Full-fledged Disassembly of the Krups EA89 coffee machine The Evidence series is a complex technical process that requires not only accuracy, but also a deep understanding of the design of automatic espresso machines. Owners of this premium model often face the need for deep cleaning when standard decalcination procedures stop helping and the machine begins to make extraneous sounds or give pressure errors.
This article is a detailed guide for those who are ready to conduct defectiveness and maintain your device on your own. We will consider removing the outer body, extracting the brewing unit, maintaining the hydraulic system and replacing critical seals that lose their properties over time.
Before starting work, it is necessary to understand that disassembly of the Krups EA89 This can lead to loss of warranty if there are traces of mechanical interference on the details. However, if the warranty period has expired, self-maintenance becomes an economically viable step, allowing you to extend the life of an expensive device for several years.
Workplace preparation and necessary tool
The organization of the workspace is the foundation of successful repairs. To work with Krups Evidence You will need a spacious table with good lighting, as inside the case there are many small plastic latches and fragile plumes. The lack of order can lead to loss of screws or damage to electronics.
You will need a specific set of tools that goes beyond the standard home screwdriver. The basis is a set of precision bits, including cross bits. PH0 and PH1, as well as flat screwdrivers with a width of 2-3 mm for careful snapping of plastic.
- 🛠️ A set of precision screwdrivers with magnetic tips for work in hard-to-reach places of the case.
- 🔧 Plastic blades (spoogers) for opening the body without damaging the paint coating.
- 🧴 Food silicone lubricant to restore the elasticity of seals and reduce friction.
- 🧼 A brush with hard bristles and rags to remove coffee oils and old lubricant.
Pay special attention to the lighting. Inside the hull Krups EA89 There are many darkened areas where moisture and dirt accumulate. The use of a headlamp or table lamp with an adjustable angle of inclination will greatly facilitate the visual control of the connections.
☑️ Preparation for disassembly
⚠️ Before starting any work, be sure to disconnect the device from the power grid and let it cool completely. Internal components, such as the thermoblock, can keep the temperature high even after switching off.
Dismantling the external enclosure and access to the insides
The process of removing the hull Krups EA89 It starts with the dismantling of removable elements: a pallet for drops, a water tank and a container for cake. After their removal, access to the main fasteners hidden under the decorative panels is opened.
The top cover is usually fixed with several screws located at the back and under the removable tray. Use a thin cross screwdriver to unscrew them without ripping the threads in the plastic seats. Act slowly as the plastic in older cars can become brittle.
Side panels are often held on a system of hidden latches. By inserting a plastic blade at the junction between the upper and side panel, it is necessary to carefully conduct it around the perimeter, freeing the locks. Sharp jerks are unacceptable here - they can break fastenerAfter that, it will be impossible to reassemble the body without gaps.
The Secret of Hidden Helices
In some Krups EA89 versions, two screws can be hidden under rubber legs at the bottom of the device or under a decorative sticker at the back. Always check the surface for hidden plugs.
After removing the sidewalls, the internal architecture of the machine will open in front of you. You will see the main frame, on which the pump, thermoblock and electronic control board are mounted. At this stage, it is important not to pull the wires and plumes connecting the control panels with the “brain” of the device.
Extraction and maintenance of the brewing block
The heart of any automatic coffee machine is the brew group. In the model Krups EA89 It is extracted through a service hatch, but for deep cleaning and lubrication of the guides often requires partial disassembly of the internal space.
To remove the block, it is necessary to bring the mechanism to the service position by turning the height regulator of the cake (if it is mechanical) or activating the appropriate mode through the menu, if the design allows. After that, the block is removed by moving on itself and up.
Visually inspect the condition teflon pistons. If you see deep scratches or scuffs to the metal, this may indicate a need to replace the O-rings or the block itself. The presence of coffee oils, turned into a solid plaque, is the main reason for poor extraction.
- ☕ Carefully rinse the brewing block with warm water without the use of aggressive chemistry.
- 🚿 Blow the internal channels with compressed air to remove fine coffee dust.
- 🧐 Check the condition of the spring mechanism - it should walk smoothly, without jamming.
- 💧 Lubricate the side guides and pistons seals with food-grade silicone lubricant.
It is important not to overdo it with lubrication. Surplus silicone They can get into coffee or collect a new batch of dust, which will lead to rapid contamination. Apply the lubricant in a thin layer, carefully distributing it over the surface of the seals.
Use only food-grade silicone lubricant approved for contact with food. Conventional technical lubricants can be toxic and spoil the taste of the drink.
Defection of the hydraulic system and pumps
Hydraulic system Krups Evidence includes a vibration pump, valves, silicone tubes and a thermoblock. It is here that most often there are problems with pressure, manifested in a weak stream of coffee or leaks inside the case.
First of all, examine the places of connections of silicone tubes with fittings. Under the influence of high temperatures and vibration, plastic can harden, and tubes can fall or crack. Any signs. microcrack The tubes require their immediate replacement.
The pump (pump) in this model is usually fixed to rubber dampers. Check their integrity: If the rubber has dried up, the pump vibration will be transmitted to the body, creating a strong noise. It is also worth checking the electrical contacts on the pump - oxidation can lead to pressure imbalances.
| Component | Symptom of malfunction | Action. |
|---|---|---|
| Silicone tubes | Leaks, air in the system | Replacement of tubes, inspection of fittings |
| Intake valve | Noise in water intake | Washing or valve replacement |
| Thermoblock | Does not heat water, temperature errors | Testing of TENS and sensors |
| Piston seals | Weak pressure, dry cake. | Ring replacement, lubrication |
Special attention deserves valve (solenoid). If it is contaminated with scale, the machine may hum, but not draw water into the system. It can be tried to wash with a solution of citric acid, having previously disassembled, but it is often more effective to install a new original component.
⚠️ Note: When working with hydraulics, make sure that all connections are tightened by clamps. High pressure in the system (up to 15 bar) can squeeze out a loosely attached tube, which will lead to flooding of the electronics.
Maintenance of thermoblock and removal of scale
Thermal block in Krups EA89 It is made of aluminum and is a complex system of channels. The main problem of this unit is scale, which reduces heat transfer and can completely block the water flow.
If the machine has stopped heating water or is not heating it enough, the problem may lie in the temperature sensor (NTC) attached to the body of the thermoblock. To access it, you will need to remove the thermal insulation casing. Be careful: the sensor wires are very thin and easily break when handled carelessly.
Mechanical cleaning of the thermoblock at home is difficult due to its design. However, if you find a leak from under the gaskets of the connection with the group, you need to replace it. heat-conducting And the O-rings. Old paste dries and ceases to effectively transfer heat from heat to water.
The process of replacing gaskets requires removing the thermoblock from the frame. Remember or take a picture of the order of connection of the tubes, so that during the assembly do not confuse the input and output. An error in connection can lead to the pump running "on closed water", which is dangerous for its motor.
Regular decalcination with special means creates scale, but does not remove the already existing solid deposits inside the aluminum channels of the thermoblock.
Electronics and sensors: diagnostics and cleaning
Electronic management boards in Krups Evidence It is located in such a way as to minimize moisture intake, but over time condensate and coffee dust can settle on the contacts. This is especially true for machines that are often washed under a stream of water or use aggressive chemistry near the electronics bay.
When the front panel is removed, you will get access to the display board and the main connectors. Visually inspect the board for swollen capacitors, traces of burns or oxidation of contacts. Any dark spots on the texture may indicate a short circuit.
Pay special attention to the tips (micro switches), which determine the position of the brewing block and pallet. If the machine “can’t see” the block or writes an “EMPTYSYSTEM” error when the tank is full, the problem is often the sticking or oxidation of these blocks. terminal.
- 🔌 Blow the plume connectors with compressed air to remove dust.
- 🧹 Carefully clean the contacts of the micro-switches with alcohol or a special contact cleaner.
- 👀 Check the integrity of the plumes for the presence of cracks and rubbing.
If you find traces of water hitting the board, in no case do not immediately try to turn on the device. It is necessary to thoroughly dry the board in a warm dry place for several days or wash it with distilled water followed by drying if there was contamination with sweet coffee.
⚠️ Attention: Static electricity can damage sensitive electronics. Before touching the control board, it is recommended to remove a static charge by touching a grounded metal object.
Assembly and initial launch
Assembly Krups EA89 is produced in reverse sequence. The main rule is not to use excessive force. If the part does not fall into place, then you missed something: did not insert a plume, did not align the guide or forgot the screw.
When installing the brewing unit, make sure that it is up straight and to the end. A characteristic click or a feeling of a dense landing will confirm the correctness of the installation. After assembly of the body, but before putting on external panels, it is recommended to conduct a test run.
Pour water into the tank and turn the car on. Carefully listen to the pump and watch the places of connections of tubes for leaks. If everything is dry and the machine is in readiness mode, you can complete the assembly by installing decorative panels.
What if the car does not turn on after assembly?
Check the connection of all the plumes to the control board. Often, when reassembling, they forget to snap the connector locks or rub a thin wire on the sharp edge of the plastic.
The first few cooking cycles are better to devote to washing the system. Prepare 2-3 cups of hot water without coffee to wash away any lubricant, dust or particles that may have gotten inside during repairs. Only then can you fall asleep fresh coffee and enjoy the results of your work.
How often should a coffee machine be completely dismantled?
Complete disassembly with the extraction of the brewing unit and cleaning of the hydraulics is recommended every 1-2 years, depending on the intensity of use (the number of cooked cups). Daily maintenance is limited to washing the pallet and rinsing the brewing unit underwater without chemicals.
Can I wash the block in the dishwasher?
Absolutely not. High temperature and aggressive detergents in the dishwasher can deform plastic parts, wash off special lubrication from seals and damage the Teflon coating, which will lead to rapid wear of the mechanism.
Which lubricant is best used for piston seals?
Use only food grade silicone lubricant (Food Grade Silicone Grease). It is inert, odorless and tasteless, safe in contact with food and does not destroy rubber seals, unlike petroleum products.
What does the System Empty Error mean after cleaning?
This error indicates that air has entered the hydraulic system or water intake is broken. It is necessary to carry out a procedure for removing air from the system (usually described in the instructions) or check the purity of the mesh in the water tank and the condition of the intake valve.