NAD T515C Service Manual page 20

E
Normal Audio output
when disc playback?
YES
Normal IR.VFD & Front
panel key functions?
YES
TEST END
NO
Audio DAC received
correct data stream?
Normal Audio DAC out?
Check Audio filter, amplify,
mute circuit.
Communications between
NO
IR.VFD Front panel key &
ZR36888 is normally?
Check the cable connection
on Front panel.
3-9
NO
YES
NO
YES
NO
YES
Check connection between
ZR36888 & Audio DAC.
Check the related circuit of
Audio DAC.
Check communication lines
on ZR36888