Orion 2150GX power draw - 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 16th May 2011, 03:26 AM   #1
Dr Zeus is offline Dr Zeus  United States
diyAudio Member
 
Dr Zeus's Avatar
 
Join Date: Oct 2010
Default Orion 2150GX power draw

Got this amp on my bench. It fails to power up with a 10A supply, but once I lift the center legs of the rectifiers it appears the power supply section is partially OK. The voltage directly across the lifter rect center legs is ~171vDC. However, the transformer coil gets warm to the touch after about 30 seconds.

I dont have all the latest equipment sometimes, so all I have for testing are 3 power supplys (5A, 10A, 35A) and a car battery. Using the 5A power supply, the amp draws it down to 9 volts with the center leg of rects lifted. With the 10A supply, the amp powers with 13.3vDC stabilized across the power wires. So, this amp idles with about a 5-10A draw and the rect center legs lifted.

I have not yet lifted the PCB out of the sync just because I want to be careful not to hurt any of the TO220s like past experience. I do not see pags where large Rectifiers are usually under the PCB like the 2150SX/2250SX.
  Reply With Quote
Old 16th May 2011, 03:42 AM   #2
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
171v would be well beyond what this transformer could produce. It's likely an error due to the ripple.

With the power transistors clamped to the heatsink and the 35 amp supply, how much current does it draw (rectifiers in the circuit)?
  Reply With Quote
Old 27th June 2011, 02:21 AM   #3
Dr Zeus is offline Dr Zeus  United States
diyAudio Member
 
Dr Zeus's Avatar
 
Join Date: Oct 2010
I'm back to working on this amp but have not made much progress. Theres definately some wierd things wrong with this amplifier. I still have the center legs of the rectifiers lifted because I'm now wanting to troubleshoot why the amp cannot be turned off via the remote wire. Once powered, I can even disconnect rem and the powersupply is still running full tilt. Also on this amp, there are two silver diodes mounted on top of each other in parallel which after a few minutes run so hot that it made me jump. I thought the heat was coming from the 2w resistor just next to them but it isnt the case.

Click the image to open in full size.
  Reply With Quote
Old 27th June 2011, 02:44 AM   #4
Dr Zeus is offline Dr Zeus  United States
diyAudio Member
 
Dr Zeus's Avatar
 
Join Date: Oct 2010
Now more wierdum. I re-attached the center legs of the rectifiers and was able to un-cooperativly get the amp to power up and produce +-40rail voltage at the output fets. The way I got the amp to power up may be more to do with my power supply not being able to provide the amp some kind of high-amperate burst to start because it took about 15 power-cycles of my supply to get this amp to stay online. Dont ask me how I figured that one out. With the rectifiers attached REM appears to be working OK as long as I leave the amp powered off for less than 3 seconds else its hard to power it back on again.

Theres no audio output, and it appears there is an upset of DC voltage on some of the opamp outputs. Once I find CT I may be able to further troubleshoot this amp.

Last edited by Dr Zeus; 27th June 2011 at 02:46 AM.
  Reply With Quote
Old 27th June 2011, 02:59 AM   #5
Dr Zeus is offline Dr Zeus  United States
diyAudio Member
 
Dr Zeus's Avatar
 
Join Date: Oct 2010
Boy, the more I fiddle with this amp tonight, the more it starts to make more sense. The reason why no audio was heard was because of bad RCA contacts as described on the CD. I lightly moved the center of the RCAs upward and now there is good contact. I was able to have the amp produce clean audio on both channels.

It seems the reason why this amp was no longer used was because of a gain pot in dire need of a cleaning and new wires for the male speaker plug.
  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
Rockford Power 400.4 slight draw Dr Zeus Car Audio 2 26th January 2011 06:09 PM
Advantage to constant current draw from power supply? jerluwoo Tubes / Valves 2 25th December 2010 11:00 PM
Orion 2150gx gain control problem CBR Car Audio 1 11th March 2010 09:15 PM
2150gx parts jbob30 Car Audio 12 4th October 2006 03:32 PM
Nuuk's buffer's current draw (and power supply) dsavitsk Chip Amps 0 16th April 2005 10:04 PM


New To Site? Need Help?

All times are GMT. The time now is 06:50 AM.


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