This is a serious situation for a newbie. Perhaps, it is all too simple for the experts in the forum. (I hope!)

At the very outset, this mail is not about pointing fingers at anyone. In fact, at this very moment, the seller of this set is corresponding with me and trying to help me out. 

I purchased a used Tx and Rx unit (Pics attached). Though the Tx said '6 Channel', the seller informed me that I would be actually buying a 4 Ch Tx. I went ahead with the deal. The set arrived and after nearly 2 months, I decided to test it out. To my horror, there is absolutely no response from the Rx / servos.

I am sure that I am doing something wrong, so I am now requesting knowledgeable forum members to let me know where I am at fault.

1. Why is 'A' broken / missing? What could be the cause of that?
2. When I connect a 7.2 Volt Battery pack to 'C', the Green light at 'B' (Gain) keeps blinking. Why does this happen? Is my battery pack of the right specs? Am I connecting it at the right place? 7.2V/750mah is what I am using. When I flick the controls of the Tx, the servos connected to Ch 1,2,4,5,6 (3 is broken/missing) don't respond at all.
3. I have connected the servos to another 6 Ch Tx /Rx and they are functioning fine.
4. Where does 'D' get connected to? The ESC?
5. What is Set Up Adjustment all about?

I am aware that I am a newbie, however, if I could get the 6 Ch set to function perfectly, where am I going wrong with this set?

Please advise.

Cheers!

VC

Just for yr info, in the picture 'rx2', the two slots above "C" are marked as M1 and M2. That would be Mode 1 and Mode 2, I presume. Am I supposed to connect something out there?

Your 'A' is not broken/missing infact the long extension is the A connection which you correctly suggested is the ESC connection. If your connection's are not working then you may have to check up with a multimeter to measure the electricity passing through the channels. if you don't get any reading that means your Rx is dead.

rgrds,
SUMIT.

Can you specify the battery you r using Ni-mh, Ni-cd, Li-po, Li-ion?
You r right, that M1 and M2 r modes.
If you want to more about modes visit this-
http://www.rcindia.org/chatter-zone/mode-1-or-mode-2-pinch-or-thumb/

I am using 1.2 Volts X 6 = 7.2 Volts Ni Cd batteries. What I need to know is that am I keeping any loops open so that the circuit is not being completed? Do I need to plug something in to ensure that it works? Thanks for your inputs. What goes into the m1 and m2 slots?

VC

Looks like this came out a heli (because of the "gain" part). See if you can find it online. I found the receiver, but no manual for it (as it has been phased out already). 

I also feel that people should be careful when buying such items. Unless the seller himself has got it to work outside the heli (he is at an advantage, as he could refer back to how it was wired up inside the heli), it is best to stay away from these "all-in-one" units.

Absolutely agree with Anwar...

Looks like its all-in-one unit. Gyro + ESC + Reciever. Gain means it surely has an onboard Piezo Gyro.

I personally would stay away from such units.

Did you contact the seller? what was the response?

Lets leave the seller out of this now. I will deal with that aspect later. Tell me guys, is it possible to salvage ANYTHING out of this, or is the whole deal a dead loss? Can the Tx be used?

Tx says " 72.830". Can this unit be used with other Rx's ? I presume if the new Rx units are of 72 MHz and I use matching Crystals, it should work (assuming the Tx is not busted too!). Am I right?

Thanks.

hmm.. point how does one determine whether the Tx or Rx is the issue? Got someone nearby with a 72Mhz set?

Your best option is to try a Corona synthesized shift-agnostic receiver.  If the TX itself has an issue, then all bets are off !

I have a 6 Channel FM 72 MHz (72.870) Tx and Rx. This unit works fine. The Crystals were switched from this Tx to the Cyclone Tx. Guess what? Still no go! Dead as a door nail. Tried this Tx with the Cyclone Rx and the Cyclone Tx with the other Rx - still no use! 

Now what?

Here you go..Hope this is the right link..Please confirm with other members..

http://hobbycity.com/hobbyking/store/uh_viewItem.asp?idProduct=7527&Product_Name=Corona_Synthesized_Dual-Conv_Receiver_6Ch_72Mhz

I am not very experienced on this, but if you have 2 sets of 72Mhz and one works, then your have one set working.

Now as per logic, if you use the working Tx with the doubtful Rx and it does not work then the problem is with the Rx. If the working Rx is used with the other Tx and the set does not work, then the problem is with the Tx.

If both the above conditions hold true, then both of them are bad.... but like I said, I am also a newbie into this.

Pankaj

Now how many people think like Pankaj? I, for one, do agree with him. Please note that one unit is 72.830 and the other is 72.870. That shouldn't be a problem, should it?
Please let me know what you all think, then I will know what to do.
This is getting serious now.

Thanks.

You cannot  use  any crystal with  any TX Rx combo unless the manufacturer is the same.
Because of these issues :

1) You have to check if the pair is single or dual conversion
2) The shift system also has to match between the tx , rx and the crystals
3) Tx  and Rx  crystals  also need to be the same freq. and  same type as far a 1 and 2 above are concerned

Eg you cannot use futaba crystals on JR and Vice versa

Having  said that most Chinese radios follow the same shift as futaba.

Synthesized receivers like Carona are  shift-agnostic  which means they  over come point no. 2 above  but point 1 above needs to be taken into account .

So work these factors out for your need.

sai

 
Mr. Sai seems to have forgotten that he is speaking to an RC Idiot!

Thanks everybody for atleast trying to help. This seems to be getting more and more convoluted by the moment. Let's see what else the forum has to add.

I refuse to believe that I have been taken for a ride by the seller. There must be a genuine mistake on my part somewhere. I am sure I am doing something wrong. One way or the other, I'm going to get to the bottom of this.

Single or dual conversion is entirely at the receiver end, so any "synthesized shift-agnostic" receiver should not have any trouble with "point 1".  There is no distinction about single or dual conversion at the TX side, so such a receiver will work regardless of whether it is a single conversion or dual conversion.

I don't  know why Carona Specify the synthesized  receivers to be dual conversion  they might as well say single and dual conversion OR Conversion - agnostic  as well.

BTW  they also have single conversion receivers with crystal .

So if the Synth receiver could take care of all these then why do they have single conversion  ones at all 

You may be right I don't know.

All I was trying to say is all these factors have to  be compatible to the tx and rx to work.
 

The separate dual and single conversion models exist in the Corona world for the same reason they exist in the Futaba world.  The dual conversion ones "are supposed to be better ".  (Technical details on the link here : http://www.rcindia.org/radios-and-receivers/fm-receiver-choices/msg11772/#msg11772)

Many people consider that this is just a marketing plot to extract more money from all of us   The fact that JR has no concept of dual-conversion is often pointed out to demonstrate that the advantages of dual conversion are not significant.

VC ,
Not much of gyan is needed just check if these factors tally .
Might be difficult to get this info for the Chinese radios I know but  that is the only way to get them to work.
I can assure you it is not  rocket science but just methodical  checking.

Sai Sir,

All this is Greek to me! I have contacted an expert aero/RC modeller from Assam. If he can't sort it out, I am going to send the entire set to you...... Have a look at it and let me know if there is any hope for it, if not,  I will send it back to the seller and claim a refund. I hope he is reading this now............ >

Just your bad luck Mr. Sai, who asked you to be helpful? 

Just joking Sir, thanks a ton for trying to help. I am giving up this set as a bad joke.

Just made up this one, 'A Cheap horse is as good as a Dead Mule'. (My Original idiom!)

Cheers!

VC - Damn! Why do I have to be the sucker EVERY time?!

Seems another argument for opting for a 2.4 GHz set

Pankaj

I think the supply to the Rx will come through D and not C , you can also connect a 4.8V directly at the servo outputs, you need to identify which pin is positive and wich pin is negative this help you can get from the servo leads or may be given on the Rx case. To me C is the power supply for M1 and M2 which may not be giving supply to Rx.
Are you connecting the servo leads in the right way?

Jitender

Synthesised receiver - like Xtal controlled ones - can be single or dual conversion. Hence the specification. Dual conversion receivers are better at rejecting adjacent channel signals and can - theoretically - allow 10 kHz spacing between channels.

VC, please ignore the above!!