Page 1
Samsung Electronics 9-1
9. Troubleshooting
9-1 Amplifier
9-1-1 Power Malfunction
FRONT PCB µ-com VDD(5V)
normal?
UIC1 pins 18,46,72,90
Yes
FRONT PCB
Does UX2(6MHz)
oscillate ?
Yes
Check the UIC1 :
pin 51 Vp (-23.5V)
Replace µ-com
Yes
No
FRONT PCB P/OFF-SENSE
voltage normal ?
(pin 92 ; 5.0V)
Check the Main PCB :MCON5
FCW1-WIRE/AD18,AZD3
No
FRONT PCB UIC2(78L05)
OUT: (5V) output
voltage normal
No
No
No
Check the Main PCB
AZD4,6/AZD5 : 25V
normal ?
Replace AZD4,5,6
No
Replace µ-com
Yes
Check the connector
FRONT /MAIN PCB(FCW1/FCW2)
Yes
Replace µ-com
Yes
Check the AQ2(D882) ?
No
Replace AQ2(TR:D882)
Yes
Check the Fuse
Page 2
9-2 Samsung Electronics
9-1-2 FLT Malfunction
Connector inserted
correctly?
No
Check voltage : AC 2.6V
at FRONT-PCB FLT?
No
Check Main-PCB Front PCB
connection and the voltage of
FCW2, pins2,3(AC 2.6V)
Check voltage at UIC1
pin 51(-25V)
No
Check the voltage of AZD4,6(-25V)
Replace UIC1(LC866XXX)
Yes
Yes
Yes
Reinsert the connector
Troubleshooting
Page 3
Samsung Electronics 9-3
9-1-3 No Output
No
Check the AQ7,8,12
Base B+ ?
Is mute selected ?
Yes
Check if the output line is
short.
Check the JIC1(TDA7440D)
B+ of Function-IC
No
Check the MCON5/CABLE-WIRE
Replace JIC1(TDA7440D)
No
Main PCB AIC1(TA8270K)
pins 3,12 B+(15~16V)
No
Check the Fuse
Check the Power-Trans
Yes
No
Replace Fuse
FRONT PCB µ-com pins 2
Check the "H"
Yes
Check the AQ1,3,4
Replace µ-com
Yes
Restore sound with remocon
No
Check for TR short
Replace it.
Yes
Yes
Troubleshooting
Page 4
9-4 Samsung Electronics
9-2 CD
9-2-1 Disc Revolution Malfunction
Power On and CD Function
Is CD : B+ = 8V
Is CD LSI : Vcc = +5V
Check NTR1,NFR1,NIC9258
(SHORT/OPEN)
Yes
No
Yes
Yes
Yes
No
No
-Check Oscillation of MXF1(16.93MHz)
-Check the signal of NC05
(MDATA,MCK,MLT)
-Check the limit switch(#3,#4 of NC03)
-Check pin #43 of KB9223(SLO)
-Check pin #11,#12 of KA9258
Is focus search done
properly?
-Check pin #3 of KB9223(FRSH)
-Check pin #48 of KB9223(FEO)
-Check pin #1,#2 of KA9258
-Check pin #73,#75,#76 of KS9286
-Check pin #23,#24,#25 of KB9223
-Check pin #46 of KB9223(SPDLD)
-Check pin #17,#18 of KA9258
-Check Spindle Motor of CD DECK
-Check pin #69,#70 of KB9223
-Check TR NQ100, Resistor NR14
-Check Laser Diode of pick-up
-Check pin #74,#75 of KB9223
-Check NC125(472)
No
No
No
No
Yes
Yes
Yes
Yes
Does SLED move to inner?
Check Power Line of Main Board
Does laser ON during
focus search?
Is FOK "H"?
Does Disc rotate ?
Next Page
Troubleshooting
Page 5
Samsung Electronics 9-5
State of rotation is properly
Signal of RFO is properly
(#74,#75,#76,#77)
Check Parts NC123(105Z),NC124(472K),
NC125(472K),NR125(472J),
NR126(183J)
Yes
No
Yes
Yes
Yes
No
No
-Check pin #53,#54,#50,#49 of KB9223
-Check pin #58,#59 of KB9223
-Check pin #26,#27 of KA9258
Does it read Disc ?
Check Parts NC110,NC90,NC89
END
OK
NG
Change CD Deck
Change IC
Troubleshooting
Page 6
9-6 Samsung Electronics
9-3 MP3
9-3-1 Recharge
Check line of AC-3 and fuse
of BF1 ?
Check voltage(+5V) for BQ2002
of BIC1 ?
Check connection of condition
from MCW2 to BCW3.
Check voltage(+5V) for
78L05 of BIC2 ?
Check High of BIC1 pin8,
and condition
Batt-Sense of BQ10 ?
Check condition of Batterise
that peel off the sheath on the negative
pole side from the new batteries
by 5 mm using a knife before charging them
Check collector(B+) for A614
of BQ1 ?
Replace A614 of BQ1
Check condition of BQ2
Yes
No
Yes
No
Check voltage line(+5V) for
Vcc of Main ?
No
Yes
No
Yes
Yes
No
Yes
Check S/W of Batt-Sense,
and Batterise Spec
NO Recharging Batteries
Page 7
Samsung Electronics 9-7
9-3-2 No play
Check voltage(+5V) for B+ of
AUIC3,AUIC4 ?
Check FUSE of BF1 and voltage(+4.7V)
for Z-Diode of BZD1 ?
Check connection of Con-wire
for LCW1,MCW2,BCW3.
Check voltage(+5V) for
B+ of AUIC5 ?
Check Lineof AC-3 ?
Check High for pin3,6,20
of AUIC3 ?
Check oscillation(24MHz) of
AUX1 ?
Replace AUX1
Yes
No
Yes
No
Replace BF1 and BZD1
No
Check voltage line(+5V) for
Vcc of AQ1 ?
No
Yes
Yes
No
Yes
No
Replace AUIC3,AUIC4
No
Check circuit of AUIC3,AUIC4
and short
Yes
Check connction for Flat-Cable
from FCW1 to MCON5.
NO PLAY
Page 8
9-8 Samsung Electronics
9-3-3 Encoding ;Only S-2450
Check D882 of EQ1 and
ZD of EZD1 ?
Check connction for Connect-Wire
of MCW1
Check connction for
Connect-Wire of BCN5
Check condition for
EQ3(C945) = High,
EQ2(R2003) = Low
Check Lineof AC-4 ?
Recheck "No Play" of section
previeous page.
Replace BCN5
Replace Encoder- Pack
Yes
No
Yes
No
Replace BF1 and BZD1
No
Yes
Yes
No
Yes
Delete MP3 file of SMC-Card
No
Check memory of SMC-Card
Yes
Yes
NOT Encoding from CD to MP3
Check voltage for P/T
Check connction for Connect-Wire
of EW1.
Check condition for OP Amp of EIC1
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