Working on a kenwood kac-921

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Sandre

Sandre

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Joined 2017
#1
Don't think I'll need help working on this one, problem is that it power on and plays audio when rocked from first glance I see a swollen capacitor going to clean up the board and check everything, then I'll repost my findings


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#2
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An externally hosted image should be here but it was not working when we last tested it.



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#6
Sandre said:
So I can't find any 4700 uf capacitor can I add a 3300 with a 1500uf in parallel to get 4700uf?
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You could, but 4700uF is a very common value.

However, are you sure it's faulty? - it's not usually a problem on these large reservoir capacitors, and from the picture it looks like it's just the plastic 'disc' which is domed (something you see quite a lot, and doesn't mean it's faulty).

I'm not quite sure what you mean by your fault description, but a common cause of intermittent audio (or intermittent distorted audio) on Kenwood amps is the input selector switch, or any other switches.
 
#7
Nigel Goodwin said:
You could, but 4700uF is a very common value.



However, are you sure it's faulty? - it's not usually a problem on these large reservoir capacitors, and from the picture it looks like it's just the plastic 'disc' which is domed (something you see quite a lot, and doesn't mean it's faulty).



I'm not quite sure what you mean by your fault description, but a common cause of intermittent audio (or intermittent distorted audio) on Kenwood amps is the input selector switch, or any other switches.
Click to expand...



I could use 2 in parallel and it'll work.. As well as your saying it could be the switches and potentiometer, when I check with a multimeter I get different readings


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#20
Does the amp have good fuses in it?

Is that transistor shorted or reading really low resistance from base to emitter (ohms, no power applied)?

If not, follow the circuit back to the next transistor. Black on emitter of that transistor, voltage on base and collector with power applied.
 
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