Samsung RL23DATS Service Manual page 10

7-4 E-magnetic valve
The bistable two way T-piece e-magnetic
valve is under the control of the pulse
generator that outputs semi-wave DC pulse
power to scan the coils once every 30s~60s
with 4~10 pluse semi-waves.
The e-magnetic will reverse with changing
pluse direction.
Operating principle
Exit 1
Entrance
Exit 2
Inspection method
Connect the appliance to power, press
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TEST key on the PCB:
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If pressing RF , the gateway is from
Entrance to Exit 2;
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If pressing FF , the gateway is from
Entrance to Exit 1.
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