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Old 17th December 2005, 08:20 PM   #31
bahc is offline bahc  France
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Join Date: Apr 2005
Location: Clermont-ferrand France
Smile GM-120 repairing

Hello everybody
I'm a "PIONEER enthusiast" and i have fixed a few of those amplifiers.
If you want help, you can describe the problem, and i will try to help you for repair.
First please check the voltage between the blue wire and the ground.
It's a very good device, and it's a great pity of throwing it away.
Sorry for my bad english
friendly wave from France.
Marc
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Old 21st December 2005, 09:19 PM   #32
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Join Date: Dec 2005
Location: Calgary
G'day all,

Found this thread when searching for some info. I have one of these old GM120 gems as well as the equalizer, casette deck, a pair of 6x9's. Had the tweeters, but they got ripped off the dash...this old unit sounded really good in my old chevelle back what seems like a hundred years ago, but I'd like to wire this unit up to my sons head unit. The only thing I'm short on is how to get that wiring harness apart and see what is what. I did find a bit of a schematic on another forum, but they wanted me to buy points or something to download it..........so stupid........anyway, if anyone has any more ifo on this I'd appreciate it.

Cheers,
max
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Old 9th January 2006, 05:04 PM   #33
Matschi is offline Matschi  Germany
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Default Pio GM 120

Hi there !
I also got a Pio GM120, but it don't switch on .
Can anyone please send me a scheme or a pinout or something.
Have You got any ideas what i can check? I want to bring it back to life.

PS: Sorry for my bad english

Matschi
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Old 9th January 2006, 05:47 PM   #34
bahc is offline bahc  France
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Default Gm 120

Hello Matschi
As i say in my post, please check the voltage between the blue wire and the ground, and check also the voltage you give to the amplifier.
I will help you.
Marc

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Old 9th January 2006, 05:47 PM   #35
bahc is offline bahc  France
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Default GM 120

Just a question i have forgotten, what kind of component you plug to the GM 120 ?
Marc
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Old 9th January 2006, 06:52 PM   #36
Matschi is offline Matschi  Germany
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Hi Marc !
Thanks for your help!
As signal source i tested many things, like home cd players or pre outs of my car radio , but i think the problem is that the amp doesn't switches himself on .
as remote I use +12V on the long orange wire . black as GND and red as +Vcc. For audio in there is a cable with two RCA / Chinch plugs.
Have you got a pinout for the Special connector?

Between the blue wire (from near the connector to the metal near the supply) and GND , there are 11-12 V

Greetigs from Germany
Matschi
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Old 9th January 2006, 06:52 PM   #37
Matschi is offline Matschi  Germany
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I forgot ,
How many Ampere takes your GM 120 in standby mode (switched on, no signal, no speakers)
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Old 9th January 2006, 07:36 PM   #38
bahc is offline bahc  France
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Default GM-120

In standby mode the amplifier do not need current, because the amplifier can run, only when a another device (Pionner Component),is plugged (to the big connector), he works when a electric consumption is detected.

So if you want to plug the GM-120 to another device (not Pionner Component), it's necessary to make a modification on the card, in this way the amplifier will be switched-on as soon as the power is on.

I will prepare for you a schematic with the broaching of the big connector, and the modification to apply, (only a resistor to add).

Can you give me your direct email, because i can not send you all the informations on the forum.

Good night
Marc

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Old 10th January 2006, 03:39 PM   #39
Matschi is offline Matschi  Germany
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Hi again !
Thank you very much for your work, i didn't know that its neccessary to plug a pioneer component to.
it would be great if you can send me a scheme for the modification and a pinout for the big connector.

Please send it to dare_d@freenet.de

Oh, and can you please say me what the thin orange cable is for ?


Matschi
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Old 11th January 2006, 03:22 AM   #40
Turiel is offline Turiel  Argentina
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Location: Martinez
Hi, I have a GM120 and will try install in my car.
I test the power on with a 1 Kohm resistor between blue and black cables.
Sorry for my english..

Regards from Argentina.
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