10-7) Load Drive Circuit - Samsung RB1955SWRB1955SH Service Manual

Circuit Descriptions

10-7) Load Drive Circuit

1) Most of relays can control the compressor, heaters and several option functions.
2) For the compressor, #12 pin of MICOM signals HIGH(5V). This signal enters to #2 of IC03 and #15
of output terminal will be on and grounded. When the rely RY71 is switched to NO terminal a 115V
power is supplied to the compressor. If MICOM outputs LOW(0V), the compressor will stop.
3) If the RY71 is connected to NC, RY72 and 73 for defrost heaters will be on and corresponding heater.
RELAY
Defrost Heater
COMP
on
on
off
off
Will be activated according to the signal from MICOM. Like the above block diagram, operation of F,
R defrost heater is determined by the operation of the relay for COMP.
off
Comp Operation
on
Comp off, Defrost-Heater Off
on
Defrost-Heater On
off
Comp Off, Defrost-Heater Off
Load
31
Remark
Defrost-Heater Power Off
Comp Power Off