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Super Monaco GP Airdrive

First I look at your results in the tables, then we'll see. :)
It would be ideal if you make a table for input signals 1-8 (red) and a table for output signals 1-8 (blue).
 
Yep. I'll do the same as I did for the main board :) At least I know all the AirDrive solenoids work!
 
OK, results from testing PC3 & PC4 pins as detailed in your picture.....

table-chartPC4&PC5.png


The input & output gave the same result?
 
Hi, the input signals on PC3 and PC4 look fine, except for signal 8.
Yesterday signal 8 was LOW for all 10 tests, today it was HIGH.

Did you change anything?
If not then check signal 8 again on the gameboard (output).

Also make a table of the signals at PC3 and PC4 (output)
These are identical to those at the input, ie LOW = LOW and HIGH = HIGH.
But first it is important to see if SIgnal 8 always has the same logic level from the gameboard output to the driveboard input.
If the level of SIgnal 8 is really different, we need to find out at which point of the connection this happens.
Also measure the connector from the driveboard, on yesterday's picture I marked the 8 signals on the connector
 
I'll double check, I did change something, I removed the back cabinet as it's easier to get to the board to do the tests. The above table is for the inputs AND outputs, as you say they give the same result.

When you say "Also measure the connector from the driveboard, on yesterday's picture I marked the 8 signals on the connector" do you mean the logic level, ie, high or low? Thanks
 
Yes, I always mean the logic level at the moment.
It is important that all 8 signals from the gameboard, from the output of IC163 and IC164, to the driveboard PC3 and PC4, always have the same level at their output.

Check that again carefully. If that fits, then write in the table which HEX results you currently get with the 10 tests.
 
OK, it is high at the game board & driver board. Maybe the sensor switches the level of signal 8? I'll re-attach the back cabinet to verify if it switches back to low. The logic level at the driver board plug input matches what is found at the PC chips. Pin 3 on PC3 is the only pin 3 that is DEAD out of all of the PC chips, all others have either high or low. As I said when pin 3 is shorted to pin 2 the game works. I'll get the HEX values now....
 
That with signal 8 is good, then all levels seem to fit. :)
Good question what Signal 8 has which task, as you can see I haven't researched everything 100% yet.

There is the safety sensor and the pressure switch from the air compressor, these 2 sensors are read directly on the driveboard and are not part of the 8 signals that come from the gameboard.
I'll check that with pin3 on my driveboard.

Once I've finished my setup, I'll be able to test better and find out more things.
 
OK, I think it has to be down to pin 3, it's currently dead, short it to pin 2 and it all works. HEX values : -

table-charthex.png
 
with pin 2 & 3 shorted. It's so frustrating, with a decent schematic (thanks Sega!) this would be easy.

table-charthexshorted.png
 
OK, let's try something else quickly.
Unplug both connectors from the driveboard so it has no potential for anything.
Take a multimeter and set it to Ω.
Then measure the resistance between the red marked solder pad (JP1) and all red marked points (pins 1 - 3 - 5 - 7) on PC3 and PC4.

The result should be around 470 Ω each time

DB Measurment_1.JPG
 
I'm slowly freaking out :D
Plug all connectors back together and measure with the logictester signal 8 at IC163 IN and OUT (pin 7 and 10)
 
I'm wondering if the IC(s) on the game board is breaking down under load? The PC chips I've already swapped around, it made no difference....
 
Attention pin 7 and 10, not 7 and 9 The problem at the moment is signal 8 on PC3 = HIGH, but it should be LOW like yesterday.
 
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