LC-42D64U/46D64U/52D64U
4 – 15
No monitor audio output
Is the audio output from the monitor set at "VARIABLE" or "FIXED"
on the menu screen?
NO Check the bus line (SCL0/SDA0) and IC1403.
YES
Are there the audio signal outputs at pins (24) (LINE_L) and (25)
(LINE_R) of IC1403 (CODEC)?
NO Check IC1403 and its peripheral circuits.
YES
Does the audio signal come from pins (24) (LINE_L) and (25)
(LINE_R) of IC1403 to pins (29) and (31) of SC2203 on the MAIN
unit?
NO
Check the line between IC1403 and SC2203.
YES
Are there the audio signal inputs at pins (29) (LINE_L) and (31)
(LINE_R) of SC501 on the TERMINAL unit?
NO Check the line between SC501 and SC2203 connectors.
YES
Does the audio come from pins (29) (LINE_L) and (31) (LINE_R) of
SC501 to pins (2) (L) and (4) (R) of J505?
NO Check the line between J505 and SC501, and their peripheral cir-
cuits.
Check the LINE_MUTE line and its peripheral circuits (Q507 thru
Q509, etc.).
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