Page 1
TROUBLESHOOTING GUIDE
1. POWER PART
Turn power on.
PN302 5.6V check?
PN302 Defective.
IC703 Surrounding circuitry
defective.
IC703 defective.
IC301 defective.
IC801 defective.
IC301 defective.
•
PN808 defective.
•
Pattern defective.
•
X301 defective.
•
IC301 defective.
IC301 16, 46, 72, 90 input +5V
IC703 check?
• Pin 1 + 12V
• Pin 3 + 6.3V
IC301 Pin 79 power output?
IC301 Pin 97 HRST output?
IC801 Pin 13,15,17,4 Check?
IC301 Pin 12 Reset check.
OK
IC301 Pin 98,99,100,97 Check?
- 10 -
OFF
ON 5V
PCTL
HRST
13
15
98
99
100
97
17
4
NO NO
NO
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
YES
YES
YES
YES
Page 2
- 11 -
2. CD PART
DOOR OPEN/CLOSE
CHECK? (LOADING)
Is rotate turret?
(A) When laser does not light.
(B) When laser lights.
Is DISC play?
Is lead-in?
Is audio output?
2-1
2-2
2-3
2-4
2-5
Page 3
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2-1. DOOR OPEN/CLOSE PART(LOADING)
Door open/close?
IC809 Pin 2, 10 Output?
• ZD803 defective.
• +12V-CD defective.
•
IC809 defective.
•
2,10 pattern defective.
Pick-up MOTOR? Pick-up defective.
OK
• CLOSE leaf s/w defective.
• IC801 Pin 2, 3 defective.
• ZD803 (4.7V)?
• IC809 surrounding circuitry
check?
IC809 Pin 5,6 input?
56
OPEN L H
CLOSE H L
NO
NO
NO
NO
YES
YES
YES
YES
Page 4
- 13 -
2-2. TURRET PART
OK
Is Rotation turret?
Limit S/W 0V(LOW) check?
IC801 Pin 47, 51, 93, 94 check?
IC808 Pin 15, 16, output check?
PN802 input check?
Pick-up check?
Pick-up defective.
IC808 Pin 11, 12 output
pattern defective.
PN805 connector check.
IC801 DATA, CLK, XLT check?
IC801 defective.
•
IC801 Pin 20, 21, 23
Pattern defective.
•
IC827 defective.
•
IC827 X-TAL Pin 8, 9
defective.
IC827 36, 37, 38 check?
IC806 Pin 43 output check?
IC808 Pin 11, 12 output check?
• IC808 Pin 10 pattern
defective.
• IC806 defective.
Down leaf S/W(PN804) 0V
(LOW) check?
leaf S/W defective.
• IC801 defective.
• IC801 Pin 47, 51, 93,
94 pattern defective.
• IC806 Pin 35, 36, 37
input defective.
• IC806 defective.
• IC808 defective.
• IC808 Pin 9, 14 input
defective.
• IC808 Pin 15, 16,
output defective.
NO NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
Page 5
- 14 -
2-3. DISC PLAY PART(A, B)
(A) When laser does not light.
IC806 Pin 72 2.8V(LD) check?
•
IC806 defective.
•
IC806 Pin 71 defective.
•
Q801 defective.
•
R833 defective.
PN801 defective.
Pick-up defective.
Q801 Collector 2.0V?
PN801 check?
Pick-up lens check?
OK
NO
NO
NO
NO
YES
YES
YES
YES
YES
Page 6
- 15 -
(B) When laser lights
(C)
Does the lens move up and
down?
IC806 Pin 48 output (FEO)?
•
IC806 defective.
•
C811 defective.
•
IC806 Pin 25 input
defective.
•
IC806 defective.
•
PN801 defective.
•
Pick-up defective.
IC806 Pin 26, 27 output
check?
IC806 Pin 79 RFO output?
Q801 defective.
NO NO
NO
NO
YES
YES
YES
YES
Page 7
- 16 -
(C)
The wavefrom of IC806 Pin
79 is below figure?
IC806 “FOK” signal output?
(Pin 40 check?)
IC801 Pin 81 FOK input check?
IC806 “FEO” output? (Pin 48)
IC827 FZC and SENS
output check?
IC827 SMDP signal output?
Pin 75 check?
IC808 disc MOTOR output 17,
18 check?
• Pick-up defective.
• PN802 defective.
• Turntable height error.
• Laser diode degraded.
• IC801 Pin 81 defective.
• IC806 defective.
• IC808 defective.
• IC808 Surrounding
circuitry defective.
• Pin 75 pattern defective.
• X802 defective.
• IC827 defective.
• IC806 defective.
• IC806 Pin 78, 79, 80, 3, 4
defective.
• IC806 defective.
• PN801 connector defective.
• Pick-up defective.
NO
NO
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
YES
YES
Page 8
- 17 -
Is leas-in?
IC827 Pin 66 EFM check?
IC806 defective.
IC801 defective.
IC801 Pin 16 SQCK check?
IC827 defective.
IC801 defective.
•
IC827 Pin 25 pattern
defective.
•
IC827 defective.
IC801 Pin 14 input check?
IC827 Pin 25 “GFS” input?
IC801 Pin 88 SCOR check?
OK
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
2-4. Is Lead-in
Page 9
- 18 -
2-5. Audio signal KARAOKE AND VCD(A, B)
(A) KARAOKE AUDIO.
IC829 Pin 49 input check?
IC814 Pin 107, 108, 109
output?
IC814 defective.
IC825 Pin 14, 16 output?
RESET surrounding circuitry
defective.
OK
defective.
IC824 Pin 1 input check?
IC824 Pin 3, 6, 10 input
check?
IC825 Pin 1, 2, 3 input check?
IC825 defective.
IC801 defective.
IC829 defective.
IC824 defective.
IC830 DATA LINE ADRS LINE
check?
IC825 defective.
IC829 Pin 17 RESET check?
•
IC801 defective.
•
IC801 Pin 52 defective.
(B) VCD AUDIO.
OFF
VCD
ON
KARAOKE
NO
NO
NO
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
YES
YES
YES
Page 10
- 19 -
3. VIDEO PART
5V
PICTURE DEFECTIVE.
PICTURE DEFECTIVE.
IC803 Pin 8 check?
IC814 defective.
IC828 Pin 52 “RSTB” check?
IC828 “RGB” input check?
IC828 defective.
OK
COLOR DEFECTIVE.
3-1
3-1
3-2
•
IC801 defective.
•
IC803 defective.
YES
YES
NO
NO
NO
Page 11
- 20 -
COLOR DEFECTIVE.
3-2
5V
R882 defective.
IC828 defective.
OK
R882 check?
R882
NO
YES
Page 12
- 21 -
WAVEFORMS OF MAJOR CHECK POINT
1. HF signal (RF signal ) waveform
(Test Point PN809) during normal play
2. EFM signal (pin31 of IC 806)waveform
during Normal Play
3. Focus coil drive waveform(Pin NO 1, 2 of IC 808)
●
When focus search failed or there is no disc on the tray
●
Focus coil drive waveform(pin NO 1, 2 of IC808) and
FOK (pin NO 40 of IC 806)
when focus search is accomplished
4. Tracking coil drive waveform (pin NO 25 of IC 808) and
TEO during track traverse
(1) When time division is 20nS/div
(2) When time division 0.5nS/div.
(During forward track traverse)
(3) When time division is 0.5nS/div.
(During backward Track Traverse)
5. Feed motor drive waveform(pin NO 10 of IC 808)
During normal play
CH1 : FOCUS COIL DRIVE
SIGNAL 2V/Div.
CH2 : FOAK
CH1 : TEO(TP801)
1V/Div.
CH2 : TRACKING COIL DRIVE
SIGNAL 2V/Div.
[
[
[
CH1 : TEO(TP801)
1V/Div.
CH2 : TRACKING COIL DRIVE
SIGNAL 2V/Div.
[
CH1 : TEO(TP801)
1V/Div.
CH2 : TRACK COIL DRIVE
SIGNAL 2V/Div.
[
0.5V/Div.
500nS/Div.
[
2V/Div.
500nS/Div.
[
0.5V/Div.
500nS/Div.
OV
OV
OV
(CH1)
(CH2)
(CH1)
(CH2)
(CH1)
(CH2)
(CH2)
OV
OV
OV
OV
OV
OV
OV
OV
OV
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