Philips 4000 Service Manual page 30

PHILIPS 4000
Page 3 (BU): This test directs the correct operation of the Brew Unit
Insert a full Water Tank
The indication H20 changes from "N" to "Y".
Note: the switching from "N" to "Y" requires about 1-2 seconds.
ERROR: If the indication TANK-H2O doesn't change, check the water sensor
and the wiring (JP23 Electrical diagram)
Insert the BrewUnit
The indications BU-P changes from "N" to "Y".
Note: removing the BrewUnit the indication from "Y" to "N" requires about
2-3 seconds to switch.
ERROR: If the indication BU-P doesn't change, check the BU presence Micro-
switch and the wiring (JP16 Electrical diagram).
Close the Door and Dreg Drawer
The indication DOOR change from "N" to "Y"
ERROR: If the indication DOOR does not change, check the Microswitch for
the door and the wiring (JP14 Electrical diagram).
Note: without the Dreg Drawer correctly inserted the DOOR indication can-
not change!
Move Lever to Coffee Position
The indication DRIP change from "N" to "Y"
ERROR: If the indication DRIP does not change, check the lever sensor, the
connector in PCB interface (JP4 Electrical diagram) or the cabling between
lever sensor and interface
Move the lever in Espresso position
The indication ESP change from "N" to "Y"
ERROR: If the indication ESP does not change, check the lever sensor, the
connector in PCB interface (JP4 Electrical diagram) or the cabling
between lever sensor and interface.
Press Z7 " " to move to the next screen
The machine passes to the Page 3 (BU PAGE)
Start condition
Press the Z1 button to move the BU to Work
IMPORTANT NOTE: If the DREGDRAWER is not inserted or the DOOR is
not closed the BU test cannot be performed. If these 2 inputs are not in the
right position, a warning message will be shown and the display turns to yel-
low for HD models or red for EP models.
04 DIAGNOSTIC MODE
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