Pioneer KRL-46V Service Manual page 40

1
A
The audio signal of UHF/VHF and DTV is not output from INPUT1 (SCART).
TEREMINAL UNIT:
Is audio signal sent to pins (3/L-ch) and (1/R-ch) of SCART1
(SC502)?
Is S-MUTE-LINE [MAIN_UNIT pin (93) of IC9101 (CPLD)] at H?
B
Is audio signal sent to pins (24/L-ch) and (22/R-ch) of IC1402
(SOUND MULTIPLEX DECODER)?
Check IC1402 and its peripheral circuits.
The audio signal of UHF/VHF and DTV is not output from INPUT2 (SCART).
C
TEREMINAL UNIT:
Is audio signal sent to pins (3/L-ch) and (1/R-ch) of SCART2
(SC503)?
Is S2-MUTE-LINE [MAIN_UNIT pin (91) of IC9101 (CPLD)] at H?
Is audio signal sent to pins (3/L-ch) and (13/R-ch) of IC7510
D
(SW)?
Is audio signal input to pins (2/L-ch) and (15/R-ch) of IC7510?
Is audio signal sent to pins (24/L-ch) and (22/R-ch) of IC1402
(SOUND MULTIPLEX DECODER)?
E
Check IC1402 and its peripheral circuits.
F
40
1
2
The audio signal is not output (1)
NO
NO
NO
The audio signal is not output (2)
NO
NO
NO
NO
NO
KRL-46V
2
3
YES Check the connection to SCART1 and external devices.
YES Check the peripheral circuits of IC9101 and S-MUTE_LINE.
(Q502, Q504, etc.)
YES Check the line between SC502 and IC1402.
(Q508, Q507, IC1407, etc.)
YES Check the connection to SCART2 and external devices.
YES Check the peripheral circuits of IC9101 and S2-MUTE_LINE.
(Q501, Q503, etc.)
YES Check the line between IC7510 and SC503.
(Q506, Q505, etc.)
YES Check IC7510 or peripheral circuits.
(SC_AUD_SEL_LINE, etc.)
YES Check the line between IC7510 and IC1402.
(IC1407, etc.)
3
4
4