Orion 280GX - 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 5th September 2006, 06:23 PM   #1
diyAudio Member
 
Join Date: May 2006
Default Orion 280GX

Hello

Like a moron I didnt pay attention to which way the negative side of a few of the 6 capacitors in the center of the amp face well there are 4 1000uf 50V caps and 2 1000uf 25 volt caps I know the 2 center 1000uf 50 volt caps the negative sides of the caps face each other but the other 4 I am not sure , I looked on amp guts and see a 275 sx and my 280GX has the same layout but not sure if those caps are situated the same and I cant make out the polarity on 1 of them in that picture can anyone please help me. again mine is the 280GX and on ampguts that 275sx is the same board I have minus the eq functions I know some other 280GX amps the board layout is different.


thank you
  Reply With Quote
Old 5th September 2006, 08:14 PM   #2
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
Square solder pads are almost always the positive terminal of the capacitor.
Attached Images
File Type: jpg orioncaps01.jpg (85.6 KB, 227 views)
  Reply With Quote
Old 6th September 2006, 07:15 PM   #3
diyAudio Member
 
Join Date: May 2006
1 more question

ther are on each side of the amp by where the power and ground go in and driectly oposite on the other side of the amp a mirrior image of 1 mps A06 and mps A 56 there is a resistor that connects to 1 of the outside legs of the mps A56 and on both sides the resisitor is burned beyond recognition sinc I see you have a pic of the capaitors, would you or anyone know the value of these 2 resistors as they are burned beyond the ability to tell.

Thanks Again
redblaze
  Reply With Quote
Old 6th September 2006, 07:34 PM   #4
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
The photos of that area the 275 I have are not good enough to tell. This photo and the next are of a 225. They should be the same if the layout is the same.
Attached Images
File Type: jpg orionresistors01.jpg (96.1 KB, 209 views)
  Reply With Quote
Old 6th September 2006, 07:36 PM   #5
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
The other side...
Attached Images
File Type: jpg orionresistors02.jpg (99.3 KB, 201 views)
  Reply With Quote
Old 7th September 2006, 05:26 AM   #6
diyAudio Member
 
Join Date: May 2006
that is exactly the same layout , just what I needed

Thank you
redblaze
  Reply With Quote
Old 9th September 2006, 01:19 AM   #7
diyAudio Member
 
Join Date: May 2006
Ok im stuck I replaced all power supply transistors with IRF2807
and replaced all 6 1000uf 50V caps , the 2 1000uf 25V caps I replaced the rectifiers with same , I replaced the 2N6488's with D613's and the 2N6491's with same, the a06 I used A42's and the a56's with A92's and when I apply power to test it the light turns on for a split second and then shuts off my powersupply , could this be the opamp ? what could i be missing by chance ?

thank you for your help
redblaze
  Reply With Quote
Old 9th September 2006, 01:35 AM   #8
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
Pull the rectifiers. Does it still pull enough current to shut down your power supply?

Make sure that there are no solder bridges on the rectifier's solder pads when you pull them.
  Reply With Quote
Old 9th September 2006, 01:50 AM   #9
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
P.S.

If your power supply is rated for more than 5-10 amps, you should have a current limiter or relatively small fuse (~10 amps) in series with the main power wire.

You should also have the transistors clamped down while troubleshooting. When there is a fault, they can overheat and fail within seconds.
  Reply With Quote
Old 9th September 2006, 02:45 AM   #10
diyAudio Member
 
Join Date: May 2006
I took out the rectifiers and put a 3amp fuse inline , the fuse did not blow and the amps powersupply started to sing (screech) , before the 3amp fuse would blow right away and without the fuse it shut the powersupply down ( yes current limiting) , but again without the rectifiers all seems ok but no power light , but I suppose this is because of the rectifiers not transferring power to the amp side ? Just the powersupply is turning on ?

Thank you for helping me
redblaze
  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
First gen 250 Orion SS64 Car Audio 8 6th January 2009 01:10 AM
First Gen 225 Orion SS64 Car Audio 13 14th December 2008 11:54 PM
Orion 250 amp mike49504 Car Audio 11 21st November 2008 04:45 AM
Orion 280GX amp repair thegmann Car Audio 11 11th April 2008 05:44 PM
Orion NT 200 vs Orion 2150 SX Clipped Car Audio 3 12th June 2007 01:55 PM


New To Site? Need Help?

All times are GMT. The time now is 03:45 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