Question about Audio Players & Recorders
Amplifier won't play any sound. Fuses are blown.
When a fuse blows it means an overload in either the power supply or more likely the main amp section. The cause is a shorted transistor or IC. Chances are that the devices (one, more or all) attached to a big heat sink have failed.
Posted on Nov 21, 2013
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Posted on Jan 02, 2017
SOURCE: Denon PMA 520 fuse blown
Check that you are replacing the fuse with the correct type first. Fuses marked with a T following the rating are "slo blo" fuses and if a fast blow is used instead, it will fail again at turn on. Otherwise, the amp will have a fault occurring, probably in the output stages. You should refer this type of fault to a repair guy that knows HiFi. as this sort of repair needs an experienced touch.
Posted on Jan 11, 2008
It is common for manufactuers to label the fuses on the circuit board as to their values. If they are not labeled there you can try contacting the manufactuer or looking in your manual. You can tell if they are slow or fast blow by the internal wire, if its thin and straight its a fast blow, if its thicker and spiraled its slow blow.
Posted on Jun 06, 2009
The 2 BIAS resistors of 47kohm, R333 R334, replaced with new 1W resistors. 1 resistor was totally open and 1 resistor was 55k.
It were 1/2W resistors, replaced them with 1W resistors. Very low cost repair for a High End amplifier. Should live for another 10 years.
Posted on Jan 08, 2010
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