LG GR-GR-L257BTBA Service Manual page 39

EXPLATION FOR MICOM CIRCUIT
3. Door opening sensing circuit
1) GR-P257, L257, P217, L217
2) GR-C257, B257, C217, B217
Door of Freezing/Cold Storage Room
Closing
Opening
✽ Since door switch sensing switch (A), (B) are a separate switch even if the door switch of the freezing room normally
operates, they may fail to sense door opening in the failure of switch at both ends of (A) and (B) or in failure of the L/wire.
✽ Lamp does at the cold storage room not turn on if the door switch of the cold storage room fails to sense the door open
switch (C), (D) or the home bar switch.
Measuring part
5 V ( A - B , C - D . S/W at both ends are at Off status)
0 V ( A - B , C - D . S/W at both ends are at On status)
IC1 (MICOM) No. 45, 46 Pin
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