Normally if the power section components are damaged you will see a burnt mark on the p c b(printed ciurcuit board). rather than haveing it repaired(which can be very costly,id recomend getting a new unit,that is if its a cheap one. if its a more expensive unit then see how much it is to repair but be prepared to pay a fair bit to get it done.
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If it does blows off fuse; as soon as it is switched ON; either its mains rectifier section circuit; or its audio output section circuit will have any kind of short circuit. Contact any service technician. Your set need a though check-up. Never insert a fuse, and check further; till the fault has been rectified. It might make things worse.
If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/
Check and replace damaged component/s at its main power amp section circuit. Contact any service technician. There is shorted component/s at that section circuit. Never switch it ON; without rectifying this problem. It might make more damage to the set. If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/
If fuses blow, there must be a shortage. Could be your speaker cables are damaged, or perhaps if there is an electrolytic capacitor in the end stage it is defect. Also the last transistors in the end stage can be damaged.
Start with checking your speakers and speaker cables. Then check the end stage of the amp.
This uses a switching mode power supply, therefore you either have a bad capacitor, usually swollen or pushing out the top of it, or a shorted amp section holding down the vcc supply for the entire aamp section, Look for discolored resistors or exploded ones and i'll guarantee thats the section with shorted parts.. The protection low or yellow light is telling you that you have a protection problem and keeps from failing more electronic components! which leads to catostrophic failure. let me know what you find. Experttech SAM
Well it seems to me that the pictures of this amp show green ATC fuses which would be 30 amp fuses. What is your inline fuse from the battery? 40 amp fuses for the amp is too much current for the amps powersupply. If there was a short in the powersupply the max ammount of current that it could draw would be larger than designed to handle therefore damaging the amp.
Do you get sound if you set it on full? If you don't get sound in any way it maybe broked. Do you smell burnt components? Is the protection light on? If so you probably have a shorted transistor inside. If everything looks normal but has no sound at all. The preamp circuit is probably not getting power due to a malfuctioning power supply circuit. The way a car amp works is it has a DC-DC converter, which steps up the 12 volts to two supply voltage. One is usually a -35V, an the other is +35V. To a totall of 70V. Power transistors don't operate efficiently on 12 volts thats why it is designed like that. A PWM (pulse width modulation) circuit which consist of a chip, and various components connected to it drives an array of Power FET(field effect transsitors) usually conected in parallel to add power. These FET drive two or more "powder iron core" transformer. The other side of the transformer is connected to large diodes, providing power to the transsistors that actually drive your speakers. The supply voltage to the section preamp section is usually the same as the battery voltage. This preamp section filter high frequency for things such as low pass, high pass etc, and through many stage of amplification using small transistor, the final stage is the large transistors that drive the speakers. If you can tell me more info I can help you with a step by step guide on fixing the amp.
if burned components are on output stage or amplifier section on board..Then look at the oposite side of amp..Both amplifier section should be a mirror image oof componentc from other..that way you can know the values of parts.If they are on power supply section ..Then you might need manual if available..