Rockford Fosgate Power 360a2

seankane · 2011-04-19 1:36 am

R215 has 16 vdc on one end -1.628 vdc on the other side.I checked it for ohms and it had a really wierd reading like 1.567 ohms in circuit so I removed it from circuit and it tested at 55 ohms which is way out of tolerance. I will change it and post my result.

seankane · 2011-04-19 1:43 am

Should I reinstall D202 before powering amp?

Perry Babin · 2011-04-19 1:53 am

No, but be careful. The amp could draw excessive current.

seankane · 2011-04-19 1:53 am

Replaced R215Replaced D202Powered up amp, and no dc on terminal, going to check for audio but have to install it in the sink first just to be safe. Post my audio result shortly.........

seankane · 2011-04-19 2:00 am

The DC is gone from the terminal, but the channel will not produce audio. If you turn the volume up loud you can hear music playing inside the amp.

seankane · 2011-04-19 2:03 am

The faulty channel does bias fine though.

Perry Babin · 2011-04-19 2:12 am

Compare the level of the signal on C223 and C111. Are they essentially the same?

seankane · 2011-04-19 2:31 am

C111 has a good signal looks just like the output of the good channel, but C223 has no signal just like the output of that channel.

Perry Babin · 2011-04-19 2:41 am

Do you have a good signal on pin 7 of U201, U202 and U203?

seankane · 2011-04-19 2:55 am

They all seem to look the same, but U201 does not have the amplitude U202 and U203 do. They all look like a heart beat on an EKG if you will. I can post a pic if you need me to.

seankane · 2011-04-19 2:56 am

20 m vol/div and 5 us were the best setting for the scope to trigger nicely and lock a waveform.

Perry Babin · 2011-04-19 3:01 am

Doesn't the signal look like the input signal?

These signals pass through the crossover selector switch then to C223. If you have a good signal on these but not on both terminals of C223, the switch is likely defective.

seankane · 2011-04-19 3:10 am

Yes they look the same as the input signal just U201 does not have the amplitude in signal that U202 and U203 do. Shall I check to see if the signal is going to the cross over selector and not back out. Switching the switch to all positions makes no difference.

seankane · 2011-04-19 3:17 am

I installed a bananna clip onto my ground (like you told me to do along time ago) and got a different result. The signal looks the same on both sides of C223 and C111 just like the input. The pin 7 on U201 U202 U203 are the same as the input signal, just a little less on the amplitude of U201. I checked the cross over selector switch and have the same signal as the input on all pins.

Perry Babin · 2011-04-19 10:40 am

If you have the same signal on both sides of C111 and C223, the problem must be in the amplifier section.

Do you read the same DC voltage across R222 and R122?

seankane · 2011-04-19 2:03 pm

Yes they both read -06.05 vdc

Perry Babin · 2011-04-19 3:53 pm

Is R251 within tolerance?

seankane · 2011-04-20 7:31 am

R251 reads 10.1 which is fine, but I changed it with a new one and same result no audio.

seankane · 2011-04-20 8:17 am

I am going to replace the cross over selector switch just for the heck of it.

Perry Babin · 2011-04-20 8:27 am

There's no point if you have audio at C223.

Do you have audio on the base of Q202 and/or Q203?

Rockford Fosgate Power 360a2

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