting a non-functioning pop bumper that appears to be "dead" when you close the spoon switch. The yellow LED on the board will flash once each time you close the spoon switch. This indicates three things have occurred:

1. The board has received a valid switch closure signal from the pop bumper's spoon switch.

2. The board has turned on the pop bumper driver transistor.

3. The coil operating voltage (pulse) has been sent to the coil and the coil should move.

So if the yellow LED flashes and the coil does not move, then you have either a bad coil (open circuit) or the wiring between the pop bumper driver board and the coil is bad (open wire).

[Ken Layton]

I have now added power indicator LED's to these Gottlieb System 80 boards:

CPU board

Driver board

Auxilliary Lamp Driver board

Sound/Speech Power Supply board

Writeup and pictures here:

http://forums.arcade-museum.com/showthread.php?t=202496

The sound/speech power supply got 4 LED's to indicate the presence of +12v, -12v, +30v going out of the board and +24v coming in to the board.

Attached is a picture of the finished boards installed in a Haunted House machine. The LED's I installed are circled.

[Ken Layton]

Now posted instructions for adding LED's to the various System 80 circuit boards in the System 80 section at pinwiki:

http://www.pinwiki.com/wiki/index.php?title=Gottlieb_System_80

[Ken Layton]

Now I have added a +60 volts DC indicator LED to the System 80/80A power supply board. Instructions and pictures are now posted at pinwiki at this link:

http://www.pinwiki.com/wiki/index.php?title=Gottlieb_System_80#System_80.2F80A_Power_Supply_Board_LED