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Testing the Vidiot Board "on the bench".
The Vidiot board can be tested without the rest of the game and on the work bench. All that is needed is 12 volts DC. Ideally it would be nice to have a video game monitor and speaker too, but it's not completely necessary. Here's the connectors needed to boot the Vidiot board outside of the game.
VJ3 - Power & ground (12 pin .156" molex connector):
Pin 1,2 = 12 volts DC
Pin 7,9,11 = ground (all three pins must be connected to ground)
VJ4 - Video (optional, 12 pin .156" molex connector):
Pin 2 = ground
Pin 3 = sync
Pin 5 = green
Pin 7 = blue
Pin 11 = red
VJ5 - Speaker (optional, 2 pin .156" molex connector):
Pin 1,2 to speaker.
Be sure to check the power voltages with your work bench test rig: Use the test points on the Vidiot board.
TP6 = 12 volts DC
TP3 = Ground
TP2 = +5 volts DC
TP5 = 8.2 volts DC
With power connected, the Vidiot board should flash ten times (flash codes are shown below), and the studder/abbreviated Pacman tune should play during bootup (assuming a speaker is connected to J5). After the ten flashes, pressing SW1 will bring up the either the Communications test (with no Xmit/Rec info), or the color bar test. If the Communications test comes up, press SW1 again for the color bar test. Of course both of these test are useless unless there is a video monitor connected. Pressing SW2 will play a short electronic space sound and the LED will flash two times.
Tried that and didn't get anything. And asked a few people about this and was told it doesn't work. Which is a bummer as it's a pretty easy test.
I performed that test on a Vidiot I have here and it worked. Not sure what I did differently. I got all 10 flashes on the board which is going in my second baby. Anyway, good luck on the sale.
that works most of the time. Still doesn't tell you for sure if its communicating properly with the mpu though. The only way to really test them is in a machine, or with the full harness and mpu and full complement of switches and joystick, with a nice long burn in. The sockets on them are horrid and often times even though you get 10 flashes, will act up once they heat up.