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- 3-8 -
Normal IR.VFD & Front
pannel key functions?
Communications between
IR.VFD Front pannelkey & MT1389
is normally?
Check communication lines on
MT1389.
NO
YES
Check the cable connection on
Front pannel.
TEST END
YES
Normal Audio output
when disc playback?
Audio PWM IC received
correct data stream?
Check connection between MT1379
& Audio PWM IC.
Normal Audio PWM IC
out?
Check the related
circuit of Audio PWM IC.
Check Audio filter,amplify,mute
circuit.
NO NO
NO
YES
YES
YES
E
NO
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