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Sorti en 2010, le Logitech G27 est un volant électronique conçu pour les jeux vidéo Sim racing sur PC, PS2 et PS3.

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Slow rotation when calibration, then never gets working

Hi everyone, just bought a used ARC team Modded G27, that has many problems.

I post a link to a video as explaining it in words gets long

https://goo.gl/photos/tHGf3QA3Bzcccdw56

Briefly the wheel is recognised (every button and potentiometer and pedals and shifter) but the calibration part of force feedback happens slowly, then interrupts, the heel never gets hard to turn, and basically it's useless....

Resoldered DC cable, checked it ha good insulation and voltage is 41.6.

Any idea of where to start troubleshooting?

Aggiorna (23/01/2016)

I found a piece of manual online https://www.yumpu.com/en/document/view/1... where it states that the voltage in the mod should be 40.5, so 41.6 should be fine......

Maybe I could fully dismantle the unit and test component by component with a tester if resistances and voltages are fine. I should anyhow need a bit of help doing it.. and maybe a probability assessment of what is probably wrong so I could not fall in Murphy's law and let it for last...

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Hi,

Just curious. Your voltage reading is that correct? Have read that ARC mod was to increase power to 48V, http://www.racedepartment.com/threads/ar... Is yours maybe a little low then. Incorrect power can cause all sorts of funny problems. Some things may work others not, it depends then on component characteristics, whether they work as designed or not at a lower voltage..

par

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Good objection, I posed myself this question; the power supply has a voltage selector (a rotary knob) that can increase or decrease voltage. It has black signs to mark where it should go (I guess) so it is possibly in the right position. Howevere I even tried to rotate it, with no luck....

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Hi Luca,

I guess this is where you start. Find out why you do not have 48V coming out of your power supply. Be careful, working on live power supplies can be 'lethal'. Check it over first with the power removed. Look for any obvious signs of trouble, like stressed components (bulging capacitors) and dry joints.

par

Hi Luca,

Also check the cable shielding is properly connected. Good luck.

par

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Someone on other sites suggested it could be one of the two motors to be worn out, which would explain the slow rotation.

Any suggestion on how to test this hypotesis? I guess I'll have di dismantle the unit, then extract each motor and connect it to a 24v power source...

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Hi,

The only way I know to test speed of a motor requires some equipment. It is good that you have two to compare. If the rotating part is wide enough like a pully wheel or a fan blade, paint a dot on it then use a strobe light. (like they used to use on cars to test timing) If you get the timing (frequency of the light pulse) right the dot will 'appear' to be stopped when the motor is turning. Then you can compare the two motors to see if one is slower. If the dot moves 'forward' or 'backward' it means it is faster or slower.

par

Hi Luca,

Just thought. Is the motor attached to a 'gear box'. I am wondering if the shaft is 'slipping' in the gearbox or if the gears have a few missing cogs. So that the motor speed may be alright but the gears are not moving at the right speed.

If it is a 'stepper' type motor I do not know how to test them for correct speed.

par

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