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Nespresso Gran Maestria EF 287, Service Manual

Discover the Nespresso Gran Maestria EF 287 and unlock the full potential of this exceptional coffee machine with our free Service Manual. Download the comprehensive manual from manualshive.com to learn more about its features, brewing techniques, and maintenance tips. Elevate your coffee experience to new heights with this user-friendly guide.

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Maestria / Gran Maestria service manual

93

W I R I N G   D I A G R A M S

Wiring diagram Maestria 220 - 240 V, 50 - 60 Hz (IEC) - part 2

220-240V

GND

+5V

Flowmeter

Signal

1

1

THERMAL

F

USE

L(

L

in

e

)

N(

N

e

u

tr

a

l)

EF285

/

E

F287

Mainboard

Microprocessor

Logic

PLUG

AC

MALE

L

N

PE

1

1

THERMAL

F

USE

NTC1

NTC1

Common

MMI-OOS-Board

1

1

4.8*0.8

4

.8*0.8

HEATER

2

PE

Switching

power

supply

+5V

GND

L

N

1

6.3*0.8

X6

1

6.3*0.8

X8

6.3*0.8

1

X7

1

4.8*0.8

X15

L(F)

Ph_Heat1

Ph_Pump12

Pump

1

Ph_Heat2

Fu

se0

.5AT

Tra

ckFu

se

Heat1

Heat2

1

6.3*0.8

X9

6.3*0.8

1

X10

6.3*0.8

1

X11

X13

1

4.8*0.8

X12

1

4.8*0.8

Pump

2

X18

1

4.8*0.8

X19

1

4.8*0.8

X1

1

4.8*0.8

Aerocino

shut

d

own

Pump2_SwitchA

N(F)

1

6.3*0.8

1

6.3*0.8

L

N

shut

down

1

1

4.8*0.8

4

.8*0.8

HEATER

1

PE

V1

C1

1

1

THERMAL

F

USE

1

1

THERMAL

F

USE

1

2

3

4

5

6

JST

6

-pol

XH-Connector

X16

+5V

Poti2

SW2

LED2

LED4

GND

1

2

3

4

5

6

JST

6

-pol

XH-Connector

X22

+5V

SW3/Pot3

SW4

GND

LED5

LED6

NTC2

Common

NTC2

1

2

3

4

5

6

SW1

GND

Poti1

JST

6

-pol

XH-Connector

+5V

LED1

LED3

X14

1

2

JST

2-pol

XH-Connector

X27

X26

JST

2-pol

XH-Connector

1

2

1

2

3

4

JST

4

-pol

XH-Connector

RxD

TxD

+5V

GND

X3

1

2

3

JST

3-pol

XH-Connector

X25

PE

Coffee,

T

B2010

Steam,

TB2011

1

4.8*0.8

X17

X20

1

4.8*0.8

4.8*0.8

AC

1

1

4.8*0.8

PUMP

2

Steam

THERMAL

F

USE

PUMP

1

6.3*0.8

AC

1

1

6.3*0.8

Coffee

Aeroccino

0069151

Legend:

Mains without Phase and Neutral

>0

.2

A

Neutral

<1

5

W

<=

0.2A

Earth, PE

Phase

SELV

Safe-to-touch (electrically isolated 

or protective impedance)

Summary of Contents for Gran Maestria EF 287

Page 1: ...S E R V I C E M A N U A L M A E S T R I A G R A N M A E S T R I A C O F F E E M A C H I N E S Maestria EF 285 Gran Maestria EF 287 Version 0 1 en ...

Page 2: ...ia 19 3 3 2 Water circuit diagram Gran Maestria 20 4 Technical Data 21 4 1 Rating plates 21 4 1 1 Nespresso specific rating plates 21 4 1 2 Rating plate details 21 4 1 3 Rating plate of milk frother 22 4 2 Summary of technical data 23 4 2 1 Technical data of coffee machines 23 4 2 2 Technical data of milk frother 24 4 2 3 Dimensions and weight Maestria 25 4 2 4 Dimensions and weight Gran Maestria ...

Page 3: ... 5 Repair instructions Gran Maestria 73 7 5 1 General disassembly Gran Maestria 73 7 5 2 Replacing milk frother connector 80 7 5 3 Replacing cup heater 81 7 5 4 Replacing electronic mainboard Gran Maestria 82 7 5 5 Replacing milk regulator assembly 83 7 5 6 Reassembly and wiring instructions Gran Maestria 83 8 Wiring diagrams 91 8 1 Wiring diagram versions 91 8 2 Wiring diagrams Maestria EF 285 92...

Page 4: ...st for steam pipe Maestria 128 9 9 Protective earth PE continuity test 130 9 9 1 What coffee machine has to be tested and when 130 9 9 2 General 130 9 9 3 Test sequence 131 9 9 4 What to do if the protective earth continuity test fails 133 9 10 Protective insulation test 134 9 10 1 What coffee machines have to be tested and when 134 9 10 2 General 134 9 10 3 Test sequence 135 9 10 4 What to do if ...

Page 5: ... absolutely necessary to follow the instructions in this manual Spare parts lists and exploded drawings are subject to change To obtain 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 C O N T E N T U P D A T ...

Page 6: ...ains plug before disassembly the appliance must be free of voltage This device does not protect against electrical shock due to contact with both cir cuit conductors Example illustrations of typical devices Use a GFCI with a trip level of 4 6 mA USA resp a RCD with a trip level of 15 30 mA Europe A trip level above 30 mA provides only very limited protection against harm from an electric shock 1 R...

Page 7: ...ed with a cup heater and a detachable milk frother Out of three possible functions coffee preparation cup heating and milk frothing two func tions can be carried out simultaneously Front view right and left side Simultaneous heat up of both thermoblocks is only possible with 220 240 V versions Front view right and left side Simultaneous heat up of both thermoblocks is only possible with 220 240 V ...

Page 8: ...p support 3 is tilted up is locked in place by a permanent magnet in the coffee machine and a small metal plate at the rear side of the drip tray 6 The tray cover 7 can be removed for cleaning 1 Water tank 2 Steam pipe pivotable with steam nozzle and frothing sleeve 3 Cup support pivotable 4 Drip grid 5 Drip tray 6 Metal plate for magnetic contact 7 Tray cover 8 Capsule container for used capsules...

Page 9: ...ng 9 min For setting the auto shut time see Special settings on page 28 The lever 2 opens and closes the brewing unit and gives access to the feed opening for the coffee capsule For all possible settings of the steam handle 6 and push turn controls 4 5 see Machine settings on page 27 1 On Off button 2 Lever 3 Indication lights 3x 4 Push turn control Lungo 5 Push turn control Espresso 6 Steam handl...

Page 10: ...team position to ready mode position the remaining steam is led into the relief tank 7 From there the condensed water drips into the drip tray Left side view front side Top cover side pan els and bottom part removed 1 Micro switches 2x 2 Steam valve 3 Brewing unit TCBU 4 Relief tank for steam 5 Thermoblock types 2010 coffee and 2011 steam arranged behind one another 6 NTC temperature sensor 7 Outl...

Page 11: ...11 M A I N C O M P O N E N T S 3 1 4 Interior view 2 Maestria Right side view rear side Top cover side pan els and bottom part removed 1 Pump for coffee preparation 2 Pump for steam preparation 3 Flow meter 4 ON OFF switch assembly 1 2 3 4 ...

Page 12: ...tria service manual 12 M A I N C O M P O N E N T S 3 1 5 Interior view 3 Maestria View from below Bot tom cover removed 1 Terminal block power cord connection 2 Water tank connector 3 Electronic main board assembly 1 2 3 ...

Page 13: ...cked in place by a permanent magnet in the coffee machine and a small metal plate at the rear side of the drip tray 4 The tray cover 12 can be removed for cleaning The drip tray 11 has a floater 13 that signals a high waste water level 1 Drip grid 2 Cup support pivotable 3 Cup heater 4 Metal plate for magnetic contact 5 Coffee outlet 6 Water tank 7 Milk frother 8 Power cord 9 Maintenance unit cpl ...

Page 14: ...d has no control or display elements itself The power socket 6 connects the milk frother to the mains voltage input of the coffee machine includes emitters and receivers for light signal transmission The whisk 7 contains two magnets and is driven by a magnetic coupling The milk frother is part of the Gran Maestria coffee machine 1 Lid 2 Seal 3 Indication of max milk and foam level 4 Jug 5 Spout 6 ...

Page 15: ...it and gives access to the feed opening for the coffee capsule For possible settings of the push turn controls 4 5 6 see Machine settings on page 27 The cup heater is activated by pressing down its three rips 4 with the rim of a cup 1 Rips 3x on cup heater 2 Push turn control Espresso 3 Indication lights 3x 4 Push turn control Lungo 5 Lever 6 Indication light for milk frother 7 Push turn control m...

Page 16: ...E N T S 3 2 4 Interior view 1 Gran Maestria Left side view Side panels removed 1 Thermoblock types 2010 coffee and 2011 cup heating arranged behind one another 2 NTC temperature sensor 3 Pivoting mechanism for cup support 4 Snap lock for capsule container 1 2 3 4 ...

Page 17: ...a service manual 17 M A I N C O M P O N E N T S 3 2 5 Interior view 2 Gran Maestria Right side view Side panels removed 1 Pump for coffee preparation 2 Pump for cup heating and flow meter not visible 3 Milk regulator 1 3 2 ...

Page 18: ... M P O N E N T S 3 2 6 Interior view 3 Gran Maestria View from below Bot tom cover removed 1 Terminal block power cord connection 2 Water tank connector 3 Electronic main board assembly 4 Micro switches 3x of cup heater 5 Milk frother connector 1 2 3 4 5 ...

Page 19: ...m Maestria 1 Flow meter 2 Pump 3 Thermoblock 2010 4 Water tank 5 Water tank valve 6 Water tank connector 7 Filter 8 Pump 9 Thermoblock 2011 10 Vent valve optional 11 Drip tray 12 Vent valve 13 Steam pipe 14 Steam valve 15 Brewing unit TCBU with check valve 4 5 6 7 2 9 3 15 13 12 14 1 8 10 11 TB 2010 TB 2011 TCBU ...

Page 20: ...diagram Gran Maestria 1 Flow meter 2 Pump 3 Thermoblock 2010 4 Water tank 5 Water tank valve 6 Water tank connector 7 Filter 8 Pump 9 Thermoblock 2011 10 Outlet valve optional 11 Cup warmer 12 Drip tray 13 Brewing unit TCBU with check valve 2 1 11 13 4 5 6 7 9 3 8 TB 2010 TB 2011 10 12 TCBU ...

Page 21: ...fee machine Maestria EF 285 Gran Maestria EF 287 1 Brand name 2 Voltage and power rating 3 Place of manufacture 4 National approval sign of Russia GOST R 5 National approval sign of Germany VDE 6 Barcode 7 Serial number 8 Machine type 9 Sign of conformity CE 10 Special disposal icon do not dispose with ordinary waste 11 Russian protection class conformity 12 Conformity with RoHS guidelines lead fr...

Page 22: ...g Mains voltage Distributing partner Incremental number per production day Manufacturing plant Manufacturer designation of the machine type EF 287 12019 Date of production 12 year 2012 019 19th day of the year 120 192 871 0007 782 1JG The milk frother is part of the Gran Maestria coffee machine Risk of damage The milk frother can be destroyed if connected to a wrong mains voltage Check the mains v...

Page 23: ...A 40 Daily energy consumption Maestria 81 Wh Daily energy consumption Gran Maestria 79 Wh Annual energy consumption Maestria Gran Maestria 29 kWh Capacities Water tank approx 1 4 l Drip tray 250 ml Capsule container 10 14 capsules Milk frother Gran Maestria 240 ml hot milk 120 ml foam Temperatures Operating temperature 5 C up to 45 C Storage temperature 25 C up to 60 C Safety temperature thermal c...

Page 24: ... mains voltage ranges has to match the mains voltage range of the associated coffee machine Power consumption Version 92948 410 490 W Version 92947 120 V 450 W Version 92947 127 V 505 W Capacity Hot milk max 240 ml Hot cold milk for milk froth max 120 ml Performance data Preparation times with full semi skimmed or skimmed milk at 6 8 C fridge temperature Cold milk froth 120 ml 60 90 sec Hot velvet...

Page 25: ...ht Maestria Dimensions A x B x C 385 x 302 x 170 mm Power cord length approx 1 m Weight without water approx 5 3 kg 4 2 4 Dimensions and weight Gran Maestria Dimensions A x B x C 385 x 302 x 320 mm Power cord length approx 1 m Weight without water milk frother included approx 7 kg A B C C B A ...

Page 26: ... 26 T E C H N I C A L D A T A 4 2 5 Dimensions and weight milk frother Jug diameter D max 95 mm Jug height H approx 170 mm jug without lid 165 mm Dimensions of whisk diameter x height 33 x 32 mm Weight with spring whisk approx 0 75 kg D H ...

Page 27: ... push turn controls at the front side of the coffee machine set the volume of water used for coffee preparation or rinsing according to the following table 5 2 2 Steam handle setting Maestria The handle at the left side of the Maestria coffee machine determines the operation of the steam pipe according to the following table Dial setting Espresso Lungo 1 25 ml 70 ml 2 30 ml 90 ml 3 40 ml 110 ml 4 ...

Page 28: ... table 4 Press Lungo button to confirm setting or start procedure 5 Press Espresso button for 5 seconds to exit menu mode any time Dial setting Operating mode 1 cold milk froth preparation velvety soft consistency 2 warm milk froth preparation velvety soft consistency 3 warm milk froth preparation dense consistency 4 warm milk preparation only Espresso push turn control Lungo push turn control Dia...

Page 29: ... off LED status not defined i e not important to show a certain machine status Left right LED on Left right LED blinking with 1 Hz 0 5 s on 0 5 s off Left right LED blinking with 2 Hz 0 25 s on 0 25 s off Middle LED on white Middle LED blinking white with 1 Hz 0 5 s on 0 5 s off Middle LED blinking white with 2 Hz 0 25 s on 0 25 s off Middle LED on orange Middle LED blinking orange with 1 Hz 0 5 s...

Page 30: ...p coffee Left right LEDs blinking with 1 Hz 0 5 s on 0 5 s off Heating up steam cup heater Middle LED blinking white with 1 Hz 0 5 s on 0 5 s off Ready for coffee preparation Left right LEDs on Ready for steam preparation cup heating Middle LED on white Brewing or rinsing small cup Left LED blinking with 1 Hz 0 5 s on 0 5 s off Right LED on Brewing or rinsing big cup Right LED blinking with 1 Hz 0...

Page 31: ...p heater Middle LED blinking white with 1 Hz 0 5 s on 0 5 s off same as heat up Machine status etc Left LED Middle LED Right LED LED signal Maestria and Gran Maestria have differ ent descaling pro grams and light signals Descaling status Left LED Middle LED Right LED LED signal Descaling mode Middle LED on orange Left right LEDs off Descaling water and steam circuit Middle LED blinking orange with...

Page 32: ...uit for coffee Middle LED on white Right LED blinking with 1 Hz 0 5 s on 0 5 s off Water circuit descaled Left LED blinking with 1 Hz 0 5 s on 0 5 s off Middle and right LEDs on white and green Rinsing cup heater Left and middle LEDs blinking green with 1 Hz 0 5 s on 0 5 s off Cup heater rinsed Left LED blinking with 1 Hz 0 5 s on 0 5 s off Middle and right LEDs on white and green Rinse water circ...

Page 33: ...e possible warm milk preparations selected with push turn control pos 2 3 or 4 Red Ready Milk frother connected to socket Cold milk froth preparation selected with push turn control pos 1 Blue Operating Milk frother running One out of three possible warm milk preparations selected with push turn control pos 2 3 or 4 Red blinking with 1 Hz 0 5 s on 0 5 s off Operating Milk frother running Cold milk...

Page 34: ...ort cannot be tilted up does not engage or rat tles YES check cup support and mounting NO continue Replace damaged parts 2 4 Steam handle rotates unengaged or jams YES check steam handle mounting screw clip etc NO continue Replace damaged parts 2 5 Lever cannot be operated correctly YES check brewing unit check lever brake on brewing unit check if rubber buffer is missing NO continue Replace damag...

Page 35: ...ntinue Replace damaged parts 6 Test function of pumps 6 1 Steam handle is in steam position No steam flows out of steam pipe 6 1 1 Pump does not start YES check micro switches on steam valve check pump steam circuit check electronics NO continue 6 1 2 Pump starts YES check water tank water tank valve and connector check tubing for leaks or clogging check steam pipe check pump steam circuit check i...

Page 36: ...ules check electronics NO continue Clean or replace flow meter Replace damaged parts 7 8 Coffee capsule not ejected YES check brewing unit NO continue 8 Test automatic shut off see Spe cial settings on page 28 8 1 Middle LED does not light up orange YES check push turn control modules check wiring check electronics NO continue Replace damaged parts 8 2 Coffee machine does not switch off YES check ...

Page 37: ... does not engage or rat tles YES check cup support and mounting NO continue Replace damaged parts 2 4 Lever cannot be operated correctly YES check brewing unit check lever brake on brewing unit check if rubber buffer is missing NO continue Replace damaged or missing parts 2 5 Lever makes unu sual noises YES check brewing unit NO continue Replace damaged parts 3 Fill water tank 3 1 Water tank leaks...

Page 38: ...ee does not start YES check thermal cut out limitor on pump check Lungo push turn control module check wiring check electronics NO continue 5 2 2 Pump for coffee starts YES check tubing for leaks or clogging check pump check flow meter check if thermoblock for coffee is calcified check brewing unit and its check valve Continue 6 Test coffee prepa ration set dials of Espresso and Lungo push turn co...

Page 39: ...range YES check milk frother NO continue 7 5 Milk frother does not switch off YES check milk frother NO continue 8 Test automatic shut off see Spe cial settings on page 28 8 1 Middle LED does not light up orange YES check push turn control modules check wiring check electronics NO continue Replace damaged parts 8 2 Coffee machine does not switch off YES check push turn control modules check electr...

Page 40: ...nap connections Some covers and components of the coffee machine are connected screwless with latches When loosening these latches proceed with care and patience to avoid causing any damage Screw connections Do not overtighten screws Plastic threads and inserts are delicate Metal housing parts are fastened with self tapping screws Replacement housing parts are unthreaded Risk of fatal electrical s...

Page 41: ...and clips Residual water If it is necessary to pull off hoses from components hold ready a small beaker and a towel to collect and wipe away leaking water The coffee machine must be emptied of residual water for repair or shipment refer to Special settings on page 28 Protection against scratches During general disassembly lay all metallic housing parts on a soft cloth to avoid damaging their surfa...

Page 42: ... cool down Take away water tank 801 Pull out cup support 183 by hand Remove maintenance unit capsule container 179 drip tray 814 drip tray cover 182 and drip grid 178 Pull out shaft 171 by hand Place the coffee machine on a dismantling surface that will not damage or scratch the metallic housing of the machine A bit holder with appropriate bits can also be used as screwdriver TORX screwdrivers TX ...

Page 43: ...a service manual 43 R E P A I R S Only if necessary Turn cable holder 168 to the side Remove power cord from strain relief and cable storage fixation Loosen 6 screws TX 20 and remove base cover 167 from base 160 167 168 160 ...

Page 44: ... Loosen fixing screw and remove steam handle 824 Position a small permanent magnet as mounting aid at the base 160 to fix its coun terpart 161 824 161 160 A small permanent magnet 161 loosely inserted in the base acts as magnetic mounting for the drip tray ...

Page 45: ...osen 4 upper fixing screws TX 20 of side panels Pull base a little bit away from machine to release the side panels Lift up and incline the side panels to remove them Coffee machine is shown upside down for better visibility of fixing screws 170 169 160 Take care not to stress wiring and hoses between base and upper part ...

Page 46: ... of housing 132 Open lever 130 vertically Lift upper part of housing 132 a little bit at the front side and pivote the housing from the back to the front following the lever Unplug connectors from the push turn controls 802 803 of the coffee buttons Remove upper part of housing 132 130 803 802 132 ...

Page 47: ...eplacing water tank connector Pull off both hoses from water tank connector 808 Loosen 2 screws TX 10 and remove water tank connector The water tank con nector 808 is replaced together with gasket and sieve insert a Hose to flow meter b Hose to steam pump 808 a b ...

Page 48: ...5 is designed for different cable diameters Check that the strain relief clamp is correctly mounted correct side up or down see detail in illustration and following table by pulling on the cable It must not be possible to pull out the cable Check that all terminal screws are retightened Mounting position of strain relief clamp Permissible diameter of power cord Grooves down on power cord XX XX mm ...

Page 49: ... wiring 2 NTC 1 temperature sensor connector red coffee thermoblock 3 NTC 2 temperature sensor connector white steam thermoblock 4 Flow meter connector white 5 Lungo push turn control red 6 Steam valve connector 3 colours 7 Espresso push turn control white X11 Heat 2 steam thermoblock gray X10 Heat 1 coffee thermoblock white X9 N On Off button light blue X1 no wiring X19 Pump 2 steam pump gray X18...

Page 50: ...electronic main board Remove all wires from cable guides on electronic main board assembly 806 Loosen 4 fixing screws TX 10 and remove electronic main board assembly Assembly checkpoints Insert all wires with flat receptacles in cable guides Check correct position of connectors and flat receptacles on electronic mainboard see page 49 806 125 ...

Page 51: ...Maestria Gran Maestria service manual 51 R E P A I R S 7 4 5 Replacing changeover outlet valve Pull both clips 58 from fluid connections and remove outlet valve 61 61 58 ...

Page 52: ...R E P A I R S Assembly checkpoint Observe correct mounting position of outlet valve 61 according to illustration 61 62 820 203 Also note the arrows on top of the outlet valve case 61 arrow in from thermoblock arrow out towards relieve tank 820 ...

Page 53: ...s and remove both pressure hoses Loosen screw TX 10 and remove steam valve clip 82 Loosen 2 screws TX 10 and remove steam valve 821 Assembly tip To prevent cabling errors Lay defect steam valve beside new one Carefully unplug flat receptacles from micro switches and immediately connect them to new steam valve 82 821 ...

Page 54: ...ase 2 latches with screwdriver and remove cover with steam thermoblock 810 Remove electrical connections and hoses from defect steam thermoblock or replace NTC temperature sensor 47 To replace coffee thermoblock 809 Remove electrical connections and hoses from defect coffee thermoblock Loosen 2 screws TX 10 and remove coffee thermoblock with bottom cover 809 Now the NTC temperature sensor 29 can b...

Page 55: ...rature is exceeded they interrupt the electric circuit permanently Like a blown fuse they need to be replaced together with the pump The Limitor 2 is a reversible temperature switch When a fixed cut off temperature is reached a bimetal disk will snap over breaking a contact system and thereby inter rupting the electric circuit of the pump After cooling down and reaching the closing temperature the...

Page 56: ... outlet of pump 805 811 Remove wires from cable guide on lower pump holder 14 Unplug flat receptacle of pump wire from electronic mainboard see Replacing elec tronic mainboard Maestria on page 49 Remove flat receptacle from pump The Sysko pump is shown as example Position numbers of the Ulka Ceme pump and its accessory are indicated in brackets 805 811 58 14 ...

Page 57: ... between pump holder and holder 1 Then swivel screwdriver and move out pump assembly with flow meter 22 partly Remove upper pump holder 15 197 Press in both wedges one after another with a screwdriver and pull out upper pump holder from the machine Disconnect the cable from flow meter 22 and remove the pump assembly completely Upper 15 197 and lower 14 196 pump holders have stop pers and latches 1...

Page 58: ...ump holder 15 197 Replace a damaged pump holder Check that pump holder 15 197 fits correctly on pump 805 811 Press in and turn new flow meter until it is locked on lower pump holder 14 196 If the pump of a different manufacturer is used for replacement additional parts of the pump support etc must be exchanged too refer to annex of exploded drawings When inserting back the complete pump assembly w...

Page 59: ... Then pull it out of outer guiding groove laterally Remove spring clip 9 and reinforced hose 7 from pump outlet Remove pump from pump holder 5 Assembly checkpoints For tightness reason replace the following parts together with the steam pump Reinforced hose 7 2 spring clips 9 Make sure that pump holder is inserted in guiding grooves completely Pre assemble new pump in pump holder 5 with reinforced...

Page 60: ...sition 1 To release button lift clip 139 slightly with a small hook preferred or with a screwdriver if the push turn control module is already defect the screw driver will damage the connector case Pull off complete knob Espresso 812 Lungo 813 and replace if defect 1 802 803 139 812 813 Don t remove com pletely the clip 139 as it is not easy to put it back in place ...

Page 61: ...ased from latch A Remove screwdriver and use it to open both latches B of holder 152 one after the other Carefully remove push turn control module out of holder 152 Assembly checkpoints Position knob in position 1 before reassembly Do not exchange Espresso and Lungo push turn buttons Espresso 812 Lungo 813 by accident Verify that the light guide 153 is correctly placed and is visible from the outs...

Page 62: ...placing electronic mainboard Maestria on page 49 Loosen 2 screws TX 10 with screwdriver and remove On Off button assembly 804 For access to wiring open 4 latches and remove top cover with switch Assembly checkpoint After reassembly make sure that On Off button can be operated smoothly check auto shut off functionality see Auto shut off test in table on page 29 804 ...

Page 63: ...xle bolt and TX 10 and remove lever brake assembly 823 with other parts for Maestria EF 285 only Loosen 4 screws TX 10 and remove brewing unit 96 from holder 95 Loosen 4 screws TX 10 and remove lever 130 for re use Assembly checkpoint Respect the torque forces indicated in table of chapter Repair and mounting tips on page 40 823 130 96 95 The Gran Maestria has no lever brake ...

Page 64: ...der 95 together with brewing unit 96 Loosen 4 screws TX 10 and remove outlet casing 94 Unscrew steam nozzle manually and pull off frothing tube 822 from steam tube 91 Loosen 4 screws TX 10 from upper holder 93 Remove clip from steam pipe hose connection at steam tube holder 89 Remove upper holder 93 for access to inside parts or remove complete steam pipe assembly by pushing the steam tube 91 thro...

Page 65: ...Maestria Gran Maestria service manual 65 R E P A I R S Assembly checkpoint Replace the black seal 92 in housing 1 correctly 1 92 ...

Page 66: ...heck if permanent magnet 161 for drip tray is inserted in base 160 Remove mounting aid additional magnet if present Take care not to jam any wires between base and upper part especially wiring of electronic main board Wiring instructions and checks A final wiring check must be conducted before mounting the side panels and the bottom cover Refer to the following left and right side views for critic...

Page 67: ...Maestria Gran Maestria service manual 67 R E P A I R S Wiring on left side of Maestria Wiring instructions 1 Insert wires in comb like cable guide 2 3 4 5 6 7 8 1 ...

Page 68: ...I R S 2 Secure ground wires with retaining washer 3 Insert wires in comb like cable guide 4 Connect wires to micro switches cor rectly red wire is connected to top micro switch If in doubt test steam valve functional ity 5 Insert wires in cable clamp ...

Page 69: ...aestria Gran Maestria service manual 69 R E P A I R S 6 Insert wires to electronic main board in 2 cable guides 7 Insert wires to electronic main board in cable guide 8 Insert wires in latch at heat sink ...

Page 70: ...Maestria Gran Maestria service manual 70 R E P A I R S Wiring on right side of Maestria 1 2 3 4 5 6 ...

Page 71: ...nstructions 1 Pass wires towards Espresso and Lungo push turn control modules between brewing unit and its metallic holder Pass wires towards Espresso and Lungo push turn control modules between brewing unit and its metallic holder 2 Insert wires in 3 cable clamps ...

Page 72: ...ia service manual 72 R E P A I R S 3 Insert wires in cable guide 4 Insert wires in comb like cable guide 5 Insert wires in comb like cable guide Lay wire from pump behind pressure hose 6 Insert wires in latch at heat sink ...

Page 73: ... Open closing handle to check if a capsule is in the brewing unit Empty water system if hoses have to be detached for repair Switch machine off Disconnect power plug and let coffee machine cool down Remove milk frother 19 Take away water tank 801 Pull out cup support 185 by hand Remove maintenance unit capsule container 181 drip tray 814 with floater 179 drip tray cover 184 and drip grid 180 Pull ...

Page 74: ... Maestria service manual 74 R E P A I R S Place the coffee machine on a dismantling surface that will not damage or scratch the metallic housing of the machine Loosen 6 screws TX 20 and remove aluminium base 173 173 ...

Page 75: ...Maestria service manual 75 R E P A I R S Only if necessary Turn cable holder 175 to the side Remove power cord from strain relief and cable storage fixation Loosen 10 screws TX 20 and remove plastic base 174 174 175 ...

Page 76: ...ce manual 76 R E P A I R S Position a small permanent magnet as mounting aid at the base 141 to fix its coun terpart 142 142 141 A small permanent magnet 142 loosely inserted in the base acts as magnetic mounting for the drip tray ...

Page 77: ...en 4 upper fixing screws TX 20 of side panels Pull base 141 a little bit away from machine to release the side panels Lift up and incline the side panels to remove them Coffee machine is shown upside down for better visibility of fixing screws 149 148 141 Take care not to stress wiring and hoses between base and upper part ...

Page 78: ...tria Gran Maestria service manual 78 R E P A I R S Pull off spring clip 64 and remove the turning knob 117 from milk regulator 821 64 117 821 For easy removal lift spring clip with pliers away from housing ...

Page 79: ...2 vertically Lift upper part of housing 114 a little bit at the front side and pivote the housing from the back to the front following the lever Unplug connectors from the push turn controls 802 803 of the coffee buttons Remove upper part of housing 114 Remove light guide 115 from upper part of housing 114 112 802 115 803 114 ...

Page 80: ... wires with flat receptacles Loosen screw TX 20 of earthing point at base 141 and remove PE conductor connection to milk frother connector Loosen 3 screws TX 10 and remove complete milk frother connector assembly 167 168 172 Assembly checkpoints The blue and brown wires N and L have to be twisted together Check wiring see Wiring diagrams Gran Maestria EF 287 on page 104 and following Simplified ba...

Page 81: ...lat receptacles from micro switches on cup heater Pull clip from fluid connection and remove steam hose from thermoblock 810 Loosen 3 screws TX 20 and remove cup heater 820 from base 141 Assembly checkpoint Check cup heater wiring see Wiring diagrams Gran Maestria EF 287 on page 104 and following Simplified base illus tration 820 164 820 ...

Page 82: ...ours 1 Milk frother connector 4 colours 2 NTC 1 temperature sensor connector red coffee thermoblock 3 NTC 2 temperature sensor connector white cup heater thermoblock 4 Flow meter connector white 5 Lungo push turn control red 6 Milk regulator connector black 7 Espresso push turn control blue X11 Heat 2 cup heater thermoblock gray X10 Heat 1 coffee thermoblock white X9 N On Off button light blue X1 ...

Page 83: ... checkpoint Use cable guides on holder for milk regulator 77 and cable clips 111 to secure wires 7 5 6 Reassembly and wiring instructions Gran Maestria Reassembly checkpoints Check if light guide 115 is mounted before attaching upper part of housing 114 Check if permanent magnet 142 for drip tray is inserted in base 141 Remove mounting aid additional magnet if present Take care not to jam any wire...

Page 84: ...ring check must be conducted before mounting the side panels and the bottom cover Refer to the following left and right side views for critical places and spots where wiring problems can appear Wiring on left side of Gran Maestria For wiring of elec tronic mainboard refer to page 82 2 3 5 4 6 1 7 ...

Page 85: ...Maestria Gran Maestria service manual 85 R E P A I R S Wiring instructions 1 Insert wires in comb like cable guide 2 Secure ground wires with retaining washer 3 Insert wires in comb like cable guide ...

Page 86: ...estria service manual 86 R E P A I R S 4 Insert wires in cable clamp 5 Insert wires to electronic main board in 2 cable guides 6 Insert wires to electronic main board in cable guide 7 Insert wires in latch at heat sink ...

Page 87: ...Maestria Gran Maestria service manual 87 R E P A I R S Wiring on right side of Gran Maestria 1 2 3 7 6 4 5 ...

Page 88: ...nstructions 1 Pass wires towards Espresso and Lungo push turn control modules between brewing unit and its metallic holder Pass wires towards Espresso and Lungo push turn control modules between brewing unit and its metallic holder 2 Insert wires in 3 cable clamps ...

Page 89: ...tria service manual 89 R E P A I R S 3 Insert wires in cable guide 4 Insert wires in 2 cable guides 5 Insert wires in comb like cable guide 6 Insert wires in comb like cable guide Lay wire from pump behind pressure hose ...

Page 90: ...Maestria Gran Maestria service manual 90 R E P A I R S 7 Insert wires in latch at heat sink 8 Wire micro switches of cup heater in series ...

Page 91: ...ing for the coffee pump made by ULKA CEME while the other wiring diagrams show the wiring for the SYSKO coffee pump Depending on series and manufacturer the coffee pump is equipped with a different thermal protection device see Replacing coffee pump and flow meter on page 55 either a thermo fuse STB or a reversible temperature switch Limitor The type of thermal protection device used for the coffe...

Page 92: ... X11 X13 1 4 8 0 8 X12 1 4 8 0 8 Pump 2 X18 1 4 8 0 8 X19 1 4 8 0 8 X1 1 4 8 0 8 Aerocino shut down Pump2_SwitchA N F 1 2 3 4 5 6 JST 6 pol XH Connector X16 5V Poti2 SW2 LED2 LED4 GND 1 2 3 4 5 6 JST 6 pol XH Connector X22 5V SW3 Pot3 SW4 GND LED5 LED6 NTC2 NTC2 Common NTC2 1 2 3 4 5 6 SW1 GND Poti1 JST 6 pol XH Connector 5V LED1 LED3 X14 1 2 JST 2 pol XH Connector X27 X26 JST 2 pol XH Connector 1...

Page 93: ...8 Aerocino shut down Pump2_SwitchA N F 1 6 3 0 8 1 6 3 0 8 L N shut down 1 1 4 8 0 8 4 8 0 8 HEATER 1 PE V1 C1 1 1 THERMAL FUSE 1 1 THERMAL FUSE 1 2 3 4 5 6 JST 6 pol XH Connector X16 5V Poti2 SW2 LED2 LED4 GND 1 2 3 4 5 6 JST 6 pol XH Connector X22 5V SW3 Pot3 SW4 GND LED5 LED6 NTC2 Common NTC2 1 2 3 4 5 6 SW1 GND Poti1 JST 6 pol XH Connector 5V LED1 LED3 X14 1 2 JST 2 pol XH Connector X27 X26 JS...

Page 94: ...0 8 X12 1 4 8 0 8 Pump 2 X18 1 4 8 0 8 X19 1 4 8 0 8 X1 1 4 8 0 8 Aerocino shut down Pump2_SwitchA N F 1 2 3 4 5 6 JST 6 pol XH Connector X16 5V Poti2 SW2 LED2 LED4 GND 1 2 3 4 5 6 JST 6 pol XH Connector X22 5V SW3 Pot3 SW4 GND LED5 LED6 NTC2 NTC2 Common NTC2 1 2 3 4 5 6 SW1 GND Poti1 JST 6 pol XH Connector 5V LED1 LED3 X14 1 2 JST 2 pol XH Connector X27 X26 JST 2 pol XH Connector 1 2 1 2 3 4 JST ...

Page 95: ... 0 8 Aerocino shut down Pump2_SwitchA N F 1 6 3 0 8 1 6 3 0 8 L N shut down 1 1 4 8 0 8 4 8 0 8 HEATER 1 PE V1 C1 1 1 THERMAL FUSE 1 1 THERMAL FUSE 1 2 3 4 5 6 JST 6 pol XH Connector X16 5V Poti2 SW2 LED2 LED4 GND 1 2 3 4 5 6 JST 6 pol XH Connector X22 5V SW3 Pot3 SW4 GND LED5 LED6 NTC2 Common NTC2 1 2 3 4 5 6 SW1 GND Poti1 JST 6 pol XH Connector 5V LED1 LED3 X14 1 2 JST 2 pol XH Connector X27 X26...

Page 96: ...12 1 4 8 0 8 Pump 2 X18 1 4 8 0 8 X19 1 4 8 0 8 X1 1 4 8 0 8 Aerocino shut down Pump2_SwitchA N F 1 2 3 4 5 6 JST 6 pol XH Connector X16 5V Poti2 SW2 LED2 LED4 GND 1 2 3 4 5 6 JST 6 pol XH Connector X22 5V SW3 Pot3 SW4 GND LED5 LED6 NTC2 NTC2 Common NTC2 1 2 3 4 5 6 SW1 GND Poti1 JST 6 pol XH Connector 5V LED1 LED3 X14 1 2 JST 2 pol XH Connector X27 X26 JST 2 pol XH Connector 1 2 1 2 3 4 JST 4 pol...

Page 97: ...rocino shut down Pump2_SwitchA N F 1 6 3 0 8 1 6 3 0 8 L N shut down 1 1 6 3 0 8 6 3 0 8 HEATER 1 PE V1 C1 1 1 THERMAL FUSE 1 2 3 4 5 6 JST 6 pol XH Connector X16 5V Poti2 SW2 LED2 LED4 GND 1 2 3 4 5 6 JST 6 pol XH Connector X22 5V SW3 Pot3 SW4 GND LED5 LED6 NTC2 Common NTC2 1 2 3 4 5 6 SW1 GND Poti1 JST 6 pol XH Connector 5V LED1 LED3 X14 1 2 JST 2 pol XH Connector X27 X26 JST 2 pol XH Connector ...

Page 98: ... X12 1 4 8 0 8 Pump 2 X18 1 4 8 0 8 X19 1 4 8 0 8 X1 1 4 8 0 8 Aerocino shut down Pump2_SwitchA N F 1 2 3 4 5 6 JST 6 pol XH Connector X16 5V Poti2 SW2 LED2 LED4 GND 1 2 3 4 5 6 JST 6 pol XH Connector X22 5V SW3 Pot3 SW4 GND LED5 LED6 NTC2 NTC2 Common NTC2 1 2 3 4 5 6 SW1 GND Poti1 JST 6 pol XH Connector 5V LED1 LED3 X14 1 2 JST 2 pol XH Connector X27 X26 JST 2 pol XH Connector 1 2 1 2 3 4 JST 4 p...

Page 99: ...0 8 Aerocino shut down Pump2_SwitchA N F 1 6 3 0 8 1 6 3 0 8 L N shut down 1 1 6 3 0 8 6 3 0 8 HEATER 1 PE V1 C1 1 1 THERMAL FUSE 1 2 3 4 5 6 JST 6 pol XH Connector X16 5V Poti2 SW2 LED2 LED4 GND 1 2 3 4 5 6 JST 6 pol XH Connector X22 5V SW3 Pot3 SW4 GND LED5 LED6 NTC2 Common NTC2 1 2 3 4 5 6 SW1 GND Poti1 JST 6 pol XH Connector 5V LED1 LED3 X14 1 2 JST 2 pol XH Connector X27 X26 JST 2 pol XH Conn...

Page 100: ...8 X12 1 4 8 0 8 Pump 2 X18 1 4 8 0 8 X19 1 4 8 0 8 X1 1 4 8 0 8 Aerocino shut down Pump2_SwitchA N F 1 2 3 4 5 6 JST 6 pol XH Connector X16 5V Poti2 SW2 LED2 LED4 GND 1 2 3 4 5 6 JST 6 pol XH Connector X22 5V SW3 Pot3 SW4 GND LED5 LED6 NTC2 NTC2 Common NTC2 1 2 3 4 5 6 SW1 GND Poti1 JST 6 pol XH Connector 5V LED1 LED3 X14 1 2 JST 2 pol XH Connector X27 X26 JST 2 pol XH Connector 1 2 1 2 3 4 JST 4 ...

Page 101: ...hut down Pump2_SwitchA N F 1 6 3 0 8 1 6 3 0 8 L N shut down 1 1 6 3 0 8 6 3 0 8 HEATER 1 PE V1 C1 1 1 THERMAL FUSE 1 2 3 4 5 6 JST 6 pol XH Connector X16 5V Poti2 SW2 LED2 LED4 GND 1 2 3 4 5 6 JST 6 pol XH Connector X22 5V SW3 Pot3 SW4 GND LED5 LED6 NTC2 Common NTC2 1 2 3 4 5 6 SW1 GND Poti1 JST 6 pol XH Connector 5V LED1 LED3 X14 1 2 JST 2 pol XH Connector X27 X26 JST 2 pol XH Connector 1 2 1 2 ...

Page 102: ...0 8 X12 1 4 8 0 8 Pump 2 X18 1 4 8 0 8 X19 1 4 8 0 8 X1 1 4 8 0 8 Aerocino shut down Pump2_SwitchA N F 1 2 3 4 5 6 JST 6 pol XH Connector X16 5V Poti2 SW2 LED2 LED4 GND 1 2 3 4 5 6 JST 6 pol XH Connector X22 5V SW3 Pot3 SW4 GND LED5 LED6 NTC2 NTC2 Common NTC2 1 2 3 4 5 6 SW1 GND Poti1 JST 6 pol XH Connector 5V LED1 LED3 X14 1 2 JST 2 pol XH Connector X27 X26 JST 2 pol XH Connector 1 2 1 2 3 4 JST ...

Page 103: ...ck Fuse Heat1 Heat2 1 6 3 0 8 X9 6 3 0 8 1 X10 6 3 0 8 1 X11 X13 1 4 8 0 8 X12 1 4 8 0 8 Pump 2 X18 1 4 8 0 8 X19 1 4 8 0 8 X1 1 4 8 0 8 Aerocino shut down Pump2_SwitchA N F 1 6 3 0 8 1 6 3 0 8 L N shut down 1 1 6 3 0 8 6 3 0 8 HEATER 1 PE V1 C1 1 1 THERMAL FUSE 1 2 3 4 5 6 JST 6 pol XH Connector X16 5V Poti2 SW2 LED2 LED4 GND 1 2 3 4 5 6 JST 6 pol XH Connector X22 5V SW3 Pot3 SW4 GND LED5 LED6 NT...

Page 104: ...4 8 0 8 X12 1 4 8 0 8 Pump 2 X18 14 8 0 8 X19 14 8 0 8 shut down Pump2_SwitchA N F 1 2 3 4 5 6 JST 6 pol XH Connector X16 5V Poti2 SW2 LED2 LED4 GND 1 2 3 4 5 6 JST 6 pol XH Connector X22 5V SW3 Pot3 SW4 GND LED5 LED6 NTC2 NTC2 Common NTC2 1 2 3 4 5 6 SW1 GND Poti1 JST 6 pol XH Connector 5V LED1 LED3 X14 1 2 JST 2 pol XH Connector X27 X26 JST 2 pol XH Connector 1 2 1 2 3 4 JST 4 pol XH Connector R...

Page 105: ...own V1 C1 1 1 THERMAL FUSE 1 1 THERMAL FUSE 1 2 3 4 5 6 JST 6 pol XH Connector X16 5V Poti2 SW2 LED2 LED4 GND 1 2 3 4 5 6 JST 6 pol XH Connector X22 5V SW3 Pot3 SW4 GND LED5 LED6 NTC2 Common NTC2 1 2 3 4 5 6 SW1 GND Poti1 JST 6 pol XH Connector 5V LED1 LED3 X14 1 2 JST 2 pol XH Connector X27 X26 JST 2 pol XH Connector 1 2 1 2 3 4 JST 4 pol XH Connector RxD TxD 5V GND X3 1 2 3 JST 3 pol XH Connecto...

Page 106: ...0 8 Pump 2 X18 14 8 0 8 X19 14 8 0 8 shut down Pump2_SwitchA N F 1 2 3 4 5 6 JST 6 pol XH Connector X16 5V Poti2 SW2 LED2 LED4 GND 1 2 3 4 5 6 JST 6 pol XH Connector X22 5V SW3 Pot3 SW4 GND LED5 LED6 NTC2 NTC2 Common NTC2 1 2 3 4 5 6 SW1 GND Poti1 JST 6 pol XH Connector 5V LED1 LED3 X14 1 2 JST 2 pol XH Connector X27 X26 JST 2 pol XH Connector 1 2 1 2 3 4 JST 4 pol XH Connector RxD TxD 5V GND X3 1...

Page 107: ... down V1 C1 1 1 THERMAL FUSE 1 1 THERMAL FUSE 1 2 3 4 5 6 JST 6 pol XH Connector X16 5V Poti2 SW2 LED2 LED4 GND 1 2 3 4 5 6 JST 6 pol XH Connector X22 5V SW3 Pot3 SW4 GND LED5 LED6 NTC2 Common NTC2 1 2 3 4 5 6 SW1 GND Poti1 JST 6 pol XH Connector 5V LED1 LED3 X14 1 2 JST 2 pol XH Connector X27 X26 JST 2 pol XH Connector 1 2 1 2 3 4 JST 4 pol XH Connector RxD TxD 5V GND X3 1 2 3 JST 3 pol XH Connec...

Page 108: ...ump 2 X18 14 8 0 8 X19 14 8 0 8 shut down Pump2_SwitchA N F 1 2 3 4 5 6 JST 6 pol XH Connector X16 5V Poti2 SW2 LED2 LED4 GND 1 2 3 4 5 6 JST 6 pol XH Connector X22 5V SW3 Pot3 SW4 GND LED5 LED6 NTC2 NTC2 Common NTC2 1 2 3 4 5 6 SW1 GND Poti1 JST 6 pol XH Connector 5V LED1 LED3 X14 1 2 JST 2 pol XH Connector X27 X26 JST 2 pol XH Connector 1 2 1 2 3 4 JST 4 pol XH Connector RxD TxD 5V GND X3 1 2 3 ...

Page 109: ...1 C1 1 1 THERMAL FUSE 1 2 3 4 5 6 JST 6 pol XH Connector X16 5V Poti2 SW2 LED2 LED4 GND 1 2 3 4 5 6 JST 6 pol XH Connector X22 5V SW3 Pot3 SW4 GND LED5 LED6 NTC2 Common NTC2 1 2 3 4 5 6 SW1 GND Poti1 JST 6 pol XH Connector 5V LED1 LED3 X14 1 2 JST 2 pol XH Connector X27 X26 JST 2 pol XH Connector 1 2 1 2 3 4 JST 4 pol XH Connector RxD TxD 5V GND X3 1 2 3 JST 3 pol XH Connector X25 Cup Warmer Otter...

Page 110: ...8 Pump 2 X18 14 8 0 8 X19 14 8 0 8 shut down Pump2_SwitchA N F 1 2 3 4 5 6 JST 6 pol XH Connector X16 5V Poti2 SW2 LED2 LED4 GND 1 2 3 4 5 6 JST 6 pol XH Connector X22 5V SW3 Pot3 SW4 GND LED5 LED6 NTC2 NTC2 Common NTC2 1 2 3 4 5 6 SW1 GND Poti1 JST 6 pol XH Connector 5V LED1 LED3 X14 1 2 JST 2 pol XH Connector X27 X26 JST 2 pol XH Connector 1 2 1 2 3 4 JST 4 pol XH Connector RxD TxD 5V GND X3 1 2...

Page 111: ...n V1 C1 1 1 THERMAL FUSE 1 2 3 4 5 6 JST 6 pol XH Connector X16 5V Poti2 SW2 LED2 LED4 GND 1 2 3 4 5 6 JST 6 pol XH Connector X22 5V SW3 Pot3 SW4 GND LED5 LED6 NTC2 Common NTC2 1 2 3 4 5 6 SW1 GND Poti1 JST 6 pol XH Connector 5V LED1 LED3 X14 1 2 JST 2 pol XH Connector X27 X26 JST 2 pol XH Connector 1 2 1 2 3 4 JST 4 pol XH Connector RxD TxD 5V GND X3 1 2 3 JST 3 pol XH Connector X25 Cup Warmer Ot...

Page 112: ...8 Pump 2 X18 14 8 0 8 X19 14 8 0 8 shut down Pump2_SwitchA N F 1 2 3 4 5 6 JST 6 pol XH Connector X16 5V Poti2 SW2 LED2 LED4 GND 1 2 3 4 5 6 JST 6 pol XH Connector X22 5V SW3 Pot3 SW4 GND LED5 LED6 NTC2 NTC2 Common NTC2 1 2 3 4 5 6 SW1 GND Poti1 JST 6 pol XH Connector 5V LED1 LED3 X14 1 2 JST 2 pol XH Connector X27 X26 JST 2 pol XH Connector 1 2 1 2 3 4 JST 4 pol XH Connector RxD TxD 5V GND X3 1 2...

Page 113: ...RMAL FUSE 1 2 3 4 5 6 JST 6 pol XH Connector X16 5V Poti2 SW2 LED2 LED4 GND 1 2 3 4 5 6 JST 6 pol XH Connector X22 5V SW3 Pot3 SW4 GND LED5 LED6 NTC2 Common NTC2 1 2 3 4 5 6 SW1 GND Poti1 JST 6 pol XH Connector 5V LED1 LED3 X14 1 2 JST 2 pol XH Connector X27 X26 JST 2 pol XH Connector 1 2 1 2 3 4 JST 4 pol XH Connector RxD TxD 5V GND X3 1 2 3 JST 3 pol XH Connector X25 Cup Warmer Otter Connector P...

Page 114: ...0 8 Pump 2 X18 14 8 0 8 X19 14 8 0 8 shut down Pump2_SwitchA N F 1 2 3 4 5 6 JST 6 pol XH Connector X16 5V Poti2 SW2 LED2 LED4 GND 1 2 3 4 5 6 JST 6 pol XH Connector X22 5V SW3 Pot3 SW4 GND LED5 LED6 NTC2 NTC2 Common NTC2 1 2 3 4 5 6 SW1 GND Poti1 JST 6 pol XH Connector 5V LED1 LED3 X14 1 2 JST 2 pol XH Connector X27 X26 JST 2 pol XH Connector 1 2 1 2 3 4 JST 4 pol XH Connector RxD TxD 5V GND X3 1...

Page 115: ... 1 THERMAL FUSE 1 2 3 4 5 6 JST 6 pol XH Connector X16 5V Poti2 SW2 LED2 LED4 GND 1 2 3 4 5 6 JST 6 pol XH Connector X22 5V SW3 Pot3 SW4 GND LED5 LED6 NTC2 Common NTC2 1 2 3 4 5 6 SW1 GND Poti1 JST 6 pol XH Connector 5V LED1 LED3 X14 1 2 JST 2 pol XH Connector X27 X26 JST 2 pol XH Connector 1 2 1 2 3 4 JST 4 pol XH Connector RxD TxD 5V GND X3 1 2 3 JST 3 pol XH Connector X25 Cup Warmer Otter Conne...

Page 116: ... Hot parts and water under pressure inside the coffee machine Do not touch any hot parts while checking for leakages Always wear protective goggles Symbolic illustration of function test equip ment 1 Pressure gauge EFR no 16195 2 Maestria pressure gauge adaptor 3 Digital multimeter for NTC temperature sensor test 4 Flashlight 5 Electronic thermometer or digital multimeter suitable for temper ature...

Page 117: ... EF 285 and EF 287 The pressure gauge adaptor has 2 parts A connecting unit 3 with a sealing cone that is inserted in the capsule cage of the brewing unit A hand actuated fixation unit 4 to lock and seal the complete pressure gauge adaptor in the brewing unit 1 Quick action coupling for pressure hose 2 Operating lever 3 Connecting unit 4 Fixation unit 1 2 4 3 ...

Page 118: ...g pressure gauge adapter Insert the pressure gauge cautiously to avoid scratches on the metal housing 1 Open closing handle 2 Insert connecting unit in brewing unit 3 Turn connecting unit and insert seal ing cone into capsule cage 4 Insert fixation unit 5 Press down operating lever ...

Page 119: ...ill and insert water tank 2 Insert and lock pressure gauge adap tor in brewing unit see Mounting pressure gauge adapter on page 118 3 Connect pressure hose to pressure tester 4 Place a measuring cup under the drain hose of the pressure tester 5 Switch on coffee machine 6 After heating up set Lungo push turn control to 3 and push button 2 1 3 4 5 6 3 ...

Page 120: ...asurement for approx 30 sec 10 Control measuring cup at least 60 120 ml of water must be in the measur ing cup 11 Open the valve and let water flow out of the pressure tester Notices Should less than 60 ml leak out then the pump for coffee is defective or there is a leak in the water system for coffee Large deviations in indicated pressure while measuring 4 bar means that the pump for coffee is de...

Page 121: ...auge adapter on page 118 1 Remove milk frother 2 Remove cup support and maintenance unit 3 Remove both side panels refer to General disassembly Gran Maes tria on page 73 4 Fill and insert water tank 5 Insert and lock pressure gauge adap tor in brewing unit 6 Place a measuring cup under the drain hose of the pressure tester 7 Connect mains cable 8 Switch on coffee machine 2 3 4 1 5 6 7 8 ...

Page 122: ...mpletely The pres sure stabilizes after increasing briefly between 16 19 bar pressure check The pressure increases slowly with increasing temperature Should the pressure exceed 23 bar switch off the coffee machine and release the pressure by opening the valve 10 11 10 sec 9 3 For better visibility use a flashlight 12 Check all connections under pressure for audible and visible leaks Do not run the...

Page 123: ...al 123 F U N C T I O N T E S T S 9 5 Measure coffee temperature 13 Switch off the coffee machine 14 Open the valve and let water flow out of the pressure tester 1 Switch on coffee machine 2 Place a measuring cup on cup sup port 14 13 2 1 ...

Page 124: ... place it back on cup support 5 Insert capsule Cosi is best suited 6 Push Lungo button again in same position 7 Wait until the measuring cup contains 20 ml of coffee 8 Then measure the coffee temperature approx 5 10 mm under the coffee out let The coffee temperature should be 86 C 3 C 187 F 5 4 F 3 3 4 5 7 8 5 10 mm T2 T1 RA NG E 20 0 C 1370 C 32 8 F 2498 F 1 RE L HO LD T1 T2 T1 T2 C F MAX MIN 6 3...

Page 125: ...k preparation only Measure temperature immediately after preparation in jug The milk temperature should be between 64 C 4 C 147 F 7 F The disregard of this specification can affect the measuring results Milk frother dial Functions to be checked Pos 1 Cold function Check if liquid in milk frother stays cold Pos 2 3 4 Hot functions Check if liquid in milk frother heats up Pos 1 2 3 Foam functions Ch...

Page 126: ... equipped with 3 rips resp push buttons see detail to control the correct placement of a cup on the cup heater Only if all push buttons are activated together the cup heating process starts 1 Fill water tank 2 Switch on coffee machine 3 Press all push buttons separately and subsequently No water may come out of the cup heater 2 3 1 ...

Page 127: ...g the test Put a towel on the cup to protect your fingers 4 Press cup onto the cup heater until system is filled and hot water starts streaming Then release cup 5 Press cup onto the cup heater again until hot water stream stops automati cally 6 Check if cup has been sufficiently heated 4 5 6 ...

Page 128: ...a measuring cup 2 Switch on coffee machine 3 Turn steam handle to position ON to heat up steam circuit 4 Place measuring cup under steam pipe Make sure that steam pipe is immersed into water 5 Turn steam lever to steam position 6 Heat up water in measuring cup for 30 sec 7 Turn steam lever back to position OFF 100 ml 1 2 ON 3 4 5 30 sec 6 7 OFF ...

Page 129: ...anual 129 F U N C T I O N T E S T S 8 Check measuring cup The volume should be less than 120ml 9 Check if the temperature has signifi cantly increased 8 120 ml 9 T2 T1 RANGE 200 C 1370 C 328 F 2498 F 1 REL HOLD T1 T2 T1 T2 C F MAX MIN ...

Page 130: ...ctive earth continuity measurements are made between the protective earth terminal of the power plug and all conductive touchable parts of the coffee machine where dangerous voltage could occur if the basic insulation was to fail This test assures that the ground earth connection does not have an interruption between the power plug and the terminal block as well as touchable conductive housing par...

Page 131: ...ns in user manual of test equipment 1 Connect black measuring cable to ground pin of power plug with an insu lated alligator clip example shown Swiss power plug Symbolic illustration of test equipment 2 Switch on test equipment and select protective earth continuity test Test points for Maestria Choose one of the marked test points screw heads on base and one under head of coffee machine MEASURE L...

Page 132: ...rvice manual 132 F U N C T I O N T E S T S Test points for Gran Maestria Choose one of the marked test points screw heads on plastic base 174 on aluminium base 173 under head of coffee machine Metal jug of milk frother 173 174 ...

Page 133: ...brewing unit 78 Check measure ground connection on milk frother connector refer to page 80 and page 91 for wiring diagram Replace milk frother connector if necessary Clean ground contact on milk frother Measure resistance between ground contact and jug of milk frother Replace milk frother if necessary 3 Press tip of red test probe onto selected test point 4 Press measure button and read off displa...

Page 134: ... dangerous test because of a high test voltage 500 V DC For the insulation test phase and neutral wire are shunted at the power plug Then a test voltage is applied between phase neutral and selected parts of the coffee machine Test equipment Special test equipment is needed that complies with the regulations to perform insulation and withstanding voltage tests Detailed requirements and tolerances ...

Page 135: ...ral pin of the power plug together with a test adaptor procured by the repair centre 2 Connect the black measuring cable to the test adaptor see image 3 Turn the ON OFF machine s main switch on position I ON Symbolic illustration of test equipment 4 Switch on test equipment and select an insulation test voltage of 500 V DC MEASURE LOCK STOP COMP LIGHT 0Ω ADJ Schematic view with a Swiss power plug ...

Page 136: ...roubleshooting check list see see Troubleshooting on page 34 In case of doubt an insulation test on the milk frother alone can be carried out on the coffee machine Gran Maestria EF 287 touch phase and neutral contacts at the bottom with one test probe successively and the outside of the metallic jug with the other test probe If insulation test fails replace milk frother Risk of damage A sparkover ...

Page 137: ...Maestria Gran Maestria service manual 137 E X P L O D E D D R A W I N G S 1 0 E X P L O D E D D R A W I N G S 10 1 Exploded drawings for Maestria EF 285 ...

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Page 147: ...Maestria Gran Maestria service manual 147 E X P L O D E D D R A W I N G S 10 2 Exploded drawings for Gran Maestria EF 287 ...

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Page 155: ... cond 285 caps contain left 004 Clip 287 caps contain 005 Holder 285 pump black hot water steam 006 Pump EN4 220 240V 50 60Hz white Label white green 007 Hose silicone reinforced di 4 2 da 8 0 65mm PES reinforced 008 Fluid nipple I form 1x black D 5 6 4 8 009 Spring clip d 7 7x1 3mm V2 silicone hose 010 Molded tube 285 pump transp 60 Shore 011 O Ring 3 40x1 90 silicone 2 K 70 Shore red 2 comp sili...

Page 156: ... holder inox 081 Micro switch DB3A B1AA 0 1A 125 250VAC 082 Clip 285 steam valve inox 083 Hose FEP D4 0 2 50x75mm 2 clamp ring 2 tubul rivets 084 Connector 285 4x 6x plug 085 Holder 285 steam tube black lower 086 Tooth gear 285 steam lance neutral 087 Gear 285 steam lance black 088 Press spring 1 20 Da 8 70 L 13 5 n 5 9 inox ends flatened 089 Connect 285 steam tube black 090 O Ring 5 50x2 00 silic...

Page 157: ...85 drip tray red alu 183 Cup holder 285 Design C chrom 189 Screw GF Tapt M4 0x12 vz bl galvan rd head Torx 20 scraper cam 190 Hose silic 03 0x1 00x3 5 60 Shore transp 193 Screw KST PT 3 0x 8 bl galvan rd head Torx 10 CA point 195 Mult strd wire 285 EU brown 196 Holder 285 pump V2 197 Holder 285 pump V2 201 Molded tube 285 silic 202 Hose FEP D4 0 2 50x 90mm 203 Fluid nipple 660 elbow 90 801 Water t...

Page 158: ...r 285 pump black hot water steam 006 Pump NMEHP1 230 240V 50Hz 007 Hose silicone reinforced di 4 2 da 8 0 65mm PES reinforced 008 Fluid nipple I form 1x black D 5 6 4 8 009 Spring clip d 7 7x1 3mm V2 silicone hose 010 Molded tube 285 pump transp 60 Shore 011 O Ring 3 40x1 90 silicone 2 K 70 Shore red 2 comp silicone 013 Strd wire EU grey 160mm 0 75 1xFHWL4 8 Ni 1xFH4 8 Sn 017 O Ring 3 40x1 90 EPDM...

Page 159: ... upper 089 Cover 285 outlet black lower 108 Cover 285 electronic black lower 109 Connector 287 6x espresso button 110 Connector 287 6x coffee button 111 Cable holder 285 black 112 Lock rod 287 alu 114 Cover 287 upper 115 Light cond 287 cover 116 Rubber feet 483 TCBU black 60 Shore 121 Clip 285 button inox 134 Holder 285 coffee black 135 Light cond 285 cover print 141 Base 287 alu 142 Magnet 285 10...

Page 160: ...lic 205 Hose FEP D4 0 2 50x 90mm 801 Water tank 285 cpl 802 Espresso 285 cpl MMI 803 Coffee 285 cpl MMI 804 Switch 285 230V cpl on off 806 Spare electronic 287 230V 807 Cup holder 285 cpl 808 Spare valve lifter 285 packed 809 Spare thermobl 2010 285 230V IEC mount 810 Spare thermobl 2011 287 811 Spare pump 285 230V IEC V2 812 Spare button Espresso 285 813 Spare button Lungo 285 814 Spare drip tray...

Page 161: ...Maestria Gran Maestria service manual 161 N O T E S 1 2 N O T E S ...

Page 162: ...Maestria Gran Maestria service manual 162 N O T E S ...

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