6. There is no sound from Optical and Coax input.
DIGITAL PCB [N8302]
Check the 1 pin 3 pin speech waveform.
Check the voltage of DIGITAL PCB [BN300].
1pin +3.3V 3pin +5V
Check DIGITAL PCB [IC301] digital audio
input.
32pin(opt1), 33pin(opt2), 35pin(coax)
DIGITAL PCB [IC301]
20pin SCKO, 19pin BCK
18pin LRCK, 17pin Dout
DIGITAL PCB [IC300]
Check 19, 20, 23, 24 pin output waveform.
Check DIGITAL PCB [BN301] and cable for
faults, and proceed to 5. if there are no prob-
lems
Repair faults in DIGITAL PCB [BN300] and
cable
MAIN PCB
Repair faults [U8301](+3.3V) and [U8304]
(+5V).
Check DIGITAL PCB [JK300] (opt1), JK302
(opt2) and [IC303] (coax) for faults, and repair
them.
Check [IC301] solder and surrounding circuits.
Check [IC300] solder and surrounding circuits,
and repair any faults.
OK
OK
OK
OK
33
Caution in
servicing
Electrical Mechanical Repair Information Updating
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