Sharp DV-740/T, Service Manual

Page: 10 / 90

DV-740/X/W/T
10
Sound does not operate normally.
Set the disc on the disc tray.
Are the digital signals inputted to the
pins of audio D/A convert U12?
U12 PIN2 SDATA
U12 PIN3 SCLK
U12 PIN4 LRCK
U12 PIN5 MCLK
Is the setup menu “AUDIO OUTPUT” set
correct?
YES
YES
Set it correct.
NO
NO
Replace U12.
YES
Check U1.
Are the analog audio signals outputted to
the amplifiers?
U12 PIN12 AOUTL
U12 PIN16 AOUTR
Make sure the mute
pin is “L” level.
U12 PIN16 MUTEC
NO
YES
Are the L/R analog audio signals outputted
to the specific output terminal?
P3 2PIN LEFT OUT
P3 3PIN RIGHT OUT
YES
Check the audio amplifiers
U16 and peripheral circuit
and make sure it works
normally.
NO
Check U1.
NO
Check the audio mute circuit
works normally.
YES
NO
Check
the
connect
circuit.