Hitachi 46W500 Training page 12

L.E.D. (Visual Troubleshooting) for the Main Power Supply
(5 Total L.E.D. for visual trouble sensing observation, 4 Green and 1 Red)
T901
E901
18
17
28V
D922
E904
T901
15
L918
13
C932
C933
-28V
C940
D923
E905
14
C939
+115V D925
T901
11
12
C942
C943
Osc B+
AC
From
Relay
S901
C911
RED L.E.D.
Hot Ground from
pin 9 of T901
GREEN
D919
L909
L.E.D.
R931
C924
C925
D956
L910
1.77A
I905
3
SW+5.5V
Reg
2 5 8
C935
C941
R964
D954
L920
R965
R944 0.39 Ohm
Q905
R946
C949
Start Up
Run
R906 R907
16.3V
D911
R918
Driver/Output IC
D912
DP-3X CHASSIS
1.59A
9
IAA1
Ft. Audio
C926
Out
10
L914
1
R932
R934
6
C936
R933
GREEN
L.E.D.
L919
GREEN L.E.D.
See Shut
Down Circuit
D952 D953
L923
E907
+115V
R952
Over
Current
R953
D932
GREEN L.E.D.
D907
4
R914
Q901
I901
1
5
D910
Right Audio
7
12 Left Audio
PPS5
2.28A
8
L915
9
3 Gnd
4 Gnd
D955
5 Gnd
7 Gnd
PPD5
1.00A
1
2
0.85A
9
10
3
Gnd
4
Gnd
5
Gnd
6
Gnd
R913
From Pin 8 T901
7.5P/P
D908
I906
4
3
Regulator Photocoupler
2
I904
115V Regulator
C946
SW + 5.5V
SW+ 28V
SW+ 28V
SW + 115V
SW + 115V
SW + 115V
R940
R941
1
R942
2
D927
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