Greetings!
I got a good amplifier from a friend, the Carlsbro Powerline pro 2000. the main issue is, that the driver boards are missin.
I only have the transformer, power supply, input and output boards and potentiometer boards. I powered everything up, and the outputs work fine.
I dont know where the VAS and the IPS are located, i dont know if they are missing. I would like to kindly ask everybody for a schematic.
Without it i am in complete darkness. I would like to design around these boards, as i could get a really powerful PA amp out of them.
I got a good amplifier from a friend, the Carlsbro Powerline pro 2000. the main issue is, that the driver boards are missin.
I only have the transformer, power supply, input and output boards and potentiometer boards. I powered everything up, and the outputs work fine.
I dont know where the VAS and the IPS are located, i dont know if they are missing. I would like to kindly ask everybody for a schematic.
Without it i am in complete darkness. I would like to design around these boards, as i could get a really powerful PA amp out of them.
Many thanks for the upper schematic.
I do not know, but is this schematic the right one?
My friend found the small boards which go on top, where the VAS and IPS are located.
One channel works fine now, but the other does not.
There are two leds, which i suppose are a part of two current sources for some stage.
The marked one does not light up.
This led is connected from the base of the transistor above it to the - Ucc.
I measured and compared the voltages of both channels and there is a huge difference on the marked resistor.
On the healthy board, the drop is about 18 V, on the not working one its close to 40 V.
I checked all the resistors and transistors in this part and everything seems to be ok, i checked them desoldered.
I have no clue what does that trimmer above the marked resistor do. The one on the right side is part of the VBE multiplier i suppose, because adjusting it, the bias current changes. Is this stage with LED current sources and stuff some kind of current limiting?
Output wise there is a slight offset of 300 mV DC, and heavy distortion.
And before you say its the output boards, I swapped the output boards and the both work ok on a healthy input board. So the issue presists where i marked.
These LED current sourced stage is not present in the schematic, I do not have a clue what it does.
Any suggestions how to proceed?
And a picture od the whole "input" board.
I do not know, but is this schematic the right one?
My friend found the small boards which go on top, where the VAS and IPS are located.
One channel works fine now, but the other does not.
There are two leds, which i suppose are a part of two current sources for some stage.
The marked one does not light up.
This led is connected from the base of the transistor above it to the - Ucc.
I measured and compared the voltages of both channels and there is a huge difference on the marked resistor.
On the healthy board, the drop is about 18 V, on the not working one its close to 40 V.
I checked all the resistors and transistors in this part and everything seems to be ok, i checked them desoldered.
I have no clue what does that trimmer above the marked resistor do. The one on the right side is part of the VBE multiplier i suppose, because adjusting it, the bias current changes. Is this stage with LED current sources and stuff some kind of current limiting?
Output wise there is a slight offset of 300 mV DC, and heavy distortion.
And before you say its the output boards, I swapped the output boards and the both work ok on a healthy input board. So the issue presists where i marked.
These LED current sourced stage is not present in the schematic, I do not have a clue what it does.
Any suggestions how to proceed?
And a picture od the whole "input" board.
Oh, and before you say anything, i ALSO checked the LED and its fine🙂
And also the missing zobel network, somebody stole the coil and the resistor, so i bridged the coil for the time during repair.
And also the missing zobel network, somebody stole the coil and the resistor, so i bridged the coil for the time during repair.
Soundking used to change their layouts and builds so often, we rarely found the schematic matched the model in front of us. Sorry, that is the only one I have.