Introduction
When the machine is open, replacing the brewing unit is quite easy. Actually, you just need to take out the panel under the water tank, but it's a little easier if you open the machine completely using this guide.
Tools
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Position the machine with the water tank side facing you.
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The panel covering the brew group is fixed at the top edge with two oval head screws.
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Remove the two oval head screws and lift the panel out.
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There it is: the brewing unit.
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The photo is from a Jura J5, but the brewing unit is basically the same and you can easily see how the brewing unit is attached:
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Two Torx T20 screws with fine thread
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One Torx T15 screw
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The hot water inlet is plugged in.
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The hose with the coffee spout is plugged on top.
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Unscrew the two Torx T15 machine screws.
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Unscrew the Torx T15 screw at the bottom of the hot water inlet.
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Pull the brewing unit out to you. The hose to the coffee spout is still attached at the top.
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Pull off the hose to the coffee spout.
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Start now with the replacement or revision of the brewing unit.
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If you want to disassemble the brewing unit for cleaning and installing new seals, follow this or this guides.
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There is one small difference with this brewing group: the drainage valve is fitted with a cover, but this is easy to remove. Unscrew the two Torx T8 screws.
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Use these instructions to overhaul the drainage valve.
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Work through the steps in reverse order to reassemble your device.