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Model Forum / Radio Controlled / Helicopters / March 2007Is it normal for DX7 to buzz?
I shorted it out earlier today and burned the glass fuse and now I can hear it buzz in a quiet room. Is that normal or did something else go besides the fuse? Have you checked under your floorboards for a bee's nest,or if it is a higher pitched buzzing it could be the lesser spotted african bomb diffuser wasp. please let me know as i am an avid collector of Bee and Wasp sh.t. >I shorted it out earlier today and burned the glass fuse and now I can hear > it buzz in a quiet room. Is that normal or did something else go besides > the fuse? >I shorted it out earlier today I've got to ask, HOW did you short out a transmitter? I mean, it's pretty obvious you're not altogether the most clued up user of a transmitter, so what posessed you to open it up and play with its innards? and burned the glass fuse and now I can hear > it buzz in a quiet room. The normal response to this would be "Move to a noisier room", but you're a noob, so I'll give you a break and say "Your Tx is very likely f.cked". Is that normal or did something else go besides > the fuse? Whatever caused the fuse to blow in the first place. That's usually bollocksed.  SignatureBeav VN 750 Zed 1000 OMF# 19 >>I shorted it out earlier today > > I've got to ask, HOW did you short out a transmitter? I mean, it's pretty > obvious you're not altogether the most clued up user of a transmitter, so > what posessed you to open it up and play with its innards? Trainer cable had shorted wires. > Trainer cable had shorted wires. Ooooopppsssss! That probably has caused some damage, usually they are connected straight to the encoder so you might be putting out a dead signal across the airwaves from your TX. You might be lucky and Spektrum put a buffer/isolator circuit in to prevent exactly this sort of thing happening. Your best bet is to contact the Spectrum agents in whichever country you are in and tell them which cable you used (I'm guessing NOT a Spektrum buddy cable from your description of the short) to connect which other make of TX and ask them what the probable damage is. I would bet that they tell you to send it in for service and see if they can repair it. Then again you could be lucky and only the power connectors shorted out and that's the only reason the fuse blew. So beg or borrow a servo from a friend and test the Tx and RX together plugging the servo into each socket on the RX one at a time and see what response you get. Chris >> Trainer cable had shorted wires. > > Ooooopppsssss! That probably has caused some damage, usually they are > connected straight to the encoder so you might be putting out a dead signal > across the airwaves from your TX. You might be lucky and Spektrum put a > buffer/isolator circuit in to prevent exactly this sort of thing happening. I got a new cable and the simulator works perfectly. Considering that is the damage you are describing above still likely? > Then again you could be lucky and only the power connectors shorted out and > that's the only reason the fuse blew. So beg or borrow a servo from a friend > and test the Tx and RX together plugging the servo into each socket on the > RX one at a time and see what response you get. Will do. >>> Trainer cable had shorted wires. >> [quoted text clipped - 12 lines] > > Will do. By the way I did not connect DX7 to some other transmitter but to the computer. It was a standard audio cable with two 3.5mm mono jacks on each side, but unfrotunately the wires were shorted. I got the same cable that wasn't shorted and as I said above simulator works fine. > By the way I did not connect DX7 to some other transmitter but to the > computer. It was a standard audio cable with two 3.5mm mono jacks on each > side, but unfrotunately the wires were shorted. I got the same cable that > wasn't shorted and as I said above simulator works fine. Well even if the simulator works fine after replacing the fuse you won't know if the RF section of the TX is working properly unless you test it with an RX, battery and servo. The trainer socket is wired between the encoder and the RF section of every TX. Just test the TX and RX together one channel at a time and take your next step from the results of that. i.e. if they all work do a range check as Beav suggests: glue a stick of wood (about 10cm long) to a servo horn and fix the servo upright with something like Bluetak then walk away to do your range check. Check for proper non glitchy operation of the servo as you go. Of course the range check is pretty useless if you never did it when the gear was brand new; you won't know what it was before it was damaged so how can you tell if it has been reduced after the damage? Chris > Of course the range check is pretty useless if you never did it when the > gear was brand new; you won't know what it was before it was damaged so how > can you tell if it has been reduced after the damage? Well if the range test is within the specs (90 feet or more with reduced range as it says in the manual) then I should be fine no? > Well if the range test is within the specs (90 feet or more with reduced > range as it says in the manual) then I should be fine no? Well it should be ok, BUT if you are at all concerned about the range or functionality after it passes a basic test with you then send it in for service. Personally I wouldn't trust it until I had sent it in and got a clean bill of health from the agents, would you? The last thing you want is for you to get to the field one morning, crank the heli up and find the TX and RX are not talking to one another.. especially if the happens midflight or at any time after you start the engine! Best case scenario: it sits on the bench refusing to respond to the TX, worst case scenario.... Chris >>>I shorted it out earlier today >> [quoted text clipped - 3 lines] > > Trainer cable had shorted wires. Chances are you've not done anything serious then. The fuse should've protected the Tx, but a servo plugged in would tell you that instantly. SignatureBeav VN 750 Zed 1000 OMF# 19 "Beav" <beavis.original@ntlwoxorld.com> wrote in message news:%3BJh.287$F82.235@newsfe4- > Chances are you've not done anything serious then. The fuse should've > protected the Tx, but a servo plugged in would tell you that instantly. Ok I got a servo but the battery I bought isn't working. Can I safetly connect a single servo and a receiever to a 5V 2amp adapter, or can the two draw more than 2amps? > "Beav" <beavis.original@ntlwoxorld.com> wrote in message > news:%3BJh.287$F82.235@newsfe4- [quoted text clipped - 5 lines] > connect a single servo and a receiever to a 5V 2amp adapter, or can the two > draw more than 2amps? some adaptors are not regulated and they will only be 5v when the current is 2amps and on no-load can be a lot higher so be careful or you might need a new receiver and servo as well but 2 amps will be fine I thought I read somewhere that the Voltage regulator used in the TX buzz's..... >> "Beav" <beavis.original@ntlwoxorld.com> wrote in message >> news:%3BJh.287$F82.235@newsfe4- [quoted text clipped - 10 lines] >current is 2amps and on no-load can be a lot higher so be careful or >you might need a new receiver and servo as well but 2 amps will be fine SignaturePhil Olson Model Technics Ltd Http://www.modeltechnics.com My new DX7 has a slight "buzz" in it when I turn it on... >I thought I read somewhere that the Voltage regulator used in the TX >buzz's..... [quoted text clipped - 12 lines] >>is 2amps and on no-load can be a lot higher so be careful or you might >>need a new receiver and servo as well but 2 amps will be fine |
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