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Comments
15A will probably cause a substantial amount of smoke to come out of the amp...
"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 read the ratings as
T6 3A L - 115v
T3 15A L - 230v
And not 6.3A & 3.15A, doh.
I did wonder what point a 15A fuse in the unit was when the most the plug could be was 13A lol.
"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
All I know is I was told it was plugged in, switched on & didn"t work.
I will have to see what happens when I replace the 2 blown fuses.
Are Laney RB9"s any good, would it be worth spending any money on fixing it (I can"t find them on the Laney site so it must be old & discontinued) ?
If it is worth fixing I have a DMM any suggestions of what to check & what sort of readings I should be looking for ?
Open it up and disconnect the power transformer completely from the main circuit board, making a note of where the wires go if they're individual connectors (I can't remember). Replace the fuse and power up again - if it now blows, the transformer is fried. A replacement will cost a fair bit, but is easy to fit so the labour charge should be low.
If it doesn't blow, it's very likely one or more power transistors have shorted. An outside possibility is a rectifier diode or two, but this is less common. If it's a power transistor it's also possible that it's done other damage to surrounding components, although often not. Finding which one(s) is fairly easy and still not a huge job for a tech familiar with these.
If it does prove to be the transformer, PM me - I have a couple of spares of about that size, although I can't remember if either of them are exactly that spec, I'll need to check.
"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 didn"t blow the fuses when I switched it on, just dead ?
There are some internal fuses on the main PCB I think, have a look at those. If they're blown then it's not the transformer since the fuses are downstream of it.
"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"ll open it up again tomorrow & see if I can locate any more fuses although I din"t notice any yesterday when I had it apart.
Also none of the transistors or diodes looked burned.
If it doesn't have fuses on the board there's a possibility that there's an internal thermal fuse in the transformer which has gone. To check that, meter from a ground point to the wires that go from the transformer to the PCB (AC voltage).
"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 shall check what I can tomorrow following your suggestions.