LG LSXC22326, Service Manual

Page: 16 / 78

Doors of freezing /
cold storage room
or home bar
BUZZER
Micom Function
2-5. Control of variable type of freezing room fan
2-6. Control of M/C room fan motor
2-7. Door opening alarm
2-8 Ringing of button selection buzzer
2-9. Ringing of compulsory operation, compulsory frost removal buzzer
1. To increase cooling speed and load response speed, MICOM variably controls freezing room fan motor at the high speed of
RPM and standard RPM.
2. MICOM only operates in the input of initial power or special freezing operation or load response operation for the high
speed of RPM and operates in the standard RPM in other general operation.
3. If opening doors of freezing / cold storage room or home bar while fan motor in the freezing room operates, the freezing
room fan motor normally operates (If being operated in the high speed of RPM, it converts operation to the standard RPM).
However, if opening doors of freezing room, the freezing room fan motor stops.
4. As for monitoring of BLDC fan motor error in the freezing room, MICOM immediately stops the fan motor by determining that
the BLDC fan motor is locked or poor if there would be position signal for more than 65 seconds at the BLDC motor.
Then it displays failure (refer to failure diagnosis function table) at the display part of refrigerator, performs re-operation in the
cycle of 30 minutes. If normal operation is performed, poor status is released and refrigerator returns to the initial status
(reset).
1. The M/C room fan motor performs ON/OFF control by linking with the COMP.
2. It controls at the single RPM without varying RPM.
3. Failure sensing method is same with freezing fan motor.(refer to failure diagnosis function table for failure display).
1. Buzzer generates alarm sound if doors are not closed even when more than a minute consecutively has passed with doors
of freezing / cold storage room or home bar opened.
2. Buzzer rings three times in the interval of 0.5 second after the first one-minute has passed after doors are opened and then
repeats three times of On/Off alarm in the cycle of every 30 seconds.
3. If all the doors of freezing / cold storage room or home bar are closed during door open alarm, alarm is immediately
released.
1. If pressing the front display button, “Ding ~ “ sound rings.
1. If pressing the test button in the main PCB, “Phi ~ “ sound rings.
2. In selecting compulsory operation, alarm sound is repeated and completed in the cycle of On for 0.2 second and Off for 1.8
second three times.
3. In selecting compulsory frost removal, alarm sound is repeated and completed in the cycle of On for 0.2 second , Off for 0.2
second, On for 0.2 second and Off for 1.4 second three times.