Internal Fuse keeps blowing on Merantz PM-32

Joeb · 27th June 2004, 03:24 PM

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

Frazzled · 27th June 2004, 04:09 PM

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?

Joeb · 27th June 2004, 05:02 PM

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?

anatech · 27th June 2004, 06:29 PM

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

Frazzled · 27th June 2004, 06:34 PM

anatech has made a really good point, try a slow blow, this will probably solve the problem.

27th June 2004, 03:24 PM	#1
Joeb diyAudio Member Join Date: Jun 2004 Location: London	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

27th June 2004, 04:09 PM	#2
Frazzled diyAudio Member Join Date: Apr 2004 Location: Regina, Saskatchewan	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? __________________ Anything worth trying is worth failing at once or twice.

27th June 2004, 06:29 PM	#4
anatech diyAudio Moderator Join Date: Jun 2004 Location: Georgetown, On	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

27th June 2004, 06:34 PM	#5
Frazzled diyAudio Member Join Date: Apr 2004 Location: Regina, Saskatchewan	anatech has made a really good point, try a slow blow, this will probably solve the problem. __________________ Anything worth trying is worth failing at once or twice.

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27th June 2004, 05:02 PM	#3
Joeb diyAudio Member Join Date: Jun 2004 Location: London	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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