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Old 7th June 2011, 07:29 PM   #11
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Location: Louisiana
You measure voltages with power applied to the amp (amp on unless otherwise specified).

You measure resistances with no power applied.

Spell out, very specifically, what you don't understand and I'll try to help. Don't short-hand anything. Be very clear about what you don't understand. Separate each question from the one before with a blank line.

If you haven't done so already, read the basic amp repair page (link in sig file below).
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Old 7th June 2011, 11:29 PM   #12
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Perry,

Thanks for the response and advice. I will measure voltages and resistances per your request and advise on results.

I will also be very specific on the things i don't understand and separate questions individually.

With your help, I'm sure i'll be able to figure this one out. Thanks again.
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Old 8th June 2011, 02:51 AM   #13
kds9591 is offline kds9591  United States
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If you can read a schematic Perry or someone else may have it for this amp and can e-mail it to you or you can get it e-mailed to you from Rockford. It would help you a lot, most brands of car amps you can't get a schematic for, Rockford is one of the few brands you can.

Also read Basic Car Audio Repair using the link in Perry's signature line. He also has a Basic Car Amp Repair course as well. Very good information and excellent real world examples & solutions.
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Old 11th June 2011, 07:00 PM   #14
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Perry,

Sorry, work got the best of me this week.

See below this is where i'm at for now:

Rail voltage on the output transistors (third leg of IRF540's)? With red lead of MM to B+ on amp and black lead to third leg of Mosfet chip
Q103 =12.18V
Q104 =12.18V
Q107 =44.9V
Q106 =44.9V

Q206 =44.9V
Q207 =44.9V
Q204 =12.16V
Q203 =12.16V

Regulated voltage on the power supply pins of the audio op-amps? Not sure how to measure or what pin orientation is.
Left Channel (LM833)
Right Channel (LM833)

Does operating any of the switches or potentiometers through their entire range make a difference?
Right Channel potentiometers work only. you can hear the low to high range but still need to hold speaker to your to hear.
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Old 11th June 2011, 07:10 PM   #15
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Location: Louisiana
Never use the B+ terminal as the reference. In general, you use the amplifier's ground terminal as the reference. That means that you place the black meter probe on the amp's ground terminal.

If you're not sure of the pin configuration for any op-amp, search for 'datasheet' and the number on the IC.
datasheet lm833 - Google Search
http://www.national.com/ds/LM/LM833.pdf

For the LM833, the power supply pins are 4 and 8.

What are you using for a signal source?
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Old 11th June 2011, 07:32 PM   #16
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Thanks for the correction and redirect.

I'll re-measure and provide new measurements momentarily.

I'm using an Itouch for Audio source.

thanks
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Old 11th June 2011, 07:49 PM   #17
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Do you have a sine wave test tone track?

If not, use this one:
http://www.bcae1.com/temp/100hz300seconds.zip

Drive a signal into the amp and measure the AC voltage on the terminals on the back of the RCA jacks. What's the highest voltage the itouch can produce without clipping/distorting? You may have to listen to it via headphones to see where it clips if you don't have a scope.
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Old 11th June 2011, 08:06 PM   #18
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drove the signal with full volume on the itouch and full gain. still needed to put speaker to my ear to hear but could hear the tone without any clipping.

AC voltage at the rear RCA terminals = 1.02 volts (AC)
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Old 11th June 2011, 08:13 PM   #19
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On terminals 8 and 12 of the preamp module, do you see the same voltage?
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Old 11th June 2011, 08:15 PM   #20
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New output transistors rail values:

Q103 = -.008V
Q104 = -.008V
Q107 = -32.65V
Q106 = -32.65V

Q206 = -32.65V
Q207 = -32.65V
Q204 = -0.008V
Q203 = -0.008V
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