12-3) Reset Circuit; 12-4) Eeprom Detection Circuit; 12-5) Door Switch Detecton Circuit - Samsung RB215B Series Service Manual

OPERATION PRINCIPLES BY PARTS OF CIRCUIT

12-3) RESET CIRCUIT

1) RESET Circuit allows the whole program to go back to the initial setting by initializing parts such as
the RAM in MICOM with the power supply into MICOM or with an instant power failure.
Upon the power supply,the reset terminal voltage becomes "LOW" for several tens of ㎲ compared to
Vcc voltage(DC 5V)at MICOM,and it maintains "HIGH"(Vcc Voltage)during normal operation.
But, when Vcc drops down to 3.4~3.7V, the reset terminal voltage becomes "LOW".

12-4) EEPROM DETECTION CIRCUIT

1) A semiconductor memory EEPROM stores data remembering previous settings regardless of
power-off,which are indispensable especially in power fluctuating areas.Also,EEPROM sets and
uses other options in principle.

12-5) DOOR SWITCH DETECTON CIRCUIT

Terminal
Vcc
Reset
48
Power
DC 5V
DC 5V