Internal Fuse keeps blowing on Merantz PM-32 - diyAudio
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Old 27th June 2004, 03:24 PM   #1
Joeb is offline Joeb  United Kingdom
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Question Internal Fuse keeps blowing on Merantz PM-32

I've had my amp for about 6 months and in the last week it has blown 3 internal power fuses. It has a T1.0A 250v fuse. The only components in the circuit before the fuse are the power switch and a capacitor. It usually blows when the amp gets turned on.

Will puting in a fuse with a higher amperage solve the problem or burn my house down?

J
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Old 27th June 2004, 04:09 PM   #2
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Little of column A, little of column B...

It is important to look on the back of the amp to see what fuse is required, I suspect the 1 amp fuse is a tad small especially when you consider inrush current at turn on. If the amp requires only a 1 amp fuse I would start by checking the capacitors in the power supply circuit, you may find 1 or more have become leaky causing the blown fuse at turn on.

1amp fuse does seem a little small, what is the output of the amplifier?
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Old 27th June 2004, 05:02 PM   #3
Joeb is offline Joeb  United Kingdom
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I think it's about 25w per chanel I bought it Ebay so I don't know the exact output. The fuse is correct as it matches whats printed on the circuit board.

Do you think changeing it to a slo-blo would work?
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Old 27th June 2004, 06:29 PM   #4
anatech is offline anatech  Canada
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Default Slow Blow

Hi Joel,
I bettcha the original fuse was a time delay type, or slow blow. This is a very common problem. As Frazzled suggested, check the back panel or the area around the fuse holder for the correct value.
-Chris
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Old 27th June 2004, 06:34 PM   #5
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anatech has made a really good point, try a slow blow, this will probably solve the problem.
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