If the back of the case is being opened up to replace components then it is the SMT parts mounted on the back of the board. If someone knows the location then the the photos that I took of the back of the board will show the likely candidates.
I took all of the caps off and measured them on a bridge so I know the values. I don't know the voltage ratings but the package size is a reasonable guide. The BOM contains my best guess at some of the parts. The FN indicates a Farnell Components part number.
If anyone needs any further info I have CAD files in Proteus format but I can create Gerber files for the layout if someone wants to make a new board. I have found a cheap source of the connectors if they are needed too.
De-potting the whole board is very time consuming but using something like a Dremell to cut a window in the case and then just remove the potting from that area is far more practical. The components can then be replaced and the hole repotted to finish the job. Given the nature of the repair it needs to be done by someone who has worked on SMT boards otherwise the repair will not be reliable.
I have suitable equipment at work and I am happy to replace components if someone can identify what needs to be changed. I can carry out the work for free on the understanding that the unit is to be used for test purposes only.
That's great, Kevin. thanks for sharing that, I see you've put a lot of effort into it!
So we know that it's possible to repair these units without removing any potting - by doing something on the back. What that is yet I don't know, but pilots here who've been using the Carmo guys in the Netherlands have been happy with the repair and reporting things are all ok.
That said, they still charge quite a lot for their secret :-) there seems to be a magic fix though.
rgds
Andy
Sounds like it's time to share...
I think a collaborative effort is needed to resolve this expensive problem.
I have done some work already but run out of time to do any more at the moment.
Here is a link to some of the information that I have:
If the back of the case is being opened up to replace components then it is the SMT parts mounted on the back of the board. If someone knows the location then the the photos that I took of the back of the board will show the likely candidates.
I took all of the caps off and measured them on a bridge so I know the values. I don't know the voltage ratings but the package size is a reasonable guide. The BOM contains my best guess at some of the parts. The FN indicates a Farnell Components part number.
If anyone needs any further info I have CAD files in Proteus format but I can create Gerber files for the layout if someone wants to make a new board. I have found a cheap source of the connectors if they are needed too.
De-potting the whole board is very time consuming but using something like a Dremell to cut a window in the case and then just remove the potting from that area is far more practical. The components can then be replaced and the hole repotted to finish the job. Given the nature of the repair it needs to be done by someone who has worked on SMT boards otherwise the repair will not be reliable.
I have suitable equipment at work and I am happy to replace components if someone can identify what needs to be changed. I can carry out the work for free on the understanding that the unit is to be used for test purposes only.
I thought it might be the 47uF electrolytics, going off with the heat/vibes - maybe a ceramic cap on the back there to parallel with the pads for this component might help the trigger cct. Not sure if it's the trigger circuit not triggering, or if it's just lack of energy being delivered from the main storage cap.
The 2uF large cap seems to die. I have found them as low as .5uf and regularly down at 1 and 1.3uF. This is the first place I would start as you cant get enough energy for the firing.
This website uses cookies to manage authentication, navigation, and other functions. By using our website, you agree that we can place these types of cookies on your device.
You have declined cookies. This decision can be reversed.
You have allowed cookies to be placed on your computer. This decision can be reversed.
Login
This website uses cookies to manage authentication, navigation, and other functions. By using our website, you agree that we can place these types of cookies on your device.
