Mitsubishi Electronics MR-385R-ST-A ユーザーズマニュアル

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

6.4.2 ) Fucntion display

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

2. Check the resistance of thermistor

Change part

2. Check the resistance of thermistor

Change part

2. Check the resistance of defrost heater

Change part

3. Check the resistance of temp. fuse

Change part

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

Improve in contact 

Improve in contact 

1. Check connector of control PCB CN1  , 

relay connector temp. fuse

3

2

1

Improve in contact 

LED display self - check

Malfunction display

Lighting mode

1 time

2 times

3 times

Defrost unfinished 

with in 2 hours

Fault trouble of defrost thermistor 

Fault trouble of freezer thermistor 

Fault trouble of defrost heater 

Open circuit or short 

circuit case

Open circuit or short 

circuit case

- 18 -

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

∞

  

Ω

 , 

resistance of short circuit is

 

0

Ω

1. Check connector of control PCB CN5 , relay 

connector 6 pin

1. Check connector of control PCB CN5  , 

relay connector 2 pin

ON

OFF

5 Sec.

Cycle

2 times

1 time

Cycle

Cycle

Cycle

5 Sec.

5 Sec.

5 Sec.

1 time

1 time

1 time

2 times

2 times

2 times