Rockford Fosgate 600.5 - Page 7

Perry Babin · 20th March 2010, 02:43 PM

20v/div and 2mS/div.

I don't think the 540Ns are causing the problems you're having at this point.

mike49504 · 20th March 2010, 03:22 PM

No voltage on the second set and no square wave on the sec set of rectifiers

Perry Babin · 20th March 2010, 03:23 PM

Can you post a photo of the windings on the transformer (where they go into the board)?

mike49504 · 20th March 2010, 04:02 PM

Heres the pics of the windings

mike49504 · 20th March 2010, 04:03 PM

heres another one also

Perry Babin · 20th March 2010, 04:36 PM

Did you see the square wave and DC with the scope on the first set of rectifiers?

mike49504 · 20th March 2010, 05:15 PM

No gate wave on the first set either. Only place i have a gate wave is on the power supply fets

Perry Babin · 20th March 2010, 05:23 PM

With your multimeter, confirm that you have ~2.3v DC on pins 1 and 2 of the 494. Also confirm that you have rail voltage on the first set of rectifiers.

If you have those, the peak to peak voltage on the rectifiers may be too much for the settings you used on the scope. Set it to the highest v/div and make sure that you have the probe set to 10x (if it has a switch). If you see horizontal lines above and below the reference line, turn the vertical amplifier to whatever it takes to get those vertical lines to ~±3 vertical divisions. Then turn the timebase until you have ~3-4 cycles on the display. This basic procedure is something you'll have to do on may repairs so try to remember it.

mike49504 · 20th March 2010, 05:32 PM

I think i have bad rectifiers in this amp i started testing like u said and now i only have voltage on 1 rectifier from the first set and voltage on 1 of the other set im gonna change them out and retest

20th March 2010, 02:43 PM	#61
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	20v/div and 2mS/div. I don't think the 540Ns are causing the problems you're having at this point. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

20th March 2010, 03:23 PM	#63
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Can you post a photo of the windings on the transformer (where they go into the board)? __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

20th March 2010, 04:36 PM	#66
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Did you see the square wave and DC with the scope on the first set of rectifiers? __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

20th March 2010, 05:23 PM	#68
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	With your multimeter, confirm that you have ~2.3v DC on pins 1 and 2 of the 494. Also confirm that you have rail voltage on the first set of rectifiers. If you have those, the peak to peak voltage on the rectifiers may be too much for the settings you used on the scope. Set it to the highest v/div and make sure that you have the probe set to 10x (if it has a switch). If you see horizontal lines above and below the reference line, turn the vertical amplifier to whatever it takes to get those vertical lines to ~±3 vertical divisions. Then turn the timebase until you have ~3-4 cycles on the display. This basic procedure is something you'll have to do on may repairs so try to remember it. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

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20th March 2010, 03:22 PM	#62
mike49504 diyAudio Member Join Date: Sep 2006	No voltage on the second set and no square wave on the sec set of rectifiers

20th March 2010, 05:15 PM	#67
mike49504 diyAudio Member Join Date: Sep 2006	No gate wave on the first set either. Only place i have a gate wave is on the power supply fets

20th March 2010, 05:32 PM	#69
mike49504 diyAudio Member Join Date: Sep 2006	I think i have bad rectifiers in this amp i started testing like u said and now i only have voltage on 1 rectifier from the first set and voltage on 1 of the other set im gonna change them out and retest

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