Philips Senseo Latte Duo HD7857/50 Service Manual page 10

REPAIR INSTRUCTION
• 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 identifi 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
Decal button
Button 1
Button 2
Button 3
On/Off button
Button 4
Button 5
Button 6
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 identifi 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
NTC Boiler
NTC Thermo block
Water level sensor
Brew head sensor
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.
LED LED on
Decal LED Button pressed
1-cup LED Button pressed
1-cup LED Button pressed
1-cup LED Button pressed
On/Off LED Button pressed
2-cup LED Button pressed
2-cup LED Button pressed
2-cup LED Button pressed
LED LED on
On/Off LED NTC error
Decal LED NTC error
1-cup LED Water present
2-cup LED Brew head closed
HD7857/50 / HD7857/51
LED off
Button released
Button released
Button released
Button released
Button released
Button released
Button released
Button released
LED off
NTC OK
NTC OK
Water low or no water present
Brew head open
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