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Kenwood RD-K501usb compact hi-fi

 
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watkins



Joined: 02 Nov 2007
Posts: 1
Location: italy

PostPosted: Fri Nov 02, 2007 4:41 pm    Post subject: Kenwood RD-K501usb compact hi-fi Reply with quote

i am in trouble with this compact hi-fi , no schematic found on the net .Failure :
some time in random time the device switch OFF and again ON without any apparently reason.It can work for 7 hours without problems and some time go in fail mode and again come back in normal function but never in permanent way.
I exclude bad solder joint or intermittent contact or overheating.In my opinion is a false power supply protection that cause fault :
does any body had similar problem with or there is a design fault ?
thanks for cooperation
francesco
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Justmanuals



Joined: 21 Aug 2004
Posts: 1949

PostPosted: Fri Nov 02, 2007 6:17 pm    Post subject: Reply with quote

This Parts & Service manual (including schematics) can now be purchased for $9.99 and downloaded immediately after payment from:
http://www.justmanuals.com/kenwood-mini-component-system-rxd501-501e-501w-551e-551w-571s-rxd701-701e-701w-p-15559.html
About 5mb

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vtech



Joined: 08 May 2006
Posts: 1264
Location: USA

PostPosted: Fri Nov 02, 2007 10:06 pm    Post subject: Reply with quote

Intermittent problems such as your description-- can be a real pain to spot. Doubt if it is related to a "design flaw". Are there any mechanical switches of any kind involved in operation of the unit? ---possibility? As far as protection, with the help of schematic, you can monitor any protection line.

In general, while there is always a possibility of electronic device failure, in consumer electonics, mechanical issues such as mode select &/or sense switches are usually the root cause of intermittent functions.
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PostPosted: Sun Nov 04, 2007 7:55 am    Post subject: Re: Kenwood RD-K501usb compact hi-fi Reply with quote

watkins wrote:
i am in trouble with this compact hi-fi , no schematic found on the net .Failure :
some time in random time the device switch OFF and again ON without any apparently reason.It can work for 7 hours without problems and some time go in fail mode and again come back in normal function but never in permanent way.
I exclude bad solder joint or intermittent contact or overheating.In my opinion is a false power supply protection that cause fault :
does any body had similar problem with or there is a design fault ?
thanks for cooperation
francesco
--HI---THAT ASIMPLE PROBLEM CAN U CHECK YOUR SPEAKER WIRING IT MIGT THERE HAD SHORT AND CHECK POWER AMPLIFIER IF THERE A HUMMING..IF HAVE CHECK YOUR POWER OUTPUT IC OR TRANSISTOR AND TRY TO PUT OTHER SPEAKER UNIT..BECAUSE IF A DEFECTIVE SPEAKER CAN CAUSE OF POWER PROTECTION MODE--THANKS FROM TEPHIL...EX KENWOOD TECHNICIAN-MHER
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Zvone
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PostPosted: Fri Jul 04, 2014 9:03 am    Post subject: Reply with quote

its faulty 32.768 crystal, marked X11 on the top board
gl replacing it
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