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"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
When I press the button for channel select, it doesn't change, so could be the issue
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
It died at and practice, could it be there was not enough power coming from wall socket or it was faulty? Just odd as the wall socket next to it was fine
If the lights on the amp were as bright as normal I suspect it's the amp though - the wall voltage would have to be really low before no sound came out of the amp, and I think you would notice the mains switch neon and channel LEDs being dim.
Fingers crossed that I'm wrong about that.
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
The amps been great for me, nearly 10 years with no problems
That's why you need a tech who offers a 'can't find fault, no fee' deal and free safety checks. Not everyone is out to fleece you.
Rift Amplification
Brackley, Northamptonshire
www.riftamps.co.uk
I’m so bored I might as well be listening to Pink Floyd
I fixed one by changing a couple of diodes in the channel switching circuit. Zenors I think but can't remember.
The other one had a bad Atmel chip. This chip is used for the channel changing and just changing it for a new one won't help as it it needs the code in it. I got the chip from someone on here, @RiftAmps I think ?
It's possible your IC has moved in it's holder ... this is under the DSP board for the reverb as far as I can remember. This often happens with vibration and chips in sockets.
I have a spare chip in stock already coded
But I learned a lot from that. I probably should have 'shotgunned' the whole switching circuit and resoldered every joint, even if it looked and metered OK, at a much earlier stage - but although with hindsight that would have fixed it, I didn't know that at the time and I was determined to find out *why* it was faulty... because without that, you can't be certain it won't do it again after it's gone back to the customer.
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
I charge to look at everything now but the max cost is capped. For a £30 diag charge I will spend an hour on a board, that's the minimum and the max cost fixed is around £180. Often I will fix something for £30 but still only charge the diag because I don't trust the rest of the circuit not to go wrong.
I don't fix guitar amps at all any more. They are too time consuming and take up too much room in relation to what the customer expects to pay. A Macbook motherboard customer however will happily pay £180 even if all I did was resolder a QFP chip.
Eventually tracked down the problem - the only bit of the system I couldn't automate was the addition of bank holidays. I wrote a bit of UI that enabled HR to enter them manually and someone had added easter Monday twice.
And yes, there should have been a check. I added one shortly afterwards.