I haven't changed the blades before, but after getting into this issue, I though that blade may be the reason for this problem and so I changes but after changing there was nothing different. Yes after switching on the Tx, the 4 in1 system shows solid green. Still I can say that I have not changed anything before this problem arise.

And I will be posting the closeup pics by removing the canopy by tonight, can you say "How can I find whether the" Linkages controlling the swashes are broken or not?"

Just went through the entire post... seems like anwar, gaurav and others have already walked you through the list of things that might be wrong.....  I will go home play with my lama try some scenario by unpluging servos and test.

Regarding the linkage: Basically they pop off on these helis just like the flybar. They dont break unless the crash is really hard. I will try positing some pics on tonight. But cant gurantee...

Also when u said u changed the blades. Even thought all 4 blades look similar the lower blades are different from upper blades. So please double check that u have not swapped them. 

I copied the picture for an on sale message. Verify that the linkage has not popped off. I have rounded the linkage in red. Not sure how visible the pic is...

I am sure that these linkages are fine...

While removing the OLD blades, I have marked them out so I can replace it to ensure that the blades are not interchanged.

And I will be posting the close up images removing the canopy by tonight once I reach home...

Dear Srihari, how hard was the crash, the linkages were fine when i sent them to u and as u yourself had mentioned u flew it once right, try sending more information with pics maybe i can see something amiss.sorry could not reply earlier as i was not in town

Vijay, When you send all where fine and good in condition and it flied well. A small crash, the heli fell down from 2 feet height that is the crash actually. I will post the close up pics by removing the canopy today...

Dear Srihari, good to hear it flew well, i am still waiting for the pictures, if any of ur friends are interested kindly refer my name as i still have the EC-135, Big Lama, Falcon 400 3D heli and belt cp heli fo e-sky.

Please check the close up pics and help me out to find the problem and to fix them to fly the heli.

more pics

some more pics goes here

Can anyone help me out to fix the problem with the above closeup pics?

If anyone can do it, Then I am ready to send it to you for fixing and then you just fix and resend, I will bear the shipping cost for them... Coz it is idle here...

Hi...looking at the pictures I do not see any physical damage to any of the servo linkage or the blades. Only other suspect is the 4-1in-1 controller....

 

Yes, I also, but one more thing that I suspect is the Shaft that connect the lower blade and the motor which is fixed on the frame through bearings, If there is struck in it then it would let the fuse to rotate right
?

And also, Shall I completely disassemble and then re-assemble the heli ? Is that right choice to fix this issue?

May be ...may be not... I still think the cause is the controller.
In co-axial heli the lift is generated by the rotation speed of the blades, as long as both sets of blades are spinning at exactly the same speed the heli can lift straight up.
The yaw is controlled in coaxial rc helicopters, by making one set of blades spin faster or slower then the other set.
So either the teeth of the rotary system might have been broken. From the image it looks fine... but check the inner rotary wheel.

the wheels are perfect and none of the teeth is broken.

And for you information, I have tried a experiment by removing the top blade set and run the heli, When I increase the throttle, the same happens - the fuse rotates. So the condition is same even after removing the top set of blades then what would be the suspect?

I think we have two option,
1. Shaft of the lower blade
2. 4 in 1

AM I RIGHT?

The fuse is suppose to rotate when one of the blades is not rotating or not present... that is the normal behaviour. It should basically rotate on the direction of the blades is rotating. So only other suspect is that the 4-in-1 contorller might be bad

 I have completely disassembled the heli to find the exact problem in it, And found that one teeth of the main wheel of lower blades axis is broken and rest are fine...

Is this is the only problem for the rotation of the fuse???

Please let me know as soon as possible.


Srihari

hi mate,
check that 'both the shafts' are straight and that the blade holder is a firm fix on the shaft......sometimes the top blade holder comes loose from the shaft......it this is so and it is the plastic one sometimes can be fixed with 'ca' glue....super glue.........the lower blade holder is fixed by the little screws......they go into holes in the shaft................. also check that the gears are fixed tight to the shaft... these are the things that cause your problem........
the contoler bad...usualy it stop one motor when bad.
your blades and servo conecters look fine to me......
one tooth missing ...you need new gear there realy, but should work, but may cause 'clicking; noise
 make sure the gear on the motors are firm also.
regards
don

Thanks don, The shaft has no bent at all... but the holder of the top blade is loose as you said, I am going to fix it by gluing it.

And for the wheel, I am not sure whether to get it but I think I can fix it using MSEAL and a nice file....

Thanks for your comment and waiting for more comments.

if you hunt around ebay.
seasrch for lama upgrades.....there is a ally top for that shaft with a grub screw fitting..........you could also then put a 15mm nonger shaft in to help with blade clashes.
http://shop.ebay.co.uk/?_from=R40&_trksid=p3907.m38.l1313&_nkw=lama+upgrades&_sacat=See-All-Categories
there seem to be none at ebay india but some from aisa may not be bad for you.......these all fit the robins etc, same basic heli but different frame set
regards
don

"blade holder is a firm fix on the shaft......sometimes the top blade holder comes loose from the shaft......it this is so and it is the plastic one sometimes can be fixed with 'ca' glue....super glue."

Was about to suggest this, as I had an identical problem with my Syma Scweizer 300. Since you had a minor crash, this is most probably the damage that is causing your fuse to turn and resulting in no take off. I CA'd my Blade holder to the shaft and all was well after that.

Shrikant, your infra red heli has probably lost a stabilising weight from the tips of the  blades that are mounted above the main prop. Use M seal to re create the weight and all should work well.

Btw, Sriharishine, you need to change that gear with a missing tooth.............

Cheers!

VC