NEC MultiSync V520 Service Manual

Test Circuits
FIGURE 2 LM1281 OSD Video Preamp Demonstration Board Schematic
RED OSD INPUT
GREEN OSD INPUT
BLUE OSD INPUT
OSD INPUT SELECT
RED VIDEO IN
GREEN VIDEO IN
BLUE VIDEO IN
VIDEO CONTRAST
RED DRIVE ADJ.
GREEN DRIVE ADJ.
BLUE DRIVE ADJ.
RGB CUTOFF ADJ.
RED VIDEO OUT**
GREEN VIDEO OUT**
BLUE VIDEO OUT**
BLANK GATE
CLAMP GATE
OSD CONTRAST
POT6
100K
POT5
100K
POT4
100K
POT2
100K
POT1
100K
POT3
100K
R21 47k
R19
430
R20
2.4k
L1
R17
2.4k
R16
2.4k
R18
430
430
R15
R17
100
R17
100
R9
33
R10
50/75
R11
100k
R8
50/75
R7
33
R5
50/75
R6
R4
R3
R2
R1
*L1 is a Ferrite Bead
**50
Ω
Termination to
be Used at Outputs
TL/H/12355-12
C12
0.1
µ
F
C11
0.1
µ
F
C10
0.1
µ
F
C8
0.1
µ
F
V
CC
C9
10
µ
F
C6
100
µ
F
C7
0.1
µ
F
C4
C5
0.1
µ
F
C3
J1
C13
0.1
µ
F
C14
0.1
µ
F
C15
0.1
µ
F
C16
100
µ
F
C17
0.1
µ
F
C18
0.1
µ
F
C19
0.1
µ
F
C20
0.1
µ
F
C21
0.1
µ
F
C2
0.1
µ
F
C1
100
µ
F
V
CC
= + 12V
LM1281
TOP VIEW
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28
27
26
25
24
23
22
21
20
19
18
17
16
15
67

NEC MultiSync V520 Specifications

General

Brand	NEC
Model	MultiSync V520
Category	Monitor
Language	English