Trim on RV-12 (New Project) not works

[herberttelge]

Need help from a builder or technician to identify why I can not get my trim to work up or down at all.

I went through all the continuity tests provided by Van's (Switches, Harness, and making the servo work properly with external 12v.power, do not get power output from the control module fuselage pin 31 & 32. suposedly the potenciometer was properly set up by Van's after I returned the controle module for a check up.

[mv031161]

I spoke with Herbert yesterday and suggested he post here...we are good feiends from childhood and raced motocross all over South America togehter back in younger days..... Him and his father are building their RV 12 in lima peru. He has two issues and both related to the Dynon. His comm volume goes to ****. He can barely heard the radio and the trim works extremelly slow. If he connect the trim directly works fine. Entire d100 was sent to vans for check up and it was returned the same. Now he is waiting for another. Box to be sent down to Peru for swap and trouble shoot. Anyone have had this issue? All help and or recomendations are welcomed.

[Mich48041]

There are lots of posts on the RV-12 forum concerning the trim.
http://www.vansairforce.com/communit...splay.php?f=73
The Dynon has nothing to do with trim operation or radio volume.
I would try adjusting the potentiometers on Van's control board for both trim speed and for radio volume.
Below are links to posts about the RV-12 trim.
Joe Gores

http://www.vansairforce.com/communit...ad.php?t=88672
http://www.vansairforce.com/communit...ad.php?t=70121
http://www.vansairforce.com/communit...ad.php?t=65564
http://www.vansairforce.com/communit...ad.php?t=61336
http://www.vansairforce.com/communit...ad.php?t=48514
http://www.vansairforce.com/communit...ad.php?t=48023

[herberttelge]

Yesterday I went through all the pot adjustments re-checks for the fourth time without any success. Is it possible to get the electric diagrams for the TRIM system, we tested individual continuity for TRIM switch and harness (which are ok) but I am curious if the power supply to the switches unit come from the thick 2 wires plugged into the switches unit and then go through the Switch and then to the AV50000A, maybe there is a problem at the Switch unit??

[herberttelge]

Thanks Mitch, we were not able to make the trim work at all from the switch. I tested it with external power and it is OK, tested individually the Harness and Switch and are ok. I sent back the AV50000A control Module to Van's and Sterling (from Vans) told me it is ok. He is no sending me a new one for exchange. However a test pending might be to track down 12 volts power supply from battery to AV50000A (for TRIM operation only)???

[herberttelge]

Thanks Mitch, we were not able to make the TRIM work at all since the beggining, can someone explain on how to track down power supply all the way from battery to switch board?? and then to AV50000A.

[Mich48041]

Herbert,
Did you receive the private message that I sent to you?
Try posting on VansAirforce RV-12 forum. I have the Dynon D-180 system. Others are more knowledgeable with the SkyView system.
Joe Gores

[Mich48041]

Herbert,
Do you have Van's electrical drawing?
http://www.vansaircraft.com/public/d...1_07-08-13.zip
Check the 2 amp trim fuse.
There is a bundle of wires that goes between the AV-50001 switch & fuse module and the AV-50000A Control Module. Remove the 25-pin D-Sub connector from the AV-50000A and check for positive 12 volts DC on pin 9 (with master switch on).
Is there power on pin 9? Yes or no?
Joe Gores

[Mich48041]

Herbert,
The AV-50000A Control Module should have a 37-pin D-Sub connector for an autopilot, whether an autopilot is installed or not. Inside of that connector should be two jumpers for the elevator trim. One jumper connects pins 7 & 17. The other jumper connects pins 8 & 19. Check those jumpers to make sure they are installed in the correct holes.
Joe Gores

[herberttelge]

Dear Joe, many thanks for the orientation. Yesterday I checked
The electric power out of harness from the AV-50001 to the AV-50000A have continuity between pin 19 to 4 and 18 to 5 and a reading of aprox 5 volts at the 4 &5 pins when I press the trim switch up or down (inverting the conection), now I do not kwow if the 5 volt reading is enough power??? Anyway there is power going into the AV50000A. Then I tested the 31 and 32 pins coming out of the AV50000A without disconnecting the fuselage plug and the Switch plug to get the master to provide power. In this last test I do not get a strong voltage reading, by turning the pot left and then right I got a max voltage reding below 1 volt. Today will go over the tests you suggested yesterday on the Auto pilot 37 pin conector. Will let you know ASAP