BBK DV718SI - Page 44

3. Troubleshooting process for “No sound output” is shown in the figure 3.2.2.3:
No sound output
Whether
+9V, -9V power supply
is normal
Check power supply circuit
N
Y
Whether
decode chip has audio
signal output
Check decode chip
N
Y
Whether
Q213 collector electrode
is low level
Check mute circuit
N
Y
Check according to troubleshooting
of "Single channel has no sound"
Figure 3.2.2.3 Troubleshooting flow chart for “No sound output”
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