Amp turning on without remote voltage.

catfishermike · 5th June 2010, 05:16 AM

I have a Kicker kx1200.1 that i am tinkering with.If I hook up the b+ and ground the light comes on and the relay kicks in.But it will do the same if you hook up just the remote and ground.
Maybe this is normal for this amp,I don't know.
All of the ps fets and outputs are removed.
Also get a spark when attaching b+ wire.I'm just trying to learn something here.Anybody got any ideas?

Perry Babin · 5th June 2010, 05:38 AM

Red board or green board?

catfishermike · 5th June 2010, 05:40 AM

Sorry Perry,I knew I should have specified that.It is the red board.

Perry Babin · 5th June 2010, 05:44 AM

Check Q01 near the TL494.

catfishermike · 5th June 2010, 05:50 AM

Does it have three legs on one side and a single leg on the other?
How would i go about checking it?DMM?

Perry Babin · 5th June 2010, 05:54 AM

Yes. Meter set to diode check. Check from leg 1-2, 1-3 and 2-3. The tab at the top is connected to the center leg.

None should read anything near 0v (meter reads voltage on diode check). Don't have voltage applied when checking the transistor.

catfishermike · 5th June 2010, 06:00 AM

Nothing is at zero.

Perry Babin · 5th June 2010, 06:15 AM

Can you remove it?

If you don't know how to remove it, apply additional solder to the three legs so that they'll bridge and you can heat all 3 at once. Heat them for ~2-3 seconds after the solder melts then move the iron to the tab and push the transistor toward the 3-legged side. Don't let is stick to the adjacent parts. If you have kapton tape, apply a strip of it over the adjacent so the transistor can't stick to the parts.

catfishermike · 5th June 2010, 06:26 AM

It is removed.

Perry Babin · 5th June 2010, 07:18 AM

Does it still power up?

5th June 2010, 05:16 AM	#1
catfishermike diyAudio Member Join Date: Apr 2010	Amp turning on without remote voltage. I have a Kicker kx1200.1 that i am tinkering with.If I hook up the b+ and ground the light comes on and the relay kicks in.But it will do the same if you hook up just the remote and ground. Maybe this is normal for this amp,I don't know. All of the ps fets and outputs are removed. Also get a spark when attaching b+ wire.I'm just trying to learn something here.Anybody got any ideas?

5th June 2010, 05:38 AM	#2
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Red board or green board? __________________ Links >> Basic Car Audio Amp Repair * Basic Car Audio Electronics * New Site * Basic Switching Power Supply Design * Basic Computer Skills << Links

5th June 2010, 05:44 AM	#4
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Check Q01 near the TL494. __________________ Links >> Basic Car Audio Amp Repair * Basic Car Audio Electronics * New Site * Basic Switching Power Supply Design * Basic Computer Skills << Links

5th June 2010, 05:54 AM	#6
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Yes. Meter set to diode check. Check from leg 1-2, 1-3 and 2-3. The tab at the top is connected to the center leg. None should read anything near 0v (meter reads voltage on diode check). Don't have voltage applied when checking the transistor. __________________ Links >> Basic Car Audio Amp Repair * Basic Car Audio Electronics * New Site * Basic Switching Power Supply Design * Basic Computer Skills << Links

5th June 2010, 06:15 AM	#8
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Can you remove it? If you don't know how to remove it, apply additional solder to the three legs so that they'll bridge and you can heat all 3 at once. Heat them for ~2-3 seconds after the solder melts then move the iron to the tab and push the transistor toward the 3-legged side. Don't let is stick to the adjacent parts. If you have kapton tape, apply a strip of it over the adjacent so the transistor can't stick to the parts. __________________ Links >> Basic Car Audio Amp Repair * Basic Car Audio Electronics * New Site * Basic Switching Power Supply Design * Basic Computer Skills << Links


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5th June 2010, 05:40 AM	#3
catfishermike diyAudio Member Join Date: Apr 2010	Sorry Perry,I knew I should have specified that.It is the red board.

5th June 2010, 05:50 AM	#5
catfishermike diyAudio Member Join Date: Apr 2010	Does it have three legs on one side and a single leg on the other? How would i go about checking it?DMM?

5th June 2010, 06:00 AM	#7
catfishermike diyAudio Member Join Date: Apr 2010	Nothing is at zero.

5th June 2010, 06:26 AM	#9
catfishermike diyAudio Member Join Date: Apr 2010	It is removed.

5th June 2010, 07:18 AM	#10
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Does it still power up? __________________ Links >> Basic Car Audio Amp Repair * Basic Car Audio Electronics * New Site * Basic Switching Power Supply Design * Basic Computer Skills << Links

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