Rockford Fosgate BD1000

[seankane]

Just an update for some reason the amp now has output but sounds staticy and the woofer kinda pulses in and out a little and the sound crackles in and out as you increase the volume but no excess current draw or anything. Maybe I should try replacing the mps a56's ???? Just a guess???

 

[seankane]

Anybody?????

 

[seankane]

Have you given up on me Perry???

 

[Perry Babin]

No, but I can't go indefinitely without sleep.

You need to confirm that you have a clean signal reaching the input to the class D amp. You'll need your scope for that.

Have you confirmed that you have a good shield ground connection on the RCA jacks?

 

[seankane]

I installed brand new RCA plugs on the board, but i guess that does not mean anything if I am not sure how to confirm this. I will mess with the scope more and see if I can lock it on to a wave form, but if I unhook the ground i get a wave form but with the ground hooked up to the power supply ground I still get the double lines. Did you get a chance to look at the pics i posted that you requested? I hear you on the sleep I have been running on fumes myself !!

 

[Perry Babin]

If you installed new RCA jacks and the ground connection between the board and the RCA shield is intact, there's no need to be concerned about it.

The scope ground and the power supply ground must be connected.

The double-lines are the untriggered signal. When you get the timebase right and the scope is triggered (the trigger lamp should light up), you will see a square wave.

 

[seankane]

Ok thank-you Perry I will mess with it a bit and get back to you, I know its kinda hard for you to help me considering my knowledge of the scope and not having it dialed in. Thanks again for all your help....

 

[Perry Babin]

Take however much time it requires to learn to use it. If it takes weeks, that's fine. You need to learn to use it.

 

[seankane]

Hey Perry thanks to your posting of the pic maybe I can shed some light on why I cant get a lock. The writing is wore off my knobs and I had no idea that you had to pull and turn the time div knob. So thats like 2 adjustments in and out. Is this why ??

 

[Perry Babin]

For the timebase, the two knobs that rotate together should be locked to the same time.

 

[seankane]

Ok well they were not because with the writing wore off I had no idea that the knob would pull out for adjustment. Is this possibly a reason I cant get a lock on a waveform??

 

[Perry Babin]

Probably not.

Pull the knob out and rotate it fully counterclockwise (until it stops) and leave it there. If it's in the correct location, the timebase will be able to rotate through the entire range.

Set it to 5uS.

 

[seankane]

Will do thank-you Perry get back to you later.

 

[seankane]

Hey Perry still nothing, get a good wave form without the ground hooked up but soon as the ground is hooked up it does nothing no matter what is adjusted. Absolutely nothing !!!! I posted a pic of the wave form with no ground hooked up so you could see pins 1 and 7 and you already saw what the wave form looked like with the ground, the double line and the solid line. I am beginning top think either this thing was not calibrated like the guy said or there is something wrong with it. What do you think???

 

[Perry Babin]

I can't see the timebase setting but that appears to be 60Hz mains.

Did you get it to lock on the calibrator loop on the front of the scope?

 

[seankane]

I can't see the timebase setting but that appears to be 60Hz mains.

Did you get it to lock on the calibrator loop on the front of the scope?

Yes it is a square wave form but really small squares and the trigger adjustment does nothing to change this. The scope was set to 5vol/div and 5ms should I have it on 5us ?? Will that make any difference in my trigger adjustment and my wave form ??

 

[Perry Babin]

When you say 'small' do you mean short or narrow?

 

[seankane]

When you say 'small' do you mean short or narrow?

Well I gues I would mean narrow like the square wave form barely leaves the baseline but just enough you can tell the are a sqaure form.

 

[Perry Babin]

Turn the timebase until it deflects ±3 divisions. Turn the timebase so that 3 full cycles are displayed. Does it display a clean, locked waveform?

 

[seankane]

I think I may have something now. I posted 2 pics for you. The wavey line is of pin 7 on U11. The square wave form is on pin 1 of u11. The scope is set at 5vol/div and 5us. Does any of this look right??