1-4 (No.XC045)
SECTION 2
TROUBLESHOOTING
2.1
Measuring instrument
• DC power supply (3V 500mA can be output.)
• Audio signal generator
• Vacuum Tube Volt Meter
• Oscilloscope
• DVD Player with optical digital output
2.2
About power supply
Please set the output voltage of the DC power supply to 3V, connect with SP1 and SP2 on the substrate as follows, and do the con-
firmation work.
SP1: The plus output of the DC power supply is connected.
SP2: Ground of the DC power supply is connected.
2.3
Analog signal input level
500mVrms
2.4
YES
→
Normal
NO
→
The voltage and the waves are abnormal.
2.5
Check method
C26
C45
C46
C50
C51
C54
C66
C67
C69
C70
C71
C78
C85
C86
D1
D2
D3
D4
D5
D6
D7
D8
D9
D10
D11
F1
IC4
IC8
IC9
IC11
J1
J4
Q1
Q2
Q3
R2
R3
R4
R5
R22
R23
R24
R26
R27
R28
R29
R30
R31
R32
R33
R34
R35
R36
R37
R40
R41
R43
R44
R45
R46
R69
R85
SW1
SW2
SW3
SW4
X1
K6
R90
C91
C92
C93
R95
C151
C152
K15
Q4
Q5
F2
SP1
SP2
Symptom
Check point
Voltage and waves when
it is normal
Check part and breakdown parts
The power supply is not
turned on.
1
Both sides of F2
DC approx. 0V
NO
→
Defect of F2
YES
→
check of 2
2
IC1 8pin
DC approx. 3.3V
NO
→
Defect of IC1
YES
→
check of 3
3
IC6 4pin
DC approx. 1.3V
NO
→
Defect of IC6
YES
→
check of 4
4
IC5 1pin
DC approx. 3.3V
NO
→
Defect of IC5
YES
→
check of 5
5
IC8 10pin
f=10MHz
NO
→
Defect of IC8 or Check on circuit in
surrounding.
YES
→
check of 6
6
IC8 7pin
DC approx. 3.3V
NO
→
Defect of IC8 or Check on circuit in
surrounding.
YES
→
check of 7
7
IC7 3pin
f=12.288MHz
NO
→
Defect of IC7 or Check on circuit in
surrounding.
YES
→
Defect of IC2 or Check on circuit in
surrounding.
