Mitsubishi Electronics MR-385R-ST-A(NZ), MR-455R-W-A Malfunction Display and Checking points

6.4 Malfunction Display and Checking points.

6.4.1) Malfunction display will use LED for show self-check

6.4.2) Fucntion display

1 time	2 times
ON
OFF		Cycle

1 time 2 times

5 Sec.	5 Sec.
	Cycle

1 time 2 times 1 time 2 times

5 Sec.	5 Sec.
Cycle	Cycle

6.4.3 ) Repairing and check point

* A the case below , if the analysis result has malfunction over 2 points and will express in the list has more importance.

		Function display			Cause	Analysis result		Check point		Corrective	Priority Repairing
				1 time	Fault trouble of freezer thermistor	Open circuit or short	1.	Check connector of control PCB CN5 , relay		Improve in contact	1
-						circuit case	connector 6 pin
18
-
							2.	Check the resistance of thermistor		Change part
	selfdisplayLED- check	displayMalfunction				Open circuit or short	1.	Check connector of control PCB CN5	,	Improve in contact
			modeLighting	2 times	Fault trouble of defrost thermistor		1.	Check connector of control PCB CN1	,		2
						circuit case	relay connector 2 pin
							2.	Check the resistance of thermistor		Change part
						Defrost unfinished	relay connector temp. fuse			Improve in contact
				3 times	Fault trouble of defrost heater						3
						with in 2 hours
							2.	Check the resistance of defrost heater		Change part
							3.	Check the resistance of temp. fuse		Change part
	Caution

1.Before plug in the AC power , Be ensure the comp had been off more than 20 min.

2.The consider short circuit or open circuit of thermistor , resistance of open circuit is ∞ Ω , resistance of short circuit is 0 Ω