![background image](http://html1.mh-extra.com/html/viewsonic/a90f-1/a90f-1_service-manual_1020116007.webp)
Noted that A90f + belong to MPR II models.
Alignment default conditions:
3.1 Room luminance: 225 LUX.
3.2 Warm up: Mis-convergence: 30 minutes (Full white display).
Other spec.: 20 minutes.
Display usable: 15 sec.
3.3 CDT direction : East
3.4 Pattern generator : CHROMA 2250 or equivalent.; (Video O/P: 0.7 Vpp).
3.5 Earth Magnetic field:
Northern Hemisphere: Bh : 0.25 +/- 0.01 GAUSS ; Bv : 0.45+/- 0.01 GAUSS –U03 model.
Southern Hemisphere: Bh : 0 +/- 0.01 GAUSS , Bv : -0.52 +/-0.01 GAUSS.
3.6 AC Power input: 110V AC, 50/60 Hz ;230V AC ,50 /60Hz.
3.7 Ambient temperature: 20
²
5
ʑ
.
3.8. Preset Mode Timing: Total 13 Pre-set Modes + 1 mode (mode 5 for self test setup)
MODE RESOLUTIO
N
H X V
NO.
H.FREQ
(kHz)
V.FREQ(
Hz)
H.
POLART
Y
V.
HORIZ.
TOTAL
USEC
H.
DISPLAY
USEC
H.BACK
PORCH
USEC
H.SYNC
WIDTH
USEC
VERT.
TOTAL:
MSEC
V.DIS-
-PLAY
MSEC
V.BACK
PORCH
MSEC
V.SYNC
WIDTH
MSEC
VIDEO
RATE
MHz
VGA
640 X 480
1
31.469
59.94
31.778 25.422 1.907
3.813
16.683 15.253 1.049
0.064
25.175
VGA
640 X 400
2
31.469
70.078
-
+
31.779 25.422 1.907
3.813 14.269 12.712
1.112
0.064 25.175
MAC
640X480
3
35.0
66.667
Composit
e
Negative
28.571 21.164 3.175
2.116
15
13.714 1.114
0.086
30.24
640X480
4
37.5
75
26.667 20.317 3.81
2.032
13.333 12.8
0.427
0.080
31.5
VESA
85Hz
640 X 480
5 (for
auto-size
reference)
43.269
85.008
23.111 17.778 2.222
1.556
11.764 11.093
0.578
0.069
36
VESA
75Hz
800 X 600
6
46.875
75
+
+
21.333 16.162 3.232
1.616
13.333 12.8
0.448
0.064
49.5
MAC
832X 624
7
49.725
74.5
20.111 14.524 3.910
1.117
13.414 12.549 0.784
0.06
57.28
800 X 600
8
53.674
85.061
+
+
18.631 14.222 2.702
1.138
11.756 11.179
0.503
0.056
56.25
VESA
75Hz
1024 X 768
9
60.023
75.029
16.660 13.003 2.235
1.219
13.328 12.795 0.466
0.050
78.75
1024 X 768
10
60.241
74.927
16.6
12.8 2.2 1.2
13.346
12.749
0.498 0.05
80
VESA
85Hz
1024 X 768
11
68.677
84.997
14.561 10.836 2.201
1.016
11.765 11.183
0.524
0.044
94.5
1600 X 1200
12
75.0
60
13.333 9.877
1.877
1.185
16.667 16
0.613
0.04
162
VESA
75Hz
1280 X 1024
13
79.976
75.025
12.504 9.481
1.837
1.067
13.329 12.804 0.475
0.038
135
VESA
1024 X 768
14
48.363
60.004
20.677 15.754 2.462
2.092
16.666 15.880 0.600
0.124
65
ViewSonic Corporation
4
Confidential – Do Not Copy
A
9
0f+-1
Summary of Contents for A90f+ 1
Page 57: ...12 PCB Layout ViewSonic Corporation 54 Confidential Do Not Copy A90f 1...
Page 58: ...VIDEO PWB 0414 ViewSonic Corporation 55 Confidential Do Not Copy A90f 1...
Page 59: ...KEY CONTROL PWB 0488 ViewSonic Corporation 56 Confidential Do Not Copy A90f 1...
Page 60: ...MAIN BOARD 13 Schematic Diagrams ViewSonic Corporation 57 Confidential Do Not Copy A90f 1...
Page 61: ...VIDEO ViewSonic Corporation 58 Confidential Do Not Copy A90f 1...
Page 62: ...KEY CORTROL ViewSonic Corporation 59 Confidential Do Not Copy A90f 1...
Page 63: ...POWER SUPPLY CKT ViewSonic Corporation 60 Confidential Do Not Copy A90f 1...
Page 64: ...MCU CONTROL CKT ViewSonic Corporation 61 Confidential Do Not Copy A90f 1...
Page 65: ...Time Base DeflectionCKT ViewSonic Corporation 62 Confidential Do Not Copy A90f 1...
Page 66: ...H V DYNAMIC FOCUS CKT ViewSonic Corporation 63 Confidential Do Not Copy A90f 1...
Page 67: ...14 Exploded Diagram ViewSonic Corporation 64 Confidential Do Not Copy A90f 1...