Samsung AR09KSWSPWKNCV, Service Manual

Page: 138 / 150

Sa m s u ng El ectronics 11- 3
11-2-1 Pre-inspection Notices
1 . C h ec k i f y o u p ull ed o u t t h e AC power p lu g w h en y o u e l i m inate t h e PCB or f ront pane l
2. Don't h o l d t h e PCB side not i m pose e x cessi v e f orce on it to e l i m inate t h e PCB
3. Don ’ t p ull t h e l ead wire bu t h o l d t h e w h o l e h o u sing to connect or disconnect a connector to t h e PCB
4 . I n case o f o u tdoor PCB disasse m bl y , c h ec k f irst t h e co m p l ete disc h arge o f condenser a f ter 1 m in u te power o ff
11-2-2 Inspection procedure
1 . C h ec k connector connection and pee l ing o f PCB or b ron z e coating pattern w h en y o u t h in k t h e PCB is b ro k en
2. T h e PCB is co m posed o f 3 parts
•
I ndoor Main part : M I COM and s u rro u nding circ u it , re l a y , f an m otor sensing and dri v ing circ u it , te m perat u re sensing circ u it power
circ u it o f SMPS , buzz er circ u it. Co mm u nication circ u it
• Disp l a y part : LE D l a m p , Switc h , Re m ote - contro l m od ul e
•
O u tdoor Main part : M I COM and s u rro u nd circ u it , f an m otor sensing and dri v ing circ u it , co m pressor dri v ing circ u it power
circ u it o f SMPS , P F C contro l circ u it , 4 wa y circ u it , co mm u nication circ u it , OP TI ON (EE V contro l circ u it , te m perat u re sensing circ u it)
11-2-3 Indoor detailed inspection procedure
No Proced u re I nspection Met h od Ca u se
1
P lu g o u t and p ull t h e PCB
o u t o f t h e contro l b o x
C h ec k t h e PCB fu se
1 ) I s 1 st fu se disconnected ?
2) I s 2nd fu se disconnected ?
. O v er c u rrent
. I ndoor F an m otor s h ort
. AC part and pattern s h ort o f
I ndoor PBA
2
S u pp l y power
If t h e operating l a m p twin -
kl es at t h is ti m e , t h e a b o v e
1 ) ~ 3) h a v e no re l ation
C h ec k t h e power v o l tage
1 ) I s t h e BD 71 inp u t v o l tage
200Vac ~ 2 4 0Vac ?
. Power cord is f a ul t , Fu se open ,
Wrong Power ca bl e Wiring ,
AC part is f a ul t y
2) I s t h e v o l tage b etween b ot h ter -
m ina l o f I C02 pin #1-# 2 1 2Vdc ?
. Switc h ing T rans o f Power circ u it
is f a ul t y
3) I s t h e v o l tage b etween b ot h ter -
m ina l o f I C02 pin # 2 -# 3 5Vdc ?
. Power circ u it is f a ul t y , L oad s h ort
3
Press t h e ON/O FF bu tton
1 . F an speed ( h ig h )
2. Contin u o u s Operation
1 ) I s t h e v o l tage o v er AC 1 80V b eing
i m posed on ter m ina l # 3 -# 5 o f f an
m otor connector ( CN 7 2) ?
. F an m otor o f t h e indoor is f a ul t y
2) T h e f an m otor o f t h e indoor u nit
doesn't r u n
. F an m otor connector ( CN 7 2) is
f a ul t y
3) T h e power v o l tage b etween
ter m ina l # 3 -# 5 o f t h e
connector ( CN 7 2) is 0V
. PBA is f a ul t y