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Press Fitting Diodes

robjdixon

robjdixon

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I have recently been having some trouble press fitting diodes recently. I normally, take them out of their heatsink, and use the back of an aixiz module to press it in before removing the pcb with a blade.

The past couple of diodes have not gone in straight, and I began to wonder if I was doing it right. Recently, the back end of the modules have been bending when I tried to press it in. I use a vice. Should I be removing the PCB before trying to put the diode in, or is there something else?
 





laserwanabe

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I remove the PCB with a small screw driver, then use a slightly larger screw driver to press the diode into the head of the aixis module. It worked perfectly for me, you just place the flat head in the center of the diode and press it in with the vice.
 
rog8811

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There have been more and more people finding that the LD's are tight in the modules, I must say that I take the PCB's off before fitting the LD, then I can use a brake adjuster to do the job.

Regards rog8811
 

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daguin

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robjdixon said:
I have recently been having some trouble press fitting diodes recently. I normally, take them out of their heatsink, and use the back of an aixiz module to press it in before removing the pcb with a blade.

The past couple of diodes have not gone in straight, and I began to wonder if I was doing it right. Recently, the back end of the modules have been bending when I tried to press it in. I use a vice. [highlight]Should I be removing the PCB before trying to put the diode in[/highlight], or is there something else?
Click to expand...


:eek: YES :eek:

Leaving the PCB on puts pressure on the pins when pressing the diode into the module.

When I press the diode, I use a two step process. First I use the back of a module that has already "bent" in uniformly. The curvature of the module back plus the bevel of the diode recess helps the diode get started straight. Then I use my compressed air fitting to press the diode the rest of the way in. This helps me avoid the croocked placement and lets me get the diode recessed all the way safely.

Peace,
dave
 
robjdixon

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Is there an easy way to get the PCB off without soldering?
Also Daguin, How do you suggest that I get the PCB off of the diodes I bought from you that aren't in the heatsinks without putting pressure on the diode by holding it with pliers.
 
daguin

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robjdixon said:
Is there an easy way to get the PCB off without soldering?
Also Daguin, How do you suggest that I get the PCB off of [highlight]the diodes I bought from you[/highlight] that aren't in the heatsinks without putting pressure on the diode by holding it with pliers.
Click to expand...


[highlight]I[/highlight] sent you diodes "out of their heat sinks" with the PCB still attached?!? If "I" did that, I must have been really drunk that day :eek:

What? Wait.

I haven't been drunk for years.

I remove the PCB's and ribbon cables while the diode is still in its original heat sink.

Peace,
dave
 
rog8811

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If you have a pistol drill you can hold the diode lightly in the three jaw chuck for unsoldering.

Regards rog8811
 
robjdixon

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daguin said:
[quote author=robjdixon link=1232811382/0#4 date=1232814053]Is there an easy way to get the PCB off without soldering?
Also Daguin, How do you suggest that I get the PCB off of [highlight]the diodes I bought from you[/highlight] that aren't in the heatsinks without putting pressure on the diode by holding it with pliers.
Click to expand...


[highlight]I[/highlight] sent you diodes "out of their heat sinks" with the PCB still attached?!?  If "I" did that, I must have been really drunk that day  :eek:

What?  Wait.

I haven't been drunk for years.

I remove the PCB's and ribbon cables while the diode is still in its original heat sink.

Peace,
dave

[/quote]

I'll take a picture if you want. I bought 3 ps3 sleds from you before Xmas. The PP transaction number is 62N26850XN454951B.

Here is a quote from the thread:http://www.laserpointerforums.com/forums/YaBB.pl?num=1229341749

daguin said:
I have four of these diodes available. I used to build my lecture-type pointers with them, but I am using the SF-AD112 diode in them now. They are removed from the sleds, but if you need the PBS cubes and/or mirrors I can send some of them along. [highlight]They have been removed from the heat sink, but the ribbon cable is still attached. [/highlight]They are $8 each plus $3 shipping per order.

Peace,
dave
Click to expand...


Believe me now?
 
phoenix77

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The easiest way to press fit a diode into an AIXIZ module is to got to a local hardware or auto supply store & buy a Brass 1/4 " Barb X Barb Air Hose Splicer. This works GREAT with slip joint pliers & vice-grips, especially if cut in half. It also works well in a vice, or drill press. To REMOVE BAD diodes, visit the local police or public shooting range, where you should be able to pick up some .22 caliber rifle shells. These are thin enough to slip between the diode & module wall and strong enough to push the diode out with a light tap from a small tack hammer, or you can use the pliers, vice-grip, or vice method also. Cost for the Brass splicer=$1.20, & for the .22 caliber brass= FREE, just ask nicely ;)
 
robjdixon

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Phoenix77 - Do you have any spare rifle shells? Here in the UK, shooting ranges are few and far between



Thanks

Code: 
Edit: Thanks Rog - Ill have a look
 
daguin

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robjdixon said:
I'll take a picture if you want. I bought 3 ps3 sleds from you before Xmas. The PP transaction number is 62N26850XN454951B.
Here is a quote from the thread:http://www.laserpointerforums.com/forums/YaBB.pl?num=1229341749

Believe me now?
Click to expand...

:-[ Yes, I do.  I am sorry.  I had forgotten about the PS3 diodes.  I sold so few of them (and it seems like forever ago that we were using them) that I forgot   :-[

You are correct.  I used to treat the PS3's differently.  They were/are so vulnerable to heat damage that I avoided it completely.  Also, their heat sink was a pain in the ass. ;)

Here's how I used to work with them.  I cut the "extra pins" (red, IR, and PD) off of the PS3 with fine snips.  Then I cut the excess board away from the remaining pins.  Next, I would cut the remaining board into "sections" by cutting the board in toward the remaining pins (like slices of pie) with the snips.  Finally, I push the remaining pieces of the board down and loose from the solder on the remaining pins with the point of a knife.

Peace,
dave
 
V

Viracocha

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I found out the hard way that with Aixiz modules you need to remove the whole focusing section with the lens before trying to fit the diode, if you have the lens still attached and screwed up tight then the diode presses against the black plastic bit inside it and that stops it from going in.

Also, i tend to trim the circuit board so the end of the Aixiz module fits over it and presses against the diode, that way the diode has the heatsink of the module while i'm applying heat to get the board off.
 
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