I just bought a brand new soldering iron
Hakko FC-888D
And I used solder paste and set iron to 650 degrees.
I soldered the fets originally with kester solder 60/40 rosin core
Hakko FC-888D
And I used solder paste and set iron to 650 degrees.
I soldered the fets originally with kester solder 60/40 rosin core
It doesn't look like the PNP drivers are working. Defective transistors, wrong transistors, bad connection to ground...
Are you sure that the FET gates aren't leaky to the other terminals (out of the circuit)?
It's hard to see how the power supply isn't drawing a huge amount of current with drive like that.
Are you sure that the FET gates aren't leaky to the other terminals (out of the circuit)?
It's hard to see how the power supply isn't drawing a huge amount of current with drive like that.
The original drivers were 3904/3906 I switched them out to a56/06 and I do not get good drive signal on any fet . The drive signal is even bad at the bases of the drivers .
Where should I go from here ?
I replaced the drivers again on the main board with brand new and still have the same problem .
From the collectors of the pnp drivers to amps ground terminal I get 0.03 ohms
I replaced the drivers again on the main board with brand new and still have the same problem .
From the collectors of the pnp drivers to amps ground terminal I get 0.03 ohms
Yeah I still have a problem with the power supply .
Does anyone have a picture of the driver area on the main board?
D107 is burnt and I can’t see the markings
Does anyone have a picture of the driver area on the main board?
D107 is burnt and I can’t see the markings
I tested the amp for 3 hours on the bench after repair again . It worked perfectly fine .
I give the amp back to the guy and he says the power supply blew again for the 3rd time .
Wondering if there could still be a problem but it worked fine for me or could it be an install issue since this will be the 3rd time it blew up on him .
First time it blew is when he bought it from someone else that said it was working perfect for them also but as soon as he Hooked it up supposedly it blew
I give the amp back to the guy and he says the power supply blew again for the 3rd time .
Wondering if there could still be a problem but it worked fine for me or could it be an install issue since this will be the 3rd time it blew up on him .
First time it blew is when he bought it from someone else that said it was working perfect for them also but as soon as he Hooked it up supposedly it blew
How hard did you run it when testing? This is a large amp and needs a lot of current to be tested properly.
Rockford doesn't have any strange problems that make it sensitive to installation problems. If he has a problem that's causing the amp to fail, it could be a fault with one of the protection circuits.
Have you checked the speakers and wiring for shorts with a multimeter?
This amp may be one that's simply too much trouble. Refund his money and let it be someone else's headache.
Rockford doesn't have any strange problems that make it sensitive to installation problems. If he has a problem that's causing the amp to fail, it could be a fault with one of the protection circuits.
Have you checked the speakers and wiring for shorts with a multimeter?
This amp may be one that's simply too much trouble. Refund his money and let it be someone else's headache.
I ran it hard on the bench for a hour with 0 issues .
Since he lives out of state I have no way of testing the wiring .
I’ve fixed 50 other amps for people with 0 issues .
I have video of the amp working correctly on the bench twice now .
Since he lives out of state I have no way of testing the wiring .
I’ve fixed 50 other amps for people with 0 issues .
I have video of the amp working correctly on the bench twice now .
Ok I just talked to him again about the amp the amp works .
The problem he said is the output side of the heatsink gets hot at idle after about 10 mins . Where the original problem was with that output getting hot .
He said you can still touch the heatsink but it gets hot after about 10 mins at idle .
Is this normal for these amps or does it still have an issue
The problem he said is the output side of the heatsink gets hot at idle after about 10 mins . Where the original problem was with that output getting hot .
He said you can still touch the heatsink but it gets hot after about 10 mins at idle .
Is this normal for these amps or does it still have an issue
Re-read what you wrote.
I wouldn't be concerned if it got slightly above ambient temperature but hot (what is hot, here) may be a concern.
Tell him to disconnect all speaker wires from the speaker terminals on the amp and see if it heats up as much.
I wouldn't be concerned if it got slightly above ambient temperature but hot (what is hot, here) may be a concern.
Tell him to disconnect all speaker wires from the speaker terminals on the amp and see if it heats up as much.