Zenith DVB413 Service Manual page 18

E
Yes
Normal
Audio output
when disc playback?
Yes
Normal
IR. VFD & Front
panel key
functions?
Yes
TEST END
No
DAC received
correct data
stream?
Yes
Normal
Audio DAC
out? (IC601)
Yes
Check Audio filter, amplify, mute
circuit. (IC602 Application circuit)?
Communications
No
between IR.VFD Front panel key
& M3355 & Front u-com(IC901)
is normally?
Yes
Check the cable connection
on Front panel.
3-9
No
Check connection between M3355
& Audio DAC. (Check DAC_RST#,
SER3, BCLK, LRCK,MCLK
No Check the related circuit of
Audio DAC. (Check Audio
out Pin 14, 15,18,19)
No
Check communication lines
on M3355.