![background image](http://html1.mh-extra.com/html/viewsonic/a91f-1/a91f-1_service-manual_1020119038.webp)
B
﹒
INSTRUMENT ALIGNMENT
﹒
1.
Defection
Presets
﹒
Control
pots
VR101
﹑
VR401
﹑
VR4401
﹑
VR4402 are set at middle point. Screen
﹐
Focus VR set to min
﹒
2.
Power
Supply
Alignment
﹒
2.1
Input
VGA
(
480
)
signal cross-hatch pattern & beam current set at 0µA
﹒
2.2 Adjust VR101 until TP202 = 40V
±
0.3V at TP202
﹒
2.3 Adjust VR4401must be high voltage 26KV +/- 1.0KV .
3.
Size & Geometry Adjustment
﹒
3.1
Raster
Centering
﹒
3.1.1
Input cross hatch pattern at 60K 1024* 768 Hz mode
﹒
3.1.2
Adjust contrast to 10FL
﹐
adjust screen just raster visible
﹒
3.1.3
Adjust VR401 to center raster on screen such that the horizontal
distance
from
the
midpoint
of the left display edge to the
left bezel edge is within 2mm of the distance from
the
midpoint
of
the right display edge to the right bezel edge
﹒
3.2
Picture
Size
﹒
Input mode 1~11 signal adjust V-size
﹐
H-size to achieve
﹒
H-SIZE
:
352mm
±
4mm
V-SIZE
:
264mm
±
4mm
3.3
Picture
Centering
﹒
Input mode 1~9 adjust V-position
﹐
H-position such that the picture is centered with the screen
﹒
Bezel
Picture
D
A
B
C
lA – Bl < 4mm
lC – Dl < 4mm
A
B
Bezel
Raster
A-B 2mm
352mm
264mm
Picture
Bezel
35
ViewSonic
Corporation
Co
nfidential
-
Do
Not
Copy
A91f+-1
Summary of Contents for A91f+-1
Page 27: ...1 2 3 4 5 6 24 ViewSonic Corporation Confidential Do Not Copy A91f 1...
Page 28: ...7 8 9 10 11 12 25 ViewSonic Corporation Confidential Do Not Copy A91f 1...
Page 29: ...13 14 15 16 17 18 26 ViewSonic Corporation Confidential Do Not Copy A91f 1...
Page 30: ...19 20 21 22 23 24 27 ViewSonic Corporation Confidential Do Not Copy A91f 1...
Page 31: ...25 26 27 28 29 30 28 ViewSonic Corporation Confidential Do Not Copy A91f 1...
Page 32: ...31 32 33 34 35 36 29 ViewSonic Corporation Confidential Do Not Copy A91f 1...
Page 33: ...37 38 39 40 41 42 30 ViewSonic Corporation Confidential Do Not Copy A91f 1...
Page 34: ...43 44 45 46 47 48 31 ViewSonic Corporation Confidential Do Not Copy A91f 1...
Page 35: ...49 50 51 52 53 54 32 ViewSonic Corporation Confidential Do Not Copy A91f 1...
Page 36: ...55 56 57 58 33 ViewSonic Corporation Confidential Do Not Copy A91f 1...
Page 41: ...C PCB defined 38 ViewSonic Corporation Confidential Do Not Copy A91f 1...
Page 62: ...59 ViewSonic Corporation Confidential Do Not Copy A91f 1...
Page 63: ...60 ViewSonic Corporation Confidential Do Not Copy A91f 1...
Page 64: ...61 ViewSonic Corporation Confidential Do Not Copy A91f 1...
Page 65: ...62 ViewSonic Corporation Confidential Do Not Copy A91f 1...
Page 66: ...63 ViewSonic Corporation Confidential Do Not Copy A91f 1...
Page 67: ...64 ViewSonic Corporation Confidential Do Not Copy A91f 1...
Page 68: ...65 ViewSonic Corporation Confidential Do Not Copy A91f 1...
Page 69: ...66 ViewSonic Corporation Confidential Do Not Copy A91f 1...
Page 70: ...67 ViewSonic Corporation Confidential Do Not Copy A91f 1...
Page 71: ...68 ViewSonic Corporation Confidential Do Not Copy A91f 1...
Page 72: ...69 ViewSonic Corporation Confidential Do Not Copy A91f 1...
Page 73: ...70 ViewSonic Corporation Confidential Do Not Copy A91f 1...
Page 74: ...71 ViewSonic Corporation Confidential Do Not Copy A91f 1...
Page 75: ...72 ViewSonic Corporation Confidential Do Not Copy A91f 1...
Page 76: ......
Page 77: ......
Page 78: ......
Page 79: ......
Page 80: ......
Page 81: ......
Page 82: ...79 ViewSonic Corporation Confidential Do Not Copy A91f 1...