rockford 1000a2 noise in left channel - diyAudio
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Old 11th June 2011, 03:05 PM   #1
stoke is offline stoke  ominican Republic
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Default rockford 1000a2 noise in left channel

when i play music on the right channel theres a noise present and the irf9640 gets warm quickly
Click the image to open in full size.

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 03:12 PM.
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Old 11th June 2011, 03:51 PM   #2
stoke is offline stoke  ominican Republic
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gate signal q316 without speak
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gate signal q316 with speak
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gate signal q216 without speak
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gate signal q216 with speak
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gate signal q311 without speak
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gate signal q211 without speak
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Last edited by stoke; 11th June 2011 at 03:56 PM.
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Old 11th June 2011, 04:02 PM   #3
stoke is offline stoke  ominican Republic
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i replaced Q321, Q322, Q324 ,Q325....... AND STILL GETTING THE SAME GATE SIGNALS OF THIS CHANNEL
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Old 11th June 2011, 05:47 PM   #4
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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.
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Old 11th June 2011, 06:02 PM   #5
stoke is offline stoke  ominican Republic
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Quote:
Originally Posted by Perry Babin View Post
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
Click the image to open in full size.

Last edited by stoke; 11th June 2011 at 06:32 PM.
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Old 11th June 2011, 06:11 PM   #6
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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.
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Old 11th June 2011, 07:15 PM   #7
stoke is offline stoke  ominican Republic
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Quote:
Originally Posted by stoke View Post
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
Click the image to open in full size.
why im having different voltage is supposed to be the same..
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Old 11th June 2011, 07:26 PM   #8
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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.
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Old 11th June 2011, 08:29 PM   #9
stoke is offline stoke  ominican Republic
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ok, i have the transistor clamped to the heatsink, now how i know that bais control is working properly when im adjunsting it
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Old 11th June 2011, 08:35 PM   #10
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The idle current will increase as the transistors become bised on.

Is the output clean or distorted from this channel?
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