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P780
A BOARD SCHEMATIC DIAGRAM
1
2
3
4
5
A
B
C
D
E
F
G
H
I
J
K
L
Schematic diagrams
Block diagram
A board
— 23 —
FOLDOUT 2
2
6
7
8
9
10
11
12
A BOARD IC VOLTAGE LIST
A BOARD TRANSISTOR
VOLTAGE LIST
IC001
10
3.0
21
3.3
pin
volt
11
2.0
22
11.9
B
C
E
1
4.0
12
0.2
23
GND
Q001
11.4
505
10.9
2
4.6
13
0
24
2.1
Q006
0.3
3.6
GND
3
3.0
14
0
25
3.3
All voltages are in V
4
2.6
15
0
26
GND
5
2.6
16
11.9
27
2.3
6
3.2
17
0
28
3.3
7
2.0
18
0.9
29
11.9
8
4.8
19
GND
30
2.6
9
2.0
20
2.2
— 24 —
13
14
15
16
17
18
IC002
9
2.1
6
5.0
IC004
10
N C
7
10.4
6
4.6
pin
volt
10
11.8
7
4.1
pin
volt
11
178.4
8
11.6
7
GND
1
50.5
11
2.2
8
4.6
1
GND
IC005
IC006
8
0.3
2
GND
IC003
9
5.0
2
11.9
pin
volt
pin
volt
9
0.3
3
49.8
pin
volt
10
0
3
4.8
1
N C
1
N C
10
4.6
4
GND
1
0.5
11
N C
4
4.8
2
N C
2
0
11
GND
5
49.7
2
1.1
12
0
5
4.8
3
N C
3
0
12
GND
6
78.7
3
1.1
13
0
6
N C
4
GND
4
0.5
13
N C
7
GND
4
5.0
14
0
7
93.7
5
3.2
5
4.6
14
4.9
8
2.1
5
3.6
15
0
8
94.0
6
3.0
All voltages in V
16
GND
9
101.8
— 25 —
8/6/99, 10:42 AM
19
NOTE:
Portions of this circuit marked as shown are high
voltage areas. Use care to prevent electric shocks
during inspection or repair.
A BOARD WAVEFORMS
2
3
1
1.1 Vp-p (H)
1.1 Vp-p (H)
1.2 Vp-p (H)
4
5
6
4.1 Vp-p (H)
4.0 Vp-p (H)
4.6 Vp-p (H)
7
8
9
A BOARD LOCATOR LIST
DIODE
D001
D002
59.3 Vp-p (H)
56.5 Vp-p (H)
58.7 Vp-p (H)
D003
D004
10
11
12
D005
D007
D008
D014
D015
52.2 Vp-p (H)
54.0 Vp-p (H)
54.0 Vp-p (H)
D104
A
[ VIDEO ]
1
2
3
4
5
A
B
C
D
E
F
— 22 —
D105
A-5
IC
E-8
D106
B-5
IC001
B-4
E-2
D111
E-2
IC002
A-6
E-2
D204
B-6
IC003
B-2
E-2
D205
B-6
IC004
C-7
F-6
D206
E-3
IC005
E-7
F-5
D211
E-3
IC006
D-2
F-5
D304
B-6
TRANSISTOR
D-7
D305
B-7
Q001
D-7
E-2
D306
B-6
Q006
C-2
B-6
D311
E-3
6
7
8
— 26 —
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