RF 250m2 schematic - Page 2 - 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 19th December 2012, 05:47 AM   #11
diyAudio Member
 
seankane's Avatar
 
Join Date: May 2010
Location: Washington State
Did you get it?
__________________
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 19th December 2012, 11:11 AM   #12
diyAudio Member
 
Join Date: Sep 2009
Location: Wisconsin
Got the schematic, thanks.
__________________
BK 1544 40Mhz scope.....Pyramid PS-26KX supply.....Tenma 72-380 Func. Generator
  Reply With Quote
Old 19th December 2012, 06:44 PM   #13
diyAudio Member
 
seankane's Avatar
 
Join Date: May 2010
Location: Washington State
Did you read post #9?
__________________
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 19th December 2012, 07:16 PM   #14
diyAudio Member
 
Join Date: Sep 2009
Location: Wisconsin
I will look into that after work, thanks.
__________________
BK 1544 40Mhz scope.....Pyramid PS-26KX supply.....Tenma 72-380 Func. Generator
  Reply With Quote
Old 20th December 2012, 03:22 AM   #15
diyAudio Member
 
Join Date: Sep 2009
Location: Wisconsin
Quote:
Originally Posted by seankane View Post
Oh yes I forgot this does not have bass and treble pots. Do any of the switches ie: balanced/unbalance or the 0/180 or the 0/180/ez bridge have any DC on the casing?

There is a 0/180 switch for each channel and one of them is 0/180/ez bridge.

Sometimes these switches being bad can cause strange issues.

I am looking for the schematic now.
I found no DC on the shroud of the switch.

Adjusting the bias pot works.

Time to eliminate the shutdown circuits to see if that is the cause.
__________________
BK 1544 40Mhz scope.....Pyramid PS-26KX supply.....Tenma 72-380 Func. Generator
  Reply With Quote
Old 20th December 2012, 08:46 AM   #16
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
Do you see any damaged SMD capacitors?

Are Cx22 and Rx89 within tolerance?

Does loading it with a speaker or dummy load change the amplitude of the oscillation?
  Reply With Quote
Old 20th December 2012, 08:35 PM   #17
diyAudio Member
 
Join Date: Sep 2009
Location: Wisconsin
Loading the output causes it not work at all. I get a high pitched squeal then no output.

The resistor measures ok, no way to check the cap. It doesn't measure shorted.
__________________
BK 1544 40Mhz scope.....Pyramid PS-26KX supply.....Tenma 72-380 Func. Generator
  Reply With Quote
Old 20th December 2012, 08:43 PM   #18
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
Look at the signal on each end of the Rx89. If the amplitude of the oscillation is the same on both ends, the capacitor is open. If it appears to be open, you could connect another capacitor across it to see if it helps.
  Reply With Quote
Old 20th December 2012, 08:56 PM   #19
diyAudio Member
 
Join Date: Sep 2009
Location: Wisconsin
Quote:
Originally Posted by Perry Babin View Post
Look at the signal on each end of the Rx89. If the amplitude of the oscillation is the same on both ends, the capacitor is open. If it appears to be open, you could connect another capacitor across it to see if it helps.
Adding a cap helped. I get noise on the lower peak of the sine wave at a certain amplitude. I will try a different cap.
__________________
BK 1544 40Mhz scope.....Pyramid PS-26KX supply.....Tenma 72-380 Func. Generator
  Reply With Quote
Old 20th December 2012, 09:04 PM   #20
diyAudio Member
 
Join Date: Sep 2009
Location: Wisconsin
No load and the signal looks fine, cap made no difference of course.

Lifting D309 should disable the protection for the low side?
__________________
BK 1544 40Mhz scope.....Pyramid PS-26KX supply.....Tenma 72-380 Func. Generator
  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
RF T10001BD schematic brandes.cm Car Audio 10 31st March 2013 05:29 PM
Rockford Fosgate Punch 250m2 seankane Car Audio 2 1st February 2012 04:21 AM
Looking for RF T40001.bd Schematic codegen Car Audio 2 28th November 2011 03:03 AM
Rockford Fosgate 250m2 seankane Car Audio 2 14th June 2011 11:00 PM
RF 500a2 schematic brandes.cm Car Audio 1 8th January 2010 07:54 PM


New To Site? Need Help?

All times are GMT. The time now is 03:13 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