Nespresso Essenza EF 470 User manual

en Service Manual Coffee Machine
EF 470
EF 471
Essenza

2
Service Manual EF 470 / EF 471 enVersion 1.1
Contents
Preface _____________________________ 3
Main Components__________________ 4
Overview ___________________________ 4
Overview of rating plates ______________ 5
Water circuit _________________________ 6
Technical data _______________________ 7
Operation___________________________ 8
Preparation _________________________ 8
Fill water system _____________________ 9
Making coffee ______________________ 10
Empty water system _________________ 11
Coffee machine status _______________ 12
Troubleshooting___________________ 13
Checking the machine on receipt ______ 13
Repair _____________________________ 15
General disassembly ________________ 15
Replacing thermoblock_______________ 16
Replacing NTC _____________________ 17
Replacing pump ____________________ 18
Replacing electronic control board with
button prints ________________________ 19
Replacing compact brewing unit (CBU) _20
Electronic control board, wiring diagram -
Europe (230V / 50 Hz) _______________ 21
Electronic control board, wiring diagram -
USA (UL, 120 V / 60 Hz) _____________ 22
Electronic control board, wiring diagram -
Japan (100 V / 50-60 Hz)_____________ 23
Descaling (1) _______________________ 24
Descaling (2) _______________________ 25
Measuring flow rate _________________ 26
Checking for leaks and pump
pressure (1) ________________________ 27
Checking for leaks and pump
pressure (2) ________________________ 28
Measuring coffee temperature ________ 29
Daily care and final cleaning __________ 30
Spare Parts ________________________ 31
Repair accessories __________________ 31
Spare parts EF 470__________________ 32
Spare parts EF 471__________________ 34
Notes ______________________________ 36

3
Service Manual EF 470 / EF 471 enVersion 1.1
Preface
The purpose of this Service Manual is to
provide the service personnel with all
necessary information with regards to correct
handling, maintenance and repair of the coffee
machines EF 470 and EF 471.
This manual should be used by the
technicians as a valuable aid to guarantee the
permanent readiness for use of the machine.
In order to take full advantage of all the
functions, it is absolutely necessary to follow
the instructions in this manual.
Please keep this manual together with the
corresponding service documentation. This
way you are assured to have the necessary
information.
For fast access to information directly from the
PC or MAC monitor, this manual is also
available on CD-ROM. The required utility
(Adobe Acrobat), also on this CD-ROM, runs
on PC and MAC computers.

4
Service Manual EF 470 / EF 471 enVersion 1.1
Main Components
Overview
1) Closing handle
2) Cover
3) Compact brewing unit (CBU)
4) Capsule inlet
5) Side panel
6) On/Off button
7) Coffee outlet
8) Coffee button, back lighted
9) Container for used capsules
10) Drip grid
11) Drip tray
12) Lower chassis
13) Thermoblock TB 2003
14) Electronic control board
15) Pump CP4-SP C2
16) Water tank connector
17) Upper chassis
18) Water tank
1
18
6
2
3
4
7
8
9
10
11
12
13 14
5
15
17
16

5
Main Components
Service Manual EF 470 / EF 471 enVersion 1.1
Overview of rating plates
The rating plate
- can be found at the underside of the coffee
machine,
- may be of varying design, depending on
the brand,
- carries the following information:
• Machine type
• Voltage and power rating
• Approval seal(s)
• Data matrix
• Serial number
• Bar code (Krups)
Serial number codification
Example: 0529 0074 7002 6100 018
05290 production date: 290th day of year 2005
07 machine partner codification
470 machine type
02 voltage / mains plug version
6 color version
1 production site
0001 incremental number per production day
8 checksum number
Typ:
MAGIMIX
NESPRESSO
Turmix
MADE IN EUROPE
0042699
1260W
60Hz
MADE IN SWITZERLAND
05290074 7002 6100 018
FR.6
HOUSEHOLD COFFEE MAKER
Type C90
LISTED 39C5
A.C.only
120V
1260W 50Hz
Fabriqué en Suisse
0042728
ref 11238
05290064 7105 5100 011
M100
220-240V
0040133
1260W 50Hz
MADE IN SWITZERLAND
05290044 7105 1100 014
KOENIG Capri 03161
220-240V~
KOENIG APPARATE AG ZÜRICH 17105
1260W 50Hz
MADE IN SWITZERLAND
0040624
TURMIX AG, 8645 Jona, Switzerland
05290084 7005 3100 019
220-240V~
TX100
17105
1260W50/60Hz
0040541
Type EN 90.R
05290014 7105 1100 011
220-240V~
P = 19bar
Ser.Nr.54213 S300075
1260W 50/60Hz
XN200610/1M0-4205
MADE IN SWITZERLAND
0042829
TYPE XN2006
05290054 7005 6100 019
220-240V~

6
Main Components
Service Manual EF 470 / EF 471 enVersion 1.1
Water circuit
1) Water tank
2) Water tank valve and connector
3) Pump
4) Thermoblock
5) Compact brewing unit (CBU)
6) Coffee outlet
5
6
43
2
1

7
Main Components
Service Manual EF 470 / EF 471 enVersion 1.1
Technical data Mains
EUR 230V / 50 Hz
USA /CAN 120 V / 60 Hz
JAP 100 V / 50-60 Hz
Approvals SEV, CENELEC, CE-conform,
UL, CUL, MITI
Cable length ~1,5 m
Pump data
Pump pressure
- max. permissible 17,5 bar ±1,5 bar
- during coffee preparation 9 -13 bar
(depending on brand of coffee)
Flow performance 120-240 ml/min. at 12 bar
Capacities
Water tank 0.9 l
Drip tray approx. 100 ml
Capsule container 10 - 14 pcs.
Power consumption
(at all voltages and frequencies)
Thermoblock 1’200 W
Pump 60 W
Ratings
Preheating 8.5 Wh
1 small cup (55 ml) 6.5 Wh
1 large cup (110 ml) 10 Wh
Stand-by mode 9.5Wh
(machine on) (in 1 hour)
Stand-by mode 0.45Wh
(machine off) (in 1 hour)
Various data
Pre-heating time approx. 50 s
Safety temperature (thermal cut-off) 167° C
Coffee temperature at outlet 86° C ± 3° C
Weight of machine approx. 3 kg
(without water)
166 mm
255 mm
291 mm
166 mm
254 mm
291 mm
EF 470
EF 471

8
Service Manual EF 470 / EF 471 enVersion 1.1
Operation
Preparation
1. Fill tank with water.
2. Insert water tank in coffee machine.
3. Switch on machine by pressing the On/Off
button.
4. Position receptacle with a capacity of
min.100 ml under coffee outlet.
)Do not insert a capsule yet.
5. Wait until machine is ready (coffee button
is lighted).
6. Press coffee button to rinse coffee outlet.
7. Press coffee button again when
receptacle is filled.
1
2
5
3
4
67

9
Operation
Service Manual EF 470 / EF 471 enVersion 1.1
Fill water system
If the coffee machine cannot pump water
although there is water in the tank, the water
circuit may be empty.
Procedure to fill water system:
1. Perform steps 1 to 5 for preparation (see
page 8).
2. Open closing handle in vertical position.
3. Press coffee button.
4. Press and hold closing handle to rear end
position.
5. Observe capsule inlet for appearing
water.
6. Press down closing handle immediately
when first droplets are visible.
7. Press coffee button again to stop water
flow.
3
2
6
7
45

10
Operation
Service Manual EF 470 / EF 471 enVersion 1.1
Making coffee
1. Open closing handle.
2. Insert capsule.
3. Press down closing handle completely.
4. Position cup under coffee outlet.
5. Press coffee button.
6. Press button again to stop coffee flow
when cup is full.
7. Briefly open closing handle after coffee
preparation and eject capsule into capsule
container.
2
1
6
3
45
7

11
Operation
Service Manual EF 470 / EF 471 enVersion 1.1
Empty water system
After operation, residual water remains in the
water circuit.
This residual water can be removed
- before a longer period of non-use,
- for frost protection,
- before repair and following shipping.
1. Empty water tank.
2. Press and hold On/Off button.
3. Simultaneously press coffee button three
times.
4. Release On/Off button.
The coffee button starts blinking fast and
the pump begins to empty the water
system.
5. Open closing handle and hold it in opened
position.
6. After coffee button stops blinking, press
down closing handle completely.
7. Empty drip tray.
)After this procedure the machine is
blocked for approx. 10 minutes (till
thermoblock temperature < 100° C).
3
2
3 x
1
6
4
5
7

12
Operation
Service Manual EF 470 / EF 471 enVersion 1.1
Coffee machine status
After pressing the On/Off button, an automatic
self test is performed to check if
- the NTC is connected,
- the NTC is short circuited,
- the thermoblock reaches the standby
temperature within 2 minutes in brewing
mode.
A detected failure is indicated by the
backlighted coffee button as well as the
operating modes listed in the following table.
Operating mode Coffee button LED signal
Off off
Heat up (coffee) blinking slow
Ready on
System too hot blinking fast
Brew coffee / rinse blinking slow
Heat up (descaling) blinking fast
Descaling ready blinking fast
Pump on (while descaling) blinking fast
Emptying water system blinking fast
Failure blinking three times fast

13
Service Manual EF 470 / EF 471 enVersion 1.1
Troubleshooting
Checking the machine on receipt
The receipt check enables you to rapidly
locate faults on the machine and to initiate
appropriate repair action.
Follow the check procedure.
Repair any faults found and check if the
machine is operating perfectly.
Check procedure Symptoms Action / repair work Further action / repair work
1 Check appliance for visible
damage
1.1 Parts of housing broken or damaged YES - Replace parts if necessary
NO - Go to point 1.2
1.2 Mains cable damaged YES - Replace mains cable
NO - Plug machine to the mains and go to point 2.1
2 Check mechanical elements
2.1 Closing handle works correctly
YES - Go to point 2.2
NO - It is hard or impossible to close the closing handle
YES - Screw on closing handle screws at defined
torque and block them with Loctite 241 (see page
20) or replace CBU
NO - Replace the CBU
2.2 Is the capsule correctly ejected? YES - Go to point 2.3
NO - Replace CBU
2.3 Is the capsule cage seal damaged?
(feel with a finger if the seal is damaged)
YES - Replace CBU
NO - Go to point 3
3 Fill water tank 3.1 Water tank is leaking YES - Replace water tank
NO - Go to point 4
4 Press On/Off button to perform
automatic self test 4.1 Machine is not working (no function)
YES - a) Check if mains cable is functional YES - Go to point b)
NO - Replace it
YES - b) Check if On/Off button is functional YES - Go to point c)
NO - Replace it
YES - c) Check if pump is working (press coffee
button)
YES - Go to point f)
NO - Go to point d)
YES - d) Check if coffee button is functional YES - Go to point e)
NO - Replace it
YES - e) Check if pump's fine wire fuse (128°C) is
defective
YES - Replace it
NO - Replace pump
YES - f) Check if thermoblock’s fine wire fuse (167°C)
is defective
YES - Replace it together with electronic control
board and if necessary the thermoblock
NO - Go to point g)

14
Troubleshooting
Service Manual EF 470 / EF 471 enVersion 1.1
4 Press On/Off button to perform
automatic self test - continued
4.1 Machine is not working (no function)
- continued
YES - g) Check if electrical wires are functional YES - Replace electronic mainboard
NO - Replace defective(s) wire(s)
NO - Go to point 4.2
4.2 Backlighted coffee button blinks at irregular
intervals
YES - Check if thermoblock heating element is func-
tional
YES - Replace NTC
NO - Replace thermoblock
NO - Self test ok. Go to point 5
5 Check coffee temperature while
preparing a coffee (see page 29)
5.1 No coffee outlet
YES - a) Water circuit is empty YES - Fill water circuit (see page 9)
NO - Go to point b)
YES - b) Pyramid plate is clogged YES - Replace CBU
NO - Go to point c)
YES - c) Machine is blocked by scale YES - Descale machine (see page 24)
NO - Go to point 5.2
5.2 Temperature is too low (less than 83°C) YES - Descale the machine (see page 24)
NO - Go to point 5.3
5.3 Temperature is too high (more than 89°C) YES - Change NTC
NO - Go to point 6
6 Check for leaks and check flow
rate (see pages 26, 27 and 28)
6.1 Leakage at extraction system YES - Replace CBU
NO - Go to point 6.2
6.2 Leakage at tubes connection YES - Replace defective tube and seal
NO - Go to point 6.3
6.3 Flow rate out of range
YES - Machine is scaled YES - Descale machine (see page 24)
NO - Replace pump
NO - No trouble found during the check procedure. Contact Nespresso Technical Correspondant for
further details in order to take decision.
7 Descaling process (if needed) 7.1 Machine scaled YES - Descale machine (see page 24)
NO - Go to point 8
8 Final cleaning (see page 30)
End of check procedure
Check procedure Symptoms Action / repair work Further action / repair work

15
Service Manual EF 470 / EF 471 enVersion 1.1
Repair
General disassembly
Tool:
- Oval screwdriver
)Empty water system if necessary
(see page 11).
Unplug from the mains before
disassembling machine - appliance
must be isolated!
Procedure:
1. Remove water tank (33) and drip tray (8)
together with drip grid (7) and capsule
container (6).
2. Remove 2 screws (2) on the front side of
the machine.
3. Place machine on the repairing/service
holder device (see page 31).
4. Remove 6 screws (2) on the bottom of the
machine.
5. Swing out and remove both side panels
(5).
6. Remove lower chassis (22).
5
5
33
7 + 8 + 6
2
2
22
2
2

16
Repair
Service Manual EF 470 / EF 471 enVersion 1.1
Replacing thermoblock
Tools:
- Torx screwdrivers T10, T30
- Open-ended spanner 10 mm AF
- Torque wrench
Procedure:
1. Follow general disassembly (see page 15).
2. Remove 3 screws (2) and separate thermo-
block (40) with support (40) from chassis.
3. Remove screw M6 x 25 and separate
thermoblock from its support.
4. Remove screw (38) and separate fine wire
fuse (900) from thermoblock.
5. Remove electronic housing (28).
6. Unplug NTC connector from electronic
control board (28).
7. Remove NTC (43) from thermoblock.
8. Remove clips (13) and hose connectors
(16, 26) from thermoblock.
9. Remove ground wire and electrical
connections from thermoblock.
10. Replace thermoblock and nut M6.
11. Assemble in reverse sequence.
)Use a torque wrench (90 - 110 Ncm)
to tighten NTC temperature sensor
(43) with spring washer.
)Check that there is a clearance of
1-2 mm between thermoblock and
support after assemblage.
40
40
2
38
38
39
900 43
M6 x 25
28
13
26
16
M6

17
Repair
Service Manual EF 470 / EF 471 enVersion 1.1
Replacing NTC
Tools:
- Torx screwdriver T10
- Open-ended spanner 10 mm AF
- Torque wrench
Procedure:
1. Follow general disassembly (see page 15).
2. Remove electronic housing (28).
3. Unplug NTC connector from electronic
control board (28).
4. Remove defective NTC temperature
sensor (43) from thermoblock (40) and
replace it with new one.
5. Assemble in reverse sequence.
)Re-use spring washer and tighten
new NTC temperature sensor (43)
with torque wrench (90 - 110 Ncm).
43
28
40

18
Repair
Service Manual EF 470 / EF 471 enVersion 1.1
Replacing pump
Tools:
- Torx screwdriver T10
- Long-nose pliers
- Blade screwdriver, no. 7
Procedure:
1. Follow general disassembly (see page 15).
2. Remove clip (14), hose (18) and o-ring
(15).
3. Remove angled hose (9).
4. Release pump (17) first from rubber strap
(12) at the side of the angled hose.
5. Remove electrical connections from pump.
6. Release pump from second rubber strap
(12).
7. Replace defective pump (17).
8. Attach new pump (17) to one rubber strap
with corner connector (20) first.
9. Plug in electrical connections on pump.
)Check for correct wiring of pump.
10. Attach pump to second rubber strap.
11. Insert new seal (15), mount hose (18) and
clamp (14).
12. Mount angled hose (9). 14
15
9
18
12
17
20
N
T 128°C
L
9

19
Repair
Service Manual EF 470 / EF 471 enVersion 1.1
Replacing electronic control board
with button prints
Tools:
- Torx screwdriver T10
The service engineer must be
earthed using an earthing strap!
)Only touch button prints with
dedicated gloves to avoid oxydation.
Procedure:
1. Follow general disassembly (see page 15).
2. Detach prints of On/Off button (30) and
coffee button (29) from upper chassis (1).
3. Remove housing (28) from electronic
control board (28).
4. Unplug NTC connector and all wires from
electronic control board (28).
5. Remove 2 screws (23) and replace defect
electronic control board with button prints
(29, 30).
6. Assemble in reverse sequence.
)Check for correct wiring of electronic
control board (see pages 21, 22 or
23).
1
28
23
30
29

20
Repair
Service Manual EF 470 / EF 471 enVersion 1.1
Replacing compact brewing unit (CBU)
Tools:
- Torx screwdrivers T10, T20
- Blade screwdriver no. 4
- Oval screwdriver
- Long-nose pliers
- Torque wrench
Procedure:
1. Remove water tank (33) and drip tray (8)
together with drip grid (7) and capsule
container (6).
2. Place machine on the repairing/service
holder device (see page 31).
3. Remove 4 screws (2) on the bottom of the
machine.
4. Swing out and remove both side panels (5).
5. Remove 2 screws (36) and pull off closing
handle (37).
6. Remove 2 screws (23) at the front and 1
screw (23) at the back to detach cover (35).
7. Unlatch coffee outlet (3) from compact
brewing unit (34) with a blade screwdriver.
8. Remove 4 screws (23) and detach
compact brewing unit (34).
9. Remove clip (14) and hose (32) with o-ring
(15) from compact brewing unit (34).
10. Assemble new compact brewing unit
together with new coffee outlet (3) in
reverse sequence.
Replace o-ring (15).
)Tighten new (EFR nr. 39256) closing
handle screws (36) with a torque of
450 N/cm.
33
7+8+6
2
23
34
36
36
5
3
14+32
23
23
35
37
23
15