hey guys someone gave me this dead amplifier its a 2000watts I dont remember the brand all I know its discontinued.
When I opened it the first two problems I saw were
1. protection diode (the really huge one)
2. The connector bars for the + Remote - were loose
I replaced the diode and soldered heavy gauge wires just for testing
so I connected the - and + wires to a 20 amp motorcycle battery and as i connect the remote wire I get a big spark at the + pole I touch the PWM IC and it was really warm I don't know if this is normal so I ordered one on Ebay but I'm waiting for it 🙂
There are two transistors (a1023) that drives the switch modes power MOSFETs I cant seem to freaking find them on ebay, I'm thinking of upgrading them but I have no idea what to replace them with..... help???
also Im not an expert at this, I would like for someone to tell me how the protection circuit works, I noticed the PCB trace coming from the protect LED going back to an OPAMP KIA 4558S I believe this controls it? its also someone how connected with the PWM IC
When I opened it the first two problems I saw were
1. protection diode (the really huge one)
2. The connector bars for the + Remote - were loose
I replaced the diode and soldered heavy gauge wires just for testing
so I connected the - and + wires to a 20 amp motorcycle battery and as i connect the remote wire I get a big spark at the + pole I touch the PWM IC and it was really warm I don't know if this is normal so I ordered one on Ebay but I'm waiting for it 🙂
There are two transistors (a1023) that drives the switch modes power MOSFETs I cant seem to freaking find them on ebay, I'm thinking of upgrading them but I have no idea what to replace them with..... help???
also Im not an expert at this, I would like for someone to tell me how the protection circuit works, I noticed the PCB trace coming from the protect LED going back to an OPAMP KIA 4558S I believe this controls it? its also someone how connected with the PWM IC
that diode has to be there. and u need a 10 amp fuse to power it for testing. have u checked the mosfets in the power supply and transistors output for shorts?
Hi,
Check this link It may help you to fix your amplifier.
Basic Switching Power Supply Design Tutorial
Check this link It may help you to fix your amplifier.
Basic Switching Power Supply Design Tutorial
Read the basic amp repair page (link in sig line below). It's all important but especially the part in the yellow box near the top of the page.
The BD 140 is generally a good replacement for the PNP power supply driver transistors. If the original transistors are not defective, there's no reason to replace them. You won't get any benefit from using a different transistor.
Don't buy semiconductors from ebay unless you know for a fact that the seller is reputable. There are too many counterfeit parts on ebay. Buy from Mouser or Digi-Key.
The 4558 is an op-amp that's part of the protection circuit. it takes input from various other components/circuits and uses the voltage from those circuits to drive the amp into protection if the input indicates that there's a problem.
The 4558 is likely connected to the power supply IC via diodes. When a fault is detected, it drives one of the inputs of the driver IC to shut down the drive pulses so that the power supply can't produce any output.
The BD 140 is generally a good replacement for the PNP power supply driver transistors. If the original transistors are not defective, there's no reason to replace them. You won't get any benefit from using a different transistor.
Don't buy semiconductors from ebay unless you know for a fact that the seller is reputable. There are too many counterfeit parts on ebay. Buy from Mouser or Digi-Key.
The 4558 is an op-amp that's part of the protection circuit. it takes input from various other components/circuits and uses the voltage from those circuits to drive the amp into protection if the input indicates that there's a problem.
The 4558 is likely connected to the power supply IC via diodes. When a fault is detected, it drives one of the inputs of the driver IC to shut down the drive pulses so that the power supply can't produce any output.
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