Before replacing internal 20mm fuses in your equipment with our Russ Andrews Internal Fuses or Internal SuperFuses, ensure that it is disconnected from the mains supply.
Be aware that there are two types of internal fuses - type T (slow blow) and type F (fast blow). Check your original fuse before fitting; you need to replace your fuse with a Russ Andrews Internal Fuse or Internal SuperFuse of the same type. The value of the fuse will be stamped on it; you may need a magnifier to see it. Slow blow fuses will be prefixed with a T e.g. T 3.15A denotes a 3.15A slow blow fuse.
Only replace fuses on a 'like for like' basis. If your equipment is fitted with a 2A fuse, you must replace it with a 2A fuse. Fitting a fuse of higher or lower value may cause inferior sound quality or present a safety issue.
Internal fuses are found in three places.
1. The first is inside the IEC socket and is accesssible from the outside of the equipment. First, remove the mains cable and disconnect the component from the mains supply. You will see the fuse holder underneath or to the side of the IEC socket.
A small screwdriver is quite useful to pop out the holder so you can replace the fuse.
2. The second place is a fuse holder mounted on the back panel. Again a small screwdriver is often useful to unscrew the holder. Please make sure the equipment is disconnected from the mains.
Once the holder is loosened it will give you access to the fuse.
3. The last area is inside the equipment which will involve taking off the lid. Before doing so remember to disconnect your component from the mains supply.
Use an appropriate screwdriver to remove the screws holding the case to the chassis. The fuse is usually mounted before the transfomer and usually mounted on the circuit board near the back of the IEC socket.
Simply remove the fuse from its holder and replace.