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Old 02-06-2011, 10:16 PM #1
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Default Dealing with diode disasters

If you build your own lasers sooner or later you will have to face a potential "diode disaster." Last night I faced my worst to date and thought I'd share how I got past it. So first some background.

In preparation for building my 12x in the next couple days I decided to extract the diode from my 12x BDR-S06J sled. The extraction went super smooth. The heatsinked diode popped right off the sled with only a little prying from the side. Next using the solder blob method the ribbon came off instantly. I've never had one come off that easily. Finally it was time to free it from the factory heatsink. The heatsink is a lot like that of the PHR-803t in that it's soft enough that you can grab it with two pairs of pliers and with a gentle twisting motion snap it in a minute or so. Then I noticed it. The positive pin was bent completely over touching the back of the with the tip of it bent slightly upward. Ah *^$%*) now what do you do? Well this is what I did.

1. Calm the hell down. Step away from the work area. Get a soda, have a smoke, get some nookie or whatever. Stop what you're doing because you're likely fuming that you just more than likely ruined, in my case, a $52 diode and anything you do will likely make things worse.

2. Assess the situation and figure out your options. In my case the best outcome would be that I could carefully bend the pin back enough that I can press the diode into a module. The worst case is the pin snaps off and then what? After thinking about that for a minute I realized all hope was not lost. Since the host I'll be using has a former driver board where the leads to the microboost will be soldered to I realized I could bridge the positive connection to the case making the diode case pin positive since I don't need it to feed the batt- input. The module would have to be isolated from the heatsink to prevent shorting. A couple wraps of tape should do if you don't have any of the specific tape like you see in laptops for example. Just make sure the setscrew doesn't punch through whatever insulation you used.

3. Take you time in whatever option you choose. I decided to try bending the pin back first and slowly bent it back to a position where I thought the pins would fit through the back of the aixiz module and into my diode press. Luckily it fit both fine and I was able to press it without issue. I decided not to press my luck any further and straighten the pin anymore since everything fit fine. Crisis averted.

Sorry for rambling but I've seen several posts recently along the lines of "HELP! Is it dead/fixable/salvageable/whatever" and thought I'd share one method of working through a potential problem. We all know this hobby comes with the risk that you may ruin a pricey diode. It's just one that nobody ever wants to face but sometimes it just happens.


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Old 02-06-2011, 11:39 PM #2
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Default Re: Dealing with diode disasters

Quote:
Originally Posted by LtKernelPanic View Post
If you build your own lasers sooner or later you will have to face a potential "diode disaster." Last night I faced my worst to date and thought I'd share how I got past it. So first some background.

In preparation for building my 12x in the next couple days I decided to extract the diode from my 12x BDR-S06J sled. The extraction went super smooth. The heatsinked diode popped right off the sled with only a little prying from the side. Next using the solder blob method the ribbon came off instantly. I've never had one come off that easily. Finally it was time to free it from the factory heatsink. The heatsink is a lot like that of the PHR-803t in that it's soft enough that you can grab it with two pairs of pliers and with a gentle twisting motion snap it in a minute or so. Then I noticed it. The positive pin was bent completely over touching the back of the with the tip of it bent slightly upward. Ah *^$%*) now what do you do? Well this is what I did.

1. Calm the hell down. Step away from the work area. Get a soda, have a smoke, get some nookie or whatever. Stop what you're doing because you're likely fuming that you just more than likely ruined, in my case, a $52 diode and anything you do will likely make things worse.

2. Assess the situation and figure out your options. In my case the best outcome would be that I could carefully bend the pin back enough that I can press the diode into a module. The worst case is the pin snaps off and then what? After thinking about that for a minute I realized all hope was not lost. Since the host I'll be using has a former driver board where the leads to the microboost will be soldered to I realized I could bridge the positive connection to the case making the diode case pin positive since I don't need it to feed the batt- input. The module would have to be isolated from the heatsink to prevent shorting. A couple wraps of tape should do if you don't have any of the specific tape like you see in laptops for example. Just make sure the setscrew doesn't punch through whatever insulation you used.

3. Take you time in whatever option you choose. I decided to try bending the pin back first and slowly bent it back to a position where I thought the pins would fit through the back of the aixiz module and into my diode press. Luckily it fit both fine and I was able to press it without issue. I decided not to press my luck any further and straighten the pin anymore since everything fit fine. Crisis averted.

Sorry for rambling but I've seen several posts recently along the lines of "HELP! Is it dead/fixable/salvageable/whatever" and thought I'd share one method of working through a potential problem. We all know this hobby comes with the risk that you may ruin a pricey diode. It's just one that nobody ever wants to face but sometimes it just happens.
Don't be sorry for rambling, it was good that you assessed the situation, and listed potential solutions for others to benefit from.
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Old 02-07-2011, 12:45 AM #3
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Default Re: Dealing with diode disasters

so your diode made it?

I just grab the pin and bend that bastard back where i want em.
You just have to make sure your bending the pin, instead of spinning it when you apply the pressure......
if your not careful you'll actually spin the pin in it's place instead of bend it, which will actually wrap up the wires that go from the pin to the die.
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Old 02-07-2011, 01:49 AM #4
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Default Re: Dealing with diode disasters

Whoops. I thought I mentioned that I set up my usual DDL test driver at 125ma and it lit up fine. I forgot to add this pic too.


2011-02-06_07-02-12pm by ltkernelpanic, on Flickr

The part of the pin that's at about a 45 degree angle was flat against the back of the can. Those pins are pretty thick compared to those of a 635 diode I snapped off. I still didn't want to bend it anymore than I needed to after that much bending. I'm surprised it didn't snap off when it got bent. I suspect I caught it with my needle nose pliers when flexing the heatsink.
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Old 02-08-2011, 04:26 AM #5
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Default Re: Dealing with diode disasters

HI.
I recently got my 405 nm GGW diode from hightechdealz (pre pressed), and i was surprised when i checked out the pins. I freaked. Basically, they are ridiculously short, covered in solder, and all bridged together. I need to hook it up to a microdrive and thus need a way of surgically cutting down the ground pin; but thats beside the point. I need someone's opinion on how i should even try and rescue this diode, I'm decent at soldering, but the solder all over the pins looks cracked, old, and way hard to get off. It would be sure to die if i attempted to wick or suck it. any tips? advice? insults? should i contact HTD? i am sad and need help. here are some photos:
imgur: the simple image sharer
imgur: the simple image sharer
it is worse than it looks. i took angles of the good side
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Old 02-08-2011, 04:34 AM #6
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Default Re: Dealing with diode disasters

Put flux on the pins, and with a small blob of solder on your iron contact both pins toward the bottom and pull up sliding up the pins. Do this quick,, If 1st try fails wait for diode to cool them try again. solder wick will probably stick, and cause more heating then necessary.

Good Luck
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Old 02-08-2011, 05:08 AM #7
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Default Re: Dealing with diode disasters

I seriously hope that crud on the pins will melt/drag off. 610f seems like a good risk for that
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Old 02-08-2011, 10:28 PM #8
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Default Re: Dealing with diode disasters

If it was me I'd put a little flux on the pins, crank my iron up to about 700f or so and quickly run it up the pins. Personally I prefer to use a little hotter iron with less time on the pins. Like CL says if it doesn't come right off the first time let the diode cool for a bit first before trying again. FWIW the pins on one of my diodes (I think my 6x SF AW-210) were pretty short too. They either come that way from the factory or the drive manufacturers trim them when they put then in the sleds.
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Old 02-08-2011, 10:33 PM #9
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Default Re: Dealing with diode disasters

The pins aren't THAT delicate. It's not like they're made of glass.

Just take a pair of needlenose pliers and carefully bend (NOT TWIST) it back. It's not going to snap on you.
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Old 02-09-2011, 12:21 AM #10
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Default Re: Dealing with diode disasters

Thanks LtKernel. I'll give it a lil' more heat and hope for teh best. Hopefully i can get around to it this thursday.
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Old 02-09-2011, 02:10 AM #11
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Default Re: Dealing with diode disasters

Kev-

Some will say that's too hot and you should keep it around 650 but as a few others have said as well I think the "hot and fast" method works better. I found at around 600 I had to hold the iron on the pin for a second or two to make the connection but at ~700 with pre-tinned and fluxed wire with a tiny bit on solder on the tip of my iron I could just tap it and it'd make a nice strong joint.

Quote:
Originally Posted by JimBolder View Post
The pins aren't THAT delicate. It's not like they're made of glass.

Just take a pair of needlenose pliers and carefully bend (NOT TWIST) it back. It's not going to snap on you.
You're right on that particular diode they're not. On the 635 diode I ruined they're less than half that thickness. My point was is when you're pissed at yourself for potentially ruining an expensive diode is that rushing in and trying to "fix" it will likely lead to more problems. Taking five minutes to calm down and assess the situation to keep from making things worse is time well spent.
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Old 02-09-2011, 02:23 PM #12
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Default Re: Dealing with diode disasters

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Originally Posted by JimBolder View Post
The pins aren't THAT delicate. It's not like they're made of glass.

Just take a pair of needlenose pliers and carefully bend (NOT TWIST) it back. It's not going to snap on you.
Diode pins are like some women. If you ask them to bend too much, they'll snap on ya. Some of us are more assertive with our pins (Mohrenburg), and simply force them to do their bidding.
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Old 02-10-2011, 01:05 AM #13
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Default Re: Dealing with diode disasters

UPDATE: i used the "blob suck" method like 5 minutes ago, running at 705f, and it worked perfectly. absolutely perfectly. diode works, pins are shiny clean (but still ridiculously short), and i have a smile on my face

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