Philips Perfect Draft HD3620/20 Service Manual page 5

REPAIR INSTRUCTIONS
Stepmode Test
(Press & release
KEG switch)
0 Show software version
1 Display test
2 Temperature test
Disconnect NTC (J6)
from the PCB.
Apply to (J6) below
resistance values.
3 Pressure measurement
Disconnect Pressure
sensor (J14) Connect
external dummy.
Apply to the air inlet
of the sensor or air
coupling the following
pressures.
4 Fan motor low level
5 Fan motor high level
Stimulus Response
88
88
NTC simulated value Display indicates:
1. 1 kΩ (1%) 1.
2. 10 kΩ (1%) 2.
3. 51 kΩ (1%) 3.
4. out of range 4.
Pressure simulated Freshness indicates:
value (mV)
1. 0 - 2mV 1.
2. 4 - 6mV 2.
3. 8 - 10mV 3.
4. out of range 4.
Pressure simulated
value (mBar)
1. 0 - 300 1.
2. 600 - 900 2.
3. 1200 - 1500 3.
4. out of range 4.
1. Fan starts running.
2. Display Off.
1. Fan starts running.
2. Display Off.
Remark
Shows 2 digits. E.g. 21 = version 2.1
software
version
All segments
0
C
are lit
!
Replace NTC sensor by dummy
sensor.
1≅C (red color)
2≅C (green)
3≅C (red)
−
(red)
* Replace pressure sensor and apply
dummy.
1 (yellow)
2 (yellow)
3 (yellow)
− (yellow)
* Depending on the possibilities
either dummy or pressure can be
applied for testing.
* Apply calibrated air pressure to
the Pressure sensor or by the Air
1 (yellow) coupling hole.
2 (yellow)
3 (yellow) * Depending on the possibilities
− (yellow)
either voltage or pressure can be
applied for testing.
Keep KEG switch pressed!!
Fan runs on (80%) level
Voltage across fan:
~7 - 8.5 Vdc / ~0.25 Vrms
Keep KEG switch pressed!!
Fan runs on (100%) high level
Voltage across fan:
~10.5 Vdc / ~0 Vrms
HD3620/20
J6
19k
5k
1
J14
4k7 4k7
4k7 4k7
1k
5-13