ROCKFORD FOSGATE T1500-1 BD - Page 3 - 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 18th September 2012, 11:35 PM   #21
diyAudio Member
 
Join Date: Oct 2010
Perry: Have you been able to tell what these 4 transistors are doing in this circuit? (their function that is..)

Quote:
Originally Posted by Perry Babin View Post
The solder connections on the 4 large SMD transistors in this area fail. For testing, you can sometimes simply solder the connections in place. To make it reliable, the transistors need to be removed, the pads cleaned on the board and the terminals cleaned on the transistors.

Sometimes these transistors become intermittent. I've had at least one that checked bad in the board (open B-E junction) but checked OK out of the board so I'd advise checking them in the board as well as out of the board.

If they're readily available, I'd advise replacing them.

I've substituted TO-220 transistors in a few amps but haven't done enough to know if it's 100% reliable (although it should be). I've used 2N6488s and 2N6491s. The transistor shown is a 2N6491. The rest are NPN and would be subbed with the 2N6488 if necessary.
  Reply With Quote
Old 18th September 2012, 11:57 PM   #22
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
I think they're voltage regulators. If I'm not mistaken, they have pure DC on them. They're not used for any switching duty.
  Reply With Quote
Old 2nd October 2012, 05:17 PM   #23
diyAudio Member
 
josesony68's Avatar
 
Join Date: Feb 2011
Location: Caceres
Well, I've had the four transistors identical to the originals ...

I have replaced, and to connect the amplifier, this is what happens:
At first, everything seemed fine, (0.057 V at the speaker terminals) but when a minute passed, he began to hear a click intermittent (every second) coming from the area of the power supply, at the same time, the current in the speaker terminals, down to 0 V. ....

If I continue applying current to the amplifier, the click intermittent sound becomes long (rrrrrrrrrrrr) and in turn, the power LED flashes .....

Nothing warms, nothing burns ....

Is it weirder ...
Can there be another intermittent connection?
I can? I have moved some component while handling it?
  Reply With Quote
Old 2nd October 2012, 09:15 PM   #24
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
One of these came into the shop yesterday. After I repair it, I'll make a few measurements on various points and get back to you. If I forget and don't post in a day or so, bump the thread.
  Reply With Quote
Old 2nd October 2012, 09:45 PM   #25
diyAudio Member
 
josesony68's Avatar
 
Join Date: Feb 2011
Location: Caceres
Lucky you! I am forever grateful!
We keep in touch.
  Reply With Quote
Old 3rd October 2012, 11:19 PM   #26
diyAudio Member
 
josesony68's Avatar
 
Join Date: Feb 2011
Location: Caceres
Perry....
  Reply With Quote
Old 5th October 2012, 01:58 AM   #27
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
Do the solder connections on R2035 (large SMD resistor marked 130) appear to have overheated?

If so, apply new solder, desolder and resolder it. Does that help?
  Reply With Quote
Old 5th October 2012, 03:29 PM   #28
diyAudio Member
 
josesony68's Avatar
 
Join Date: Feb 2011
Location: Caceres
Sorry, Perry, no luck ....
I got the R2035, I've checked and I have reinstalled without success.

Is that there is no time to heat up ....
At 30 seconds, the voltage, down to 0V,,,
And continuing a noise near the power supply (rrrrrrrr)
I'll investigate to see exactly where it comes from, this little sound.

Or is there something else I can test, Perry?
  Reply With Quote
Old 8th October 2012, 01:54 AM   #29
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
If you have a scope, confirm that you have a continuous square wave on the center leg of the power supply FETs. With the scope set to 2ms and 10v/div, you should see a wide trace (~2.5 divisions high) that is unbroken across the display.
  Reply With Quote
Old 8th October 2012, 02:46 PM   #30
diyAudio Member
 
josesony68's Avatar
 
Join Date: Feb 2011
Location: Caceres
Well, the first picture is, just connect the amplifier and the second after 30 seconds.. Certainly in the second picture, waveform, stutters.. .
Attached Images
File Type: jpg DSCN3243.JPG (777.8 KB, 41 views)
File Type: jpg DSCN3244.JPG (773.1 KB, 37 views)
  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 T40001 BD Help scotts530 Car Audio 5 1st February 2012 06:01 AM
Rockford Fosgate BD 1000 mike49504 Car Audio 1 10th July 2011 10:54 PM
Rockford Fosgate bd 1000.1 Problem lukeman269 Car Audio 11 8th April 2011 10:35 PM
Rockford Fosgate T40001.bd - Schematic Request Jat40 Car Audio 8 1st June 2010 09:44 PM
rockford fosgate 1500 bd mike49504 Car Audio 18 30th December 2008 07:37 AM


New To Site? Need Help?

All times are GMT. The time now is 04:34 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