LG LSSB2691ST Service Manual page 15

Micom Function
2-5. Control of variable type of freezer fan
1. To increase cooling speed and load response speed, MICOM variably controls freezing room fan motor at the high speed
and standard speed.
2. MICOM only operates in the high speed of RPM during initial power input, special freezing operation, and load response
operation MICOM operates in the standard RPM for other general operations.
3. If opening doors of freezing / cold storage room or home bar while fan motor in the freezing room operates, the freezing
room will run at normal speed.(If running at high speed, it will revert to the standard speed.) However, if the freezer door
or home bar door is open, the freezer fan motor will stop.
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 is a position signal for more than 65 seconds at the BLDC motor.
Then it displays a failure code. (refer to failure diagnosis function table) at the display part of refrigerator, performs re-
operation in the cycle of 30 minutes. If operation is normal, failure status halts and the refrigerator returns to the initial
status (reset).
2-6. Control of Mechanical Compartment Fan Motor
1. The Mechanical Compartment fan motor performs ON/OFF control by connecting to the compressor.
2. It controls at the single RPM without varying RPM.
3. It has the same failure sensing method of the fan motor in the Freezing fan motor. (refer to failure diagnosis function table
for failure display.)
2-7. Door opening alarm
1. The Buzzer generates alarm sound if doors are not closed even when more than a minute has passed with doors of
freezing / cold storage compartment or home bar opened.
2. The 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 compartment or home bar are closed during a door open alarm, the alarm is
immediately released.
Doors of freezing /
cold storage
compartment or
home bar
BUZZER
2-8 Ringing of button selection buzzer
1. If pressing the front display button, a 'Ding' sound rings.
2-9. Ringing of compulsory operation, compulsory frost removal buzzer
1. If pressing the test button in the main PCB, a beep sound rings.
2. In selecting forced 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 forced 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.
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