LG SxS GR-P247 Service Manual page 48

EXPLATION FOR MICOM CIRCUIT
1-11. Communication circuit and connection L/Wire between main PCB and display PCB
The following circuit is a communication circuit used for exchanging the necessary information between main MICOM of
main PCB and LCD dedicated MICOM for LCD control of display PCB.
Transmission/receipt L/Wire together with the necessary display PCB for driving the display PCB is required.
Poor communication occurs if a continuous information exchange fail to continue for more than 2 minutes between main
MICOM of main PCB and LCD dedicated MICOM for LCD control of display PCB.
Main MICOM
1) GR-P247, L247, P207, L207
FRZ TEMP
REF TEMP
DISPENSER
Main PCB L/Wire FD/H(4-wires)
Transmission (error status)
Reception
Transmission
MIN
TEMP
MIN
TEMP
WATER CRUSHED
DC 12V
GND
Reception (notch status)
MAX
MAX
OFF
ROOM
TEMP
CUBED
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Display PCB
LCD dedicated MICOM
12Vdc
Transmission
GND
Reception
LOCK
SUPER FRZ