Samsung RB195BSSB Service Manual - Page 50

OPERATION PRINCIPLES BY PARTS OF CIRCUIT 12-7) ICE MAKER OPERATION CIRCUIT 1) The ice maker circuit above is to control the ice maker kit installed on the F room. This circuit is the hardware to control ejection and horizontal positioning,ice making temperature detection and full icing detection. Temperature detection circuit is the same as temperature detection circuit on 4-6 and the explanation will be skipped and only the ejection circuit will be explained. If MICOM PORT NO #7 is outputted with High to rotate motor in ejection direction and the pin #5 of IC90 is inputted,12V is outputted on pin #2 of IC90,goes to motor and supplied to pin #10 of IC90. The current flows to the pin #10 of IC90 making motor rotates.This motor rotates the gear and rotates the ejection tray.The tray twists to separate the ice from the tray and return to the horizontal state. For restoration,motor stops for 2 seconds when the ejection is completed and to rotate in opposite direction,output horizontal MICOM PORT NO #46 with high and perform horizontal positioning. Motor rotation for ejection operates for 8.3 seconds and stays for 2 seconds.Horizontal positioning rotates motor in opposite direction and it stops when the horizontal switch becomes ON (Low)or when the voltage of the motor voltage sensing part (MICOM PORT #60)is over 0.55V. The test S/W is off in normal cases and MICOM PORT 50 stays high.When necessary,press the switch for more than 1.5 seconds executing forced ejection.Full S/W has a lever that detects the amount of ice in the ice-maker kit and based on the status of MICRO S/W connected to the lever, if ice is full in the container,ejection is not executed,and only if it is off (MICOM PORT 48 is high), the ejection is executed. 50