Samsung RF20HFENB Service Manual page 53

TROUBLESHOOTING
4-2-7. If alarm sounds continuously without stop (Related with buzzer sound)
Preliminary Inspection
1. The alarm of freezer / fridge will sound(Ding-dong) after 2minutes from initial door open, and it keeps sounding(ding-dong)
at 1 minutes intervals when opening afterward.
2. The alarm sounds because MICOM sense as door-open when door is not pressed completely. So refrigerator inner lamp
will be OFF after 10minutes from sensing door-open. In this case, the inner lamp will not ON though the door is opened
actually.
① If 'ding-dong' sounds continuously.
Door & MICOM State
F
Door
MICOM(#60)
Close 0V(Low)
5V(High)
Open
Separate the door switch and check if the measured
value of unit is changed from 0Ω Ω to œ œ Ω Ω according to
switch On/OFF.
* Fridge Door Switch is magnetic switch. (It can be
operated when door magnet is combined)
② If 'beep-beep' sounds continuously.
Is door closed
completely?
penetrated into the door
R
voltage of Main #60 & #52
MICOM(#52)
changed at door-open &
door-close?
0V(Low)
5V(High)
connector(CN30) inserted
correctly?
S/W itself(unit)
Main PCB & Door switch
Is manual
operation / defrost
selected?
Does buzzer
sound when Power On
Replace PBA Main Test
part, Solder Touch, &
Main PCB
Start
Is water
switch?
Is input
Is the
Is Door
normal?
Recheck
Start
again?
53
Remove the cause after comprehending
the conditions of interference by door
gasket, food, etc.
Replace door switch
Repair the trouble of wire connection
and door switch
Repair the bad inserting of connector
and bad contact.
Replace door switch
Cancel the manual operation / defrost
function.
Normal