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MCMC
Joined: 02 Feb 2002
Posts: 233
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 12 Feb 2005 5:05 Pioneer Gm 120 amp |
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Hi all
This is a Service Manual "Schematic" of OLD Pioneer Gm 120 amplifier
Regards
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hotwaterwizard
Joined: 26 Apr 2004
Posts: 145
Helped: 11
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| 21 Feb 2005 17:16 Re: Pioneer Gm 120 amp |
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Where?
I can not see it or download it?
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hotwaterwizard
Joined: 26 Apr 2004
Posts: 145
Helped: 11
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| 23 Mar 2005 8:38 Re: Pioneer Gm 120 amp |
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Here is a PDF Created from The First 3 Downloads.
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mekme
Joined: 25 Oct 2005
Posts: 1
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| 28 Oct 2005 8:35 Re: Pioneer Gm 120 amp |
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Any of this containing schematic over the GMBP (gm-8P?) module?
Could someone mail it to me ?
It would be awesome.
I have got one gm120amp from a oldfriend and i dont know how to complete the installation.
Best Regards
Martin
Last edited by mekme on 26 Feb 2007 9:02; edited 1 time in total |
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maximus01can
Joined: 21 Dec 2005
Posts: 1
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| 21 Dec 2005 23:49 Re: Pioneer Gm 120 amp |
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I have one of these old gems as well as the equalizer, 6x9's and deck, but the decks messed up. Just wondering if I can wire in a newer deck and use the GM120? don't have the manual or schematic and don't have enough points to get the PDF's located above in this post.............I'm new to this forum, but I'm not sure why you've got to earn points to make use of a useful forum like this.....JMHO
Cheer,s
Max
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Ciumegu
Joined: 27 Dec 2005
Posts: 1
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| 27 Dec 2005 18:07 Re: Pioneer Gm 120 amp |
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| Haw can i download the manual?
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safeharbor
Joined: 10 Mar 2006
Posts: 1
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| 10 Mar 2006 6:09 Re: Pioneer Gm 120 amp |
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| maximus01can wrote: |
I have one of these old gems as well as the equalizer, 6x9's and deck, but the decks messed up. Just wondering if I can wire in a newer deck and use the GM120? don't have the manual or schematic and don't have enough points to get the PDF's located above in this post.............I'm new to this forum, but I'm not sure why you've got to earn points to make use of a useful forum like this.....JMHO
Cheer,s
Max |
Did you ever find out how to hook it up to a non-component Pioneer unit? I'd like to hook my GM-120 up to a new Pioneer CD Player...just wondering which input wires are which to connect to the pre-out from my new CD player. I have snipped my component cord and see several colored wires, but don't know which ones are for L, R, +, or -. Any help would be great! Thanks. AJ
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wihe5a
Joined: 14 Dec 2004
Posts: 12
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| 28 May 2006 20:39 Re: Pioneer Gm 120 amp |
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| DO you have original complete service manual gm-120?
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TCVR
Joined: 25 Sep 2006
Posts: 1
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| 25 Sep 2006 23:07 Re: Pioneer Gm 120 amp |
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Hi safeharbor,
The componant cord you cut should have a sheilded cable in it with a red and a white wire in it, the shield goes the the shield of your rca outputs of your new deck, and the red is the right side, and the white is the left. Also if you download the first image the other person is so kindly offering it shows the pin layout for the signal in. I also have one of these that I am trying to hook up to newer compnants as well, but when all connected I cannot get the unit to power up, I even connected the brown wire to the orange remote signal wire in the hopes that it also needed to be hot to activate the unit, but no availe. Leaving me to wonder if the amp is not functional or there is some other trick to activating the unit, I was hoping someone on here had a service manual with a troublshooting section, but the only ones I see are just pcb layouts with some identifers. Hope I helped, and if anyone has any tips on getting the amp to power up ,I sure appreciate it., Thanks-TCVR
| safeharbor wrote: |
| maximus01can wrote: |
I have one of these old gems as well as the equalizer, 6x9's and deck, but the decks messed up. Just wondering if I can wire in a newer deck and use the GM120? don't have the manual or schematic and don't have enough points to get the PDF's located above in this post.............I'm new to this forum, but I'm not sure why you've got to earn points to make use of a useful forum like this.....JMHO
Cheer,s
Max |
Did you ever find out how to hook it up to a non-component Pioneer unit? I'd like to hook my GM-120 up to a new Pioneer CD Player...just wondering which input wires are which to connect to the pre-out from my new CD player. I have snipped my component cord and see several colored wires, but don't know which ones are for L, R, +, or -. Any help would be great! Thanks. AJ |
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B0b
Joined: 19 Feb 2007
Posts: 2
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| 19 Feb 2007 12:35 Re: Pioneer Gm 120 amp |
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Hi,
Just looked at the schematics above, but wonder what 6 goes to? I guess 1,5,8 is the sheilding, but what of pin 6?
Anyone help, please?
Thx muchly.
Added after 1 minutes:
Sorry, forgot to ask, anyone know how I can get a DIN connector? P/N or WHY...
Thanks again.
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hotwaterwizard
Joined: 26 Apr 2004
Posts: 145
Helped: 11
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| 08 Mar 2007 6:30 Pioneer Gm 120 amp |
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My Guess is B+ in = Power to the Amp
B+2 = Turn on voltage
But E confuses me it goes to the Base of the Darlington. it may be a turn on for an EQ
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hotwaterwizard
Joined: 26 Apr 2004
Posts: 145
Helped: 11
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lopas
Joined: 08 Jul 2007
Posts: 2
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| 08 Jul 2007 16:16 Re: Pioneer Gm 120 amp |
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| i have this amp too, and i want to connect it to my stereo, but i don't know how it works..
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matyy
Joined: 19 Oct 2007
Posts: 1
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| 19 Oct 2007 7:11 Pioneer Gm 120 amp |
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thankesss
Added after 40 seconds:
i have this amp too, and i want to connect it to my stereo, but i don't know how it works..
Added after 36 seconds:
http://www.bcot1.com/gm120/
Added after 4 hours 37 minutes:
Haw can i download the manual?
Added after 46 seconds:
Haw can i download the manual?
Added after 14 seconds:
Haw can i download the manual?
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hotwaterwizard
Joined: 26 Apr 2004
Posts: 145
Helped: 11
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hotwaterwizard
Joined: 26 Apr 2004
Posts: 145
Helped: 11
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| 21 Oct 2007 20:11 Re: Pioneer Gm 120 amp |
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Here is what I came up with from the Schematics.
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hotwaterwizard
Joined: 26 Apr 2004
Posts: 145
Helped: 11
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| 26 Oct 2007 15:40 Re: Pioneer Gm 120 amp |
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Look what I found!
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bogdanel
Joined: 05 Mar 2005
Posts: 1
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| 03 Jan 2008 4:08 Re: Pioneer Gm 120 amp |
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Hello
For all Pioneer amps about that age, there are two issues connecting them to recent car audio system.
The fist is the amplifier remote signal. Nowadays system use a 0V/12V signal, generated by the source, for the amplifier. Most of those amplifiers use a PNP transistor, that senses the current consumed by the source (cd or deck or other). In order to address the issue, one might connect the B+ or ACC signal of the source to the pin 6 of the amplifier. Another solution (that i prefer) is opening the case, soldering a wire to the collector of Q38, and this wire acts now as a standard amp remote. The measured current on this wire is about 25mA, and it safe for most of modern car source.
Another issue is the sensitivity of the amp. For this amp, it is about 80mVeff, and can be transformed to about 600mV by placing a 270 to 330 ohm resister in parallel to muting transistors, Q23 and Q24.
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hotwaterwizard
Joined: 26 Apr 2004
Posts: 145
Helped: 11
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| 03 Jan 2008 4:47 Re: Pioneer Gm 120 amp |
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Like This?
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Mornay
Joined: 09 Feb 2008
Posts: 1
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| 09 Feb 2008 21:51 Re: Pioneer Gm 120 amp |
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| bogdanel wrote: |
Hello
Like to know what the plug pin 2 or "E" is used for when connecting to a new CD player? What do you mean when saying connect resistor parallel over Q23 and Q24 ( emittor to collector or base to collector )? Do you have any information on the same model equalisor to new CD player?
Thanx
For all Pioneer amps about that age, there are two issues connecting them to recent car audio system.
The fist is the amplifier remote signal. Nowadays system use a 0V/12V signal, generated by the source, for the amplifier. Most of those amplifiers use a PNP transistor, that senses the current consumed by the source (cd or deck or other). In order to address the issue, one might connect the B+ or ACC signal of the source to the pin 6 of the amplifier. Another solution (that i prefer) is opening the case, soldering a wire to the collector of Q38, and this wire acts now as a standard amp remote. The measured current on this wire is about 25mA, and it safe for most of modern car source.
Another issue is the sensitivity of the amp. For this amp, it is about 80mVeff, and can be transformed to about 600mV by placing a 270 to 330 ohm resister in parallel to muting transistors, Q23 and Q24. |
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buz11
Joined: 10 Nov 2006
Posts: 1
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| 21 Feb 2008 11:20 Re: Pioneer Gm 120 amp |
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I have attemped to Bogdanel modification for make that the amp switch on,but no results .
Ihave testing every semiconductor on the pcb so i don'understand why he don't swith on,either it is not clear for me the place of resostor in parallel whit muting transistor
How do we think
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sergiodirio
Joined: 15 Apr 2008
Posts: 1
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| 15 Apr 2008 17:23 Pioneer Gm 120 amp |
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hello! i'm from italy. i've found one of this 'toy' in onl box.
i want to run it but it can't switch on with orange cable on +12v
can anyone help me? i want to switch it on.
thanks:D
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houmadath
Joined: 10 Dec 2007
Posts: 1
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| 02 May 2008 16:32 Re: Pioneer Gm 120 amp |
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I got one of these units from a buddy of mine. he said that it doesn't turn on. When he had it in his car, it soulded pretty good. even at a meagre 50 watts.
I was wondering about B2. Is this an output to turn on another unit or something?
Sorry is this is a weird question, but I want to see if i could get it going without having to fork out a lot of cash for a techie to look at it.
Added after 24 minutes:
A couple other things. has anyone considered using this as part of a home entertainment system?
Can the amplifier be used in a bridged mode (maybe get around 140W mono)?
Has anyone considred replacing the transistors in the power supply section with mosfets to reduce the operating temperature and maybe improve efficiency?
Has anyone ever simply bypassed the inverter section and used a transformer in it's place?
What's the purpose of the 21.8V feed?
I was considering using the amp as a subwoofer amp in mono and building a subwoofer for my home theathre system that is being built piece by piece
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