When I got this amp in to repair the guy stated it blows the fuses .
I replaced the fuses and powered the amp up and it idled perfectly and had clean audio .
I removed the clamps and noticed someone tried repairing this at some point and it has mismatched power supply fets and outputs .
All power supply fets and outputs test fine .
Im going to replace all power supply fets and outputs due to them being mismatched .
Wondering if this could cause the fuses to blow in the vehicle or anything I should check ?
I replaced the fuses and powered the amp up and it idled perfectly and had clean audio .
I removed the clamps and noticed someone tried repairing this at some point and it has mismatched power supply fets and outputs .
All power supply fets and outputs test fine .
Im going to replace all power supply fets and outputs due to them being mismatched .
Wondering if this could cause the fuses to blow in the vehicle or anything I should check ?
Back to this amp . I received the parts and was checking the drive before installing new fets .
Pic 1 is what I get on some of the gate pads for the fets Pic 2 is what I get on the other half is this normal ?
Scope set to 5us .5 volts Div
Pic 1 is what I get on some of the gate pads for the fets Pic 2 is what I get on the other half is this normal ?
Scope set to 5us .5 volts Div
Attachments
With a 0.1 cap soldered in between gate and source here is what I get on the banks for the fets .
In the 2nd pic doesn’t look like the drive is going back fully to ground .
Are these drive signals ok or do I have a problem ?
scope set to 5 us 2 volts Div
In the 2nd pic doesn’t look like the drive is going back fully to ground .
Are these drive signals ok or do I have a problem ?
scope set to 5 us 2 volts Div
Attachments
What's the measured frequency of the drive signal?
The PNP driver looks like it's defective on the image on the right.
The PNP driver looks like it's defective on the image on the right.
I replaced the drivers and the drive is perfect now .The frequency of the drive is 60hz
Do you happen to know the value of the fuses ?
Do you happen to know the value of the fuses ?
The drive is going to be approximately 20kHz. Re-check.
Two 30 amp fuses according to the manual (attached).
Two 30 amp fuses according to the manual (attached).
I will recheck the frequency.
I replaced the outputs in 1 channel since they were mismatched different date codes from a previous repair done by someone else .
Wondering since I replaced the outputs in 1 channel should I just go ahead and replace them in the other channel as well even tho they all have matching date codes in the other channel ?
Just wondering since it’s in for repair if some people usually just replace both channels outputs instead of just 1
I replaced the outputs in 1 channel since they were mismatched different date codes from a previous repair done by someone else .
Wondering since I replaced the outputs in 1 channel should I just go ahead and replace them in the other channel as well even tho they all have matching date codes in the other channel ?
Just wondering since it’s in for repair if some people usually just replace both channels outputs instead of just 1
For what the repair was going to cost (the owner) anyway, replace them. Whether he'll pay the $15 extra for the parts, or not, it's probably worth doing it.
The corrosion isn't significant. I probably wouldn't do anything unless the amp was something special and very valuable. Corrosion is typically a non-conductive oxide. If you think it's a problem, use a relatively dull pick (not to scratch the board) and run it between any corrosion-bridged pads.
I’m putting the board back in the heatsink and have new Sil pad .
With the new sil pad should I still I use thermal compound a lil under the mating surface and some behind each heatsink mounted transistor ?
With the new sil pad should I still I use thermal compound a lil under the mating surface and some behind each heatsink mounted transistor ?