Samsung NA-C10 User manual
PC AUDIO
NA-C10/CP50/CP70
MCD-M500(N)/M530(N)
SERVICE Manual
PC AUDIO CONTENTS
Charge
On/Standby
Auto Door Open
Function Open/Close
CD
CD/Tuning
Volume
Power
Sound
Power
Surround
Game
Sound Band
Preset
EQ Timer
On/Off
Timer/
Clock
Sleep
PTY Display
A B Mono/ST
PROG./Set
Phones
Tuning
Mode
RDS
Repeat CD
1. Alignment and Adjustments
2. Exploded Views and Parts List
3. Electrical Parts List
4. Block Diagrams
5. PCB Diagrams
6. Wiring Diagram
7. Schematic Diagrams
8. TROUBLESHOOTING
On/Standby
Auto Door Open
Function Open/Close
CD/MP3
CD/MP3/Tuning
Volume
Power
Sound
Power
Surround
Game
Sound Band
Preset
EQ Timer
On/Off
Timer/
Clock
CD RandomSleep Mute
1/All (A B)
Mono/ST
PROG./Set
MICPhones
Tuning
Mode
Repeat
Charge
HeadphoneVolumeLineOutSBSHold
Open
Play/pause
Stop
F/Skip
B/Skip
Mode ESP
Remain
ELECTRONICS
© Samsung Electronics Co.,Ltd. SEP. 2000
Printed in Korea
Code no. AH68-00073X
OUTPUT
AM SSG
450KHZ
INPUT
AM ANT
IN
Speaker Terminal
60cm
TFT1
VTVM Oscilloscope
1. Alignment and Adjustments
1-1 Tuner
Samsung Electronics 1-1
FM THD Adjustment
Output
Output 1kHz 28dB
60 dB
Minumum Distortion (0.3% below)
(Figure 1-1)
SSG FREQ.
Adjustment
point
(TFT2)
98 MHz
FM DETECTOR COIL
AM(MW) I.F Adjustment
Maximum output (Figure 1-3)
SSG FREQ.
Frequency
Adjustment
point
(TFT1)
450 kHz
522 kHz
AM I.F COIL
FM Search Level Adjustment
Adjust IVR1 so that “TUNED” of FLT is
lighted (Figure 1-2)
4Gag : 20dB(CE standard)
Figure1-2 FM Auto Search Level Adjustment
Figure1-3 AM I.F Adjustment
Figure1-1 IF CENTER and THD Adjustment
SSG FREQ.
Adjustment
point
(TVR1)
98 MHz
BEACON
SENSITIVITY
SEMI-VR(20KΩ)FM SSG GND
28 dB
FM SSG
Output
GND
Speaker
Terminal
FM
Antenna
Terminal
Distortion Meter
Input
SET
Input
output
Oscilloscope
FM IN
FM Antenna
SET
TVR1
20KHz
* When adjusting T.H.D., readjust I/F coil on the Tuner Pack.
OUTPUT
8. Troubleshooting
8-1 Power Malfunction
Main PCB µ-com VDD(5V)
normal?
UIC1 pin no. 18,47,90
Top PCB ARIC1(K7805) IN: 10V
Input voltage normal?
Main PCB PWR-SENS
voltage normal ?
(pin no. 27;5V)
Main PCB
Does UX1(6MHz)
oscillate?
Main PCB
When the power is
ON 'H' displays
at pin no. 5 ?(5V)
Replace ARIC1
Check the Power PCB ;
ARD 1, 2, 3, 4 (IN5392)
AF2 (1.25A Fuse)
Connect Top PCB and Main PCB.
Check the connector Main PCB.
Wafer ucw3
No No
Check the Main PCB
ARZD1, ARR 7, ARR6
ARD5, ARC5, 12
No
No
No
No
Yes
Yes
Yes
Yes
Replace µ-com.
Check the Power PCB : P/T, FUSE
Yes
Samsung Electronics 8-1
Samsung Electronics
Troubleshooting
8-2
8-2 No Output
Main PCB AIC1
pin no. 9,4,12,8
B+,B- circuits
AQ 7,8 Base B+ ?
Is Mute selected ?
Check the B+ power PCB
AD1,2,3,4, AF1,3
Confirm for TR short
replace it.
Remove it with Remocon.
Replace Headphone jack
soldering condition.
No
No
No
No
Check if the output line is
short.
Yes
Yes
Yes
Yes
Headphone Jack short ?
Samsung Electronics
Troubleshooting
8-3
8-3 Tuner Malfunction (FM/AM)
TZD2(8.2V) Voltage ok ?
Check TUNER IC(LA1836)
pin on. 10 ; 8.2V
pin on. 14 ; 7.2V
AM ; 0V ?
FM VT
LC72131 pin no.20
1.7V 7.5V
Power section defective
Check for µ-com IC
Replace LC72131
Check FEP interior
pattern, and any line
disconnections.
No
No
No No
No
No No
Yes
No
No
Yes No
No
Yes
Yes
Yes
Yes
Check MIC6
pin 20 ?
LPF1,2
output ok ?
Yes
AM VT
LC72131 pin 20
0.9V 7V ?
AQI(C4369) Voltage ok ?
PIN NO.8 : 12V
Check the voltage ok ?
TZD3(5.6V) Voltage ok ?
MIC7(LC72131) FM/AM BAND
Switching ok ?
1) Power impaired
so repair defects.
2) LC72131 Oscillator
(HX1 : 7.2MHz) ok ?
3) System line ok ?
LC72131
CONTROL ok ?
Check the LC72131
CONTROL ok ?
Check(TDA7449) function ok ?
QIC1
Connector inserted
correctly ?
(DI, CL, CE, +5V)
Check voltage DC5.0V
at LCD-PCB ?
Check voltage at ZIC1
pin no. 56,57,58
Reinsert the connector.
Check TOP-PCB ,LCD PCB
connection and the voltage of
ZCW1(6pin)
Check the voltage of ARIC1
Replace ZIC1
No
No
No
Yes
Yes
Yes
Samsung Electronics8-4
8-4 LCD Nalfunction
Troubleshooting
Check main PCB µ-com
connector pin No.
6,7,8,99
Check Top PCB
CCW1 79, JACK PCB 9P
Check Main PCB
µ-com Pin No. 86
LOW : YES
Check CD B+
CQ1, ARQ5
Check the Top PCB
CCW4, CCW1, JACK PCB
MY CD
No No
Check the Leaf S/W
No
Check the Top PCB
ARQ1, ARZD1
No
6 : Data 8 : ACK
7 : CLK 99 : RZQ
Yes
Yes
Yes
Yes
Samsung Electronics 8-5
8-5 CD Malfunction
Troubleshooting
Samsung Electronics8-6
8-6 MP3 Malfunction
Check main PCB µ-com
Pin No : 6,7
Check main PCB µ-com
Pin No : 85
Low : YES
Check MP3 B+ BQ3,
Check Top PCB
ANIC3 Pin No : 3,4,6,20
GIC2 Pin No : 6,7,8
ARIC2 (KA7805)
Check the Leaf S/W GCW2
Check Top PCB
BA50, 51, 52, BR8,BF1
Change MP3
No
No
No
Yes
Yes
Yes
Troubleshooting
Samsung Electronics 8-7
8-7 MCD Part
Troubleshooting
DOES LCD TURN ON
IS CD LSI VCC=3V
DOES SLED MOVE TO INNER
IS FOCUS SEARCH DONE
PROPERLY
PLAY KEY INPUT
CHECK IC 2020 PIN NO 5, Q106 Collector(3V)
CHECK MICOM VCC(IC 9533 outpout) : 3.3V
CHECK HOLD SW/DOOR SW : HOLD SW "L"
DOOR SW "L"
CHECK CON11, CON12, CONNECTION
CHECK MICOM RESET "L" "H" PIN NO 25 KEY input
(When press the play Button)
No
CHECK IC 7327 PIN NO 55 "F0"
CHECK IC 6509 PIN NO 40, 3, 5
CON101 CONNECTION
No
No
No
Yes
Yes
Yes
Yes
CHECK IC 6509 PIN NO 14("L"), 22("L")
CHECK IC 7327/ IC6509 VCC/CON102 CONNECTION
CHECK IC 7327 PIN NO 15, 16 Resonator Signal(16.93Mhz)
CHECK MICOM COMMAND PORT, PIN NO 38, 39, 40, 41, 42
CHECK IC 7327 PIN NO 56 "Ω"Port/ IC 6509 PIN NO37
CHECK THE LIMIT SWITCH IC 7327 PIN NO 63, 29, 31
NEXT PAGE
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