Hitachi 61HDX98B Manual page 27

DP-85 CHASSIS L.E.D. (VISUAL TROUBLE DETECTION) DIODES
(SUB POWER PWB) DIGITAL POWER SUPPLY 10 GREEN L.E.D.s and 1 RED L.E.D.
Audio
Audio
Center 21V
F/R 28V
R928
R927
D920
D919
D908 is a RED L.E.D.
Off = No I901 B+
On (Mid) = I901 B+
On (Bright) = Shutdown
D908
R919
(11 Total L.E.Ds. for visual trouble sensing observation)
TV 9V TV 5V +12VS
R9E3
R945
D930 D971
ALL GREEN L.E.D.s
Start Up or Run
Osc B+
24.2V
1.9V
Driver/Output IC
100% Dead Time &
7
IC B+ Detection
LNB Power
13V/19V +5VS
R939
R956
D928 D924
24.2V
R916
5
I901
1.9V
-5VS +3.3VS
R965 R966
D943 D962
Vcc
I905
4 1
3
2
I905 Shutdown
Photocoupler
12 Shut Down
Inputs
D3.3V
R972
R969
D947
D945
Q913
Shutdown
SCR