VansAirForceForums  
Home > VansAirForceForums

- POSTING RULES
- Donate yearly (please).
- Advertise in here!

- Today's Posts | Insert Pics

  #1  
Old 02-18-2017, 10:37 AM
dave4754 dave4754 is offline
 
Join Date: Oct 2009
Location: Edson, Alberta, Canada
Posts: 346
Default A wisp of smoke.....

Ok I was bored one night and thought I would check out my new to me Turn and Bank indicator electric 14 V.

A little tired i misread the pinout and connected postive to negative and it didnt power up of course.

The little wisp of smoke arose in the glass and my question to any who might know is:

is it toast? Have i just wasted 500 dollars worth of T/B instrument?

The unit is

Electric Gyro corp. Model 13494T100-(54)

Would you pay to have this model rebuilt?

I hate being this stupid but it helps to remind me I am human I guess .LOL
__________________
Dave Cobb
=VAF=2017 Donation - and a bit extra for great work!
Empennage RV 7 - Tipper
Wings complere

Fuse coming along, Canopy looking good!
AME reviewed and repaired O-320-Lyc installed
Reply With Quote
  #2  
Old 02-18-2017, 10:55 AM
rv7charlie rv7charlie is offline
 
Join Date: May 2006
Location: Pocahontas MS
Posts: 1,857
Default

Usually, if you let the magic smoke out, the thing won't work any more. Easy enough to check, though; just hook it up properly & see if it works.

As to whether to have it rebuilt, have you looked at what solid state units are selling for these days?
Reply With Quote
  #3  
Old 02-18-2017, 11:12 AM
dave4754 dave4754 is offline
 
Join Date: Oct 2009
Location: Edson, Alberta, Canada
Posts: 346
Default Solid State?

No I havent i really am out of my league on these things.

What brand would you suggest that is solid state and reasonable cost. I have Dynon on board and this is going to be backup during night VFR.
__________________
Dave Cobb
=VAF=2017 Donation - and a bit extra for great work!
Empennage RV 7 - Tipper
Wings complere

Fuse coming along, Canopy looking good!
AME reviewed and repaired O-320-Lyc installed
Reply With Quote
  #4  
Old 02-18-2017, 11:58 AM
az_gila's Avatar
az_gila az_gila is offline
 
Join Date: Jan 2005
Location: 57AZ - NW Tucson area
Posts: 8,415
Question

I'm a bit surprised the magic smoke came out. I thought those units only had a gyro in them with no solid state electronics and expected it simply to run backwards if the power inputs are reversed.

Does anyone know what circuitry is inside the unit?

I STAND CORRECTED...

Apparently there is probably a circuit board in the back of the unit with fried components.

https://www.youtube.com/watch?v=WbaRm12nRL4

If you want a DIY repair look at the large electrolytic capacitor for replacement. The escaping smoke was not a good sign.
__________________
Gil Alexander
EAA Technical Counselor, Airframe Mechanic
RV-6A N61GX - finally flying
Grumman Tiger N12GA - flying
La Cholla Airpark (57AZ) Tucson AZ

Last edited by az_gila : 02-18-2017 at 12:08 PM. Reason: added youtube link
Reply With Quote
  #5  
Old 02-18-2017, 12:24 PM
AllThumbs's Avatar
AllThumbs AllThumbs is offline
 
Join Date: Oct 2007
Location: Novato, CA
Posts: 274
Default

If it had an LED backlight you might have exceeded the reverse voltage and let the smoke out of the little LED in the unit. That should be replaceable.

Ah - its an older unit - Gil's probably right and you smoked a cap or a diode on the board. Again, probably repairable.
__________________
RV-6 panel is fine. Just... fine.
2016 VAF dues paid!

Last edited by AllThumbs : 02-18-2017 at 12:28 PM.
Reply With Quote
  #6  
Old 02-18-2017, 12:48 PM
Ironflight's Avatar
Ironflight Ironflight is offline
VAF Moderator / Line Boy
 
Join Date: Jan 2005
Location: Dayton, NV
Posts: 11,203
Default

Quote:
Originally Posted by dave4754 View Post
No I havent i really am out of my league on these things.

What brand would you suggest that is solid state and reasonable cost. I have Dynon on board and this is going to be backup during night VFR.
If you really want a T&B instrument, I'd suggest looking at the solid State device (available as a TC or T&B) from BeLite. Small, weighs almost nothing, bright display, no moving parts, and fits in a 2 - 1/4" hole. And for what it will cost to send your unit to a shop, you can pay for the BeLite. I've had one on the glare shield of my -8 for a few months, and it just works.
__________________
Paul F. Dye
Editor in Chief - KITPLANES Magazine
RV-8 - N188PD - "Valkyrie"
RV-6 (By Marriage) - N164MS - "Mikey"
RV-3B - N13PL - "Tsamsiyu"
A&P, EAA Tech Counselor/Flight Advisor
Dayton Valley Airpark (A34)
http://Ironflight.com
Reply With Quote
  #7  
Old 03-07-2017, 12:42 PM
dave4754 dave4754 is offline
 
Join Date: Oct 2009
Location: Edson, Alberta, Canada
Posts: 346
Default Closing off Thread - final remarks on T/B

The T/B unit proved to be older than i thought and although picked up by a reputable manufacturer many components had changed making this one ancient.

The reverse polarity caused a meltdown of the Capacitator and resistor in the circuitry in back of the gyro.

My local avionics shop in Edmonton were great guys and gave me a core trade in on an RC Allen overhauled unit at 850 Cndn which is pretty good considering they are 12 to 1300 New.

This device in my mind is critical when at night and the Dynon goes offline on you in the dark. Of Course i could borrow my wifes necklace and hand it from the crossbar but I would have to have access to Youtube to make that work! lol

Thanks as always for any info passed on this... on to some more rivet banging... at least they dont smoke~
__________________
Dave Cobb
=VAF=2017 Donation - and a bit extra for great work!
Empennage RV 7 - Tipper
Wings complere

Fuse coming along, Canopy looking good!
AME reviewed and repaired O-320-Lyc installed
Reply With Quote
  #8  
Old 03-07-2017, 01:54 PM
N941WR's Avatar
N941WR N941WR is online now
 
Join Date: Jan 2005
Location: SC
Posts: 10,816
Default

I would rather fly with the Dynon D2 as a backup than a T&B instrument.
__________________
Bill R.
RV-9 (Yes, it's a dragon tail)
O-360 w/ dual P-mags
Build the plane you want, not the plane others want you to build!
SC86 - Easley, SC
www.repucci.com/bill/baf.html
Reply With Quote
  #9  
Old 03-07-2017, 02:08 PM
GaryK's Avatar
GaryK GaryK is offline
 
Join Date: Nov 2005
Location: Zeeland, Michigan
Posts: 299
Default

The Garmin G5 is just under $1,200.
Reply With Quote
  #10  
Old 03-07-2017, 10:16 PM
FasGlas FasGlas is offline
 
Join Date: Mar 2014
Location: Prescott, AZ
Posts: 390
Default

Most of these electric gyros have a voltage regulator and no diode protection for reverse polarity. (The cost of a few pennies). I've repaired a few over the years with a smoked regulator. If you can find someone electronically inclined perhaps he could replace it for you. There would be no other damage besides the voltage regulator.
Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -6. The time now is 04:23 PM.


The VAFForums come to you courtesy Delta Romeo, LLC. By viewing and participating in them you agree to build your plane using standardized methods and practices and to fly it safely and in accordance with the laws governing the country you are located in.