Kicker kx1200.1 amps (2) cut out under load - 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 10th April 2011, 10:15 PM   #1
diyAudio Member
 
Join Date: Apr 2011
Location: Clinton Township MI
Default Kicker kx1200.1 amps (2) cut out under load

I Have (2) kx1200.1, green pcb, 2002 production, and both amps have the same problem. They both jump into protect when slight load applied at 4ohm. after a few seconds it comes out of protect and plays for a second then repeats over and over. rail voltage will drop from 77vdc to 56 at which the amp will enter protect and open speaker relay. Anyone have this problem? or an idea what is wrong?
  Reply With Quote
Old 11th April 2011, 03:16 AM   #2
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
How low is the voltage dropping at the power/ground terminals?

Place the black meter probe on the ground terminal of the amp (not on the point where the ground wire connected to the vehicle).
  Reply With Quote
Old 11th April 2011, 05:09 AM   #3
diyAudio Member
 
Join Date: Apr 2011
Location: Clinton Township MI
Default 13.8

battery voltage stays steady at 13.8 vdc from positive and negative terminals while amp enters and exits protect mode
  Reply With Quote
Old 11th April 2011, 03:25 PM   #4
amptech is offline amptech  Scotland
diyAudio Member
 
Join Date: Jan 2009
Location: Glasgow
Send a message via MSN to amptech
you can check service car amplifiers via computer psu's/bench power supply's...

I would apply signal to the amps in put now with out a load connected to the speaker end and place your meter on ac volts range and in turn adjust each level pot to test each channel and record the voltage's... never cross the power in put ground with the speaker ground connection... now power down and connect speaker loads and reapply the same test if it cut's out as you turn it up power of and replace the o/p transistors and check components within the power stage for shorts or open circuit readings..

possible faults are o/p transistors that have been stressed, broken level controls, power supply switching fet's and the pwm chip..check the large diode within the dc in put circuit.
  Reply With Quote
Old 11th April 2011, 03:27 PM   #5
amptech is offline amptech  Scotland
diyAudio Member
 
Join Date: Jan 2009
Location: Glasgow
Send a message via MSN to amptech
Carry out current tests with speaker load and then with speaker loads...
  Reply With Quote
Old 11th April 2011, 03:28 PM   #6
amptech is offline amptech  Scotland
diyAudio Member
 
Join Date: Jan 2009
Location: Glasgow
Send a message via MSN to amptech
was meant to say with out loads then with speaker loads...
  Reply With Quote
Old 11th April 2011, 05:32 PM   #7
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
Does the rail voltage drop if you have no speakers connected to the amp?

If you have speakers connected but no RCAs plugged into the amp, does the amp go into protect?

With no speakers or RCAs plugged into the amp, dies the amp cycle into protect?
  Reply With Quote
Old 12th April 2011, 04:10 AM   #8
diyAudio Member
 
Join Date: Apr 2011
Location: Clinton Township MI
Thanks guys! I hope to find time to tomorrow to check out those leads. Day job keeps me from the repair work some days Thanks again. James
  Reply With Quote
Old 23rd May 2011, 12:26 AM   #9
diyAudio Member
 
Join Date: Apr 2011
Location: Clinton Township MI
Hello guys the amp will not go into protect until it is put to work with an input signal and speaker being drivin. I replaced 8 Irf3205's on one of the amps . even though they tested ok I had them to try and it didn't make any difference. any ideas?
  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
Another fried Kicker KX1200.1 olftboy Car Audio 25 5th September 2010 04:31 PM
Kicker kx1200.1 catfishermike Car Audio 3 18th April 2010 02:50 AM
Are there two PCB versions of the Kicker KX1200.1? midnightg35x Car Audio 9 8th April 2010 01:48 PM
Kicker KX1200.1 went up in smoke phil33875 Car Audio 10 25th March 2010 01:37 AM
Kicker KX1200.1 Class D blown mbates14 Car Audio 9 5th February 2010 04:00 AM


New To Site? Need Help?

All times are GMT. The time now is 12:03 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