LANCECASPER Posted January 13, 2022 Report Posted January 13, 2022 My airplane came with 4 Bose jacks installed. It looks like the back seat jacks are on one circuit breaker and the front seat jacks are on another. All four have audio, but on the most recent flight the two in the front have no power so the headsets need batteries, even though the circuit breaker is not tripped. I've re-set the breaker but still no power. There are no inline fuses front what I can tell. What am I missing? Quote
carusoam Posted January 13, 2022 Report Posted January 13, 2022 MS needs a good headset guy… Does an audio panel guy double as a headset guy? We have a good audio panel guy… (Mark) -a- Quote
LANCECASPER Posted January 13, 2022 Author Report Posted January 13, 2022 2 minutes ago, carusoam said: MS needs a good headset guy… Does an audio panel guy double as a headset guy? We have a good audio panel guy… (Mark) -a- I'd settle for an avionics guy . . lol 1 Quote
carusoam Posted January 13, 2022 Report Posted January 13, 2022 Let’s see if @Mscheuer is around… (Bose headset wiring question) Mark is an awesome resource for audio panels and how the good ones work… (PS Engineering if anyone needs a great audio panel…) He may have experience with the Bose headsets and how they are wired… Best regards, -a- Quote
LANCECASPER Posted January 13, 2022 Author Report Posted January 13, 2022 or maybe @Rmag @Baker Avionics @derekbox Quote
Baker Avionics Posted January 13, 2022 Report Posted January 13, 2022 1 hour ago, LANCECASPER said: or maybe @Rmag @Baker Avionics @derekbox Be sure there is ground there as well. There shouldn't be an inline fuse on there and the Lemo plugs are pretty straight forward. Truly, all you need there is Power, Ground and then the regular L,R, Lo, Mic Hi and Mic Lo. PTT isn't a pin on there as all that does is provide a ground to the Key Line to the Audio Panel. So, check both Power and Ground as the ground may have come off or loose. 3 Quote
LANCECASPER Posted January 20, 2022 Author Report Posted January 20, 2022 Without tearing apart the interior I've verified that the breaker has power going in and out, so the breaker is good. Since both front seats are on the same breaker, anyone know on a Mooney factory Bose install where the common ground for the two jacks would go? The Bose schematic shows the ground going to the headset jack barrel. Quote
Jerry 5TJ Posted January 20, 2022 Report Posted January 20, 2022 Check to see: Is there power on pin 1 of the LEMO jacks? Quote
LANCECASPER Posted January 20, 2022 Author Report Posted January 20, 2022 1 hour ago, Jerry 5TJ said: Check to see: Is there power on pin 1 of the LEMO jacks? Well, you are right there is no power on either #1 pins of the front jacks. Both of the back jacks have 24v on pin 1 Quote
Mcstealth Posted January 20, 2022 Report Posted January 20, 2022 18 hours ago, LANCECASPER said: Well, you are right there is no power on either #1 pins of the front jacks. Both of the back jacks have 24v on pin 1 Is there "supposed" to be power to either of the pins? Quote
LANCECASPER Posted January 20, 2022 Author Report Posted January 20, 2022 2 hours ago, Mcstealth said: Is there "supposed" to be power to either of the pins? yes Quote
Mcstealth Posted January 21, 2022 Report Posted January 21, 2022 Hmmmm. A broken ground is definitely a possibility. Quote
LANCECASPER Posted January 22, 2022 Author Report Posted January 22, 2022 7 hours ago, Mcstealth said: Hmmmm. A broken ground is definitely a possibility. No I don't think it's ground. There is no power there. I think @Jerry 5TJ hit the nail on the head - no power. Since the two front jacks are on the same breaker and neither of them works and there is power at the breaker I'm wondering if the power lead on the jacks ever got hooked up. This was built the summer of '08 right after the Type S came out and Mooney had a backlog to fill (ironically not long before the financial crisis that shut them down) so I'm wondering if this was just overlooked. The one previous owner used headsets that had two GA plugs so he wouldn't have noticed if the power was connected to the Bose plugs or not. Quote
Mcstealth Posted January 22, 2022 Report Posted January 22, 2022 Not that it is easy, but it should be straightforward following where there is power and where the power ends. Quote
LANCECASPER Posted January 22, 2022 Author Report Posted January 22, 2022 15 hours ago, Mcstealth said: Not that it is easy, but it should be straightforward following where there is power and where the power ends. Hahahahahaha, straightforward? Yes pull the seats out, pull the side panels, become a contortionist, crawl under there, get a muscle spasm in your back, dial 911 from a fetal position. . . for someone that knows what they are doing it probably is straightforward 1 1 Quote
Mcstealth Posted January 22, 2022 Report Posted January 22, 2022 Hey I prefaced that statement with "not that it is easy." I covered my bases 1 Quote
LANCECASPER Posted February 4, 2022 Author Report Posted February 4, 2022 1 hour ago, Mcstealth said: Any luck? Haven’t made any time for it. AA batteries are getting me through this 1st World crisis. . . . Lol 1 Quote
LANCECASPER Posted May 2, 2022 Author Report Posted May 2, 2022 FOLLOW UP: Mooney Service Center finds evidence of uninvited passengers They found some rodent droppings and nesting. It was cleaned up in the tail cone and cabin. What is very strange is that they chewed up only the Bose ground and power (black and red) wires. They gnawed into a little of the white insulation on intercom wires but didn't like that. If I had to guess those black and red wires were insulated with soy based insulation. (Mercedes used this on their wiring harnesses in the early 90's to be more environmentally friendly and rodents loved it. Tens of thousands of harnesses had to be replaced. Other companies have had to deal with this as well: https://nhoilundercoating.com/soy-based-wiring-how-to-help-keep-mice-out/) Quote
carusoam Posted May 2, 2022 Report Posted May 2, 2022 Some pilots mice like Bose, some don’t… Apparently the automotive community has an answer…. Honda has a pepper infused tape to guard wires…. https://www.hondapartsnow.com/genuine/honda~tape~rodent~19mm~20m~4019-2317.html So… if you see selectively cut wires… their insulation may be soy based… I went hunting for information about some Corvette wires and mice nests…. And came across similar information… Best regards, -a- 1 Quote
Mcstealth Posted May 3, 2022 Report Posted May 3, 2022 6 hours ago, LANCECASPER said: FOLLOW UP: Mooney Service Service finds evidence of uninvited passengers They found some rodent droppings and nesting. After it was cleaned up in the tail cone and cabin, no corrosion, thank goodness. What is very strange is that they chewed up only the Bose ground and power (black and red) wires. They gnawed into a little of the white insulation on intercom wires but didn't like that. If I had to guess those black and red wires were insulated with soy based insulation. (Mercedes used this on their wiring harnesses in the early 90's to be more environmentally friendly and rodents loved it. Tens of thousands of harnesses had to be replaced. Other companies have had to deal with this as well: https://nhoilundercoating.com/soy-based-wiring-how-to-help-keep-mice-out/) Do you think they preferred LOP, or ROP operations? Good job finding the issue. Congrats to that tech. Quote
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