Question about Audio Players & Recorders
The speaker protection relays may not be turning on or a power amplifier fuse may be blown. The most common cause for this is a shorted transistor in one channel. Look inside for fuses and check them with an ohmmeter. If one is blown, trace the circuitry from the fuse clips to the power transistors mounted on the back. When you identify which fuse terminal goes to the transistors, measure the resistance from this fuse clip to each speaker terminal. It should be a very high value or open. If it reads a low value (generally a fraction of an ohm), one or more of the transistors in that channel is bad. In that case, you should also check from the other fuse to the speaker terminals to make sure the complementary side transistors for that channel are still good. DO NOT replace the fuse until you are sure there are no shorted transistors. The preceding tests are done with the receiver unplugged.
Likewise, if the amplifier remains in standby mode when you turn it on but the fuses are good, it may have an offset detection circuit that locks out the speaker relays if an output transistor is shorted.
The next possibility is the audio source switch has a problem, but it seems unlikely that would knock out both channels on all sources.
Posted on Apr 04, 2011
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Posted on Jan 02, 2017
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