Page 1
Front PCB µ-com VDD(5V)
normal?
UIC1 pin no. 18,46,90
Check the Main PCB
RIC2(MC7805),FJ1
Check the Front PCB
UD9(1N4002), CN1-1
Main PCB RIC2(MC7805) IN: 12V
Input voltage normal?
Yes
Check the Main PCB;
RIC5(MC7812),PBD2
RR11 10Ω(1/2W)
Check the Power PCB;
Fuse P/T, PW1
Yes
No
No
Front PCB
Does UX1(6MHz)
oscillate ?
FRONT PCB PWR-SENS
voltage normal ?
(pin no. 11 ; 5V)
Check the Main PCB
RD4,RR19,RC13,RZD3
RC12,RR22,RR20
Yes
Front PCB
When the power is
ON 'H' displays
at pin no. 3 ?(5V)
Yes
Check the Main PCB
RQ7(C1008Y),RR9(22K)
RQ6(B1566), RR8(680Ω)
Replace µ-com.
Yes
No
No
No
Samsung Electronics 6-1
6. Troubleshooting
6-1 Amplifier
6-1-1 Power Malfunction
Page 2
6-1-2 No Output
Yes
AQ8L, 8R, 1L, 1R ?
Is Mute selected ?
Remove it with Remocon.
Main PCB AIC1
pin no. 1,8,16,17
B+,B- normal?
Check the B+,B- Power source
BPD1, RC7, RC8, RWA1
Check the Power PCB
Fuse, P/T, PW1
Yes
Check the Main PCB
AIC1, FIC2, FIC1
No
No
Yes
Check the Main PCB
AQ8L,8R,1L,1R
No
Headphone Jack short ?
Check Headphone jack
soldering condition.
Yes
No
UIC1(µ-COM) pin 5
Check the Front PCB
UIC1 (µ-COM).
Yes
No
Check the "H"?
Base B+?
6-2 Samsung Electronics
Troubleshooting
Page 3
6-1-3 Tuner Malfunction(FM/AM)
Main PCB
TZD1(7.5V), TZD2(5.1V)
Voltage normal?
TIC1 (LA1836)
Tuner BAND Switching ?
(pin 14)
Yes
Check the Main PCB
TZD1 (7.5V), TZD2 (5.1V)
TR38,TR53
No
Check the Main PCB
TIC2 (LC72131)
pin3,4,5,6
Check the Front PCB
UIC1 (µ-com)
No
Yes
TIC2 (LC72131)
VT Level Changeable?
(pin 20)
Check the Main PCB
TIC2 (LC72131) Oscillator
TX2 (7.2MHz)
No
Yes
TIC2 (LA1836)
If input normal ?
(pin 1,5)
Check the Main PCB
TFE1 (Front END Pack)
TL1 (MW/LW coil)
No
Yes
Check the Main PCB
FIC2 (TDA7439)
Function IC
Samsung Electronics 6-3
Troubleshooting
Page 4
6-1-4 Tape
Tape PCB
JIC3 (HA12203) B+, B-
Voltage normal?
No
Tape PCB
JIC3 (HA12203) pin2,4,39,41
Input signal normal?
No
Check the Tape PCB
DCW8, DCW9, JIC1,JIC2
Check the Main PCB
FIC2 (TDA7439)
Function IC
Yes
Tape PCB
JIC3 (HA12203) pin8,35
Output signal normal?
No
Check the Tape PCB
JIC3, JIC5
Yes
Yes
Check the Tape PCB
JZD1, JZD2, FZD2
6-4 Samsung Electronics
Troubleshooting
Page 5
6-3 CD
6-3-1 Revolution Malfunction
Yes
Check Deck down
Check CLOSE S/W voltage.
CLOSE condition: 0V
Check CLOSE MOTOR
and CLOSE S/W.
Does Roulette revolve ?
Check Roulette Motor.
Yes
Is Roulette Control ok ?
No
Check Roulette Control Sensor
Is Focus Search ok ?
No
Check oscillation of NXF100
(16.9344MHZ)
Does Laser function during
Focus Search ?
Replace PICK UP
Replace NIC9223 or NIC9258
Yes
POWER ON
Check UP/DOWN MOTOR
Replace NIC9286
Check NIC9286 pin73 voltage
during Focus Search
: 5V
No
Yes
Yes
No
No
Yes
Yes
No
No
Yes
Samsung Electronics 6-5
Troubleshooting
Page 6
6-6 Samsung Electronics
Troubleshooting
6-2-2 Audio Output Malfunction
Check voltage of NIC05 : 5V
No
Check waveform of NIC9223
pin no. 12,13
Check NIC9223 soldering
Check waveform of NC55R,L
Replace NIC9223
Check NIC9223 soldering
Yes
Replace NIC05
Check Amp
Malfunction of Audio Output
Yes
Yes
Yes
No
No
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