Question about Audio Players & Recorders
SPEAKERS NOT FUNCTIONING
Posted by Anonymous on
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Posted on Jan 02, 2017
SOURCE: how do i remove the
Insert some sort of scrapper at bottom of speaker box where front grille and box joins and hit scrapper blade with rubber hammer to bring out grille because it is fixed very tightly with box.
Following images are scrapper and exploded view of speaker box that will help you.
Posted on Oct 27, 2010
SOURCE: MY MHC-GNZ7D MUSIC SYSTEM ONLY
One possibility is that the power-on speaker protection delay is stuck on. The most common cause of this is a shorted transistor in one of the power amplifier channels. In that case, you will need to replace the speaker driver transistors in that channel. I don't have service information on your particular model; it may use power amplifier modules rather than individual transistors.
The tricky part is identifying the amplifier power and speaker output terminals to test for this problem. To find a shorted output transistor, you need to measure the resistance between the output of each channel and the plus, then the minus power supply connections. There is a relay between the amplifier output and each speaker terminal on the back; this relay is turned off by the speaker protection circuit, so you can't measure from the speaker terminals. If you have a fried transistor, one of the tests will show a resistance of a fraction of an ohm. A good transistor will have a very high resistance or read open. This will be the case whether you have modular amplifiers or discrete transistors.
If you see a blown fuse, that is a strong indication that you do have a fried transistor. Sometimes the speaker protector circuit shuts down fast enough to save the fuse, but not always.
Posted on Apr 27, 2011
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