Adding LED's to Gottlieb System 80 boards

[KenLayton]

How to add a "+ 5 volt" indicator for the Gottlieb System 80 Generation 1 CPU board (the D102 board). This will light up when + 5 volts are present on the CPU board.

Materials needed:

1 Red LED, Jameco # 2125309 or Radio Shack # 276-209

1 Resistor, 330 ohms, quarter watt, Radio Shack # 271-1315

Drill two 1/16" diameter holes spaced about 3mm apart in the spot indicated just below power connector J1. This area has no traces to interfere with drilling.

Install LED into board with flat side facing toward the power connector J1.

Bend the flat side's lead to the negative (ground) point shown in the picture and solder it.

The other lead of the LED will connect to one side of the 330 ohm resistor. The other end of the resistor will be soldered to the positive trace shown in the picture. You're done.

Now whenever the machine is powered on, this LED will indicate that the CPU board is receiving +5 volts from the power supply.

 

[KenLayton]

Driver board LED

Adding a "+5 volt" indicator to the System 80 Driver Board.

Materials needed:

1 Red LED, Jameco # 2125309 or Radio Shack # 276-209

1 Resistor, 330 ohm quarter watt, Radio Shack # 271-1315

Drill two 1/16" holes spaced about 3mm apart in the board at the location shown in the pictures to the left of the electrolytic capacitor near chip Z1. There should be no traces at that area.

Install the red LED with the flat side facing the trace going to the negative side of the electrolytic capacitor. Bend the LED's flat side lead down to that trace and scrape away some of the green paint at the point you will be soldering it. Now solder that lead to the trace.

Solder one end of the 330 ohm resistor to the other lead of the LED.

The other end of the resistor will now get soldered to the trace that goes to the positive side of the electrolytic capacitor. Again, be sure to scrape some of the green paint off of the trace where the resistor lead will be soldered. You are done.

Now whenever the machine is on, the LED will be lit indicating that the driver board is receiving +5 volts from the CPU board.

 

[Sprout]

Very nice mod's Ken - always good to know your 5v line is good at a glance!

 

[G-P-E]

Nice...but one suggestion. Make it a green LED instead of a red LED. In most of the electronics world - green means 'good' and red means 'problem'.

It is nice to have something on the board to show they are actually powered up.
Gee - wouldn't it have been nice if Rockwell put these in to begin with?

Ed

 

[KenLayton]

It would have been nice if Rockwell would have put in the LED's and some test points.

 

[Sprout]

...it'd have been even nicer if the designer(s) at Rockwell all had severe arachnophobia

 

[aeneas]

thanks for the tip !
can you add it to pinwiki.com ?

 

[KenLayton]

Auxilliary Lamp Driver LED

Adding a "+5v" LED indicator for the auxilliary lamp driver board used in Black Hole and Haunted House.

Parts needed:

1 Red LED

1 Resistor, 330 ohms, 1/4 watt

Drill two 1/16" diameter holes about 3mm apart in the locations indicated in the pictures.

Mount LED with the flat side toward the edge of the board.

The lead from the LED's flat side will be soldered to pin 2 (ground) of connector A11P1. Be sure to slide a piece of heat shrink tubing over this lead so it does not accidently short to the other connector pins.

The other lead of the LED will be soldered to one end of the 330 ohm resistor.

The other end of the resistor will be soldered to pin 4 (+5 volts) of connector A11P1.

Whenever the machine is on, the LED should be lit, indicating the auxilliary lamp driver board is receiving power.

 

[KenLayton]

Sound Speech power supply board LED's

Next up is the Sound/Speech power supply board. It gets four LED's! These are to indicate the presence of -12 volts, +12 volts, and +30 volts going out to the actual sound/speech board and to indicate +24 volts coming in to the power supply board.

Parts needed:

4 Red LED's

2 Resistors, 1 k, 1/4 watt

1 Resistor, 2.2k, 1/4 watt

1 Resistor, 3.0 k, 1/4 watt

Mounting the LED's:

Drill a total of eight 1/16" holes at the points shown in the pictures near connector A7P1. Lead spacing per LED is about 3mm. Be sure the LED's are not too close to each other to interfere with sitting flat against the board. The +12 and +30 volt LED's will mount with the flat side facing diagonally (7 o'clock) toward the lower left board mounting hole.

Wiring:
The -12 volt LED will have the lead of the round side (anode) soldered to the heavy ground trace of the board. You'll need to scrape some of the green paint off the trace first. The other lead of this LED will be soldered to one end of a 1k resistor. The other end of this resistor will be soldered to the junction point of resistor R2 and the anode of zener diode CR2.

The +24 volt LED will have the lead from the flat side (cathode) of the LED soldered to the heavy ground trace on the board. You'll need to scrape a bit of the green paint off the trace first. The other lead of the LED will be soldered to one end of a 2.2k resistor. The other end of the resistor will be soldered to the trace going to connector A7P1 pin 6 (+24 volts). Again, you'll need to scrape some of the green paint from the trace first.

 

[KenLayton]

Continued.

The +12 volt LED will have the lead from the flat side (cathode) of the LED soldered to the heavy ground trace. You will need to scrape some of the green paint off the trace first. The other lead of the LED will be soldered to one end of a 1k resistor. The other end of this resistor will be soldered to to the trace going to connector A7P1 pin 1 (+12 volts). You will need to scrape some of the green paint off of the trace first.

The +30 volt LED will have the lead of the flat side (cathode) soldered to the heavy ground trace. You will need to scrape off some of the green paint from the trace first. The other lead of the LED will be soldered to one end of a 3 k resistor. The other end of this resistor will be soldered to the trace going to connector A7P1 pin 2 (+30 volts). You will need to scrape some of the green paint from the trace first.

These LED's above are all optional. The board never originally came with anything to indicate presence of voltages. If you only want to install one, that's fine. I chose to install all four so I can see at a glance that all four voltages are present. You don't have to install all four if you don't want to.

In my picture of the finished front of the board the LED's from top to bottom are:

-12v
+24v

+12v
+30v

In my picture of the wiring on the back (foil) side of the board, the resistors top to bottom are:

1K

2.2K

1K

3K

 

[KenLayton]

In the next few days, I will take a picture of the inside of the backbox of a Haunted House machine with all the LED's installed on the boards and lit up.

 

[KenLayton]

Pictures of the System 80 boards installed in a Haunted House machine with all the LED's lit up on the boards. I've circled the LED's in the picture.

The Auxilliary Lamp Driver board with the LED lit.

 

[KenLayton]

Sound Speech power supply board, Driver board, and CPU board with the LED's lit up.

 

[blownfuse]

I was doing System 80 LED diagnostic mods similar to this 20 years ago. LOL, glad to see people finally catching up. Add a TP to the CPU board for 5VDC voltage adjustment while you're at it. Put it down near the driver board since this is about the center of the system.

blownfuse
System 80, not just a job, it's an adventure

 

[KenLayton]

Thanks for the tip !
Can you add it to pinwiki.com ?

I just added this to the System 80 section of pinwiki today.

 

[OTTOgd]

Great mods. Thanks for doing this.

 

[KenLayton]

I have now added a +60 volt power indicating LED to the System 80/80A power supply board. This indicates the presence of the + 60 volts needed to operate the score displays. All instructions and pictures are now posted at pinwiki:

http://www.pinwiki.com/wiki/index.p...tem_80#System_80.2F80A_Power_Supply_Board_LED