CJ MF2500 fault - smoke
Posted: Wed Apr 19, 2017 5:26 pm
Hi, have had this for a while but have never tried it
Anyway - replaced all fuses (3 were blown) just to test. On fuse on the back and 2 on the pcb.
Connected a DMM on each loudspeaker terminal and fired up.
Left channel showd 72Vdc - Right channel ~100mV.
After some seconds a bit of smoke appeared somewhere on the board.
It is late here now and bed time... I will take some pictures on a later occasion.
Any initial typical faults that I could be aware of? Blown transistors maybe?
Looks as one or two resistors are blown but I guess it is a reason why that has happened?
I know this is not much to go after....
Some pictures.
First is a overview of the amp.
Second is the area which I saw smoke. However I cannot visually see a problem there.
Third I noticed afterwards that what seems as a cap or resistor has been toast.
I will take everything apart on a later occation. CJ wasalso kind enough providing me with schematic.
Anyway - replaced all fuses (3 were blown) just to test. On fuse on the back and 2 on the pcb.
Connected a DMM on each loudspeaker terminal and fired up.
Left channel showd 72Vdc - Right channel ~100mV.
After some seconds a bit of smoke appeared somewhere on the board.
It is late here now and bed time... I will take some pictures on a later occasion.
Any initial typical faults that I could be aware of? Blown transistors maybe?
Looks as one or two resistors are blown but I guess it is a reason why that has happened?
I know this is not much to go after....
Some pictures.
First is a overview of the amp.
Second is the area which I saw smoke. However I cannot visually see a problem there.
Third I noticed afterwards that what seems as a cap or resistor has been toast.
I will take everything apart on a later occation. CJ wasalso kind enough providing me with schematic.