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Backbox Connector Confusion.
One really nasty problem with Gottlieb System3 games are the backbox connectors. If for some reason someone has removed all the connectors from the circuit boards (for moving the game, etc), it can be an absolute hair puller putting the connectors back where they belong! The problem is many of these connectors are the same exact size and have no "key". So one connector can often plug into two adjacent connectors. Because of this below are the easily confused connectors for each board *including* wire color. Wire color is the only way to tell one connector from another of the same size.
Speaking of wire color, each wire has a white base color with *three* colored stripes. Gottlieb was the only pinball manufacturer to color wires in this manner. In fact Gottlieb had their own machine which fed white wire and put the colors stripes on the wire. All the other manufacturers bought their wire pre-colored. The Gottlieb wire coloring does take a bit of getting used to.
WARNING: IF THE BACKBOX CONNECTORS ARE ATTACHED INCORRECTLY, DAMAGE WILL OCCUR TO THE CIRCUIT BOARDS.
ALSO DO NOT REMOVE ANY CONNECTORS THAT ATTACH TO THE A8 DOT MATRIX DISPLAY BOARD WHILE THE POWER IS ON (INCLUDING THE DOT MATRIX DISPLAY ITSELF).
Failure to heed the above advise will do damage to a Gottlieb System3 boardset.
A1 CPU Control Board Connectors.
A1J1 pin 1=Blue, Gray, Gray. Pin 2=Blue, gray, gray. +5 volt power.
A1J4 pin 1=Violet, Violet, Orange. Pin 2=Orange, blue, blue. Sound interface.
A1J5 pin 1=Blue, Violet, Violet (often this wire is missing). Pin 2=blue, blue, blue. Switch matrix return.
A2 Power Supply Connectors.
A2J1 pin 1=red, black, black. Pin 2=white. Raw power in.
A2J2 pin 1=blue, gray, gray. Pin 2=blue, gray, gray. Regulated +5 volt power out.
A3 Driver Board Connectors.
A3J1 pin 1=white. Pin 2=blue, gray, gray. Power in.
A3J3 pin 1=violet, orange, orange. Pin 2=violet, red, red. Lamp/Switch matrix strobe.
A3J4 pin 1=grey, black, black. Pin 2=gray, brown, brown. Lamp matrix return.
A3J5 pin 1=red, black, black. Pin 2=red, brown, brown. Solenoids 0-15.
A3J6 pin 1=green, black, black. Pin 2=green, brown, brown. Solenods 16-31.
A3J7 pin 1=white. Pin 2=white. Lamp matrix and solenoid ground.
A5 Aux Power Supply Connectors.
A5J1 pin 1=Brown, Brown, Black. Pin 2=white, blue, blue.
A6 Sound Board Connectors.
A6J1 10 pin .156" inline Molex, key = pin 4.
A6J2 9 pin .156" inline Molex, key = pin 7.
A8 Dot Matrix Controller Board Connectors.
A8J1 pin 1=Brown, Red, Red. Pin 2=brown, yellow, yellow. Power in; has ceramic noise filter.
A8J2 pin 1=Blue, Gray, Gray. Pin 2=white, gray, gray. Power out to score display.
A20 Aux Sound Board Connectors.
A20J3 pin 1=red shielded wire. Pin 2=white, yellow, yellow.
A20J1 pin 1=blue, gray, gray. Pin 2=green, green, brown.
Note some backbox wiring have a 2 prong connector that connects to raw 12 volts (as fed to the A2 power supply). This just happens to be the same style connector that is used for the speakers. If this is accidently connected to a speaker connector, it will smoke the TDA2040 (or TDA2030) amplifier chips on the A5 Auxiliary Power Supply, the LM340T (or 7805) 5 volt 1 amp voltage regulator, and the MC3403 (or LM324AN) op-amp chip. To make things worse, the wire colors for the speakers and the 12 volts are very similar:
12 volts = red black black
Speaker = black red red
Be careful not to get these mixed up.
/C
