Panasonic NA-128VB6WSR, Service Manual, Page: 39 / 56

39
11.7. Door Lock
Door lock is activated at the beginning of the program in
order to prevent the door from opening. Locking is gener-
ated 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.
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 over-
load + solenoid) should be 240

±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).
NA-128VB6
NA-148VB6
Component test