Help, Mr. Perry Babin !! Orion 225 HCCA trouble - 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 31st January 2012, 07:45 AM   #1
Yusef71 is offline Yusef71  United States
diyAudio Member
 
Join Date: Jan 2012
Location: San Marcos, Texas
Default Help, Mr. Perry Babin !! Orion 225 HCCA trouble

Dear Sir, I recently did some repair work on an Orion 225 HCCA amplifier. Replaced some shorted output transistors and one audio Op-amp, however now I'm getting distortion coming from the right channel. Could another audio Op-amp be at fault, and if so, which one ? I replaced the first audio Op-amp chip in the center of the circuit board right below the two muting transistors. Any help would be greatly appreciated !!
  Reply With Quote
Old 31st January 2012, 12:53 PM   #2
Dr Zeus is offline Dr Zeus  United States
diyAudio Member
 
Dr Zeus's Avatar
 
Join Date: Oct 2010
You say the outputs were replaced? Did you check the drivers?

You may have the same thing I had in this thread here: Orion 2250 Gen II output help


Click the image to open in full size.
__________________
| Fluke 10 | Ramsey BS-601 | Topward 8102 | RS MiniAmp | Pyramid PS-15KX | DieHard |Big A$$ Resitor |
  Reply With Quote
Old 31st January 2012, 02:37 PM   #3
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
Which revision/gen is the amp?
  Reply With Quote
Old 1st February 2012, 11:10 AM   #4
Yusef71 is offline Yusef71  United States
diyAudio Member
 
Join Date: Jan 2012
Location: San Marcos, Texas
I believe it might be a 2nd generation version, I'm not sure. However another user on this forum posted pics that are identical to what I have' Here are his pics.

Click the image to open in full size.Click the image to open in full size.Click the image to open in full size.
  Reply With Quote
Old 1st February 2012, 01:21 PM   #5
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
Do you have a scope?

Is this the channel with the yellow speaker wire?

There are several 75 ohm resistors that tend to open or go out of tolerance. You should check any that are discolored.

The drivers are always suspect but they generally short causing the amp to draw excessive current.
  Reply With Quote
Old 2nd February 2012, 11:51 AM   #6
Yusef71 is offline Yusef71  United States
diyAudio Member
 
Join Date: Jan 2012
Location: San Marcos, Texas
Default Mr. Perry Babin, help please !! Re; Orion 225 HCCA Trouble

No, unfortunately, I don't have oscilloscope, and yes, it is the yellow wire that corresponds to the right channel. I've made a visual check of some resistors, and there is indeed a few that show discoloration. What color are the 75 Ohm transistors in question ? For thoroughness sake, where on the circuit board and what identifying numbers do the driver transistors have. I believe the amp might indeed be drawing excessive current as the toroidal transformer heats up, even when there load is applied to the amp.
  Reply With Quote
Old 2nd February 2012, 04:02 PM   #7
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
See attached image for the 75 ohm resistors.

The drivers will be MPSA06s and MPSA56s.

Do you have an amp meter on your power supply?

Do you have a current limiting resistor that you can insert in the B+ line.
Attached Images
File Type: jpg P1010006x.jpg (238.0 KB, 140 views)
  Reply With Quote
Old 4th February 2012, 03:50 AM   #8
Yusef71 is offline Yusef71  United States
diyAudio Member
 
Join Date: Jan 2012
Location: San Marcos, Texas
O.K., now the amp will not power up. It only turns on for a few seconds or a minute at the most. I checked pin No. 12 on TL747, it shows 13.9 V when the remote signal is applied. Also checked pin No. 9 and 10. They both show 5.4 V. There is no power, positive or negative, on the large emitter resistors. What could the problem be now ??
  Reply With Quote
Old 4th February 2012, 04:56 AM   #9
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
What is the DC voltage on the gate legs of the power supply FETs?
  Reply With Quote
Old 4th February 2012, 05:56 AM   #10
Yusef71 is offline Yusef71  United States
diyAudio Member
 
Join Date: Jan 2012
Location: San Marcos, Texas
Quote:
Originally Posted by Yusef71 View Post
O.K., now the amp will not power up. It only turns on for a few seconds or a minute at the most. I checked pin No. 12 on TL747, it shows 13.9 V when the remote signal is applied. Also checked pin No. 9 and 10. They both show 5.4 V. There is no power, positive or negative, on the large emitter resistors. What could the problem be now ??
Correction, that's the TL474, my bad
  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
to mr perry babin and anyone who can answer this question on repair russdeanlee Car Audio 9 27th December 2011 08:38 AM
Orion 225-HCCA av8rdav Car Audio 7 7th September 2008 05:50 AM
Perry Babin ORION 225 shallowfu Car Audio 8 17th October 2006 05:14 PM
Schematics for Orion HCCA 225 D.R. tobias_svensk Car Audio 1 3rd April 2005 07:46 PM


New To Site? Need Help?

All times are GMT. The time now is 05:36 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