D-sub connector problem

buz · #1 11-08-2010, 06:38 PM

Has anyone ever had a problem with a D-sub connector?

I have a 25 pin on the back of the TruTrak Digi II head. When I engage the autopilot the pitch servo isn't working. If I reach back and pull up and hold up on the plug it engages and works fine.

I have tugged on all the pins, pulled them out and visually looked at them, made sure they were fully pushed in. It all looks good.

Any ideas?

Walt · #2 11-08-2010, 06:43 PM

Check the tension on each of the female pins using a singe male pin. Very rare for them to go bad on the crimped machined pins but on cheaper versions they can loosen up.

Trevor778 · #3 11-08-2010, 11:04 PM

Check to make sure your back shell hasn't been tightened on one of the wires. Sounds like it could be open and when you lift on the bundle it's getting a connection.

breister · #4 11-09-2010, 08:27 AM

I've had multiple issues with D-Subs, even with the high-grade crimp pins.

- In some, the pins "back out" a bit when installed even though they seem fully seated. I attribute this to cheaply constructed shells, and often the simplest answer is to re-pin a new shell.
- I've had instances where pins just don't seem to make good contact, and resorted to lightly deforming the female pins to grip better
- A bad crimp can make for a poor contact between pin and wire - there is no substitute for the "tug test"

All in all, once you are sure they are RIGHT they work fine.