This amp is using 2SK1190 as the power supply fets .
Does anyone know of a good replacement for them ?
Does anyone know of a good replacement for them ?
The IRFIZ48 has been a good sub. There are a lot of other fully encapsulated FETs but these have been used a lot of times.
IRFIZ48NPBF Infineon datasheet and CAD model download | Octopart
IRFIZ48NPBF Infineon datasheet and CAD model download | Octopart
Thanks for the info .
Do you happen to have a schematic for this amp ?
Someone has been inside it before and not sure if some of the parts are original .
Resistors transistors diodes have been replaced
Do you happen to have a schematic for this amp ?
Someone has been inside it before and not sure if some of the parts are original .
Resistors transistors diodes have been replaced
According to pacparts and kenwoodparts, they're discontinued.
Will this fit?
MUR420RLG ON Semiconductor | Discrete Semiconductor Products | DigiKey
Will this fit?
MUR420RLG ON Semiconductor | Discrete Semiconductor Products | DigiKey
Will this one work UF1003-T Diodes Incorporated | Mouser
And wondering if all the diodes are the same according to the schematic .
Since there are multiple diodes with the same board locations
And the diodes I took out have all different part numbers and they are shorted
And wondering if all the diodes are the same according to the schematic .
Since there are multiple diodes with the same board locations
And the diodes I took out have all different part numbers and they are shorted
I think that will work. This is the rectifier for the driver voltage for the output transistor drivers. I don't know how much current they need to handle. I initially looked at 1 amp diodes but saw the 4 amp of the same size so I picked that one.
I also thought about the BYV-28-150s that were used in the old Rockford amps. The BYV-27 would also likely work. Many people who work on vintage Rockfords have those in stock.
I also thought about the BYV-28-150s that were used in the old Rockford amps. The BYV-27 would also likely work. Many people who work on vintage Rockfords have those in stock.
I found some 2 watt resistors on the board near the rectifiers .
2 of them are 100 ohm and measure 109 ohm
The other 2 are 270 ohm and measure 277 ohm
Are these ok to run or should they also be replaced ?
2 of them are 100 ohm and measure 109 ohm
The other 2 are 270 ohm and measure 277 ohm
Are these ok to run or should they also be replaced ?
I don't see them on the diagram. If they're 10% tolerance, they're OK. If they're 5% tolerance, they are very slightly out of tolerance but likely OK.
The amp powers up and plays clean audio .
The problem I’m having is there is low output out of both channels and if I bridge the amp it will draw current and shut the amp off .
The problem I’m having is there is low output out of both channels and if I bridge the amp it will draw current and shut the amp off .
It's going to draw much more current bridged.
Find the resistors on the diagram and send me a page number and map reference from the page.
Find the resistors on the diagram and send me a page number and map reference from the page.
It’s on page 12
Also the values are listed on page 19
Also the values are listed on page 19
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Those aren't near the rectifiers or on the RCA board as far as I can see.
I think they're OK. If you have them, replace them. If you have to place an order just for these parts, I don't think it's worth ordering them.
I think they're OK. If you have them, replace them. If you have to place an order just for these parts, I don't think it's worth ordering them.
I just double checked and your right my mistake .
They are on a smaller board .
I found the the traces to the rca shield grounds broken .
Would that cause the amp to have low output ?
They are on a smaller board .
I found the the traces to the rca shield grounds broken .
Would that cause the amp to have low output ?