Behringer BX3000t Scematic or info - diyAudio
Go Back   Home > Forums > Live Sound > Instruments and Amps

Instruments and Amps Everything that makes music, Especially including instrument amps.

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 July 2012, 09:03 PM   #1
diyAudio Member
 
Join Date: Jan 2011
Default Behringer BX3000t Scematic or info

Hi, can anybody help me with this amp I have for repair. A schematic would help, but what I need to know is the type number of the thermistor that sits in the heatsink. There are 2 of them, they are coded TTC 050, but that can be many different values. One I have broken trying to get it out of the board (I have a replacement board which was supplied without any of the componants that attach to the heatsink.
If anybody can help out I would be most grateful.
Dave
  Reply With Quote
Old 10th July 2012, 12:55 AM   #2
Enzo is offline Enzo  United States
diyAudio Member
 
Join Date: Sep 2004
Location: Lansing, Michigan
On the B3000T I see two thermistors. COmponent number R7 and R8 on the board.

R7 is the bias thermal compensation. and is a 50 ohm NTC thermistor. Description is just NTC-500, Behr. part number: 804-15000-20589

R8 is the fan speed control sensor, and is a 100 ohm PTC thermistor. Description is PTC-101/01, Behr. part number: 804-21001-29294
  Reply With Quote
Old 10th July 2012, 06:32 AM   #3
diyAudio Member
 
Join Date: Jan 2011
Thanks Enzo, the replacement board was not fitted with those componants, I was told to transfer them from the old board. The PTC one fell to bits when I tried to get it out of the board, the leads were a "good fit" in the through plating.

Do you have any info on how to set up the presets, Vr1, Vr2 & Vr3 ?
  Reply With Quote
Old 10th July 2012, 08:03 AM   #4
Enzo is offline Enzo  United States
diyAudio Member
 
Join Date: Sep 2004
Location: Lansing, Michigan
VR1 is your bias, and it is adjusted like any other. I'd use a scope and watch my crossover notch. The cheap way is to monitor mains current at idle, advance the control from the coldest setting until the mains current just starts to ramp up with the adjustment, then back off a hair from that point. I am sure someone may have a favorite idle current through the ballast resistors, but I don;t like that method, I find it arbitrary. Are R13,14 6.8 ohm resistors? Spec says 140mv acros each.

The other two are current limiters and are probably best just left where they are.

This amp adjusts like the QSCs it resembles.
  Reply With Quote
Old 10th July 2012, 08:13 AM   #5
diyAudio Member
 
Join Date: Jan 2011
Thanks again Enzo. The resistors are indeed 6R8. Unfortunately I have to do something with the other 2 pots, it's a new board so they haven't been adjusted. I could measure the settings on the old board, not very scientific though!
  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
Pre amp scematic...help recks Solid State 16 31st March 2012 10:24 PM
kicker DX700 scematic/help AKHeathen Car Audio 2 9th March 2012 07:58 AM
Excel for Behringer DCX Info jtwrace Software Tools 2 6th November 2011 10:00 PM
Behringer SRC2496 mod info needed data Digital Line Level 8 1st June 2009 07:01 PM
6V6GT scematic, any good, comments? ak_47_boy Tubes / Valves 8 22nd December 2006 06:58 PM


New To Site? Need Help?

All times are GMT. The time now is 03:44 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