Question about JVC FS-X3 CD Shelf System

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Mini hi-fi JVC CA-FSX3 stops after power on

After power-on the system stops responding. On the front display appears the message CD error -7,6V 13. 2-3 seconds after power on the system shows all OK, then stops. I disconnected CD with his control circuitry but even here the apparel shows the same message with another code
CD error -7,6V 17
I think it's something wrong with the power supply based on pulse-code converter, but I'm not sure. The visual investigation of the power source shows that it's looks like a diode SRS03 is burned and capacitors and resistors around have an superficial black smoke. Any help will be appreciated. Thanks in advance. Sincerely. Alfredo Kraus. Spain.

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Well, I disassembled the unit carefully. And I've found that diode SR303 was blown. It's very easy to find near huge pulse-code converter chip. This diode is used at power supply stabilization for amplifier that has a D-class i.e. pulse-code amplifier, and for CD part. Testing of this diode confirmed that it's dead. After a couple of days received the diode from shop, is very cheap. Changing the diode recovered all the functions of the unit. Now it works fine.
Resume: The diode was burned as a result of incorrect connection to line input. The owner of the unit haven't seen that a volume level was at maximum. The connection of line input overloaded the maximum current capacity of the diode and it was blown. As for it, I've seen that in that circuit in reality must be used a stabilization chip, that is not so cheap like a diode. I think it's a constructor's error to change the chip, that is overload protected, to a simple diode.
Waiting that my info will be useful because it´s a most vulnerable part of JVC CA-FSX3. And don't overload the amplifier!

Posted on Sep 10, 2009

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