Orion xtr-2250 Jigsaw puzzle please help!

jordan_ciaramit · 11th May 2011, 05:16 AM

Ok I would like to start off saying I have spent about 14 hours over 3 days trying to find the answer to my puzzle. I have many of the pictures from the web saved which has helped but I need even more help.

I started repairing this amp 10 yrs ago when I was 16 then stopped b/c even though I didn't have much knowledge I knew that this amp was worth alot and I needed to stop while ahead. Now I have repaired over 100 amps since then and feel confident with my meter and scope I can work this out once I figure out exactly where everything I took off 10 years ago needs to go back.
Please excuse spelling and non-formatted text.

Perry Babin · 11th May 2011, 06:02 AM

Precisely what do you need to know?

Photos of the areas in question may be helpful.

jordan_ciaramit · 11th May 2011, 06:11 AM

I need to know the orientation of the output transistors on both rails and the pre-drives on that side of the board I cant see the part numbers on any of the pics I found.IMG_0167[1].jpg

IMG_0166[1].jpg

IMG_0165[1].jpg

jordan_ciaramit · 11th May 2011, 06:46 AM

I have all of the parts I removed, I also found some new tip31/32 so I must have been on the right track not bad for being 16 and not knowing how to even test a transistor. I dont trust that the output rail that obviously I removed and re-soldered(poorly) has the transistors in the right place, and not sure which transistors to put in the empty spots on the other rail.

Perry Babin · 11th May 2011, 07:11 AM

There are 4 output transistors that have never been removed (2N6491s?). There was one more of the same number next to those. The next 5 are the opposite polarity (2N6488s?). If you have one side correct, the emitters of the like-numbered outputs on the two sides will be connected together.

The base of the 6488 goes to the emitter of a NPN driver transistor. The base of the NPN driver goes to the collector of a PNP predriver. The basic circuit can be seen here:
http://www.bcae1.com/temp/orion01.swf

The values in the schematic will be a bit different but it should be close enough.

jordan_ciaramit · 11th May 2011, 07:41 AM

Thank you so much!!! it looks like I had put the output rail back in the right place at least.

jordan_ciaramit · 21st July 2011, 06:34 AM

I just replaced the missing mpsu07/57 on the orange channel. I also am concerned the last two transistors on the output rail may need to swap positions. I fired it up it idles around 2.5 amps and the orange channel has 45vdc coming out with no input connected.

Perry Babin · 21st July 2011, 06:51 AM

If these are the voltage regulators, The 6488 will have positive voltage on its center leg. The 6491 will have negative voltage on its center leg.

Dr Zeus · 21st July 2011, 01:43 PM

Are those MJE1503x good for pre/drivers in these amps? I know USAmp uses them and I need to place an order; so I'll order more if they are suitable.

Perry Babin · 21st July 2011, 04:53 PM

I've used them in Orion amps before and didn't have any problems. They're useful in a lot of other amps so it's something you should stock anyway.

11th May 2011, 05:16 AM	#1
jordan_ciaramit diyAudio Member Join Date: Oct 2006 Location: Franklin, Tn	Orion xtr-2250 Jigsaw puzzle please help! Ok I would like to start off saying I have spent about 14 hours over 3 days trying to find the answer to my puzzle. I have many of the pictures from the web saved which has helped but I need even more help. I started repairing this amp 10 yrs ago when I was 16 then stopped b/c even though I didn't have much knowledge I knew that this amp was worth alot and I needed to stop while ahead. Now I have repaired over 100 amps since then and feel confident with my meter and scope I can work this out once I figure out exactly where everything I took off 10 years ago needs to go back. Please excuse spelling and non-formatted text.

11th May 2011, 06:02 AM	#2
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Precisely what do you need to know? Photos of the areas in question may be helpful. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

11th May 2011, 07:11 AM	#5
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	There are 4 output transistors that have never been removed (2N6491s?). There was one more of the same number next to those. The next 5 are the opposite polarity (2N6488s?). If you have one side correct, the emitters of the like-numbered outputs on the two sides will be connected together. The base of the 6488 goes to the emitter of a NPN driver transistor. The base of the NPN driver goes to the collector of a PNP predriver. The basic circuit can be seen here: http://www.bcae1.com/temp/orion01.swf The values in the schematic will be a bit different but it should be close enough. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

21st July 2011, 06:51 AM	#8
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	If these are the voltage regulators, The 6488 will have positive voltage on its center leg. The 6491 will have negative voltage on its center leg. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

21st July 2011, 04:53 PM	#10
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	I've used them in Orion amps before and didn't have any problems. They're useful in a lot of other amps so it's something you should stock anyway. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links


	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

11th May 2011, 06:11 AM	#3
jordan_ciaramit diyAudio Member Join Date: Oct 2006 Location: Franklin, Tn	I need to know the orientation of the output transistors on both rails and the pre-drives on that side of the board I cant see the part numbers on any of the pics I found.IMG_0167[1].jpg IMG_0166[1].jpg IMG_0165[1].jpg

11th May 2011, 06:46 AM	#4
jordan_ciaramit diyAudio Member Join Date: Oct 2006 Location: Franklin, Tn	I have all of the parts I removed, I also found some new tip31/32 so I must have been on the right track not bad for being 16 and not knowing how to even test a transistor. I dont trust that the output rail that obviously I removed and re-soldered(poorly) has the transistors in the right place, and not sure which transistors to put in the empty spots on the other rail.

11th May 2011, 07:41 AM	#6
jordan_ciaramit diyAudio Member Join Date: Oct 2006 Location: Franklin, Tn	Thank you so much!!! it looks like I had put the output rail back in the right place at least.

21st July 2011, 01:43 PM	#9
Dr Zeus diyAudio Member Join Date: Oct 2010	Are those MJE1503x good for pre/drivers in these amps? I know USAmp uses them and I need to place an order; so I'll order more if they are suitable.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Old school Orion XTR 2250	DanielJ	Car Audio	28	28th October 2011 11:31 AM
Orion XTR 2250 OLD SCHOOL	wyteboy	Car Audio	2	10th April 2011 10:54 PM
Orion XTR 1400	NIM006	Car Audio	2	12th January 2009 02:11 PM
Orion XTR 2250, current hungry ?	Scanlines	Car Audio	4	16th December 2008 12:55 PM
Xtr 2250	shallowfu	Car Audio	8	24th October 2006 01:45 AM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read