PPI A600 in protect mode - diyAudio
Go Back   Home > Forums > General Interest > Car Audio
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

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
Thread Tools Search this Thread
Old 29th March 2012, 04:53 AM   #1
diyAudio Member
Join Date: Jun 2007
Default PPI A600 in protect mode

I repaired this amp a few months ago with the help of this board and it had been working great. I've had it powering a single 10" JL W3 bridged mono at 4 ohms.

Last night was the first time starting the car after sitting for a couple weeks and I heard a high pitched whine from the back and thought at first that it was my fuel pump and that it seemed to be a tick louder than usual. I investigated and it sounded like it was coming from the sub. Then I looked in the trunk and saw that the "protect" light was on, in addition to the normal red LED.

Where should I focus my attention on troubleshooting this issue?
  Reply With Quote
Old 29th March 2012, 11:13 AM   #2
diyAudio Member
Join Date: Sep 2009
Location: Wisconsin
Verify battery voltage is high enough and then check the outputs for shorts. Move on to the supply fets, if all measure ok, power it up and check rail voltage.
BK 1544 40Mhz scope.....Pyramid PS-26KX supply.....Tenma 72-380 Func. Generator
  Reply With Quote
Old 29th March 2012, 04:33 PM   #3
diyAudio Member
Join Date: Nov 2003
Location: Louisiana
Don't apply power without the bottom cover tightly clamped onto the transistors. If it has a shorted output transistor, it could cause significantly more damage if the transistors aren't clamped down tightly.
  Reply With Quote
Old 29th March 2012, 04:33 PM   #4
diyAudio Member
Join Date: Dec 2005
Location: Northern California
Shorted outputs for sure by my experiences.

And Perry is correct no power to the amp without some clamping method to hold the power devices to the sink when the bottom is off. Especially the regulators just after the diodes they heat up quickly and fail in short order with proper clamping.

Last edited by 1moreamp; 29th March 2012 at 04:55 PM.
  Reply With Quote


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
Ppi a600 wondernutz Car Audio 12 30th November 2011 01:25 PM
Ppi a600 mike49504 Car Audio 3 21st March 2010 01:44 AM
PPi A600 noise MHFidelity Car Audio 5 29th September 2008 06:13 AM
Ppi A600 npenson Car Audio 4 27th August 2008 10:36 PM
Help....PPI 2360 won't come out of protect mode ??? kombos Car Audio 11 11th July 2007 01:20 AM

New To Site? Need Help?

All times are GMT. The time now is 11:09 PM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright 1999-2017 diyAudio

Content Relevant URLs by vBSEO 3.3.2