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1
A
No sound output in all modes?
TEREMINAL UNIT:
Is the audio signal output of pins (38) (L-ch) and (39) (R-ch) of
IC1404 (CODEC) normal?
Is audio signal input to pin (5/L), pin (9/R) of IC1301 (AMP)?
B
Is MUTE circuit [SP_MUTE_LINE, S_STBY_LINE] normal?
Is the audio signal output of pins (2, 1) (L-ch) and (3, 4) (R-ch) of
P1301(AOUDIO-CONNECTOR) normal?
Check Speaker Box (right and left) and wire harness.
C
Does not the sound go out though the picture has come out when UHF/VHF is received?
TEREMINAL UNIT:
Is the IF signal output from pin (17) of TUNER (TU7501)?
Is the SIF signal sent to pins (23) and (24) of IC7504 (IFDE-
D
MOD)?
Is the SIF signal input from pin (12) of IC7504 to pin (3) of IC1402
(SOUND MULTIPLEX DECODER)?
Is audio signal input from pin (24/L-ch), (22/R-ch) of IC1402 to
pin (61, 62) of IC1404 (CODEC)?
E
Refer to "No sound output in all modes".
F
36
1
2
The sound is not emitted from the speaker though the picture has come out.
YES
YES
YES
YES
No sound (during the reception of TV(ANALOG) broadcasting)
YES
YES
YES
YES
2
3
NO
Check IC1404 and its peripheral circuits.
NO
Check the line between IC1404 and IC1301.
NO
Check the SP_MUTE_LINE and S_STBY_LINE.
(Q1302, etc.)
NO
Check IC1301 and its peripheral circuits.
NO
Check the tuner and its peripheral circuits.
Replace as required.
NO
Check FL7501 and its peripheral circuits.
NO
Check the line between IC7504 and IC1402.
(Q7504, etc.)
NO
Check the line between IC1402 and IC1404.
KRL-46V
3
4
4
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