SAMSUNG RT57EAMS Schematic
2
1) Relay check
1. CIRCUIT DIAGRAM
** Cut off the power supply, separate the
housing connected to MAIN PCB
CN71 and measure followings.
1. Measure the resistance between
terminals as below, and carry out fault
detection for LOAD & L/W
* With power on, chech out the state of RELAY/Operation Circuit according to the LOAD state as below.
LOAD
EV ALUATION
Defrost Heater
COMP
F FAN MOTOR
DOOR Heater
R Lamp
R Lamp
Measuring
Parallel
V alue
Opening
Door
CN71 3 - 1
CN71 5 - 1
CN71 5 - 1
CN71 5 - 1
CN71 7 - 1
CN71 7 - 1
MEASURING
TERMINAL(M.T.)
Operation
Defrost &
COMP OFF
RY72 CONTACT SHORT/
Operational Circuit ERROR
RY71 NO CONTACT SHORT/
Operational Circuit ERROR
RY72 OR RY71 NO CONTACT SHORT/
Operational Circuit ERROR
RY71 NO OPEN /Operational Circuit ERROR
RY72 or RY71 NC CONTACT OPEN /Operational
Circuit ERROR
RY71 NO SHORT /Operational Circuit ERROR
COMP ON
Defrost ON
RELA Y
RY72 & 71
SV(Source
voltage)
SV
SV
OV
OV
OV
RY71
RY72 & 71
RY71
RY72 & 71
RY71
M.T. RESULT DIFF. RESULT
CN71 7 - 3
CN71 7 - 5
CN71 7 - 3
CN71 7 - 5
CN71 7 - 3
CN71 7 - 5
1-1) Circuit descriptions
3
* Separate the housing connected to MAN PCB CN30/CN50 and do a checkout.
* Resistance decreases with increasing Temp with a NYC Sensor.
1. To check out FRE. Sensor, measure the resistance of CN50 8 -
10
2. To check out Defrost Sensor, measure the resistance of CN50 8 - 9
3. To check out Ambient Sensor, measure the resistance of CN30 1 - 2
4. Compare the above values with the Sensors' present Temps and those in the Temp table included in the
MANUAL PARTS SPEC, and evaluate.
2) Sensor check
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