Nespresso EF748, EF749 Schematic
en
Service Manual Coffee Machine
EF 748
EF 749
1
01.2004 DOG
Contents
Main Components ........................................................ 5
Overview ....................................................................................... 5
Jaw ................................................................................................ 6
Overview of rating plates .............................................................. 7
Water circuit .................................................................................. 8
Technical Data ............................................................................... 9
Operation .................................................................... 10
Preparation .................................................................................. 10
Making coffee ............................................................................... 11
Preparing hot water ..................................................................... 11
Frothing aids ............................................................................... 12
Heating with steam ..................................................................... 12
Frothing ....................................................................................... 12
LED status diagram .................................................................... 13
Troubleshooting ......................................................... 14
Checking the machine - receipt (1) ............................................ 14
Checking the machine - receipt (2) ............................................ 15
Coffee temperature too low ........................................................ 16
Coffee temperature too high ...................................................... 16
No function .................................................................................. 16
No outflow ................................................................................... 17
No steam function or too little steam ......................................... 18
No capsule ejection .................................................................... 18
Jaw does not close ..................................................................... 18
Water on the jaw ......................................................................... 18
Water on side of machine or below machine............................. 19
Pump noisy ................................................................................. 19
Not enough froth when frothing milk ......................................... 19
2
Contents
Repair .......................................................................... 20
General disassembly (stage 1) ................................................... 20
General disassembly (stage 2) ................................................... 21
Replacing thermoblock .............................................................. 22
Replacing NTC ............................................................................ 22
Replacing pump .......................................................................... 23
Replacing fine-wire fuse ............................................................. 24
Replacing control board ............................................................. 25
Replacing main switch or steam switch .................................... 26
Replacing LED ............................................................................ 26
Replacing steam pipe ................................................................. 26
Replacing jaw .............................................................................. 27
Complete jaw disassembly ......................................................... 28
Complete jaw disassembly ......................................................... 29
Replacing heating PTC ............................................................... 30
Replacing pyramid plate ............................................................. 31
Replacing capsule cage ............................................................. 31
Electronic mainboard, wiring diagram ....................................... 32
Maintenance................................................................ 33
Descaling .................................................................................... 33
Measuring rate of flow ................................................................ 35
Checking for leaks and pump pressure (1) ................................ 36
Checking for leaks and pump pressure (2) ................................ 37
Checking extraction chamber for leaks ..................................... 38
Measuring coffee temperature ................................................... 39
Measuring closing force ............................................................. 40
Checking reed contact ................................................................ 41
Daily maintenance and final cleaning ........................................ 42
Spare parts ................................................................. 43
3
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 machine
EF 748 and EF 749.
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. At the Internet address www.adobe.com you can obtain the utility Adobe
Acrobat for additional platforms, free of charge.
4
Main Components
Overview
1 Switch On/ Off
2 Switch steam
3 Upper part Jaw
4 Lower part Jaw
5 LED
6 Electronic mainboard
7 Steam pipe
8 Frothing aid
9 Floater
10 Drip tray
11 Drip grid
12 Closing handle
13 Jaw stick coffee / hot water
14 Water tank
15 Water tank connector
16 Condensation room
17 Thermoblock
18 Pump
19 Container for used capsules
12
1
3
4
5
7
6
13
14
16
15
11
10
8
9
19
17
18
2
5
Main Components
Jaw
20 Support for brewing unit
21 Capsule cage
22 Closing handle
23 Jaw stick coffee, hot water/ steam
24 Blades
25 Cover
26 Heating PTC (until Sept. 2003 only)
27 Coffee capsule
28 Ejector
29 Pyramid plate (PPP, plastic)
30 Pyramid plate support
31 Brewing unit with ceramic valve and
reed contact board
32 Capsule cage connection
21
27
26
3225
22 2324
28
29
30
20
31
6
Main Components
Overview of rating plates
Depending on the brand, the rating plate may
be of varying design.
The rating plates carry the following
information:
Turmix
Date code
DDMMY
Krups
FNA141 = type
1M = factory
0 = internal number
08081 = Date code
DDMMY
König
03170 = Item number
with colour code
Date code DDMMY
Magimix
M200 = type code
Item number with colour
and country coding
Date code DDMMYY
Jura
636 = type
A = colour code
1 = Appliance
modification status
7
Saeco
Date code WWYY
Main Components
Water circuit
1 Water tank
2 Water tank valve
3 Pump
4 Thermoblock
5 Ceramic valve
6 Coffee outlet
7 Steam pipe and frothing aid
8 Condensation room
9 Drip tray
5
1
8
6
2
7
3
9
4
8
Main Components
Technical Data
Dimensions in mm
Mains EUR: 230V / 50 Hz
USA /CAN:120 V / 60 Hz
JAP: 110 V / 50-60 Hz
Cable length ~1,5 m
Approvals SEV, CENELEC, - conform
UL, CUL, MITI
Pump pressure:
- max. permissible 17,5 bar ±1,5 bar
- during coffee preparation 9 - 13 bar
(depending on brand of coffee)
Flow performance
100 - 240 ml/min. at 12 bar
Weight of machine 4,8 kg
(without water)
Capacities
Water tank 1.2 l
Drip tray 0.45 l
Capsule container 10-12 pcs.
Pre-heating time approx. ca. 45 s
Safety temperature (thermal cut-off) 184° C
Power consumption
(at all voltages and frequencies):
Heating 1’200 W
Pump 60 W
Heating PTC 15 W
Ratings:
Preheating 15.5 Wh
1 small cup (45ml) 5.5 Wh
1 large cup (110ml) 9 Wh
Stand-by mode (24 hours) 575 Wh
9
Operation
Preparation
1 Switch on machine
2 Position pot underneath
3 LED flashes green
4 Fill with water
5 Flush JAW
1
2
3
4
10
5
Operation
Making coffee
1 Open jaw
2 Insert capsule
3 Close jaw
4 Position cup
5 LED must be green
6 Place jaw stick in the front position,
coffee flows into the cup
7 Once the cup contains the required
amount, return the jaw stick to the
middle position
8 Briefly open jaw and eject capsule into
the capsule container
1
3
2
4
5
67
Preparing hot water
1 Position cup underneath steam pipe
2 LED illuminates green
3 Place jaw stick in the rear position, hot
water flows into the cup
4 Once the cup contains the required
amount, return the jaw stick to the
middle position
4
3
1
2
11
Operation
Heating with steam
1 Slide down frothing pipe (only frothing
aid A and B)
2 Press steam switch
3 LED flashes orange, wait until LED
illuminates orange
4 Immerse frothing pipe approx. 1cm
deep in the liquid
5 Place jaw stick in the rear position until
the required temperature is reached
6 Return jaw stick to the middle position
Frothing
6
5
1
4
3
1 Slide down frothing pipe (only frothing
aid A and B)
2 Press steam switch
3 LED flashes orange, wait until LED
illuminates orange
4 Immerse frothing pipe approx. 1cm
deep in the milk
5 Place jaw stick in the rear position until
the required foam is produced
6 Return jaw stick to the middle position
Frothing aids
There are three different types of frothing aid.
A) EF 749
B) EF 748 Turmix and Nespresso
C) EF 748 Krups
A
12
2
B
C
Operation
LED status diagram
The LED status diagram shows the
behaviour of the LED depending on
temperature and function.
LED-status
1 LED flashes green slowly
LED illuminates green
2
3 LED flashes orange slowly
4 LED illuminates orange
5 LED flashes green quickly
Operating sequence
A
Switch on main switch
B
Jaw stick forward or back
C
Jaw stick in middle
D
Operate steam switch
Jaw stick back
E
Jaw stick in middle
F
Note
After the preparation of coffee or hot
!
water, the green LED may flash
rapidly for a short time due to overtemperature.
Steam
preparation
Coffee and
hot water
preparation
Heating up
Ready
Coffee / hot water
preparation
Heating up
Ready
Heating up
Steam ready
Steam preparation
Cooling
!
3
A
1
2
CB E F
2
1
D
23
44
5
13
Troubleshooting
Checking the machine - receipt (1)
The receipt check enables you to rapidly
locate faults on the machine and to initiate
appropriate repair action.
Keep to the order given in the table.
Repair any faults found and repeat the
repair routine to the end.
• Check appliance for visible damage
• Check mechanical elements
• Switch on
• Fill water tank
• Coffee preparation without capsule
- Parts of housing broken or damaged?
- Mains cable damaged?
- Has the customer opened the machine?
- Does the jaw stick engage?
- Does the closing handle work?
- Is the ejector mechanism in working order?
- LED flashes during heating up
- How long does the machine need for
heating up (typical time approx. 45s)?
- Water tank leaks?
- Does the reed contact work?
- Does the pump work?
- Does hot water escape?
• Hot water preparation
14
- Does the reed contact work?
- Does hot water escape?
Troubleshooting
Checking the machine - receipt (2)
• Steam preparation
• De-scale
• Flow rate
• Check for leaks
• Temperature measurement
• Clean
- Does the steam switch work correctly?
LED must flash orange slowly during
heating up and then illuminate continuously.
- Does steam escape?
- See page 33
- See page 34
- See page 35 to 37
- See page 38
- See page 41
• Measure closing force
• Check reed contact
15
- See page 39
- See page 40
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