Hello all forum users.
After repairing a couple of my colleges tv's by simply replacing bulging caps on their power supplies, I got thrown this massive amplifier at me to try and fix. The message was "either you fix it, or I'll throw it", and I like a challenge. I'm mostly fond of digital electronics, but I do know some basic analog and thought this might give me some valuable experience, if I got it to work.
The amplifier is made in Norway and weighs at least 20 kg, no information to be found online.
One of my main concerns is that it is normally driven by a preamplifier, which I don't have. The input signals connects by a XLR connector. To test the amplifier (of course not final test) to trace and detact signals on the PCB, is it okay to use my signal generator positive on the positive polarity terminal of the XLR, and the signal generator ground on the returning terminal?
I guess you need to know what the problem here is, and it's really just one dead channel. Completely dead. The owner said it started failing slowly (channel alive/channel dead, repeat) but completely died after a while.
I have read through this page
http://www.bcae1.com/repairbasicsforbcae1/repairbasics.htm
and from what I can see it's very informative as a guide to start of identifying modules and components. So far I've identified the power supply, and each channels amplifier PCBs with the driver transistors and output transistors.
http://sandakerpalm.no/andftp/IMAG0110.jpeg
Click the link for an image.
Any hints or tips before I go further on this! Thanks in advance!
Henrik
After repairing a couple of my colleges tv's by simply replacing bulging caps on their power supplies, I got thrown this massive amplifier at me to try and fix. The message was "either you fix it, or I'll throw it", and I like a challenge. I'm mostly fond of digital electronics, but I do know some basic analog and thought this might give me some valuable experience, if I got it to work.
The amplifier is made in Norway and weighs at least 20 kg, no information to be found online.
One of my main concerns is that it is normally driven by a preamplifier, which I don't have. The input signals connects by a XLR connector. To test the amplifier (of course not final test) to trace and detact signals on the PCB, is it okay to use my signal generator positive on the positive polarity terminal of the XLR, and the signal generator ground on the returning terminal?
I guess you need to know what the problem here is, and it's really just one dead channel. Completely dead. The owner said it started failing slowly (channel alive/channel dead, repeat) but completely died after a while.
I have read through this page
http://www.bcae1.com/repairbasicsforbcae1/repairbasics.htm
and from what I can see it's very informative as a guide to start of identifying modules and components. So far I've identified the power supply, and each channels amplifier PCBs with the driver transistors and output transistors.
http://sandakerpalm.no/andftp/IMAG0110.jpeg
Click the link for an image.
Any hints or tips before I go further on this! Thanks in advance!
Henrik