Check the PC I/F unit.
<When COMPONENT/RGB signal is received> No image (5)
No RGB image on INPUT1
Has "INPUT1" been selected
on the Input Select screen?
Are RGB signals applied to
pins (63), (59) and (61) of
IC1401 (AV switch)?
Select INPUT1 RGB on
the Input Select screen.
Check lines and devices
between pins (15), (11), (7) of
SC1101 (INPUT1) and pins
(63)
,
(59)
,
(61) of IC1301.
No RGB image on INPUT3
Has "INPUT3" been selected
on the Input Select screen?
NO
NO
YES
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
NO
NO
NO
YES
YES
NO
NO
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
YES
Select INPUT3 RGB on the
Input Select screen.
Are RGB signals applied to
pins (9), (5) and (7) of
IC1401 (AV switch)?
Check lines and devices
between pins (15), (11), (7)
of (SC1102) INPUT3 and
pins (9), (5), (7) of IC1301.
No COMPONENT image on INPUT3
Has "INPUT3" been
selected on the Input Select
screen?
Select INPUT3
COMPONENT on the Input
Select screen.
Are RGB signals applied to
pins (5), (17) and (19) of
IC1401 (AV switch)?
Check lines and devices
between pins (8), (26), (17)
of J1101 (INPUT3) and pins
(15), (17), (19) of IC1301.
Are the MAIN video signal sent from (46)/(50)/(48), PASS signal sent from (34)/(38)/(36) and SUB video signal sent from pins (4
0)/(44)/(42) of IC1401 respectively?
Are Y/Cb/Cr signals applied to pins
(19), (18) and (17) of IC801 (MAIN
VIDEO CHROMA) respectively?
<MAIN 525i system>
<PASS 525P/1125i/750P system>
Check lines and devices between
pins (46), (50), (48) of IC1401
and pins (19), (18), (17) of IC801.
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 respectively?
Check lines and devices
between IC801 and IC803.
(IC814, Q814-5, etc.)
Are Y/Cb/Cr signals applied to
pins (5), (4) and (3) of IC803
(RGB decoder) respectively?
Check lines and devices between
pins (34), (38), (36) of IC1401
and pins (5), (4), (3) of IC803.
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?
Check lines and devices
between IC803 and FL810.
(Q801-3 etc.)
Are the MAIN-R/G/B signals
sent from pins (19), (15) and
(12) of FL810 respectively?
The cutoff frequency of FL810
(L.P.F.) is switched as follows
depending on the input
signals:
Status of pin (17) for setting the
cutoff frequency of FL810 (6.7/30
MHz L.P.F.)
<525i system>: High
<525P/1125i/750P system>: Low
Check FL810 (6.7/30 MHz L.P.F.)
and its peripheral circuits.
<SUB system>
Are Y/Cb/Cr signals applied
to pins (19), (18) and (17)
of IC802 (SUB VIDEO
CHROMA) respectively?
Check IC1401 (AV switch)
and its peripheral circuits.
Check lines and devices
between pins (40), (44), (42)
of IC1401 and pins (19), (18),
(17) of IC802.
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/Q905-6 (6.7 MHz
L.P.F.).
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