captainclock
Pacifist Otaku
Sandpaper would be worse because it would also affect the stuff around it not just the area I want to do, plus all I have sandpaper wise is 1500 grit sandpaper which would be too fine.
Kenwood KA-7300 Integrated Amplifier Issues
- Thread starter captainclock
- Start date
Sandpaper would be worse because it would also affect the stuff around it not just the area I want to do, plus all I have sandpaper wise is 1500 grit sandpaper which would be too fine.
captainclock
Pacifist Otaku
Ok then, try sand paper. I don't think you could really hurt it. It is very repairable but if your fingers are not up to it then maybe see if someone else can do it for you. I can!Send it to me! :yes:
I would only send it to you if you were to pay for the shipping because this thing weighs at least 60 pounds and that would cost at least $50 to ship, which I can't afford.
cademan
Lunatic Member
Tell you what. Hang onto it! When I get a few dollars up in this world, I will let you know. I have to use a magnifying lamp and magnifying lens nowadays to see anything anymore!
I just re-wired a circuit board where I had to re-do the entire trace frome left to right and all the connections in between. :yes:
I just re-wired a circuit board where I had to re-do the entire trace frome left to right and all the connections in between. :yes:
captainclock
Pacifist Otaku
Tell you what. Hang onto it! When I get a few dollars up in this world, I will let you know. I have to use a magnifying lamp and magnifying lens nowadays to see anything anymore!
I just re-wired a circuit board where I had to re-do the entire trace frome left to right and all the connections in between. :yes:
I mean if I actually had a halfway decent knife in my name I would of tried it myself but I don't sadly enough the closest things I have to "decent" pocket knives are an old rusty pocket knife from the 1940s that used to be my dad's and before my dad had it it was his dad's pocket knife but the blades on it are so stinken dull you couldn't even whittle a stick with it, and the other one I have is a key shaped multi-tool that has a knife blade, philips bit screw driver, bottle opener, standard blade screw driver and a seraded blade all on one key shaped multi-tool but the blades on it are kind of dull as well (not as dull as on my pocket knife but still pretty dull though) and I don't own any stanley knives either, I used to have a hobby knife but the blade broke on it so I threw it out.
captainclock
Pacifist Otaku
well I was able to use the key shaped multi-tool I have and used the blade on it to scrape off the protective layer off of the circuit trace near that transistor termination point and then took the transistor wire and tacked it down to the circuit trace that I uncovered and was able to get it up and running again, the only problem is that now the volume control is being a bit fussy now (it doesn't allow the audio to come out all of the speakers at the proper volume unless you have it above 1/4 volume) and I don't think that with the way this amplifier's volume control is made that the usual shot of deoxit is going to fix this issue... :sigh: 
captainclock
Pacifist Otaku
What are you talking about? This particular unit has a seperate Loudness control system seperate from the volume volume control system, this amp's loudness control system is a small 4 position pot that consists of an off, 1,2, and 3 position and it has nothing to do with the volume control.
cademan
Lunatic Member
Check the internal power amp itself. Use a separate preamplifier or CD player with a volume control, and plug it into the "MAIN-IN" jacks at the rear and if it has a separate/normal switch, switch it to separate.
This integrated amplifier can be used as a power amplifier only. Makes for a great system build.
This integrated amplifier can be used as a power amplifier only. Makes for a great system build.
cademan
Lunatic Member
No no, look at the volume control itself. If it has an extra soldering lug about half way on the pot itself, this is used as volume compensation after 12:00 or so on the volume pot. Then loudness control 1, 2, or 3 will make no audible difference after 12:00.
captainclock
Pacifist Otaku
Don't have a preamp, and the only CD Player I have that has a volume control pot on it is an old Kenwood CD Changer from the late 1980s but the volume control pot is for the headphone jack only I believe so it wouldn't affect the audio going through the RCA Jacks. I have a walkman style tape player which has its own volume controls and my LCD Projector I'm running the audio through this Amp has its own volume control but I don't know how well it would work running them straight through the amplifier. Also this does have a seperate, and normal switch on the back which I did monkey around with before and it seemed to be working fine.
captainclock
Pacifist Otaku
Where at though? this unit has an integrated Balance control/volume control pot system.
cademan
Lunatic Member
The loudness compensator circuit is just part of the preamp circuit. It controls your loudness controls 1, 2, and 3 and is connected to the volume control via the loudness tap or (I called it) a lug.
Was it working before your transistor replacement? I think I would carefully look to see that nothing is shorted or missed.
Also, make sure your replacement transistors BCE are the same as the one's on the circuit board. I had bought some a few years back which were factory made just the opposite of the originals. I had to double check that one. Learned something new that day!
Basically anything with a volume control can be used with your Kenwood amplifier when using the "MAIN-IN" jacks. This way your Kenwood becomes a power amplifier only, just like the kinds you see or hear about that have no controls. Just RCA inputs and speaker outputs.
Was it working before your transistor replacement? I think I would carefully look to see that nothing is shorted or missed.
Also, make sure your replacement transistors BCE are the same as the one's on the circuit board. I had bought some a few years back which were factory made just the opposite of the originals. I had to double check that one. Learned something new that day!
Basically anything with a volume control can be used with your Kenwood amplifier when using the "MAIN-IN" jacks. This way your Kenwood becomes a power amplifier only, just like the kinds you see or hear about that have no controls. Just RCA inputs and speaker outputs.
captainclock
Pacifist Otaku
The loudness compensator circuit is just part of the preamp circuit. It controls your loudness controls 1, 2, and 3 and is connected to the volume control via the loudness tap or (I called it) a lug.
Was it working before your transistor replacement? I think I would carefully look to see that nothing is shorted or missed.
Also, make sure your replacement transistors BCE are the same as the one's on the circuit board. I had bought some a few years back which were factory made just the opposite of the originals. I had to double check that one. Learned something new that day!
Basically anything with a volume control can be used with your Kenwood amplifier when using the "MAIN-IN" jacks. This way your Kenwood becomes a power amplifier only, just like the kinds you see or hear about that have no controls. Just RCA inputs and speaker outputs.
Yes the replacement transistors were exactly like the originals in how the pinouts were done, I double checked the spec sheets and everything and they were both PNP BCE Transistors. so there was no miswiring, because if it was miswired I wouldn't be getting any audio at all, and I'm getting audio.
Also the volume control I noticed is very noisy as in there's lots of static when you rotate the volume control knob the kind of noise you would hear because of a dirty and or coroded contacts in the pot that might be causing my issues but I can't seem to get my can of deoxit to spray into the volume pot because for some reason or another my can of deoxit refuses to spray in the horizontal position. Also those terminals you were referring to on the volume control that went to the loudness compensator circuit were both occupied with wires, they weren't empty, so they're obviously wired up correctly.
So I think it might just be that the volume control's contacts just need to be cleaned with some deoxit or something like that.
captainclock
Pacifist Otaku
I'll have to go to radio shack tomorrow and see about getting some more deoxit and see if maybe spraying some deoxit into that volume control pot and working it back and forth fixes my problem.
SO as for using my amp as a power amp I have to plug my projector's audio output into the "main-in" jacks on the back and then switch the seperate/normal switch on the back to seperate? I'm assuming that using the poweramp feature I'm still able to use the volume, balance, and tone controls right, just not the loudness and rumble compensation switches?
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captainclock
Pacifist Otaku
Well it seems to work fine in Poweramp mode, the only thing is that none of the controls work the only way I can control the volume is through the Projector, I don't even have any tone adjustments, what's up with that?
cademan
Lunatic Member
It's because you are using just the power amplifier section in the Kenwood. The preamplifier section which includes the tone and volume controls won't work when using MAIN-IN.
This feature allows you to chain amplifiers together. I have three integrated amplifiers which have main in and pre out jacks and I am using only one to control all three. This is how they are designed to work.
captainclock
Pacifist Otaku
Well then if I'm using an LCD projector for the audio source then using this amplifier in power amp mode is basically useless because the audio output circuit on the projector has no tone or loudness compensation controls just a volume control and thats it. Id might as well use it with the preamp circuit and be done with it.
captainclock
Pacifist Otaku
OK then don't tell me to use it in power amp mode then!Well, yeah!
because you were telling me to use it in power amp mode.