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Old 15th March 2012, 08:18 PM   #1
shawnk is offline shawnk  United States
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Default Rockford T30001bd

Hey guys!

I have this T30001bd amp here that I have recently repaired the output stage.

The amp is working fine thus far (low level testing) save for one problem. I'm getting a pretty nasty turn on spike which is quite audible through the speaker. When the amp first powers up, the "protect" l.e.d. is engaged for aproximately two seconds as the rail caps are charging, then the amp comes out of protect and the "power/blue" l.e.d. engages and this is when I'm getting the audible spike (over 1vdc).

I've checked the other threads pertaining to the T30001 but didn't find anyone having the same problem.

Any insight would be appreciated!!!
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Old 15th March 2012, 11:52 PM   #2
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Is the spike less if you set the subsonic filter on?
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Old 15th March 2012, 11:57 PM   #3
shawnk is offline shawnk  United States
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It's the same in either position.

Thanks for the reply Perry!
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Old 16th March 2012, 12:45 AM   #4
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Do you read more than about 0.05v DC on the output terminals of any of the audio op-amps in the amp?
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Old 16th March 2012, 02:55 AM   #5
shawnk is offline shawnk  United States
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Yes actually. I'm getting between .5v-.6v on all of them. That's also for both output 1 & 2 These figures don't change even when adjusting any of the pots/switches/etc.. if that helps in advance?

Thanks!
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Old 16th March 2012, 03:13 AM   #6
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If you're getting 0.5-0.6v on pins 1 and 7 of all of the 8-pin audio op-amps, you may have a ground problem. Where was the black probe when you measured the voltage on the op-amps?
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Old 16th March 2012, 04:11 AM   #7
shawnk is offline shawnk  United States
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Just went back and I'm getting the same results. I did however, notice that U105 U106 & U107 are in fact effected by the gain pot. However, only pin 7 of U105 is effected by the gain and pin 1 rests @ 0.58v like the rest.

I'm using the B- terminal on the amp for the meter's neg. probe

Thanks
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Old 16th March 2012, 04:38 AM   #8
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Try using the negative speaker terminal.
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Old 16th March 2012, 02:01 PM   #9
shawnk is offline shawnk  United States
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Same results bro

Thanks
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Old 16th March 2012, 02:06 PM   #10
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Connect the input RCA shield to the main ground terminal and re-check them.
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