Hey Guys!
I need some help locating a problem within a DJ mixer. I recently posted in this forum regarding a problem with the same type of DJ mixer and was actually able to resolve the problem completely. I'm hoping for good luck again! The problem is different than the last but hopefully you guys can lead me in the correct direction of solving it. Generally, the mixer itself will not power up and does not turn on (no lights). The individual PCB's inside the mixer seem to be receiving power as I tested some voltage points and I'm receiving positive readings. I have the full service manual which includes schematics and will post that below. I will also link to my old thread regarding the same mixer if that will be of any help (there are pictures and such of the boards there). I will also be testing the SMD fuses on the boards just to make sure none of them are open and to ensure there are no shorts. I'll post the readings here once I'm done. Thanks guys!
Service Manual/Schematics: http://www44.zippyshare.com/v/50017572/file.html
Old Thread: http://forum.allaboutcircuits.com/showthread.php?t=87064
EDIT: Might have found a problem. Can someone clarify? There are 11 or so SMD fuses within the mixer that if blow may cause this problem. If you reference page 101 on the schematic, you can see IC43 which I believe is a blown fuse. Now when I measure it, I get one side of the fuse with a value of ~3.3V and the other side with a zero value. Is this normal for a fuse or does this mean it's blown? When measuring all other SMD fuses I get readings on both sides and never a zero. Also, right above this fuse there is a measuring point that should be 3.3V but I'm also getting a zero reading there as well as some more measuring points directly above this. Referencing the schematic again on page 101, the measuring points I discussed are specifically to the direct left of R367 (V3R3 where I get a 0.00V reading), to the left of R255 (V+33 where I get a 0.01V reading), above C114 (V2R5 where I get 0.0V) and to the right of this at V1R2 where I also get 0.0V. These are obviously not the correct readings. Anyone care to comment on this? Thanks again guys.
I need some help locating a problem within a DJ mixer. I recently posted in this forum regarding a problem with the same type of DJ mixer and was actually able to resolve the problem completely. I'm hoping for good luck again! The problem is different than the last but hopefully you guys can lead me in the correct direction of solving it. Generally, the mixer itself will not power up and does not turn on (no lights). The individual PCB's inside the mixer seem to be receiving power as I tested some voltage points and I'm receiving positive readings. I have the full service manual which includes schematics and will post that below. I will also link to my old thread regarding the same mixer if that will be of any help (there are pictures and such of the boards there). I will also be testing the SMD fuses on the boards just to make sure none of them are open and to ensure there are no shorts. I'll post the readings here once I'm done. Thanks guys!
Service Manual/Schematics: http://www44.zippyshare.com/v/50017572/file.html
Old Thread: http://forum.allaboutcircuits.com/showthread.php?t=87064
EDIT: Might have found a problem. Can someone clarify? There are 11 or so SMD fuses within the mixer that if blow may cause this problem. If you reference page 101 on the schematic, you can see IC43 which I believe is a blown fuse. Now when I measure it, I get one side of the fuse with a value of ~3.3V and the other side with a zero value. Is this normal for a fuse or does this mean it's blown? When measuring all other SMD fuses I get readings on both sides and never a zero. Also, right above this fuse there is a measuring point that should be 3.3V but I'm also getting a zero reading there as well as some more measuring points directly above this. Referencing the schematic again on page 101, the measuring points I discussed are specifically to the direct left of R367 (V3R3 where I get a 0.00V reading), to the left of R255 (V+33 where I get a 0.01V reading), above C114 (V2R5 where I get 0.0V) and to the right of this at V1R2 where I also get 0.0V. These are obviously not the correct readings. Anyone care to comment on this? Thanks again guys.
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