rockford 1000a2 noise in left channel

stoke · 02:12 PM

when i play music on the right channel theres a noise present and the irf9640 gets warm quickly

the website for old rockford schematics is down right now can some one send me the schematic of this amp.

sorry it's the right channel with the problem not the left as i mentioned before

stoke · 02:56 PM

gate signal q316 without speak

gate signal q316 with speak

gate signal q216 without speak

gate signal q216 with speak

gate signal q311 without speak

gate signal q211 without speak

stoke · 11th June 2011, 03:02 PM

i replaced Q321, Q322, Q324 ,Q325....... AND STILL GETTING THE SAME GATE SIGNALS OF THIS CHANNEL

Perry Babin · 11th June 2011, 04:47 PM

What's the PC# on the board?

This generally happens when either the bias isn't set high enough or when there is a defective output or 0.1 ohm source resistor.

stoke · 05:32 PM

Quote:

Originally Posted by Perry Babin

What's the PC# on the board?

This generally happens when either the bias isn't set high enough or when there is a defective output or 0.1 ohm source resistor.

hi perry the pc is 2392C

BOTH bias are set equal and there aren't defective output or source resistor.

the only thing i found is this check the pic

Perry Babin · 11th June 2011, 05:11 PM

I have it. Email me if you want the schematic diagram.

babin_perry@yahoo.com

I don't know if you realized it but this is not a conventional amplifier. You won't see the output signal on the output transistors. The output is taken from one of the secondaries on the power supply transformer.

stoke · 11th June 2011, 06:15 PM

Quote:

Originally Posted by stoke

hi perry the pc is 2392C

BOTH bias are set equal and there aren't defective output or source resistor.

the only thing i found is this check the pic

why im having different voltage is supposed to be the same..

Perry Babin · 11th June 2011, 06:26 PM

I don't know exactly why you have higher voltage but the voltage at the various points inside the feedback loop will vary to whatever they need to be to produce a clean output signal.

Is the output clean or distorted from this channel?

Is the bias control on this channel working properly? Don't try adjusting it without having the transistors clamped to the heatsink.

stoke · 11th June 2011, 07:29 PM

ok, i have the transistor clamped to the heatsink, now how i know that bais control is working properly when im adjunsting it

Perry Babin · 11th June 2011, 07:35 PM

The idle current will increase as the transistors become bised on.

Is the output clean or distorted from this channel?

11th June 2011, 02:05 PM	#1
stoke diyAudio Member Join Date: Mar 2010	rockford 1000a2 noise in left channel when i play music on the right channel theres a noise present and the irf9640 gets warm quickly the website for old rockford schematics is down right now can some one send me the schematic of this amp. sorry it's the right channel with the problem not the left as i mentioned before Last edited by stoke; 11th June 2011 at 02:12 PM.

11th June 2011, 02:51 PM	#2
stoke diyAudio Member Join Date: Mar 2010	gate signal q316 without speak gate signal q316 with speak gate signal q216 without speak gate signal q216 with speak gate signal q311 without speak gate signal q211 without speak Last edited by stoke; 11th June 2011 at 02:56 PM.

11th June 2011, 04:47 PM	#4
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	What's the PC# on the board? This generally happens when either the bias isn't set high enough or when there is a defective output or 0.1 ohm source resistor. __________________ Links >> Basic Car Audio Amp Repair * Basic Car Audio Electronics * New Site * Basic Switching Power Supply Design * Basic Computer Skills << Links

11th June 2011, 05:11 PM	#6
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	I have it. Email me if you want the schematic diagram. babin_perry@yahoo.com I don't know if you realized it but this is not a conventional amplifier. You won't see the output signal on the output transistors. The output is taken from one of the secondaries on the power supply transformer. __________________ Links >> Basic Car Audio Amp Repair * Basic Car Audio Electronics * New Site * Basic Switching Power Supply Design * Basic Computer Skills << Links

11th June 2011, 06:26 PM	#8
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	I don't know exactly why you have higher voltage but the voltage at the various points inside the feedback loop will vary to whatever they need to be to produce a clean output signal. Is the output clean or distorted from this channel? Is the bias control on this channel working properly? Don't try adjusting it without having the transistors clamped to the heatsink. __________________ Links >> Basic Car Audio Amp Repair * Basic Car Audio Electronics * New Site * Basic Switching Power Supply Design * Basic Computer Skills << Links


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11th June 2011, 03:02 PM	#3
stoke diyAudio Member Join Date: Mar 2010	i replaced Q321, Q322, Q324 ,Q325....... AND STILL GETTING THE SAME GATE SIGNALS OF THIS CHANNEL

11th June 2011, 07:29 PM	#9
stoke diyAudio Member Join Date: Mar 2010	ok, i have the transistor clamped to the heatsink, now how i know that bais control is working properly when im adjunsting it

11th June 2011, 07:35 PM	#10
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	The idle current will increase as the transistors become bised on. Is the output clean or distorted from this channel? __________________ Links >> Basic Car Audio Amp Repair * Basic Car Audio Electronics * New Site * Basic Switching Power Supply Design * Basic Computer Skills << Links

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