Page 1
6. Troubleshooting
6-1 Amplifier
6-1-1 Power Malfunction
Check voltage of XIC3
No
Check waveform of XIC1
pins 16,18,25,27
Check waveform of WIC41
pins 8,11,12
Yes
Replace XIC03
Malfunction of Audio Output
Yes
Yes
No
No
Check waveform of XIC2L,2R
pins 2,7
Check Amp operation
Yes
Yes
No
Check XIC1 soldering condition
Replace WIC41
Check WIC41 soldering condtion
Replace XIC2L,2R
Check XIC2L,2R soldering condition
Samsung Electronics 6-1
Page 2
6-1-2 FLT Malfunction
Connector inserted
correctly?
No
Check voltage : AC 5V
at FRONT-PCB FLT?
No
Check Main-PCB Front PCB
connection and the voltage of
RWA3, pins2,3(AC 5V)
Check voltage at FIC1
pin 54(-33V)
No
Check the voltage of RZD5(-30V)
Replace FIC1(LC75710)
Yes
Yes
Yes
Reinsert the connector
6-2 Samsung Electronics
Troubleshooting
Page 3
6-1-3 No Output
No
Check the AQ1L,1R
Base B+ ?
Is relay opened ?
Is mute selected ?
Yes
Replace relay
Check if the output line is
short.
Check the RWA4 TR(B1566)
out : -12V
No
Replace TR(B1566)
No
Main PCB RC1,RC2
(STK4181V) pins 12,14
B+,B- circuits
No
Check the Fuse
Check the Power-Trans
Yes
No
Replace Fuse
Main PCB µ-com pins 82,83
Check the "H"
Yes
Replace µ-com
Yes
Restore sound with remocon
No
Check for TR short
Replace it.
Yes
No
Yes
Yes
Samsung Electronics 6-3
Troubleshooting
Page 4
6-2-1 Power Malfunction
6-2 Cassette Deck
Main PCB µ-com VDD(5V)
normal?
UIC1 pins 18,47,90
Yes
Main PCB
Does UX2(12MHz)
oscillate ?
Yes
Check the FIC1(LC75710) :
pin 54 Vp(30V)
Replace µ-com
Yes
No
Main PCB POSNS
voltage normal ?
(pin 29 ; 4.5V)
Check the Main PCB :
DWA6
No
Main PCB RIC1(BA3950A)
OUT: pin 3(5V) output
voltage normal
No
No
No
Check the Main PCB
RZD5 : 30V
normal ?
Replace RZD5 30V
No
Replace FIC1(LC75710)
Yes
Replace µ-com
Yes
Fuse OK ?
No
Replace RIC1(BA3950A)
Yes
Replace Fuse
6-4 Samsung Electronics
Troubleshooting
Page 5
6-2-2 FLT Malfunction
Samsung Electronics 6-5
Troubleshooting
Connector inserted
correctly?
No
Check voltage : AC 5V
at FRONT-PCB FLT?
No
Check Main-PCB Front PCB
connection and the voltage of
RWA3, pins2,3(AC 5V)
Check voltage at FIC1
pin 54(-33V)
No
Check the voltage of RZD5(-30V)
Replace FIC1(LC75710)
Yes
Yes
Yes
Reinsert the connector
Page 6
6-2-3 No Output
No
Check the RIC1(BA3950A)
normal ?
Is relay opened ?
Is mute selected ?
Yes
Replace relay
Check the B-(RWA4 : B1566)
OUT : -12V
No
Replace TR(B1566)
Yes
Restore sound with remocon
No
Replace RIC1(BA3950A)
No
Check if the output line is
shorted.
No
Main PCB µ-com pins 82,83
Check for "H"
Yes
Replace µ-com
Yes
No
6-6 Samsung Electronics
Troubleshooting
Page 7
6-3 CD
6-3-1 Disc Revolution Malfunction
Power On and CD Function
Check disc sensor voltage
Is Focus search done properly?
Check oscillation of XX1
(33.8688MHz)
Yes
No
Yes
Yes
Yes
No
No
Replace Pick-up
Check WIC41 pin73 voltage
Replace WIC41
No
Yes
Replace NIC9220 or NIC9258
WCW4(SENI) condition
Does Laser function during
Focus Search ?
Check PC1,WQ91,92
during Focucs search : 5V
Samsung Electronics 6-7
Troubleshooting
Page 8
Check voltage of XIC3
No
Check waveform of XIC1
pins 16,18,25,27
Check waveform of WIC41
pins 8,11,12
Yes
Replace XIC03
Malfunction of Audio Output
Yes
Yes
No
No
Check waveform of XIC2L,2R
pins 2,7
Check Amp operation
Yes
Yes
No
Check XIC1 soldering condition
Replace WIC41
Check WIC41 soldering condtion
Replace XIC2L,2R
Check XIC2L,2R soldering condition
6-3-2 Audio Output Malfunction
6-8 Samsung Electronics
Troubleshooting
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