Samsung AM080*XV Series, Service Manual

Page: 201 / 277

T roub l eshooting
Sa m sung El ectronics 4-81
4-3-54 Inverter Overheat error
Outdoor unit
disp l a y
( INV ERTER1 P CB )
( INV ERTER 2 P CB )
J udg m ent
Method
∙ I G B T m odu l e interna l te m perature : 1 05 ° C m ore than
(E 500 , E4 00 )
Cause of
prob l e m
∙ Coo l ing P in and the I G B T j unction part asse m b ly defecti v e.
∙ R efrigerant coo l ing heat sin k and refrigerant piping
asse m b ly defecti v e.
∙ Asse m b l ed bo l t defecti v e.
* E nforce the discharge m ode before P o w er Off.
(K 2 : press the 6 ti m es )
Both end resistance v a l ues of I G B T m odu l e pin (8, 9 pin )
T ab l e 1
Measure the resistance after the po w er is turned off.
T e m perature [° C ] N T C [ oh m]
1 0 9 000
20 6000
30 4 000
4 0 3000
50 2000
60 1 600
70 1 200
8 0 750
1 . Cause of prob l e m
Co m p l ete
Y es
Y es
Y es
App ly the heat sin k grease and then
reasse m b ly .
No Did proper ly app ly the heat sin k grease ?
( Bet w een the heat sin k and the I P M )
Y es
T ighten Bo l t ( Scre w)
R e m o v e foreign ob j ects and app ly the heat
sin k grease. And then reasse m b ly
No
No
Is the bo l t of the heat sin k fu lly tightened ?
Did chec k the foreign ob j ects bet w een the heat
sin k and I P M ?
R ep l ace In v erter P CB.
: E 500 ( Botto m), E4 00 (T op )
No
I P M ( I G B T) m odu l e
pin 8, 9 : Is it nor m a lly both end resistance v a l ue ?
(R efer to tab l e 1)
P o w er Off
G ood No G ood
I G B T m odu l e pin 8, 9
G rease Ser v ice Code : DB 81- 02 48 3A