Chase HQ restoration

[matsadona]

Hi All

Thought that I should share the story of my Chase HQ cabinet restoration. It was gutted from all goodies and I got it for free last summer and considered it as a long term project. With some luck I have now managed to salvage most parts so a finalization is near.
I have bought the original PCB but the monitor is a 10$ TV from a garage sell. Since it is a SCART equipped TV it is just a matter of 150Ohm resistors on the RGB leads and you are ready to go.
The pedal has a broken spring, so there is an elastic ribbon as a temporary solution. Will probably replace it with a NOS pedal later.
The steering wheel was missing the center detection board, but luckily I had a similar one that could be used. It just took some “creative” ideas to have it mounted. A glue gun can be very handy sometimes
All wires was cut here and there, so it took some hours of “beep-tests” with the schematics to figure it all out.
I’m still a bit confused about the speaker wires and the volume potentiometer. The schematics and the actual wiring in my cabinet isn’t consistent.
Have some more to do regarding that.

Did the first test drive yesterday and soon discovered that I had swapped the steering wires. So turning left caused the car to go right…

I also messed up the video wires so there is no red signal to the TV. Have to revisit that adapter.

I am also a bit confused about the patrol light outputs. I believed that the main pcb output was just a 12 or 5 volt signal, so I hooked up two SSR’s to them.
But, it seems that the output is some kind of data signal that has to be decoded since the SSR’s are active all time. It doesn’t seem to be an inverted signal, based on the fact that the behavior doesn’t change when the patrol lights are active.
I know that there should be a light output pcb, but that is missing. I assumed that it was just a simple relay/SSR pcb. But it seems to be a bit more complex.
Unfortunately I don’t have any logic probe so I can’t really investigate what is going on in that output signals, and the manuals doesn’t give you any help.
Any hints or detailed information regarding this would be much appreciated.