Hang on steering issue

[Yakama]

Working on a hang on now and got a steering issue. It will only go right or sometimes straighten up. Pot seems fine and I’ve swapped it for another but same symptom.

I note when testing continuity when turning left and sometimes at neutral steering I get continuity between the red and green wire. I assume this isn’t correct? This is even when unplugged from the rest of the loom.

When in the test menu at neutral steering I get 78H (manual says it should be 80H so not far off). Everything else in the test menu tests ok and when doing the pcb test in the menu it checks out ok and seems to work fine.

Only other thing I’ve noticed is that if you roll off the throttle it sticks at like 78kph I think rather than going to zero and tops out at 134kph. So something ain’t right

 

[smarty]

Hi there @Yakama,
You should be testing the pot using resistance reading, It should read 5K Ohm from the outside two legs and then from outside to centre pin will change from low resistance up to 5K when the pot is moved, you can try this on both outer pins to centre pin, the resistance value should increase or decrease in a smooth manor as the steering positions changed. In test mode a reading of 78H is outside the spec for the centre position and means the bike will be turning all the time. The Spec is 80H +/- 4H which means it can only be from 7CH - 80H - 84H to maintain centre position when in the bars are in the neutral position. When in test mode you will need to adjust the gear connected to the pot so it is as close to 80H as possible. 78H is -8H from the spec and needs adjusting.

Its is a game feature that the bike has a minimum speed of 78kph - That is correct for the game and not a fault, at hte state the bike will accelerate to this speed on its own. You are always moving forward.

Let us know how you get on with adjusting the pot.

 

[Yakama]

Thanks for the reply. Thing is 78h is at max lock on the pot so when I adjust it I can’t seem to get to 80H. I tried the other spare pot too and it’s the same. I can read 0 to 5k ohms when adjusting the pot disconnected from the machine but when soldered in I can’t. It goes very quickly from 0 up to like 16k then O.L New to electronics and still learning so not sure if that’s normal or not

 

[Bods]

If I remember right the Pink wire is usually 5V on sega and that should be on one end of the pot not the middle, 1 end is 5v, other end 0v and the middle is the voltage output to the gameboard, now which wire is the 0v though

Ah someone saying the blue is output brown is 0v so I'd swap around the pink and blue wires, if steering then the wrong way, switch the pink and brown around
hopefully that will sort it if pots are okay

 

[Yakama]

Thanks will try that when I get home. I couldn’t find anything in the manual or online about how it should be wired up. This thing has been apart as there is loads of bolts missing so may have been put back wrong before I got it

 

[Bods]

Thanks will try that when I get home. I couldn’t find anything in the manual or online about how it should be wired up. This thing has been apart as there is loads of bolts missing so may have been put back wrong before I got it

The manuals aren't great for these things, basic info you'd hope to see in them lol, found this pic of sega cab pot so swapping pink and blue should sort it
with the 5v pink on middle its only using half the pot, so where the middle should be around 2.5v you'll only get 2.5v to 5v instead of the whole 0v to 5v output which is why you basically get steering one way

 

[Yakama]

Great thank you. I feel a better knowledge of electrics would help me as I’m sure these are simple things. I’m learning slowly 😂

 

[Yakama]

The manuals aren't great for these things, basic info you'd hope to see in them lol, found this pic of sega cab pot so swapping pink and blue should sort it
with the 5v pink on middle its only using half the pot, so where the middle should be around 2.5v you'll only get 2.5v to 5v instead of the whole 0v to 5v output which is why you basically get steering one way
View attachment 51157

Edited for stupidity. Ok I think I have something wrong. I wired it up like the pic and the pot started smoking so something is definitely wrong. I get my 5v but wonder if this pot is broken. I tried another two used ones that came with it and one gets the same result as before and the other glitches the whole system and resets it when the pot is moved. I’m going to order new pots incase all of these are broken

 

[Yakama]

Ok so brand new pots arrived today and after installation I get the same problem. Still only getting 78H at max lock in the test menu so I’m not sure what to try now. Any ideas?

Also again when I test the resistance when the pot in soldered in I get zero and there is continuity between the two pins (pink and blue) disconnect that section of the loom and I’m back to getting my resistance from 0-5k

 

[Yakama]

Update to this. The pot was bad but it seems the board has an issue that is affecting the steering. Now that I have swapped in the new pi board from @smarty it’s working fine