NAD T517AHT Service Manual page 24

ELECTRICAL TROUBLESHOOTING GUIDE
E
Normal
Audio output when
disc playback?
YES
Normal
IR.VFD & Front pannel
key functions?
YES
TEST END
Normal
NO
audio DAC
out?
Check audio filter,
amplify, mute circuit.
Commu-
nications between
NO
IR.VFD Front pannel
key & MT1389S is
normally?
NO Check the cable
connection on Front pannel.
3-11
NO
YES
NO
YES
Check the related
circuit of audio DAC.
Check communication
lines on MT1389S.