28
Circuit Descriptions
When the power is supplied to MICOM, the reset
circuit initializes RAM and other sectors of MICOM.
A reset voltage maintains “low” for hundreds of µsec
comparing to MICOM Vcc voltage when the power is
in. It also maintains “high”(5V) during normal
operation. But, when Vcc drops to 3.4V-3.7V, a reset
port becomes “low”.
Port
Vcc
Reset
Voltage
DC 5V
DC 5V
1) If a door is open, the door S/W contact is closed. Then MICOM receives “low” signal and
detects door open, A relay control circuit receives “HIGH” signal and turn Lamp on.
2) If a door is closed, the door S/W contact is open. Then MICOM receives “high” signal and
detects door close, A relay control circuit receives “LOW” signal and turn Lamp off.
DOOR
F
R
Door Conditions
CLOSE
OPEN
CLOSE
OPEN
Door S/W Contact
OPEN
CLOSE
OPEN
CLOSE
MICOM
PIN NO
# 39
# 40
Micom Input Voltage
“HIGH”
“LOW”
“HIGH”
“LOW”
10-3)Reset Circuit
10-4) Door S/W Sensing Circuit
Summary of Contents for RB2044SL
Page 1: ...Model RB2044SL Bottom Mounted Freezer SAMSUNG Home Appliance Service ...
Page 7: ...7 5 WARRANTY INFORMATION ...
Page 11: ...11 Refrigeration Cycle and Cool Air Circulation Route 7 2 Cool Air Circulation ...
Page 33: ...33 Circuit Descriptions ...
Page 37: ...37 Diagnostics 5 If the defrost sensor of the freezer has trouble ...
Page 40: ...40 Diagnostics 11 5 If the refrigerator fan doesn t work ...
Page 41: ...41 Diagnostics 11 6 If the compressor cooling fan motor doesn t work ...
Page 43: ...43 Diagnostics ...
Page 45: ...45 Diagnostics 2 If beep sounds continuously 3 When the digital panel PCB does not light ...
Page 46: ...46 Diagnostics 4 When a button of the digital panel is not selected ...
Page 49: ...49 11 PCB Circuit Diagram ...