I hooked this up to 12 volts reversed with no inline fuse. Pos. of amp to Neg. of battery. Any idea what needs to be replaced, besides the whole amp? I know a little about electronics so I can identify and replace whatever needs to be.
Sometimes it just blows out the large diode. (only if you are lucky) Then other times, it fry's the power supply trans. Then others, it burns a large hole in the board. Have seen this on the early style 225, 425,4100,280,ect... Just won't know till you get a meter inside the amp...
It's probably best if you remove the cover and post some pics of the insides. Closeups of the power supply section will help. The power supply side is the side with the toroid in it. It's a round wirewound transformer.
I know that it has an open circuit. When I check the pos to neg with an ohm meter, I get very little resistance. Now I have an inline fuse and if I hook it to 12V, correctly, it blows the fuse. Pictures of inside to follow.
Thanks, Dave
Thanks, Dave
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
Check the diodes (silver bodied and black bodied) in the power supply section of the amp. If any diode appears to be shorted in the board, pull it from the board to check it.
Try to read the numbers off it before removing it. If it's defective, it may break when you remove it.
Try to read the numbers off it before removing it. If it's defective, it may break when you remove it.
sorry if this is off topic but what are the differences between this amp and the 280gx amps? I have a couple of 280gx amps and the internals look exactly the same as this 225HCCA as far as I can tell.
"sorry if this is off topic but what are the differences between this amp and the 280gx amps? I have a couple of 280gx amps and the internals look exactly the same as this 225HCCA as far as I can tell."
The difference would be primarily the rail voltage. The transformer would have a higher turns ratio as well. The 225 HCCA digital reference series and the 275 SX have the same boards too. A couple folks on here have converted from an HCCA to SX and vise versa.
The difference would be primarily the rail voltage. The transformer would have a higher turns ratio as well. The 225 HCCA digital reference series and the 275 SX have the same boards too. A couple folks on here have converted from an HCCA to SX and vise versa.
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