Orion 2150GX Repair Help - 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 26th September 2012, 01:32 AM   #1
diyAudio Member
 
Join Date: Jun 2012
Location: Huntsville, Alabama
Default Orion 2150GX Repair Help

Okay I'm going to jump in feet first on this thread, first off I have to give a big shout out to Perry Babin. I purchased his "How to" material for repairing amps and just let me say that being an electrical engineer that has been tied to a desk job pushing papers for the past 12 years, it was some of the best how to material I have ever read and has inspired me to start getting back to what got me into electrical engineering in the first place (which is tearing into electronics and being able to fix them). I am currenly batting 4 for 4 on amp repairs. Now that the testimonial is over let me get to the heart of why I jumped on this thread.

My brother has placed the above amp in my hands to work on (the Orion 2150 gx). He told me that he had accidently shorted the power wire to ground and he has had a couple of people look at it (one guy replaced the 4 - 50 volt 3300uF capacitors in the middle of the board since they were swolen but was still not able to get it work, since then it has been siting around for about 15 years and is now on my bench.

I went into what I had learned from Perry's material and started checking the power supply section. None of the transistors were shorted. I moved over to the audio section and found the top channel bank was indicating a short circuit on both banks (the 4 parrallel PNP's and the 4 parallel NPN's). I worked the 8 transistors loose from the clamp and started soldering them off the board one by one until I found 1 out of the 4 NPN transistors to be bad and 1 out of the 4 PNP transistors to be bad. I decided to solder the other 3 NPN's and PNP's back into the board to see if I could power the amp and verify it would play with 3 out of 4 transistors in each bank. I powered the amp through my current limiting resistor (an old headlight) and 10 amp fuse and knew that something else must be wrong as the headlight illuminated and I was only getting around 6.5 volts of the power supply voltage to the amp. I used my O-Scope and saw a good looking square wave coming off the high voltage side of the transformer (although it did have some spikes at the leading edge of the waveform, kind of like an H pattern). I was also getting about + and - 12 volts at the rails (coming off what must be the rectifier near the middle of the board). I also noticed that I had about -10 volts DC on the channel that had the bad NPN and PNP transitor in it. I skimmed this thread and did not see any refernce to have DC voltage on the speaker channels, does anyone have a recommendation since this is my first old school amp. I am in this one just for the thrill of restoring an old amp. I saw the NPN and PNP transistors are still avalible through mouser for about a dollar a piece and I intend to replace each set of 4 on this channel. Also since it has been sitting around for about 15 years I was going to replace the 4 - 50V 3300uF Caps (~$9 a piece through mouser, ouch) and the 2-16V 3300uF Caps (~$5 through mouser). I wanted to get my shopping list of parts completed to save on shipping cost. Thanks in advance for any advice, I see we have some very knoledgable guys on this site and any help will be greatly appreciated. Also, Spoony I got to give you proops on getting this beast of an amp going again, nice work on the fab job for the side plates and good clean looking solder work in side the amp, I am hoping I can have success on this amp, would love to get my streak up to 5 for 5.
  Reply With Quote
Old 26th September 2012, 02:31 AM   #2
diyAudio Member
 
Join Date: Jun 2012
Location: Huntsville, Alabama
Tried to attach a pic this time
Attached Images
File Type: jpg IMG_0473.jpg (798.7 KB, 120 views)
  Reply With Quote
Old 26th September 2012, 03:48 AM   #3
kevinkr is offline kevinkr  United States
diyAudio Moderator
 
kevinkr's Avatar
 
Join Date: Sep 2004
Location: Boston, Massachusetts
Blog Entries: 6
Moved original post to new Orion thread, old thread has been closed to avoid further confusion.

Old thread here for reference: Old School Orion 2150 gx.I must repair this amp
__________________
"Extraordinary claims require extraordinary evidence." - Carl Sagan
  Reply With Quote
Old 26th September 2012, 04:21 AM   #4
diyAudio Member
 
Join Date: Jun 2012
Location: Huntsville, Alabama
Thanks for moving the thread and sorry for the confusion.
  Reply With Quote
Old 26th September 2012, 04:31 AM   #5
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
These old amps that have no power supply driver IC cannot be powered up through a limiter. You have to clamp the transistors and rely on the fuse for protection.

You may have defective driver transistors. Check the smaller transistors near the output transistors that failed to confirm that none are leaking and none are shorted.

The emitter of the drivers will be connected to the bases of the output transistors through a low value resistor.
  Reply With Quote
Old 26th September 2012, 02:25 PM   #6
diyAudio Member
 
Join Date: Jun 2012
Location: Huntsville, Alabama
Thanks, I am currently stuck at my day job, so I will troubleshoot those components this evening. My biggest fear on this amp is that hopefully any additional failed components will be readily available from a distributor like Mouser.
  Reply With Quote
Old 27th September 2012, 03:44 AM   #7
diyAudio Member
 
90scaraudio's Avatar
 
Join Date: Aug 2012
Location: ILLINOIS
I tried working on one of these a long time ago and was told to replace all the tantalum caps. (Circled in red) and I cant remember if the trans I circled are CEN-U07 and CEN-U57s. If they are and you need some, I have a handful of each. I also sketched a schematic as best as I could.

Let me know about the transistors
Attached Images
File Type: jpg a8.jpg (301.5 KB, 92 views)
File Type: jpg 2150gx.JPG (943.2 KB, 94 views)
  Reply With Quote
Old 28th September 2012, 12:11 AM   #8
diyAudio Member
 
Join Date: Jun 2012
Location: Huntsville, Alabama
Thanks for the feedback everyone. I was finally able to get back to troubleshooting on the orion and started looking at the driver transistors and it looks like the MPSU07 is showing shorted on two legs on the channel that had the blown transistors. From the looks of other threads on this type amp I am guessing this part is pretty much impossible to get these days. 90scaraudio, you wouldn't happen to have any of these 07's and 57's MPSU's laying around also? Is there any good equivalent that I could substitute? Also I went straight from my pyramid power supply through a 15 amp fuse earlier before finding this bad transistor and it immediately blew. If I solder out this bad 07 would it be safe to try and power the amp? I would like to at least hear the other channel play and see the amp power up. Again, thanks everyone for the help so far. I knew going in that finding parts was going to be my biggest hurdle on an amp this old.
  Reply With Quote
Old 28th September 2012, 12:15 AM   #9
diyAudio Member
 
Join Date: Jun 2012
Location: Huntsville, Alabama
Well, just as I posted that last I looked back at 90scaraudio's post and it looks like that transistor you mentioned is the same part, these have MPSU but I bet that CEN is the equivalent part, if so I am very interested in buying some off of you.
  Reply With Quote
Old 28th September 2012, 01:30 AM   #10
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
You can remove the drivers from the defective channel and apply power.
  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
Orion 2150GX power draw Dr Zeus Car Audio 4 27th June 2011 02:59 AM
Orion NT Repair AcuraTLSQ Car Audio 0 29th March 2011 12:22 PM
Help with Orion amp repair allorion Car Audio 13 16th September 2010 11:06 PM
Orion 2150gx gain control problem CBR Car Audio 1 11th March 2010 09:15 PM
Repair Help on Orion 2500d wccoug21 Car Audio 28 13th January 2010 03:25 AM


New To Site? Need Help?

All times are GMT. The time now is 07:43 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