Panasonic NA-147VC6WFR, Service Manual

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11.7. Door Lock
Door lock is activated at the beginning of the program
in order to prevent the door from opening. Locking is
generated by supplying power to PTC-bimetal, after
max 6sec (220V), the bimetal will be warm and ready
to close the contacts. Thus the first impulse to the
solenoid will allow the contact to close and
consequently the slider will be locked by the pin of the
sliderlock. The second impulse causes no electrical
and mechanical modifications. It can be unlocked by
the third impulse; the contact is opened even if the
PTC-bimetal remains energized.
Emergency Opening System (PTC-Bimetal) In Case
of Lack of Electric Energy
• In case of lack of electric energy during a washing
cycle, the PTC-bimetal assembly will cool down and
after minimum 60 sec (considering previous power
supply of 30 sec min and T=20
° C) the door will be
unlocked and thus can be opened.
• In case the door is closed when current comes back,
the PTC-bimetal assembly will heat again, the slider
lock will lock, the contact will close and the program
will continue from where it stopped.
Door lock
Technical features
Nominal voltage 250 V
Testing component
Check the resistance value on the component with multi-meter as shown in below figures. Resistance value on the (PTC
ov solenoid) should be 240
Ω ±20% at 25 °C. That resistance value can be measured from terminal 3-4 (refer to
section12 Wiring Connection Diagram).
You can determine the ohm value of PTC by measuring from cables those are shown in the figure below as 3 and
4. (Referring X3 on the wiring diagram).
Component test
2
3
4
5
3
4