Samsung RS257BABB Service Guide - Page 46

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Diagnostics 11-2) If the compressor and cooling fan motor don't work normally Start NO Did 5 min pass after COMP. OFF? YES Apply Ref. 7 Does compressor work with forced operation? YES Did buzzer sound on forced operation? (Check certainly after forced start.) NO Apply Ref.4 NO Is MICOM No.28 High?(5V) Check after a lapse of 5 min. Is freezer sensor normal? YES Exchange MICOM and PCB. YES NO Is the voltage of IC03 pin No. 13 between 0-1V? Exchange and repair IC03. YES (ULN2803) Apply Ref. 2 NO Is COMP relay normal? YES NO Is the contact of connector CN70 normal? Is the temp. sense of main PCB Normal? YES Open and troubleshoot the connection. Exchange or troubleshoot COMP relay. NO Open and repair the connection. NO Troubleshoot the sensor and Exchange PCB. YES Is COMP assembly normal? YES Normal Insert connector completely? NO Exchange and repair COMP. assembly. 46

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46
Diagnostics
11-2) If the compressor and cooling fan motor don’t work normally
Apply Ref.4
Did 5 min pass after COMP. OFF?
Start
Check after a lapse of 5 min.
Apply Ref. 7
Did buzzer sound on forced operation?
(Check certainly after forced start.)
Exchange MICOM and PCB.
Exchange and repair IC03.
(ULN2803)
Does compressor work
with forced operation?
Is MICOM No.28 High?(5V)
Open and repair the
connection.
Troubleshoot the
sensor and Exchange
PCB.
Is the voltage of IC03 pin No. 13 between 0-1V?
Open and troubleshoot the
connection.
Is COMP relay normal?
Exchange or troubleshoot
COMP relay.
Apply Ref. 2
Is the contact of connector CN70 normal?
Insert connector completely?
Is COMP assembly normal?
Exchange and repair COMP.
assembly.
Normal
NO
YES
YES
NO
NO
NO
NO
YES
NO
YES
YES
YES
NO
YES
NO
YES
NO
YES
Is freezer sensor normal?
Is the temp. sense
of main PCB Normal?