- Joined
- Jan 14, 2015
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I bought a NDB7875 from DTR a couple of weeks ago. I am using it for laser engraving. I needed the extra power over my M140 to speed up some of my engravings. 7875 is the 3w everyone else seems to use because of it's relatively low divergence for a 3w / 9mm. Emblazer (laserblade) uses them as well as the guys over at picengrave.
I have done some preliminary photo engravings (Full Analog Engravings) trying to figure out speeds and was trying to get it aimed. I have maybe a half hour of run time. So the next day I haven't run it but about 3 or 4 minutes. I go to run some full power lines. The second it goes to full power it just winks out. No bright flash, no blue led, just black.... So I removed the 12mm module from the heat sink and tried to look at the laser module with my usb microscope. I don't have any way of removing the diode from the module or removing the cap off the diode. I didn't see any black or charred wires, or anything on the glass but without removing the cap it doesn't mean a whole lot. When I checked the diode with my meter it is measuring infinity.
I have double checked everything. I am using a flexmod p3 for a driver. I had it set for 2.3A Max. I am powering it with a 12v / 5A regulated power supply. I am using the z-bolt heat sink with a fan mounted to the top of it and blowing through through it and 3 other fans blowing down it inside of a wind tunnel. The Z-bolt is also mounted to a 1/4" piece of steel with cpu grease between the module and z-bolt as well as the z-bolt and piece of steel. You can see it here. It shouldn't be ESD because I wasn't touching the frame or anything else when it happened. It was also fairly humid.
Anyone got any ideas??
I have done some preliminary photo engravings (Full Analog Engravings) trying to figure out speeds and was trying to get it aimed. I have maybe a half hour of run time. So the next day I haven't run it but about 3 or 4 minutes. I go to run some full power lines. The second it goes to full power it just winks out. No bright flash, no blue led, just black.... So I removed the 12mm module from the heat sink and tried to look at the laser module with my usb microscope. I don't have any way of removing the diode from the module or removing the cap off the diode. I didn't see any black or charred wires, or anything on the glass but without removing the cap it doesn't mean a whole lot. When I checked the diode with my meter it is measuring infinity.
I have double checked everything. I am using a flexmod p3 for a driver. I had it set for 2.3A Max. I am powering it with a 12v / 5A regulated power supply. I am using the z-bolt heat sink with a fan mounted to the top of it and blowing through through it and 3 other fans blowing down it inside of a wind tunnel. The Z-bolt is also mounted to a 1/4" piece of steel with cpu grease between the module and z-bolt as well as the z-bolt and piece of steel. You can see it here. It shouldn't be ESD because I wasn't touching the frame or anything else when it happened. It was also fairly humid.
Anyone got any ideas??