Pioneer won't switch on (like dead)

AudioAddicted · 16th October 2006, 02:07 PM

Hi everybody.
I have a pioneer Power Amplifier for Car use.(it is supplied at 12V).
Well this amp came in my hands from a friend of mine. It is a used amp but it is really good. and I liked that gift. But when i connect it to the 12V power suply it doesn't make any thing at all.....just like dead..... No led turns on and there is no sound at the loudspeaker, it doesn't even warm up just a little bit (at the supply transistors and the amp FET-s. It works with PWM power supply in the DC/AC converter). Well i can not figure it out what to do with that. I really don't want to send it to rubish cause it is a real quality stuff. when i opened it up there were no signs of burns inside.Can u help me? Ill send u some photos tomorow for further detail. thanks in advance.

keith721 · 16th October 2006, 02:49 PM

Is there an additional line that should be connected to your head unit? Typically, these power amps get their voltage directly from the battery, but won't switch on unless they see power on a separate line. Typically, they use the same line that raises your power antenna.

Stocker · 16th October 2006, 07:14 PM

If it's labelled in english, there may be a terminal near the power connections called "remote", for the remote turn-on lead. When the head unit turns on this lead goes to "12V" and the amplifier senses the voltage and turns on. Jumper this to the 12V supply on the (+) and it should turn on if all else is well.

AudioAddicted · 16th October 2006, 07:16 PM

NO there is no other line to connect to the head unit.(U mean the remote control, don't u? The one that turns on the amp if connected to the positive pole of the battery). Usually it is suited between the positive and the negative pins of the supply in the amp. Did I understood that well? Correct me if I am wrong.
I am afraid there is something at the DC/AC converter in the supply unit of the amp and I really don't understand that mess. There are some of IC-s and plenty of little transistors there. Any one of them can be dead and I think I can not find which one without your help.

Sorry about the photos that I promised before but I had some trouble with the rechargable batteries of the camera. Something with the charger. I'll fix that tonight and the photos will be available the next morning.

AudioAddicted · 17th October 2006, 06:57 AM

Hello everybody,
As I promised yesterday, I brought some photos of my Pioneer.
I tried to connect it to a dual voltage transformer, as u can guess, +18v, -18v so that I could understand if the supply DC/AC converter had died too. (I have done that before successfully) well it wont give a sign of life even now. I think I have got to find a remote line to connect to the +12V but I can't find it. THEORETICALLY it should switch on after i connect it to the +12v.
Now it's in your hands. Help me please!!!

AudioAddicted · 17th October 2006, 06:59 AM

another photo

AudioAddicted · 17th October 2006, 07:04 AM

circuit photo

AudioAddicted · 17th October 2006, 07:10 AM

the back

AudioAddicted · 17th October 2006, 09:09 AM

Sorry I am new in this forum and maybe i am not posting at the right place, but I wanted to ask a simple question:
Which model of pioneer amp is the one on the photo below? Any identification code will be helpful.

Perry Babin · 17th October 2006, 11:58 PM

The amp appears to be the same as a Pioneer GM-1000/2000. It may be labeled differently outside of the US.

There is a 4 pin plug. The two center pins labeled acc and B/R need 12 volts for the amp to power up. Connect them to a 12 volt power source via a 3 amp fuse.

16th October 2006, 02:07 PM	#1
AudioAddicted diyAudio Member Join Date: Oct 2006	Pioneer won't switch on (like dead) Hi everybody. I have a pioneer Power Amplifier for Car use.(it is supplied at 12V). Well this amp came in my hands from a friend of mine. It is a used amp but it is really good. and I liked that gift. But when i connect it to the 12V power suply it doesn't make any thing at all.....just like dead..... No led turns on and there is no sound at the loudspeaker, it doesn't even warm up just a little bit (at the supply transistors and the amp FET-s. It works with PWM power supply in the DC/AC converter). Well i can not figure it out what to do with that. I really don't want to send it to rubish cause it is a real quality stuff. when i opened it up there were no signs of burns inside.Can u help me? Ill send u some photos tomorow for further detail. thanks in advance.

16th October 2006, 07:14 PM	#3
Stocker diyAudio Member Join Date: Dec 2003 Location: Austin	If it's labelled in english, there may be a terminal near the power connections called "remote", for the remote turn-on lead. When the head unit turns on this lead goes to "12V" and the amplifier senses the voltage and turns on. Jumper this to the 12V supply on the (+) and it should turn on if all else is well. __________________ Jesus loves you.

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16th October 2006, 02:49 PM	#2
keith721 diyAudio Member Join Date: Oct 2006	Is there an additional line that should be connected to your head unit? Typically, these power amps get their voltage directly from the battery, but won't switch on unless they see power on a separate line. Typically, they use the same line that raises your power antenna.

16th October 2006, 07:16 PM	#4
AudioAddicted diyAudio Member Join Date: Oct 2006	NO there is no other line to connect to the head unit.(U mean the remote control, don't u? The one that turns on the amp if connected to the positive pole of the battery). Usually it is suited between the positive and the negative pins of the supply in the amp. Did I understood that well? Correct me if I am wrong. I am afraid there is something at the DC/AC converter in the supply unit of the amp and I really don't understand that mess. There are some of IC-s and plenty of little transistors there. Any one of them can be dead and I think I can not find which one without your help. Sorry about the photos that I promised before but I had some trouble with the rechargable batteries of the camera. Something with the charger. I'll fix that tonight and the photos will be available the next morning.