Rockford Fosgate T30001 - Page 4 - diyAudio
Go Back   Home > Forums > General Interest > Car Audio

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 8th January 2012, 12:28 AM   #31
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
Did you check U100-U107 for DC offset?
  Reply With Quote
Old 16th January 2012, 05:43 PM   #32
diyAudio Member
 
seankane's Avatar
 
Join Date: May 2010
Location: Washington State
Yes I did and they had none but I will re-check today since I made an error in my last pin configuration when checking the others. Just to double check and confirm.
__________________
Pyramid 52 Amp Power Supply----Fluke 787 Processmeter----Tektronix 465 Scope----Velleman HPS40 Scope----Soldering Iron----Desoldering Iron----Hejet HJ 500-S Heatgun----DM4070 Digital LCR Meter----Propane Torch
  Reply With Quote
Old 16th January 2012, 11:17 PM   #33
Dr Zeus is offline Dr Zeus  United States
diyAudio Member
 
Dr Zeus's Avatar
 
Join Date: Oct 2010
I had a similar issue with one of these amps. I somehow get the feeling people try to over-drive the input on these with bass boost, eq boost, full gain, and easy clipping. Something tells me the TL072 opamps cant take that much abuse, possibly due to regulated voltage levels or lack of protection on the opAmp inputs.

I even found one time that DC offset wasnt an issue, but the sound passing through was. If you throw a sine wave through the RCAs, you should be able to see the same wave of different amplitude on your scope; that is depending on the crossove and switch settings. In any case, if you have a sine wave on any of the opamp input pairs or outputs, then all 3 audio pins on that side of the opAmp should likely read something of the inputed sine wave. Again, I've found at least one case where a stuborn opamp had sound on input pins but nothing on output - not even DC, and the opamp was bad.
__________________
| Fluke 10 | Ramsey BS-601 | Topward 8102 | RS MiniAmp | Pyramid PS-15KX | DieHard |Big A$$ Resitor |

Last edited by Dr Zeus; 16th January 2012 at 11:23 PM.
  Reply With Quote
Old 17th January 2012, 12:08 AM   #34
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
These amps have problems with DC offset in the op-amps because there are so many in series and any amplification boosts the offset from the previous stages.

The op-amp will only have signal on all 3 pins of one channel if the non-inverting input has signal driven into it. If the non-inverting input is grounded (and therefore has no signal) and the input is fed into the inverting input, there will only be signal on the output of the op-amp unless the op-amp is driven into clipping. Then you may see signal on the inverting input but it will likely be very distorted.
  Reply With Quote
Old 12th August 2012, 06:43 PM   #35
diyAudio Member
 
Join Date: Jul 2012
I have one of these amps T-30001bd which currently blew on me. I opened it up and from what little I believe 8 mosfets look like they opened up. The amp powers on just fine. just no sound. I talked to Rockford and that Quoted me $454 for repair. Is there anyone here that could repair this amp for me cheaper then that?
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Rockford fosgate 4.6 X mike49504 Car Audio 14 28th May 2011 03:35 PM
Rockford Fosgate BD10001 seankane Car Audio 61 21st May 2011 05:09 AM
Rockford Fosgate BD500 seankane Car Audio 2 14th May 2011 10:31 PM
Rockford Fosgate dtisme Car Audio 1 5th October 2010 11:39 PM
rockford fosgate p4004 mike49504 Car Audio 17 28th January 2010 07:27 PM


New To Site? Need Help?

All times are GMT. The time now is 11:36 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2