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sega ffb driver board.. error

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Category: Technical
Forum Name: Tech, Maintenance & Repairs
Forum Description: Need Help? Ask Here
Printed Date: 02 Mar 2021 at 8:17pm

Topic: sega ffb driver board.. error
Posted By: Retroman839
Subject: sega ffb driver board.. error
Date Posted: 19 Feb 2021 at 5:35pm
just been playing ferrari f355, force feed back stopped operating.

led display on the force feed back board looks like 44 44
after reset looks like 22 22

wheel turns left then right then centres ok on power up..

i looked at the table of fault codes amd it says about leave off for 10 mins,
as can over heat...

just wondering my if anyone has any helpful info on t hi s?
much appreciated

i think this is error 22?

not sure if it’s error 2 or error 22?

Posted By: Retroman839
Date Posted: 20 Feb 2021 at 10:01pm
so did more testing
steering centres are 80h

error code i’m getting is

er. 4      or 44

Posted By: Retroman839
Date Posted: 20 Feb 2021 at 10:03pm
broken traces on the above chip ?

Posted By: Retroman839
Date Posted: 22 Feb 2021 at 11:57pm
tested continuity on all legs on chip amd inspection under light magnifier all visually looks fine

i have had the led displays read 11 11 also
but mainly just 44 44    i have found
out the the leds should read     88 88 ?
so have i only got half?   

i have been working on this ferrari for a while now   replaced two dead naomi mother boards...
force feed back was fine then just stopped?
wheel rolls left then right then centres on power up so motors are all fine...
but in drive board test it does not respond...
really want to have a go on this ferrari game so if anyone can help massively appreciate it

Posted By: Flynn
Date Posted: 23 Feb 2021 at 12:47am
Ill see if Ive got any spares from my F355 twin that might help you.

Shall drop you message tomorrow 

Posted By: Retroman839
Date Posted: 23 Feb 2021 at 4:39am
thank you flynn
i have been doing some reading up online.
regarding the command line from sega ffb

the analog signal seems to go      from 00 00   to 88 88
so there fore   44 44 is centre or   no reading at all —-   dead signal   or start point for reading to initiate..

so i’m deducing that i have a dead potentiometer. or loose wire ( bad connectivity ) to the potentiometer that controll’s the ffb.     

i will use my multi meter and try to test continuity from the   ffb pot to the header that connects to the ffb controller pcb.                  

44 44 is no signal at all      
the steering works fine in   game plays perfect. so steering pot to game io is fine.

but the led displays stay at 44 44   so no readings are being picked up from the ffb pot by the controller pcb.

any one got the schematics for either daytona 2 / scud race / f355 / or sega rally 2 ?

as would be handy to work out where the signal path wires run from both pots? making it quicker
to test signals points that are shared between pots and pcb..

hopefully the wires are colour matched.

assuming a bad pot voltage input out put voltage will just be static.
so i can read the pot as well?

this will determine a good or bad   potentiometer?


Posted By: Sbdesign
Date Posted: 23 Feb 2021 at 8:30am
If I remember correctly, there is 2 pots (but wait for someone else to chime, or you look)
1 pot - steering
1 pot - ffb

So like you are thinking, the one for ffb could be disconnected / broke, which allows steering from the working one, and no ffb reading from the other.

Remember you can check the ohm reading on the pot which should go to 5,000

Working on to many machines to mention.

Posted By: Retroman839
Date Posted: 23 Feb 2021 at 8:59am
yeh seem about right
as it’s only
been played once or twice for minutes since i have had it...
so i’m thinking the pot has possibly given up working...
which i read somewhere is quite common

Posted By: Retroman839
Date Posted: 24 Feb 2021 at 7:11pm
i found the steering pot

but i cannot locate the ffb pot?

i have removed the drive bd   7seg.

i have read the eprom.. and i have nothing to compare it with if any one has a ferrari drive bd eprom 21867

or the dumped file i would love to see it to compare just in case mine is corrupt

Posted By: Retroman839
Date Posted: 26 Feb 2021 at 6:16pm
all working   replaced the 7seg drive bd

all good!

Posted By: Flynn
Date Posted: 26 Feb 2021 at 6:31pm
So it was just the drive board in the end.

Did you have to buy a replacement?

Posted By: Retroman839
Date Posted: 26 Feb 2021 at 6:45pm
yep.. i bought 3

got lucky with 1

other 2 dead..

now got a fully working dx

i’m moving into the last phase of resto
the cosmetics.. replacing all lamps now

Posted By: G-man
Date Posted: 26 Feb 2021 at 6:57pm
I had 2 of the Model 3 ones die due to a poor ground connection, so I now always make sure this is good before using it.

Also happened to a mates Sega Rally 2 machine, same issue.

Posted By: Retroman839
Date Posted: 26 Feb 2021 at 7:52pm
right ok
will keep that in mind
thanks g man

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