Kenwood Amplifier KA 7020 Starting up Issues! - diyAudio
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Old 8th November 2007, 09:10 PM   #1
emsee is offline emsee  United Kingdom
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Default Kenwood Amplifier KA 7020 Starting up Issues!

Hi all Im new

I was wondering if anyone could help me with my problem well here it goes:

Ok I own a Kenwood KA - 7020 stereo integrated amplifier, which I have had for sometime which I use to play music from my PC, I have it connected to the pc with a stereo jack to phono wire. I have the phono wires in the cd input and the stereo jack in the sound card at the back of the pc. It has been working well for a long timel, but recently its giving me a problem which is; when I switched it on, it doesnt give any sound out through the speakers at all!
I have to keep switching it on and off so many times after switching it on and off laround 20 to 30 times it starts working!

Does anyone know whats going on? Whats causing this problem? Any help will be appriciated

Thanks!
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Old 9th November 2007, 07:53 PM   #2
emsee is offline emsee  United Kingdom
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help please
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Old 13th November 2007, 05:50 AM   #3
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This belongs in Solid-State, not here, but...

Does the Kenwood use a speaker relay? If so, you may be used to hearing a gentle 'click' a few seconds after power-up when it was working OK. A common problem is dried out capacitors or a weak relay driver transistor in the protection circuit.
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Old 14th November 2007, 09:49 PM   #4
emsee is offline emsee  United Kingdom
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Yes I do hear a click as soon as i press the power switch, but i still dont hear no sound from the speakers, i no its not the speakers becuase I have tired other speakers on this amplifier.

How do I check for out capacitors or relay driver transistors?
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Old 15th November 2007, 02:45 AM   #5
jaycee is offline jaycee  United Kingdom
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Just a thought - do you have any problems when the computer isnt connected to it? try some other source like a walkman or ipod or something.
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Old 18th November 2007, 04:36 PM   #6
emsee is offline emsee  United Kingdom
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Thank You for your reply, yes thats what i though could have been the problem when this first occured, however i did try other sources but the same problem occurs
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Old 18th November 2007, 06:10 PM   #7
jaycee is offline jaycee  United Kingdom
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Well... either the amp has too much DC offset and needs to be adjusted, or the DC protection circuit has gone faulty... probably the latter.
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Old 31st May 2008, 04:52 PM   #8
emsee is offline emsee  United Kingdom
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Quote:
With a service manual or at least a schematic we would probably be able to offer more help.

/Hugo

I dont quite understamd what you mean?
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Old 31st May 2008, 04:56 PM   #9
Mooly is online now Mooly  United Kingdom
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Hi, How did Netlist find this old thread--- Magic
Whats the relay you can hear click after a couple of seconds ? If the speakers are connecting to the amp if you put your ear to the tweeter you should be able to tell if the amps are at least connected- any hiss ? I would have thought a DC offset would hold the relay off-- no click.
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Old 31st May 2008, 08:57 PM   #10
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Quote:
Originally posted by Mooly
Hi, How did Netlist find this old thread--- Magic
Whats the relay you can hear click after a couple of seconds ? If the speakers are connecting to the amp if you put your ear to the tweeter you should be able to tell if the amps are at least connected- any hiss ? I would have thought a DC offset would hold the relay off-- no click.

Could be a faulty relay ?
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