(A),(C),(E),(G) (B),(D),(F)
<When video signal is received> Are the MAIN video signal and SUB video signal sent from pin (56) and pin (44) of IC1301 respec
tively?
<When Y/C signal is received> Are the MAIN-Y signal, MAIN-C signal, SUB-Y signal and SUB-C signal sent from pin (56), pin (58),
pin (44) and pin
(47) of IC1301 respectively?
Check IC1301 (AV switch) and its peripheral
circuits.
<When video signal is received> Is the video signal applied to pin (7) of IC401 (MAIN COMB FILTER) and pin (7) of IC402 (SUB CO
MB FILTER)?
<When Y/C signal is received> Are the MAIN signal and SUB signal applied to pins (44) and (43) of IC801 (MAIN VIDEO CHROMA) and
pins (5) and
(7) of IC802 (SUB VIDEO CHROMA) respectively?
Check lines and devices between IC1301
and IC401/IC402/IC801/IC802.
<Main system>
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
<When video signal is received>
Are the MAIN-Y signal and MAIN-C signal
applied to pin (1) (TP812) and pin (48) of
IC801 (MAIN VIDEO CHROMA)
respectively?
<When video signal is received>
Check lines and devices between IC4001
and IC801.
(IC403, Q415, etc.)
<When Y/C signal is received>
Are the MAIN-Y signal and MAIN-C signal
applied to pin (44) and pin (43) of IC801
(MAIN VIDEO CHROMA) respectively?
<When Y/C signal is received>
Check lines and devices between IC1301
and IC801.
(Q827, Q403, Q404, etc.)
Are the MAIN-Y/Cb/Cr signals sent from
pins (21), (22) and (23) of IC801
respectively?
Check IC801 (MAIN VIDEO CHROMA) and
its peripheral circuits.
Are the MAIN-Y/Cb/Cr signals applied to pins (69), (68)
and (67) of IC803 (RGB DECODER) respectively?
Check lines and devices between IC801
and IC803. (IC814, Q814, Q815, etc.)
Are the MAIN-R/G/B signals sent from pins
(35), (37) and (39) of IC803 respectively?
Check IC803 (RGB DECODER) and its
peripheral circuits.
Are the MAIN-R/G/B signals applied to pins
(3), (7) and (10) of FL810 (6.7/30 MHz
L.P.F.) respectively?
Are the MAIN-R/G/B signals sent from pins
(19), (15) and (12) of FL810 respectively?
Check lines and devices between IC803
and FL810.(Q801-3 etc.)
Is cutoff frequency setting pin (17) of FL810
(6.7/30 MHz L.P.F.) pulled high?
Check FL810 (6.7/30 MHz L.P.F.) and its
peripheral circuits.
Check the PC I/F unit.
<Sub system>
<When video signal is received>
Are the SUB-Y signal and SUB-C signal
applied to pin (1) and pin (48) of IC802
(SUB VIDEO CHROMA) respectively?
<When video signal is received>
Check lines and devices between IC402
and IC802.
(IC404, Q416-8, etc.)
<When Y/C signal is received>
Are the SUB-Y signal and SUB-C signal
applied to pin (5) and pin (7) of IC802
(SUB VIDEO CHROMA) respectively?
<When Y/C signal is received>
Check lines and devices between IC1301
and IC802.
(Q828, Q409, Q410, etc.)
Are the SUB-Y/Cb/Cr signals sent from pins
(21), (22) and (23) of IC802 respectively?
Check IC802 (SUB VIDEO CHROMA) and
its peripheral circuits.
Are the
SUB-Y/Cb/Cr
signals applied to
Q901-2, Q903-4 and Q905-6 (6.7 MHz
L.P.F.) respectively?
Check lines and devices between IC802
and Q901-2/Q903-4/Q905-6 (6.7 MHz
L.P.F.).
Are the SUB-R/G/B signals sent from Q901-
2, Q903-4 and Q905-6 (6.7 MHz L.P.F.)
respectively?
Check peripherals of Q901-2, Q903-4 and
Q905-6 (6.7 MHz L.P.F.).
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