Initial conditions

I bought this cab a lot of years ago in Germany but I found enough time to restore it recently only. Cleaning the cab I found these coins. A long trip. If it could tell its story…

Cabinet was quite complete. Only the coin door and the gear shift knob were missing.

Power section (1)

This is the power section as I found it.

Power section (2)

Clening these components I had a good result. Fortunately I had to remove dust only. Usually I find any kind of things…

Sound panel

Just repainting here and there…

Score panel

Here is the score panel before and after cleaning and repainting

T-molding

T-molding was very compromised. I had to remove all the parts and replace with a new one.

On the left the old T-molding. On the right the new one.

Inside

After cleaning I put all stuff inside again.

 

Pedal

This is what I made to the pedal.

Control panel

These are the initial conditions of the control panel

Control panel back side

This is the rear of the panel. Gauges have been still removed.

   

Control panel front side

First of all, I sanded the burned area, then I filled the holes. I sanded it again and then I covered everything with resin combined with fiberglass and… I sanded it again….

next step… I used a Primer to prepare the surface to the final color. once the primer was on the surface I use a sponge in order to emulate the original irregular pattern. once it was dry I sprayed it black. that’s all

The wheel

Here is the wheel

Coin door and cash box

These are the coin door and the cash box

Boardset – Sound board

Boardset – Score board

Boardset – Main board

Boardset – P-Rom board

Cabinet

This is the cab after restoration.

 

Troubleshooting the display

Display was corrupted. This is the pattern shows during test:

Looking at the schematics I could see the corrupted digits are all connected to the same bus.

Changing IC83 the display started working properly.

 

Troubleshooting the pedal

During tests I can see pedal values sequence is 3-2-3 instead of 0-1-2-3.

3-2-3 means “Accel B” doesn’t work. Changing the IC on the pedal circuit (7414)  pedal started to work properly for few days but then I had to replace 7414 again. I changed other 3 times the same chip. Substituting this component with a 7404 I had no more problems.

3D malfunctioning

Last week I saw my TURBO had this funny problem:

 

https://www.youtube.com/watch?v=SikhA6IW5wg 

 

after some checks I understood that the problem was into the power connector on the CPU board. removing the oxide from the connector I solved this problem but another one raised up

Wrong car sprites

Probably the power problems on the connector made a damaged in the circuit that draws cars. I had a problem on violet and green cards; here you can see a movie of the problem.

I checked the EPROMS on the PROM board and I found the EPROM dedicated to the violet and green cars! It is the EPR1248. EPR1247 is dedicated to the other cars, yellows and blues.

This is a movie of the game with the EPR1248 removed

I checked the EPROM but the checksum was ok


Swapping EPR1247 and 1248 cars swapped position too but the problem persisted on violet and green cars so I burned a new EPR1248 although ROMIDENT said it was ok. So this was the right decision because with a new EPROM the game played perfectly.

Free Play

Thanks to Matt Osborn I installed the FREE PLAY eprom on my boardsets; very easy job and great result? Are you interested in this modification including the save kit?, please go here. This is the CPU board before the modification. You can see the metal case with the encrypted CPU


and here is the same board with the Z80 instead of the encrypted CPU and the unencrypted EPROMs installed