Philips Senseo Latte Duo HD7857/50 User manual

Published by Philips Consumer Lifestyle Printed in the Netherlands © Copyright reserved Subject to modification
ServiceManual
Philips Consumer Lifestyle
Senseo®Latte Duo
HD7857/50
HD7857/51
13/10
PRODUCT INFORMATION
Safety
• This product meets the requirements regarding
interference suppression on radio and TV.
• After the product has been repaired, it should function
properly and has to meet the safety requirements as
officially laid down at this moment.
TECHNICAL INFORMATION
• Voltage : 220 - 240 V
• Frequency : 50 Hz
• Power consumption : 2450 W
º Boiler : 1450 W
º Thermo block : 1200 W
• Color setting : Beluga & Deep Black
• Dimensions (WxDxH)
º Appliance : 210 x 315 x 290 mm
º F-Box : 285 x 390 x 334 mm
• Materials
º Housing : PA, PP,ABS
º Spout, collector : PP
º Water container : PP
º Drip tray : ABS
• Stand-by power consumption : 0,5 W
• Brewing pressure : 1,6 Bar
• Steam pressure : 1,0 Bar
• Water container capacity : 1,0 L
• Auto shut-off time : 15 min
• Volumes and recipes, see table:

HD7857/50 / HD7857/51
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TECHNICAL INFORMATION
General Coffee and Milk specications:
In-cup volume (in mL)
Black coffee Milk recipe
Normal Strong Cappuccino Latte Macchiato Café Latte
General WEU version 122
*60 *
160
*220 *190 *
France specic version 100
*60 *
*Inuenced by personal coffee preference, to be programmed by the consumer plus or minus 37% of the indicated values.
Temperature indication (in °C) ** Black coffee
Milk recipe
Cappuccino Latte Macchiato Café Latte
General WEU
74 72 69 63 67
France Specic
Measurement specications:
Water spec **
(without pod, in mL)
Black coffee Milk recipe
General WEU France Specic Coffee (water) Milk (water) Total (water)
1-cup (with 1-cup podholder) 133 ± 10 111 ± 10 72 ± 10 68 ± 10 140 ± 10
2-cups (with 2-cups podholder) 2 x 133 ± 10 2 x 111 ± 10 2 x 72 ± 10 2 x 68 ± 10 2 x 140 ± 10
Temperature indication water **
(in °C)
General
WEU
France
Specic
74 72
** Only valid for the default personal coffee preference setting
Note: Please note that the HD7857 and HD7858 models are equipped with a personal preference for each recipe. Make sure to
select the default setting. (Press CALC button + recipe to change, for 2 seconds, until the appliance beeps. To select default
volume press the Milk only button 6. Next the appliance proceeds to make the desired recipe.)
Capacitive User interface layout
CALC
AUTO OFF
Calc LED & Button
1. Café Latte
2. Latte Macchiato
3. Cappuccino
1-cup LED 2-cup LED
4. Normal Coffee
Milk only 6.
Strong Coffee 5.

HD7857/50 / HD7857/51
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TECHNICAL INFORMATION
Hydraulic owchart
Steam
connector
Thermo
block
Boiler
Water
Container
Venting
valve
Steam
pump
Water pump
Inside the appliance
Overpressure
valve
p
mn
jj l
hh
ff
ee
gg
bbccdd
k
Three-way valve
Brew
head
gh
e
d
f
aa jcb
o
ii
ia
Legend: Low pressure tube
High pressure tube
Low pressure connections
High pressure connections
a - p
aa - jj
PCBA layout and functional schematic
P
P
NTC
Fuse
Fuse
TCO
NTC
Fuse
Fuse
Brewhead
sensor
Water level
sensor
N
E
L
Boiler
Thermoblock
Pump
Steam
pump
UI
PCBA
WSS
PCBA
J2
Blue wire
AMP2
AMP7
Yellow wire
AMP4
White wire
AMP3
Black wire
Brown wire from cordset
AMP1
AMP6
Red wire
AMP10
Brown wire
AMP8
Brown wire
AMP5
Brown wire
J7
Water level
NTC-B
J4
J6
Brewhead switch
J3 - UI
NTC-TB
J5
AMP9
Brown wire
-t
-t

HD7857/50 / HD7857/51
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TECHNICAL INFORMATION
Tools
Tools required for repair and diagnostics are:
• Flathead screwdriver # 0, # 2
• Torx screwdriver (T15)
• Cutter
• Cable tie tightening tool
• Digital Multimeter
º Fluke 116 or comparable device with a base accuracy for temperature of 0,05 % or ±0,3 °C Temperature probe
80PK-22 (80AK-A Thermocouple adapter required)
• Scale
º KERN EMB 500-1 or comparable device with a base accuracy of 0,05 % or ±0,5 g
• Power meter
º Voltcraft EnergyCheck 3000 or comparable device with a base accuracy of 1 % or ±5W
• Stopwatch
º Basic model
Note: All measurement devices need to be calibrated, certied and traceable to the international standards/laboratories.

HD7857/50 / HD7857/51
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DISASSEMBLY- AND RE-ASSEMBLY ADVISE
Remove all loose parts like Driptray, water container and
pod-holders.
Remove the back cover.
• Remove the four Torx screws (A) (T15) from the back
cover.
• Carefully unhook the back cover from behind the both
side covers.
• Use a flathead screwdriver to undo both snap hooks on
either side of the back cover
• The back cover can now be tilted forward.
• Two hoses are still connected to the water container
socket, they can be removed for easy access.
Remove the front cover.
• Place the appliance on its backside, to be able to reach
the underside.
• Use a flathead screwdriver to undo both snap hooks.
1
2
Remove the side covers.
• To be able to remove the side covers the top cover
surrounding the lid needs to be removed, to do this two
snap hooks need to be undone, they can be reached via
the opening of the back cover.
• Unlatching the hooks needs some force, once undone
you need to open the brewchamber to be able to
completely remove the top cover.
• Unscrew both screws (B) on top side of the appliance,
they were previously covered by the top cover.
• Place the appliance on its backside, now you can undo
the snap hooks (two on either side) , then you can
remove the side panels.
With all covers removed you are able to reach all main
components:
- Pump
- Boiler
- Steam pump
- 3-way valve
- Thermo block fuses
- Brew head

HD7857/50 / HD7857/51
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DISASSEMBLY- AND RE-ASSEMBLY ADVISE
Remove the brewhead.
• Unhook the 3-way valve from the Brew chamber back
frame and undo the hose from the 3-way valve to the
brew chamber.
• Unhook the boiler from the boiler support on the Brew
chamber bottom.
• Unhook the Brewhead detection sensor from its
mounting and disconnect the UI cable from the Main
PCBA (J3) to the brewhead, and undo its routing
through the inner frame.
• The Brew head can now be tilted forward and removed
from the appliance.
Remove the PCBA
• To be able to remove or replace the PCBA it is the
easiest to open the appliance up until you have the Brew
head removed.
• Carefully unplug all connectors on the lower right side
of the PCBA for the NTC’s, Brew head switch and water
level sensor.
• Disconnect the Brown and Blue lead from the Cordset
on the left side of the PCBA
• Undo all fixed leads from their routing through the
frame. They are going to: Boiler,Thermo block, Steam
pump and Water pump.
• The PCBA is held in place by one screw (E) in the center
of the PCBA.
Open the brew head lid
• To be able to open the lid of the brew head, remove the
front, back and side covers.
• Disconnect the UI cable from the Main PCBA (J3) to the
brewhead, and undo its routing through the inner frame.
• Undo the hose from the 3-way valve to the brew head.
• Use a flathead screwdriver to unhook one side of the
hinges of the brew head lid. Carefully feed the hose and
cable through the frame.
• To open the lid, undo the eight snaphooks holding the
lid in place. To be able to remove the lid completely the
lever needs to be in the Open position (flipped up).
Note: Please make very sure that all wires you have
undone will be put back properly and with
the same routing as they have originally been
designed.
Note: Any tie-wrap that has been cut must be
replaced by a new one as specied on the Parts
list, and tightened with a force of 115 N.

HD7857/50 / HD7857/51
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REPAIR INSTRUCTION
Boiler / Brew chamber
1. Brewhead sensor wire must be taped as far away from
the boiler wires as possible. (EMC)
2. Boiler wires over the boiler, not behind or in front of
the boiler. (Safety)
2
1
PCBA – Ty wraps
After PCBA replacement:
1. Ty-wrap Black,Yellow and White lead close to the
connection of the white lead on the PCBA. (Safety)
2. Ty-wrap Black,Yellow,White, Blue and Red lead close
to the connection of the red lead on the PCBA.
(Safety)
3. Ty-wrap Black,Yellow,White, Blue, Red and 4x brown
close to the connection of the lowest two brown
wires on the PCBA. (Safety)
1
3
2
Cordset, Earthwire and Thermoblock
1. Ferrite bead must be in place and ty-wrapped to lter
out interference. (EMC)
2. “Clean” Brown and Blue wire must be ty-wrapped to
Earth-wire close the Thermo-block. Earth-wire must
be as far away from the cord-set as possible. (EMC)
3. Two Black fuse-wires to Thermo-block must run
horizontal to the right, running behind the Steam-
pump. (Safety)
3
2
1

HD7857/50 / HD7857/51
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REPAIR INSTRUCTION
Descaling
Scale builds up inside the machine during use. It is essential
to descale the SENSEO®coffee machine when the CALC
light goes on. If the descaling procedure is not performed
correctly, scale residue remains behind in the machine.
This causes scale to build up more quickly and may cause
permanent and irreparable damage to the machine.
Use the correct descaling agent Use SENSEO®Descaler
(HD7012, HD7011, HD7006) only. It has been developed
to ensure better machine performance and operation.
Never use a descaling agent base on mineral acids such as
Sulphuric acid,Acetic acid (vinegar) or Hydrochloric acid.
These descaling agents may damage your SENSEO®coffee
machine.
For detailed instructions please refer to the Directions for
Use, Chapter Descaling.
Volume adjustment
Note: Volume adjustment may only be carried out in case the
repair technician is sure there is no other underlying
cause (e.g. leakage, incorrect voltage settings etc.) for
the deviation in volume from the factory default.
How to adjust the volume output:
1. Make sure the boiler is lled properly, otherwise
perform the Flush before rst use procedure,
according to the instructions in the DFU
2. Switch the appliance on, and wait until the unit is ready.
3. Place either the 1-cup or the 2-cup pod holder in the
appliance without a coffee pod.
4. Calibrate a scale with the cup you are going to use for
the measurement.
5. Press the Normal coffee button once, to make a
normal cup of water. (when nished also poor the
contents of water left in the pod holder into the cup)
6. Measure the output and compare to the specications
on Page 2.
7. Determine the deviation from the specication, the
deviation can be adjusted in steps of 3,5 mL.
The deviation divided by 3,5 will tell you how many
steps you need to in-, or decrease.
8. Follow the steps as mentioned under Service modes -
Manual pump calibration to re-calibrate the pump.
9. Measure the newly programmed volume.

HD7857/50 / HD7857/51
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Service modes
The appliance is equipped with a dedicated service mode. The service mode enables you to carry out some settings and tests.
Please note, as the appliance is equipped with a capacitive touch panel as a user interface, special attention is required
to be able to enter several service modes. The capacitive buttons need 0,5 seconds to initialize after the mains is
connected. During this timeslot the capacitive buttons must not be touched, otherwise you will not be able to enter the
service modes.
• Manual pump calibration
Calibration-step 0: Entry to calibration mode
1. Connect mains;
2. After 0.5 second and before 1.5 second operate Button 2 and Button 5 simultaneously.
On/off LED will be switched ON.
3. Release all switches.
On/Off LED will be switched OFF.
Calibration-step 1A: Decrease calibration value
1. Push (and release) button 2 to decrease the calibration value.
The On/Off LED will be ON for 0.5 seconds.
2. Repeat step 1A.1 when required.
Calibration-step 1B: Increase calibration value
1. Push (and release) button 5 to increase the calibration value.
The On/Off LED will be ON for 0.5 seconds.
2. Repeat step 1B.1 when required.
Calibration-step 2: Store calibration value
1. Operate the On/Off button.
On/Off LED will blink fast for 1.0 seconds and the calibration value is stored.
2. Release all switches
The On/Off and 1-cup LED will be OFF
Calibration-step 3: End mode
1. Disconnect mains End test program
REPAIR INSTRUCTION

HD7857/50 / HD7857/51
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• Sensor & LED test
To validate the assembly and electrical correctness of an appliance, especially during testing and debugging phase, a sensor
and LED test is very useful. Please keep in mind that it is not an automated test and only intended as indication.
Test-step 0: Entry to test mode
1. Connect mains;
2. After 0.5 second and before 1.5 second operate Button 2, On/Off button and Button 5.
3. Release all switches.
4. All LEDs will be ON for 1.0 seconds and after that switch to OFF again.
Test-step 1: Button identication
1. Manually operate a button.
The related LED - refer to the table below - will be ON.
2. Release the button.
The related LED - refer to the table below - will be OFF.
Sensor LED LED on LED off
Decal button Decal LED Button pressed Button released
Button 1 1-cup LED Button pressed Button released
Button 2 1-cup LED Button pressed Button released
Button 3 1-cup LED Button pressed Button released
On/Off button On/Off LED Button pressed Button released
Button 4 2-cup LED Button pressed Button released
Button 5 2-cup LED Button pressed Button released
Button 6 2-cup LED Button pressed Button released
Test-step 2: Entry sensor mode
1. Operate Button 2, On/Off button and Button 5.
2. Release all switches
3. All LEDs will be ON for 1.0 seconds and after that switch to OFF again.
Test-step 3: Sensor identication
1. Manually operate a sensor.
The related indicator - refer to the table below - will be activated.
2. Release the sensor.
The related indicator - refer to the table below - will be deactivated.
Sensor LED LED on LED off
NTC Boiler On/Off LED NTC error NTC OK
NTC Thermo block Decal LED NTC error NTC OK
Water level sensor 1-cup LED Water present Water low or no water present
Brew head sensor 2-cup LED Brew head closed Brew head open
Test-step 4: End test
1. Disconnect mains end test program
• Boiler reset
Boiler reset-step 0: Entry to boiler reset mode
1. Connect mains.
2. After 0.5 second and before 1.5 second operate Button 3 and Button 4.
3. Release all switches
The On/Off LED will blink fast for 0.5 second.
REPAIR INSTRUCTION