Nespresso my machine C50 User manual

SERVICE MANUAL
U - COFFEE MACHINES
U (C and D) C50 / D50
Version 1.2 en

U service manual Version 1.2 en
2
CONTENTS
1 General safety notes .........................................................................................5
2 Main components...............................................................................................6
2.1 Overview............................................................................................................ 6
2.2 Interior view........................................................................................................ 7
2.3 Fluid system....................................................................................................... 8
3 Technical data.....................................................................................................9
3.1 Rating plates...................................................................................................... 9
3.1.1 Examples of brand specific rating plates ..................................................9
3.1.2 Rating plate details (example) ................................................................10
3.2 Technical specifications.................................................................................... 11
3.2.1 Dimensions and weight & size................................................................13
4 Operation............................................................................................................14
4.1 General information.......................................................................................... 14
4.2 Status indication............................................................................................... 14
4.3 Machine modes................................................................................................ 17
4.4 Empty water system......................................................................................... 19
5 Maintenance ......................................................................................................20
5.1 Descaling ......................................................................................................... 20
5.1.1 Descaling procedure...............................................................................20
5.2 Cleaning procedure.......................................................................................... 22
6 Troubleshooting ...............................................................................................23
6.1 Check list.......................................................................................................... 23
7Repairs................................................................................................................25
7.1 Safety instructions............................................................................................ 25
7.2 Repair and mounting tips................................................................................. 25
7.3 Tools and accessories...................................................................................... 26
7.4 General disassembly........................................................................................ 27
7.4.1 Prepare coffee machine for disassembly................................................27
7.4.2 Remove cover.........................................................................................28
7.4.3 Remove front cover and drop stop..........................................................29
7.4.4 Remove slider chassis and slider unit.....................................................30
7.4.5 Remove pivot bottom, cable bracket, power cable.................................32
7.4.6 Remove electronic device.......................................................................33
7.4.7 Remove flowmeter (FM) PCB.................................................................34
7.4.8 Remove high pressure connector...........................................................35
7.4.9 Remove pump.........................................................................................35
7.4.10Remove brewing unit device and steam cover.......................................36
7.4.11Remove BU housing and gear wheels....................................................37
7.4.12Remove thermoblock and capsule cage.................................................39

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7.5 Wiring diagrams............................................................................................... 40
7.5.1 Wiring diagram 220 V - 240 V IEC .........................................................40
7.5.2 Wiring diagram 120 V UL (USA / Canada).............................................41
7.5.3 Wiring diagram 127 V IEC (Brazil)..........................................................42
7.5.4 Wiring diagram 127 V IEC (Mexico) .......................................................43
7.5.5 Wiring diagram 100 V IEC (Japan).........................................................44
7.5.6 Wiring diagram 110 V IEC (Taiwan)........................................................45
8 Function tests...................................................................................................46
8.1 Safety instructions ........................................................................................... 46
8.2 Required equipment ........................................................................................ 46
8.2.1 Overview.................................................................................................46
8.3 Measure coffee temperature............................................................................ 47
8.4 Tightness and leakage checks........................................................................ 48
8.4.1 Preparations ...........................................................................................48
8.4.2 Test run...................................................................................................49
8.5 Protective earth (PE) continuity test ................................................................ 50
8.5.1 What is the protective earth continuity test about?.................................50
8.5.2 General...................................................................................................50
8.5.3 Test sequence ........................................................................................51
8.5.4 What to do if the protective earth continuity test fails .............................52
8.6 Protective insulation test.................................................................................. 52
8.6.1 What is the protective insulation test about?..........................................52
8.6.2 General...................................................................................................52
8.6.3 Test sequence ........................................................................................53
8.6.4 What to do if the insulation test fails.......................................................54
9 Explosion drawings.........................................................................................55
9.1 C50 Explosion drawing.................................................................................... 55
9.2 D50 Explosion drawing.................................................................................... 56
10 Parts list .............................................................................................................57
10.1 Nespresso C50 and D50 ................................................................................. 57

U service manual Version 1.2 en
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PREFACE
The purpose of thisservice manualistoprovidetheservicepersonnel withallnecessary
information with regards to correct handling, maintenance and repair of the U coffee
machines C50 and D50.
This manual should be used by the technicians as a valuable aid to guarantee the
permanent readiness for use of the machines. In order to take full advantage of all the
functions, it is absolutely necessary to follow the instructions in this manual.
Only use original spare parts from your official supplier for maintenance and repair work.
Spare parts lists and exploded drawings are subject to change. To optain the last
version, please contact your official spare parts supplier.
Visit the Nespresso technical website periodically to check for upgrades, technical
modifications, counter measures etc. for these coffee machines:
https://business.nespresso.com
CONTENT UPDATES
Version 1.0
• First released service manual version, in English only.
Version 1.1
• Updated version including several corrections, in English only.
• Change machine name from Pulse to U
• Update of several drawings
• Modified operating procedures for the following machine modes:
- Brewing mode / programming mode
- Descaling mode
- Emptying mode
- Resetting mode
Version 1.2
• Function test added: Tightness and leakage checks
Please keep this
manual together with
the corresponding
service documentation.
This way you are assured
to have the necessary
information.
Access is restricted
and can be obtained
by asking your
Nespresso technical
contact person.

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GENERAL SAFETY NOTES
1 GENERAL SAFETY NOTES
Therepairofthesemachines can only beperformedbyNespressoapproved after-sales
centers and technicians, using suitagble tools and original spare parts and taking into
account the national safety regulations.
As an additional safety measure, the use of a residual current device (RCD), also called
a ground fault circuit interrupter (GFCI), in the repair centre is highly recommended.
Risk of fatal electrical shock and fire!
Mains voltage inside the coffee machine.
• Unplug appliance before cleaning.
• Never clean wet or immerse plug, cord or appliance in any fluid.
• Disconnect the mains plug before disassembly - the appliance must
be free of voltage.
This device does
not protect against
electrical shock due to
contact with both circuit
conductors.
Example illustrations
of typical devices.
Use a GFCI with a trip
levelof4-6mA(USA)
resp.aRCDwithatrip
levelof15-30mA(Europe).
A trip level above 30 mA
provides only very limited
protection against harm
from an electric shock.
1) RCD protected socket-outlet
2) Plug-in RCD unit 3) GFCI socket 4) Plug-in GFCI
Danger of burns!
Hot parts and water under pressure inside the coffee machine
(particularly in the thermoblock).
• Let coffee machine cool down before cleaning or disassembly.
1
2
RESET
TEST
RESET
TEST
3
4

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MAIN COMPONENTS
2 MAIN COMPONENTS
2.1 Overview
1) Capacitive touch area
2) Slider for capsule insertion slot
3) Used capsule container and drip tray
4) Removable cup support and drip grid
5) Coffee outlet
6) Swivel water tank arm
7) Water tank
8) Water tank lid
1 (Lungo, 110 ml)
1 (Espresso, 40 ml)
1 (Ristretto, 25 ml)
2
3
4
5
6
7
8

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MAIN COMPONENTS
2.2 Interior view
1) Low pressure connector for water tank
2) Flowmeter
3) Steam cover
4) Drop stop
5) Thermoblock
6) BU housing
7) High pressure connector
8) Motor
9) Pump
4
5
6
1
3
2
7
8
9

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MAIN COMPONENTS
2.3 Fluid system
1) Water tank
2) Flowmeter
3) Pump
4) High pressure connector
5) Thermoblock
6) Capsule cage
7) Coffee outlet
8) Drop stop
9) Capsule container
10) Drip tray
11) Cup support
3
5
4
1
2
6
7
8
9
11
10
BU
TB
1
3
2
5
7
9
10
11
4
6

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TECHNICAL DATA
3 TECHNICAL DATA
3.1 Rating plates
3.1.1 Examples of brand specific rating plates The rating plate can
be found at the bot-
tom of the coffee
machine.
This overview shows
examples of various
brands and is subject
to alterations.

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TECHNICAL DATA
3.1.2 Rating plate details (example)
Decoding the alphanumeric serial number
Example:
1) Brand name
2) Voltage and power rating
3) Place of manufacture
4) National approval sign of Russia
(GOST R)
5) Conformity with RoHS guidelines
(lead free solder, etc.)
6) Barcode
7) Serial number
8) Machine type
9) Article number of the rating plate
10) Special disposal icon
(do not dispose with ordinary waste)
11) Sign of conformity (CE)
1
2
3
6
7
8
9
10
4
511
X
12115 C50 j 0440 782 07 X
By decoding the date
of production and
machine type, the
coffee machine can be
identified exactly. Checksum
Color version
Type of mains plug
Mains voltage
Distributing partner
Incremental number per production day
Manufacturing plant
Manufacturer designation of the machine type (C50)
12115 ... Date of production
(12 = year 2012, 115 = 115th day of the year)
12115 C50 j 0440 782 07 X

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TECHNICAL DATA
3.2 Technical specifications
Mains voltage ranges
- Europe, RU, AU, CN, KR, SG, HK, ME, ZA, IL, BR, AR............. 220-240 V, 50/60 Hz
- USA, Canada......................................................................................120 V, 50/60 Hz
- BR, MX ...............................................................................................127 V, 50/60 Hz
- Japan................................................................................................. 100 V, 50/60 Hz
- Taiwan..................................................................................................... 110 V, 60 Hz
Power consumption
220-240 V mains voltage ..................................................................... approx. 1’260 W
100/110/120/127 V mains voltage......................................................... 1’160 - 1’370 W
Power consumption of coffee machine main components
(for all voltages and frequencies)
Thermoblock ..................................................................................................... 1’200 W
Pump......................................................................................................................60 W
Energy consumption (CECED / FEA 2009 method)
Energy efficiency class level..............................................................................A - 40%
Daily energy consumption.................................................................................... 76 Wh
Annual energy consumption .............................................................................. 28 kWh
Pump
Pump pressure
- Max. permissible....................................................................................20 bar ± 3 bar
- During coffee preparation (depending on the type of coffee)........................ 9 - 16 bar
Capacities
Water tank...................................................................................................approx. 0.8 l
Tray water capacity......................................................................................min. 100 ml
Capsule container.......................................................................... approx. 10 capsules
EuP ... Energy using
Products
See commission regula-
tion no. 1275/2008 of the
European Union.
Approvals CE, UL "for USA and Canada", PSE, Gost R, Ctick,
CCC, KTL, SPRING, SASO, SABS, ISI, IRAM, NOM
EuP standard The coffee machine is EuP 2013 compliant
Advised water tank
capacity to avoid
spilling.

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TECHNICAL DATA
Volume of prepared coffee
- factory settings
Small cup "Ristretto.....................................................................................25 ml (±7%)
Small cup "Espresso"..................................................................................40 ml (±7%)
Large cup "Lungo"..................................................................................... 110 ml (±7%)
- customer settings
Programmable setting range........................................................................ 20 - 200 ml
Environmental conditions
Operating temperature............................ + 5 °C up to + 45 °C (+ 41 °F up to + 113 °F)
Storage temperature...................................- 25 °C up to + 65 °C (- 13 °F up to 149 °F)
Altitude ............................................................................up to 2’500 m above sea level
Humidity ...................................................................................................no restrictions
Various data
Preheating time.......................................................................................approx. 25 sec
Automatic shut off time................................................................ after 9 min of non-use
Safety temperature (electronically controlled).......................................120 °C (248 °F)
Safety temperature (thermal cut-off) ..................................................... 167 °C (333 °F)
Coffee temperature at outlet............................................86 °C ± 3 °C (187 °F ± 5,4 °F)
Descaling temperature.................................................................setting 70 °C (158 °F)

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TECHNICAL DATA
3.2.1 Dimensions and weight & size
Dimensions (length x width x height) ............................................ 366 x 115 x 251 mm
Distance drip grid - coffee outlet: .............................................88 mm (Espresso mode)
Distance bottom coffee outlet: ............................................. 138 mm (Macchiato mode)
Power cable length .............................. min. 0.8 m (depending on national regulations)
Weight (without water) ................................................................................approx. 3 kg
Dimensions in [mm].
251
366 115
202
88
138

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OPERATION
4 OPERATION
4.1 General information
For an overview of operational controls see “Main components” on page 6.
For basic operation of the machine such as preparing a coffee and other related infor-
mation, refer to the user manual.
4.2 Status indication
According to the following table the status of the coffee machine is shown by
- 3 capacitive sensors on MMI PCB
Machine
status State events LED’s Lungo Espresso Ristretto
Off All elements off off off off
Error
electronic
All 3 LED’s blink together
2Hz, 3 times every 2 sec. blinking 2Hz, 3times every
2 sec.
blinking 2Hz,
3timesevery
2 sec.
blinking 2Hz,
3 times every
2 sec.
Stuck
capsule
All 3 LED’s blink
alternating in direction
front (1st Lungo 0.5 sec,
2nd Espresso 0.5 sec, 3rd
Ristretto 0.5 sec)
on 0.5 sec
off 1 sec off 0.5 sec
on 0.5 sec
off 0.5 sec
off 1 sec
on 0.5 sec
No water
All 3 LED’s blink
alternating in direction
back(1stRistretto 0.5sec,
2nd Espresso 0.5 sec, 3rd
Lungo 0.5 sec)
off 1 sec
on 0.5 sec
Heat up
Blinking 1Hz on most
frequently used cup size
of the last 10 coffees,
Espresso when machine
is new. Change to user
selection when other
capactitive area is touched
Blinking1Hz
or off Blinking1Hz or off Blinking 1Hz or off
Ready
Steady light on most
frequently used cup size,
Espresso when machine
is new; or on user
selection when a
capacitive area has been
touched. Switch to most
frequently used cup size
after each coffee
Steady or off Steady or off Steady or off
Brew
Ristretto Steady on Ristretto Off Off Steady

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OPERATION
Brew
Espresso Steady on Espresso Off Steady Off
Brew
Lungo Steady on Lungo Steady Off Off
4 sec.
after brew Steady on cup size that has been brewed Steady or off Steady or off Steady or off
Rinse All LED’s steady on Steady Steady Steady
Descal-
ing ready All LED’s blinking together 2Hz Blinking 2Hz Blinking 2Hz Blinking 2Hz
Descal-
ing pump
on
All LED’s blinking
together 2Hz Blinking2Hz Blinking 2Hz Blinking 2Hz
Descal-
ing pump
off
All LED’s blinking
together 2Hz Blinking 2Hz Blinking 2Hz Blinking 2Hz
Emptying
& T
>115°C
EspressoOn0.5sec(after
6 sec of pressing touch)
(confirmation) off On 0.5sec off
Emptying Lungo and Ristretto blink-
ing together 1Hz Blinking 1Hz Off Blinking 1Hz
Overheat All blinking together 1Hz Blinking 1Hz Blinking 1Hz Blinking 1Hz
Switch
Auto off
time after
30min
Espresso On 0.5sec Off On 0.5sec Off
Switch
Auto off
time after
9 min
Espresso On 3 x 0.5sec Off
On 0.5sec
Off 0.5sec
On 0.5sec
Off 0.5sec
On 0.5sec
Off
Factory
setting Ristretto On 0.5sec Off Off On 0.5sec
Switch to
power off Ristretto, Espresso and Lungo together On 0.5sec On 0.5sec On 0.5sec On 0.5sec
Machine
status State events LED’s Lungo Espresso Ristretto

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OPERATION
Program-
ming
Lungo
Ristretto & Espresso On
0.5sec (confirmation) Off On 0.5sec On 0.5sec
Program-
ming
Espresso
Ristretto & Lungo On
0.5sec (confirmation) On 0.5sec Off On 0.5sec
Program-
ming
Ristretto
Espresso & Lungo On
0.5sec (confirmation) On 0.5sec On 0.5sec Off
Machine
status State events LED’s Lungo Espresso Ristretto

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OPERATION
4.3 Machine modes
This table helps to understand the operating modes of the U coffee machines:
Machine mode Enter mode Actions Exit mode
1 Heat up mode Every time after switch-
ing on machine
Heats up thermoblock
to ready temperature
90 °C within 30 sec
without overshooting
target temperature
e.g. switching off
machine
2 Self test mode Every time after switch-
ing on machine
Tests:
• NTC short circuit
• NTC connected
• Checks if thermo-
block reaches ready
temperature within
2 min after switch on
e.g. switching off
machine
3 Ready mode
• Afterheat upand self
test mode was ok
• After brewing or
volume brewing
coffee
• After reset mode
• After leaving
descaling mode
Keeps thermoblock
temperature at 90 °C e.g. switching off machine
4a Brewing mode
4b Volume brewing
mode (program-
ming cup size)
Brewing mode:
• Press and release
any coffee button
Programming mode:
• Open the slider
• Press and hold any
coffee button for
more than 3 sec
• Press and release
any coffee button
when machine is in
brewing mode or
automatic exit given
by the flowmeter
• Release corre-
sponding coffee
button when
machine is in
programming mode
• Switch off machine
5 Descaling mode
• Switch on machine,
wait until ready
• Press and hold the 3
coffee buttons for at
least 3 sec
• Regulates tempera-
ture to 55 °C (after
pump was started)
• Stops and starts
pumpwith anycoffee
button, no volume
brewing in descaling
mode
• Press and hold the 3
coffee buttons for at
least 3 sec
Note:Whenmachineis
switched off during any
descaling mode, then it
goes to descaling
mode ready state after
next switch on

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OPERATION
6 Emptying mode
(evaporing)
1) Switch on machine
2) Remove the water
tank
3) Open the slider
4) Press and hold the
Ristretto and
Lungo controls
together for at
least 6 sec. The
other control
flashes for confir-
mation
5) Close the slider to
start the procedure
1) Starts pump
2) Stops pump after
10 sec
3) Heats up thermo-
block to 105 °C
(100% power)
4) Switches off ther-
moblock
5) Switches off
machine
6) Blocksmachinefor
10 min
Switch off machine
7 Resetting mode
• Switch on machine
• Press and hold the
Espresso and Lungo
controls together for
at least 4 sec. The
other control flashes
for confirmation
• Resets programmed
volumes to factory
settings (Ristretto
25ml, Espresso
40ml, Lungo 110ml)
• Reset also the auto-
matic off mode to
9 min + the most
frequently used cup
size to espresso.
Proceeds with self test
mode automatically
8 Auto switch off mode
(factorysettingof9 min
can be changed to
30 min)
Automatically after a
certain period of non-
use
• Switch off machine
after 9 min resp.
30 min if no coffee is
brewed or 9 min
resp. 30 min after
last brewed coffee
9 Failure mode
Automatically by fol-
lowing failures:
a) NTC short circuit
b) NTC not connected
c) Heat up too slow
Machine indicates fail-
ure with blinking coffee
buttons as long as the
failure is present
When failure is fixed
Machine mode Enter mode Actions Exit mode

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OPERATION
4.4 Empty water system
After every operation, some water (max. 25 ml) remains in the coffee machine. There-
fore the water system must be emptied
- if the coffee machine will not be used for a long time
- as antifreeze measure
- for repairs and shipment.
After this procedure,
the coffee machine
will not be ready for
approx. 10 min (until the
thermoblockcools to below
100 °C ).
1) Remove the water tank. Place a
container under the coffee outlet. 2) Open slider 3) Press and hold the Ristretto & Lungo
controls together for at least 6 sec.
The other control flash for confirma-
tion. Then close the slider to start pro-
cedure.
4) Machines turns to Off mode automati-
cally when empty.
2
1
1
2
3

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MAINTENANCE
5 MAINTENANCE
5.1 Descaling
5.1.1 Descaling procedure
Need to descale depending on water hardness:
soft: 0-17fH / 0-9dH = descale after 4’000 cups
medium: 18-35fH / 10-19 dH = descale 2’000 cups
hard: over 36fH / over 20dH = descale after 1’000 cups
Only use Nespresso descaler (5034) or Nespresso descaling kit
(3035/CBU-2) –never use vinegar!
Descaler can damage casing and surfaces.
Immediately clean drops of descaling solution.
Duration approxi-
mately 15 minutes
Observe the safety
instructions on the
descaler package.
Usea container with a
capacity of min. 1 l.
1) Empty the drip tray and the used
capsule container. 2) Fill the water tank with 1 unit of Nes- presso descaling liquid and add
0.5 L /17 oz of water.
0.5 l
3) Place a container (minimum volume:
0.6 L / 20 oz) under the coffee outlet. 4) Activatethemachinebyeitherpushing the slider or one of the cup selection
touches
5) Blinking light: heating up.
6) Steady light: ready 7) To enter the descaling mode, push all the 3 controls simultaneously for at
least 3sec. A short beep will confirm
this. The control area will start blinking.