Troubleshooting - Philips HD5720/30 Service Manual

TROUBLE SHOOTING
Technical related problems.
Warning:
!
Live Voltage is applied to the micro switches used in the appliance!!!!!
Always disconnect plug from the mains when repairing!
When the appliance generates a GENERIC ALARM message, the only way to reset this is
by unplugging the power plug from the mains.
Problem description /
"Error" message displayed
1. Appliances doesn't work
at all.
2. MESSAGE
GENERIC ALARM !
3. MESSAGE
PLEASE WAIT......
4. MESSAGE
CLOSE DOOR !
5. MESSAGE
INSERT WASTE BIN !
= changed
FAILURES AT PLUGGING IN APPLIANCE
Actions to perform
Check if main voltage is applied on the main
PCB (vertical PCB on the right side) by
measuring the voltage (220 - 230 V) on the
connector F3 and F4.
(see electrical drawing scheme)
• Check micro switch (M1) top position
brewing unit and it's circuit.
• Check NTC sensor (J5) heater and it's
circuit.
• Check Hall sensor (J3B) motor lift and it's
circuit.
• If a normal motor sound of the brewing
unit lift is noticed, but the brewing unit
doesn't move, check the driving belt.
• If a motor sound is noticed and afterwards
you hear a hard noise sounding like a
blocked motor and the brewing unit stays
at bottom position, check the micro switch
(M2) bottom position brewing unit and it's
circuit.
• If no motor sound is noticed, check the
wire connection of the motor and see if
voltage has been applied on the motor side.
• If no motor sound is noticed and also no
voltage has been measured on pins F7 &
F8 PCB probably the 2 relays on the main
PCB became defect.
• Close the service door.
• Check the function and circuit of micro
switch (M4).
• Check if the micro switch mechanical will
be activated if the door is closed.
• Place waste bin.
• Check the function and circuit of micro
switch (M3).
• Check if the micro switch mechanical will
be activated if the waste bin is placed.
HD5720/30
Hints/tips/solution
If no voltage is present:
check power cord and connections!
If voltage is present, check all electrical
connections on the PCB, otherwise exchange
PCB.
• Micro switch is NC (normally closed)
(exchange switch)
• Value NTC resistor at 23 °C ± 110 kΩ
➟ ± 95 °C = 5.3 kΩ
• Value measured on PCB J5
(without NTC) ± 10 kΩ
• If the GENERIC ALARM message
appears after the brewing unit went down,
most probably the Hall sensor/connections
is the problem.
(counting of pulses starts after actuating
the brewing unit_down_position M2, so
going up direction!)
• Belt broken, replace belt.
• Replace micro switch (M2).
• If voltage on the motor circuit board has
been applied, motor is probably defect.
Exchange total brewing unit lift assy.
• Exchange main PCB
• Exchange micro switch. (M4).
• Exchange micro switch. (M3).
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