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3279 MlM
Chapter 1. General Description and Loclltion
*
DANGER
Pins may be-up to
250 V
above ground potential
Use probe,
IBM
Part
1749249/1749250.
Skip
Skip.
Vertical Sync
-5V
Gnd from A3
+12 V LOPT
- Display Ready
3
4
5
6
7
*1
8
9
10
11
12
13
14
15
16
P3
+12 V
±12 V Retum
-12 V
103 V Return
103 V
Ground
Ground
LOPT
.lOPT Return
Line Input
•
Line Test Point
Degauss
Degauss Return
• - Neutral Test Po-int
Neutral Input
Ground
Test Points are shown
as bullets ( • )
Power Supply
Edge Connector - - - - - - - ,
Pin Assignments
~~~ Securin g , _ _ _ ---..
Degauss COil
P12-----~~~
- Display Ready
+5V
+8.5 V
+8.5 V •
+5 V •
Gnd •
+103 V •
Brightness Pot
I
ntensity
Override Sw 4
Intensity Override Sw 1
Brightness 2 To Color Balance
-135 V •
+6.3 V Return •
+70
V •
+6.3 V •
Figure 1-2. Display Unit - Front View with Bezel Removed
26
Horizontal Sync
27
•
Hariz Sync
28
3
•
Vert Sync
29
4
o
V form A3
30
5
•
-5 V
31
6
o
V to security
key lock
32
7
o
V
to
Color Sw
33
8
34
9
o
V to
A,af
A Switch
35
l)
o
V to LED Card
36
11
37
12
"Power Good" (+5 VI
38
13
Input Prohibited
39
14
+103 V Return
40
15
+103 V
41
16
Brightness 3
42
17
Brightness 1
43
18
Intensity Override Sw 2
44
19
Brightness 2
45
20
Balance Pots Ret (-150 V/39
46
21
47
22
Heater (6.3 V) Return
48
23
+70 V to Video
49
24
+70 V Return
50
25
Heater (+6.3 VI
P4
Analog Card
Edge Connector
Pin Assignments
1-4
kUI
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