Buzzer Circuit Part; Fan Motor (Bldc) Driving Circuit Part - Samsung RL44Q Series Service Manual

REFERENCE INFORMATION 5. SELF DIAGNOSIS & TROUBLE SHOOTING

9-3-1-8) Buzzer Circuit Part

1) The circuit is made up as above. Alarms are separately controlled in the MICOM and
operated by sending different signals according to the setting value. (The several alarm
levels can be made according to key control.) The power of 12V is steadily impressed to the
circuit. When the MICOM sends an alarm signal to the transistor base, Q803, the transistor
is turned on to apply a current of 12V to the Buzzer. The resistance of 1Kohm, R804, is used
to get the better sound.

9-3-1-9) Fan Motor (BLDC) Driving Circuit Part

• Description of the motor driving circuit
1) To save power consumption, an BLDC Motor is used and this is only for the freezer
compartment. (The motor driving circuit is commonly used for other models.) The circuit for
the Condenser Fan is not applied but can be used in the future.
※ There is a LCD model which the BLDC Motor is not used but AC Motor is used. The LCD
Model which AC MOTOR is used is described in the Load Driving Circuit Part.
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