Hitachi 61HDX98B Manual page 26

DP-85 DIGITAL CIRCUIT POWER SUPPLY SHUTDOWN DIAGRAM
I901
ShutDown Pin (7)
on Power Supply
Driver &
Output IC
5
Run B+
R907
D905
R908
No Start Up B+ = Off
Normal = Glowing
D964
Blinks during Shutdown because
of the internal current draw.
15.1V ~ 22.5V pin 5 I901
1/2 AC In
Start Up B+
NOTE: +12VS is the same as A12V and STBY12V
R975
-5VS
R976
+5VS
TV 5V Too Hi Det.
TV 9V Too Hi Det.
D3.3V Too Hi Det.
DIGITAL & SIGNAL
POWER SUPPLY SHUT-DOWN
Active High
7 3
D908
Red LED
Shut Down
Identification
R919
-5V Loss Det.
D952 D953
D974
+5V
D975
+9V
D938
D3.3V
I905
2
Photocoupler
Q917
Off
STBY +12V
Off
D934
+3.3Vs
D933
+5Vs
D936
+12VS
DIGITAL & SIGNAL
POWER SUPPLY SHUT-DOWN
Active Low
Q913
ShutDown
S.C.R.
TV 5V Short Det.
D972
+5V
D925
+9V
TV 9V Short Det.
On
E C
R9A
B
0
Q916
D958
On
PQS1
C
B
Q914
5 Power
E
Off
+3.3V Too Hi Det.
+5V Too Hi Det.
+12VS Too Hi Det.
Vcc
On
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