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Author Topic: Revsim TQ Trim Indicator Motor Failure  (Read 648 times)

Offline jfuenmayor

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Revsim TQ Trim Indicator Motor Failure
« on: June 03, 2018, 12:32:44 PM »

Hi guys:

I need some help with my Revsim TQ.

After upgrading to the latest version of Prosim, v2.05, and after some maintenance work on my sim that has kept me busy for the past weeks (cleaning, cables etc.), while testing an engine failure and after leveling, rudder trimming etc., I noticed that the Trim Wheel Indicator stopped moving.

Upon opening the TQ, all cables and connectors  seemed to be in place. I normally do not turn on the trim wheel, but when I did, it would not stop moving on its own without any input from the trim switches. Anyhow, everything else works well including the autothrottles. The trim indicator on the EICAS works, and shows motion as trimming is applied with the trim buttons on the yoke, which indicates that the software is operating as it should.. The sim is fully flyable except for this. No trim wheel (it runs constantly, managed by turning of the motor with the switch on the TQ), and no trim indicator operation on the TQ.

This TQ is one of the latest built before REVSIM went belly up. It is a very solid and sturdy unit that has been working flawlessly for the past three years. This unit has a Joystick card and two Opencockpits motor cards. After testing everything I have come to the conclusion that the motor is done. Lastly, when I open the SIOC monitor, the trim motor shows "APAGADO" which means  turned off, in summary defunct, I think.

Now, my problem is that I have no diagram for the unit and I cannot even determine with certainty, where and how to access, remove and hence replace the motor, short of disassembling blindly the whole thing, which of course, I would prefer not to do. So if any of you has any info in this regard, I would appreciate the input. The SIOC script I use is the one that was supplied by REVSIM and which I modified.

Thanks in advance.


Offline iwik

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Re: Revsim TQ Trim Indicator Motor Failure
« Reply #1 on: June 03, 2018, 03:13:11 PM »
It sound like its not receiving feedback as to where the trim wheel is set. So i would look
in the sioc script to see if they are using a pot to read position. Then measure on the pot
input to the interface to see if this voltage is varying. The pot or wiring maybe faulty.
Or the motor cards output may be shorted and the motor is being driven constantly. You could try and swap motor cards.
« Last Edit: June 03, 2018, 03:18:41 PM by iwik »

Offline jfuenmayor

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Re: Revsim TQ Trim Indicator Motor Failure
« Reply #2 on: June 06, 2018, 02:59:59 PM »

Thanks Les. I just read your post.
I will try that.


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