40
11-5. Refrigerator damper inferiority
Decide that the abnormal or not after
measurement of resistance value of
damper connection part.
1) Refrigerator D/P motor is composed of stepping motor.
2) It has not self diagnosis function because MICOM cannot detect an abnormal running of D/P motor.3. Among
the damper running, signal by step cannot be measured by the general tester. So, confirm by naked eye the
running state at the time of power on with reference to the above method and circuit diagram.
Reference
Start
Is the D/P motor run for a time
when power on?
Disassemble refrigerator damper assembly.
(Housing connection connectors keep up the assembly.)
Power off and ON again.
Exchange the main PCB assembly or
D/P motor assembly
In case of power on, perform a time of open/close
running to confirm that D/P motor run or not.
▣
Measure after PBA main CN72 disassembly
-. ①-② (black, brown):150Ω±15%
-. ③-④ (white, blue):426Ω±15%
-. ⑤-⑥ (yellow, red):426Ω±15%
Y
Repair the connection connector.
N
Y
Repair the connection connector.
N
N
Is there any abnormality
of main PCB CN72 connection
connector?
Y
1)
When D/P motor in refrigerator is failed, weak cooling and over cooling can be occurred.
2) If the inferiority is occurred at the state of D/P motor open, refrigerator is over cooling. And at the state of close,
refrigerator is over cooling. In thisases, it is the abnormality of refrigerator damper system. Refer to the followings.
Condition for decision
Is there any abnormality of D/P motor
part connection connector?
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