47
DV-NC70/W
DV-NC70X/RU
FLOW CHART NO.23: Hi-Fi SOUND MODE TROUBLESHOOTING (1)
NO
Check line ranging from pins (7), (11) of SC1701,
to the each input terminal of IC651.
L-ch
R-ch
Tuner input terminal
Front A/V input terminal
YES
YES
NO
NO
NO
L1 input terminal
Check line ranging from front audio input terminal
(J8002 and J8003), to the each input terminal of
IC651.
Check PC 5V and PC 9V lines.
NO
NO
YES
Is there audio signal inputted at each input
terminal of IC651 as shown in table?
pin(13)
pin(8)
pin(15)
pin(4)
pin(10)
pin(14)
DVD audio
pin(2)
pin(9)
Is there audio signal outputted at pins (57) and
(53) of IC651?
Line output terminal: Is there audio signal outputted at pins (57) and (53) of IC651?
RF output terminal: Is there audio signal outputted at pin(59) of IC651?
Line output terminal:
Check line ranging from pins (57) and (53) of IC651 to the audio output terminal.
RF output terminal:
Check line ranging from pin(59) of IC651 to the audio input terminal at pin(2) of tuner (TU101).
Is the supply voltage of 5V fed to pins (25), (40)
and 9V fed to pin(58) of IC651?
Are there serial data and clock at pins (43) and
(42) of IC651?
Check line between pins (43), (42) of IC651 and
pins (18), (17) of IC701.
Check line ranging from rear audio input terminal
(J1202), to the each input terminal of IC651.
<For Hi-Fi mode>
No Hi-Fi E-E sound heard.
U/V tuner audio input terminal
YES
NO
NO
NO
Normal audio input terminal
Check line ranging from pin(21) of TU101.
Is there audio signal inputted at each input
terminal of IC201 as shown in table?
pin(9)
pin(8)
Is there audio signal outputted at pin(11) of
IC201?
Check line between pin(36) of IC651 and
pin(81) of IC701.
Check line ranging from pin(61) of IC651.
<For normal audio
mode>
YES
NO
Is there audio signal inputted at pin(62) of
IC651?
Check line between pin(11) of IC201 and
pin(62) of IC651.
Check line between pin(36) of IC651 and
pin(81) of IC701.
Is there "L" level at pin(36) of IC651?
Replace IC651.
YES
YES
NO
NO
YES