need some info on Pioneer KPX-9000 HU

ul9601 · 18th July 2010, 09:13 PM

Hi all,

I have a Pioneer KPX-9000 headunit but no amp to go with it (I'm led to believe GM-120 is the amp for it). Anyway, I'd like to hook it up to some other amp, so I need some (or any) info on the headunit - users' manual, service manual, schematics whatever.
Also, I'm planning to ditch the tape deck and build in an auxhiliary in jack for mp3 players.
Any help would be appreciated.
Cheers,
Sam

ul9601 · 22nd July 2010, 07:23 AM

After some research and looking at GM-120 amp schematics etc, I think I figured out the pin outs for the massive 9 pin DIN connector.
But there is another connector, looks like a 6 pin DIN socket, which seems to come out of tuner PCB board, and it has a removable plastic cap which shorts a couple of adjacent pins with the cap on.
Any idea what this might be?

By the way, reading a car stereo article on Popular Mechanic April '79 issue, GM-120 doesn't look like it was the standard issue for KPX-9000 - the photo looks different than GM-120 & power output s lower at 20 wpc RMS vs 35 (I think).

Thanks,
Sam

Perry Babin · 22nd July 2010, 03:29 PM

I think the jumper was to bypass the processor loop (which was to allow the use of an equalizer) but I'm not sure.

ul9601 · 22nd July 2010, 07:00 PM

ok - but what actually hooks up to the 6 pin DIN socket?
or is it just a jumper and nothing is meant to be plugged in?
9 pin DIN seems to have everything that needs to go to the amplifier, i.e. R & L (+ve) and a common audio ground, +12V, GND.
cheers,
sam

Perry Babin · 22nd July 2010, 08:52 PM

You'd plug in a pioneer equalizer, if I remember correctly. If you don't have an equalizer, you'd leave the jumper in place.

ul9601 · 22nd July 2010, 10:07 PM

Cool - thanks so much, Perry.
Cheers,
Sam

18th July 2010, 09:13 PM	#1
ul9601 diyAudio Member Join Date: Jul 2010	need some info on Pioneer KPX-9000 HU Hi all, I have a Pioneer KPX-9000 headunit but no amp to go with it (I'm led to believe GM-120 is the amp for it). Anyway, I'd like to hook it up to some other amp, so I need some (or any) info on the headunit - users' manual, service manual, schematics whatever. Also, I'm planning to ditch the tape deck and build in an auxhiliary in jack for mp3 players. Any help would be appreciated. Cheers, Sam

22nd July 2010, 03:29 PM	#3
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	I think the jumper was to bypass the processor loop (which was to allow the use of an equalizer) but I'm not sure. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

22nd July 2010, 08:52 PM	#5
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	You'd plug in a pioneer equalizer, if I remember correctly. If you don't have an equalizer, you'd leave the jumper in place. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

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22nd July 2010, 07:23 AM	#2
ul9601 diyAudio Member Join Date: Jul 2010	After some research and looking at GM-120 amp schematics etc, I think I figured out the pin outs for the massive 9 pin DIN connector. But there is another connector, looks like a 6 pin DIN socket, which seems to come out of tuner PCB board, and it has a removable plastic cap which shorts a couple of adjacent pins with the cap on. Any idea what this might be? By the way, reading a car stereo article on Popular Mechanic April '79 issue, GM-120 doesn't look like it was the standard issue for KPX-9000 - the photo looks different than GM-120 & power output s lower at 20 wpc RMS vs 35 (I think). Thanks, Sam

22nd July 2010, 07:00 PM	#4
ul9601 diyAudio Member Join Date: Jul 2010	ok - but what actually hooks up to the 6 pin DIN socket? or is it just a jumper and nothing is meant to be plugged in? 9 pin DIN seems to have everything that needs to go to the amplifier, i.e. R & L (+ve) and a common audio ground, +12V, GND. cheers, sam

22nd July 2010, 10:07 PM	#6
ul9601 diyAudio Member Join Date: Jul 2010	Cool - thanks so much, Perry. Cheers, Sam

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