Samsung RF28HMEDBSR Service Manual page 99

4-2-14. If Cover Ice Route Motor(Geard Motor) is not working normally
Caution
1. When replacing the Cover Ice Motor, pull out the plug to avoid an electric shock.
2. Be careful! When disassemble the Cover Ice Motor, spring can jumped out and may cause personal injury.
3. Motor will rotate continuously when the Motor Switch is not sensed.
☞ Checking Mehod of Cover Ice Route Motor
Resistance
(Make sure to work after Power Off)
the voltage of Resistance is variable
according to the input voltage.
CN70 -"5" (Red) ↔ CN73_1 -"3" (Blue)
** 0Ω: Short trouble / Ω∞: Open trouble
When the MOTOR
rotates.
① Check CN73_1-"3" Connector / Re-connect
② Check the short/open for the SSR75 of Cover Ice Motor on Main PCB.
③ Check the voltage of Resistance of parallel Connector CN73 -"3",
Operating Condition of Dispenser
Open/Close
CN50 - Switch 1,2 Operating
Close ing
Ice Route Switch 1
0V 5V
CN50 - "9" (Purple)
Ice Route Switch 2
0V 5V
CN50 - "10" (White)
① Main PCB - Check the wire OPEN/SHORT between the Cover Ice Motor Rotation sensing switches.
② Check the Short of Cover Ice Motor Control Circuit SSR75 in the MAIN PCB.
③ Replace the MAIN PCB or the Dispenser Cover Motor.
Start
Does GEARED MOTOR
work properly?
Is Cubed or Crushed
Ice mode selected on the
LED PANEL?
Is the DISPENSER
switch selected?
Does the wiring at the
both sides of motor connected
properly?
Is the AC input voltage
applied to the both ends
of the motor?
CN70 -"5"
(Definitely plug out prior to repair)
Is the sensing
SWITCH connection
normal?
Is the switch
pressed area normal when
motor rotates?
Are the voltage
Open
J23 JUMMPER and CN50-"9",
"10" normal?
0V
0V
No
Replace the MOTOR
Yes
No
Cubed or Crushed Ice is selected
Yes
on the LED PANEL PCB
No
Select the DISPENSER switch
Yes
No
Check the WIRE
Yes
Yes
Check the MOTOR/Check any
No
interference on MOTOR rotation
No
Yes Check/Repair the Housing
connector
No
Check/Repair the Motor Rotation
Yes
pressing area
Yes
No
99
TROUBLESHOOTING
Normal