left channel won't work on JVC integrated amp

jon519 · 6th November 2011, 09:39 PM

I have an old JVC integrated amp that has an issue with the output. Only the right channel will work. It's been checked with different speakers so it is the amp.

I have my turntable hooked up and there is no sound out of the left speaker at all.

When I opened the amp I saw three fuses. I heard that some amps have fuses for the speaker outs but these fuses are not near where the outputs are/wires. one is for ac (using the amp as a power source) and the other two are near the front of the amp on the main board where there are caps, resisters etc..

anyway, I'm just looking for any pointers. It would be great if I could get it working again. It was a decent amp before the channel decided to go one day.

Meshuganah · 6th November 2011, 10:54 PM

Hi, What model number is this amplifier if I may ask?

counter culture · 6th November 2011, 11:00 PM

You've got 1 working channel. Work from input to output and check for differences in DC levels between channels.

Be careful, pins can be close together, one slip with the probe, short the wrong 2 together and you can end up with more problems than you started with.

jon519 · 6th November 2011, 11:01 PM

it's a JA-11G Stereo Integrated Amplifier

Meshuganah · 11:15 PM

In this series of amps JVC used monolithic output modules like STK060 (JAS55amp) these sometimes pack up and need to be replaced...not too hard, but you need to check the current limiting resisters too they are about 0.22 Ohms maybe 0.33 Ohms, 5watts. Modules are about $29.99 from WES Electronics in Aust. (try ordering through Jaycar, Altronics, one of those.)
You are right. the whole range of JAS amps from JVC were really good clean units. This one is not very powerful as far as I know but very clean sound. It would make a very nice preamp for something MUCH bigger.....Cheers

Meshuganah · 6th November 2011, 11:25 PM

Jon, You are looking for an STK0040 module. they are cheap enough to buy two.

Here is a link to the service manual.... Good luck.

JVC JAS11G Service Manual free download,schematics,datasheets,eeprom bins,pcb,repair info for test equipment and electronics

jon519 · 6th November 2011, 11:26 PM

thanks a lot. I'm not very good with servicing amps so I will save all this info and maybe sometime soon I can find someone I know who can help me do the repair.

Meshuganah · 6th November 2011, 11:36 PM

Where are you located?

jon519 · 6th November 2011, 11:40 PM

Guelph, On in Canada.

Meshuganah · 6th November 2011, 11:45 PM

Ah ha. There will be someone near by to help for a small fee if you order the parts first. Its a worthwhile fix.

6th November 2011, 09:39 PM	#1
jon519 diyAudio Member Join Date: Nov 2011	left channel won't work on JVC integrated amp I have an old JVC integrated amp that has an issue with the output. Only the right channel will work. It's been checked with different speakers so it is the amp. I have my turntable hooked up and there is no sound out of the left speaker at all. When I opened the amp I saw three fuses. I heard that some amps have fuses for the speaker outs but these fuses are not near where the outputs are/wires. one is for ac (using the amp as a power source) and the other two are near the front of the amp on the main board where there are caps, resisters etc.. anyway, I'm just looking for any pointers. It would be great if I could get it working again. It was a decent amp before the channel decided to go one day.

6th November 2011, 11:12 PM	#5
Meshuganah diyAudio Member Join Date: Jun 2006 Location: South East Queensland	In this series of amps JVC used monolithic output modules like STK060 (JAS55amp) these sometimes pack up and need to be replaced...not too hard, but you need to check the current limiting resisters too they are about 0.22 Ohms maybe 0.33 Ohms, 5watts. Modules are about $29.99 from WES Electronics in Aust. (try ordering through Jaycar, Altronics, one of those.) You are right. the whole range of JAS amps from JVC were really good clean units. This one is not very powerful as far as I know but very clean sound. It would make a very nice preamp for something MUCH bigger.....Cheers Last edited by Meshuganah; 6th November 2011 at 11:15 PM.

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6th November 2011, 10:54 PM	#2
Meshuganah diyAudio Member Join Date: Jun 2006 Location: South East Queensland	Hi, What model number is this amplifier if I may ask?

6th November 2011, 11:00 PM	#3
counter culture diyAudio Member Join Date: Jun 2011	You've got 1 working channel. Work from input to output and check for differences in DC levels between channels. Be careful, pins can be close together, one slip with the probe, short the wrong 2 together and you can end up with more problems than you started with.

6th November 2011, 11:01 PM	#4
jon519 diyAudio Member Join Date: Nov 2011	it's a JA-11G Stereo Integrated Amplifier

6th November 2011, 11:25 PM	#6
Meshuganah diyAudio Member Join Date: Jun 2006 Location: South East Queensland	Jon, You are looking for an STK0040 module. they are cheap enough to buy two. Here is a link to the service manual.... Good luck. JVC JAS11G Service Manual free download,schematics,datasheets,eeprom bins,pcb,repair info for test equipment and electronics

6th November 2011, 11:26 PM	#7
jon519 diyAudio Member Join Date: Nov 2011	thanks a lot. I'm not very good with servicing amps so I will save all this info and maybe sometime soon I can find someone I know who can help me do the repair.

6th November 2011, 11:36 PM	#8
Meshuganah diyAudio Member Join Date: Jun 2006 Location: South East Queensland	Where are you located?

6th November 2011, 11:40 PM	#9
jon519 diyAudio Member Join Date: Nov 2011	Guelph, On in Canada.

6th November 2011, 11:45 PM	#10
Meshuganah diyAudio Member Join Date: Jun 2006 Location: South East Queensland	Ah ha. There will be someone near by to help for a small fee if you order the parts first. Its a worthwhile fix.

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