Rockford Fosgate Punch 800.2

[seankane]

pics

 

[seankane]

Pleasde read post #80 and view #81 I forgot to post the pics with post #80.

Sorry for the confusion.

 

[Perry Babin]

Check R238.

 

[seankane]

R238 in the 2 series channel is good 47 ohms.

 

[Perry Babin]

Lift D202 to see if that allows the channel to produce clean audio.

 

[seankane]

Lifted D202 and output still looks the same.

 

[Perry Babin]

It appears that the drivers aren't driving hard enough. Double-check Q224 and R234.

 

[seankane]

Q224 and R234 are OK

 

[Perry Babin]

Was the photo taken with a load?

 

[seankane]

Just a 100Hz signal no load.

Do you want me to hook the 80 watt 2 ohm resistor the output terminals and post a new photo?

 

[Perry Babin]

Leave it directly connected to the supply but connect it to a speaker or dummy load and post a photo of the defective channel driven to clipping.

 

[seankane]

I cant it maxes out my power supply before the signal clips.

When I get to about 1/4 volume I am drawing 60 amps thats all my supply has, it kicks my supply into protect.

 

[seankane]

Did you get a chance to read post #92?

Maybe I am connecting the load to the amp improperly?

 

[Perry Babin]

You connect it to the speaker terminals like you would a speaker. You only need to load the distorted channel. It doesn't need to be a 2 ohm load. It can be a 4 or even an 8 ohm load.

 

[seankane]

You connect it to the speaker terminals like you would a speaker. You only need to load the distorted channel. It doesn't need to be a 2 ohm load. It can be a 4 or even an 8 ohm load.

Thats how I had it hooked up.

I have 4..... 8 ohm resistors wired in parallel, 4 leads to one end and 4 leads to the other end. I hooked a terminal of the amp to each end.

I only had it hooked to the bad channel. Maybe a 2 ohm load makes the amp draw to much current?

I guess I could just use 1 and do an 8 ohm load that probably wouldnt draw much current?

 

[seankane]

Amp connected straight to supply, all parts in circuit, all 3 jumpers installed, defective channel, 8 ohm load, scope set at 2ms/20vd.

 

[Perry Babin]

Lift D202 again to see if there is any change with the load.

 

[seankane]

Im sorry Perry I should have been more specific, all parts are in the circuit except D202.

The load signal you are seeing is with D202 removed.

 

[Perry Babin]

Try this with both a higher and lower frequency signal. Does the distortion always happen precisely the the bottom of the waveform?

Is there possibly a small ceramic capacitor near the components that were replaced that was damaged?

 

[seankane]

Amp connected directly to supply, all parts except D202 in circuit, all 3 jumpers installed, 8 ohm load, scope setting 2ms/20vd.

1st pic: high frequency
2nd pic: low frequency

It seems to be more sensitive to the higher frequency.
The lower frequency still kinda looks funny at full volume.