Samsung RS757LHQESR/ Series Service Manual page 36

FUNCTION OFR FAILURE DIAGNOSIS
※ Self-diagnostics check list
LED Item
Communication Error
41
between Main ↔
Panel
Communication Error
44
between Main ↔
Inverter
Communication Error
46
between Main ↔ I/O
Expander
Abnormal High
71
Temperature of
Freezer
72
Abnormal High
Temperature of Fridge
81
Comp Startup Failure
82
Comp IPM Fault
83
Abnormal Current
Pick-Up at Comp
84
Comp Motor
Restriction
85
Comp Low Voltage
86
Comp High Voltage
Trouble contents
When there is no communication
between MICOM MAIN ↔ PANEL for
more than 10 seconds, the MICOM
MAIN ↔ PANEL Communication Error
Window will show on the Display.
Display 44Er in the panel :
Inverter MICOM ↔ Main MICOM
communication error.
Display 46Er in the panel :
I/O Expander ↔ Main MICOM
communication error.
The error occurs when the Freezer
temperature rises abnormally or when
the Freezer Door remains open for a
while while the unit's inside temperature
is high.
The error occurs when the Fridge
temperature rises abnormally or when
the Fridge Door remains open for a
while while the unit's inside temperature
is high.
When the Comp Startup Failure is
detected
When the Comp IPM Fault is detected
When the Abnormal Current is pick-up
at the Comp
When the Comp Motor Restriction is
detected
When the Low Voltage is detected at
the Comp
When the High Voltage is detected at
the Comp
35
Diagnostic method
To check its defect, a Oscilloscope is
needed. So, replace the MAIN PCB and
check if the problem persists.
Actually, If there is not a problem, it is
desirable to replace Main and Inverter
PCB With the oscilloscope after a cable
problem confirming.
It is desirable to replace Main PCB.
When its Door remains open for an
extended time or high temperature food
is stored, close the Door or take out the
hot food. Then, after a while, the error will
disappear.
When its Door remains open for an extended
time or high temperature food is stored,
close the Door or take out the hot food.
Then, after a while, the error will disappear.
1. Short between Comp. U/V/W (CN04)
2. Short between IPM PIN (#1~26)
3. IPM Operation Voltage Dropdown
(Lower than DC13.5V)
4. Check Comp and Cycle
1. Comp Connector Plugged Out (CN04)
2. R1 Defect or Assembly Defect
3. Check Comp and Cycle
1. When the Comp is restricted for more
than 5 seconds
2. When the Comp runs at lower than
1000RPM for over 5 seconds
3. R1 Short
4. Severe fluctuation of Input Voltage
5. Check Comp and Cycle
1. Input AC Voltage 106V or lower
2. When R312 is short (DC Link Resistor)
1. Input AC Voltage 310V or higher
2. When R309, R310 or R311 is short (DC
Link Resistor)