![background image](http://html1.mh-extra.com/html/viewsonic/a90f-1/a90f-1_service-manual_1020116025.webp)
(6). Vertical Center
Adjustment.
(Every Mode.)
1). Pattern: CHROMA 2225, Pattern 1.
Brightness: Center; Contrast: Max.
2-a). Select” Vertical Center” Icon.
-b). Pressing ”UP or DOWN” Key and
Adjust ”Video display” to vertical center.
(Every Mode)
(7). Rotation Adjustment.
1). Pattern: CHROMA 2225, Pattern 1.
Brightness: Center; Contrast: Max.
2-a). Select “Rotation” Icon.
-b). Pressing” UP or DOWN” Key and
Adjust ”Video display” to center.
Adjust” Mode 13” Only.
(8). Geometric distortion
Adjustment.
1). Pattern: CHROMA 2225, Pattern 1.
Brightness: Center; Contrast: Max.
a). Pin-balance
Adjustment.
(Every Mode)
2-a) Pin-balance Adjustment :
1). Select “Pin-balance” Icon.
2). Pressing “UP or DOWN “ Key and
adjust
(orthogonality) to get the best.
b). Parallelogram
Adjustment.
(Every Mode)
2-b). Parallelogram Adjustment:
1). Select “ Parallelogram” Icon
2). Pressing “ UP or DOWN “ Key and
adjust
(orthogonality) to get the best.
c). Pincushion
Adjustment
.
(Every Mode)
2-c). Pincushion Adjustment:
1). Select “pincushion” Icon.
2). Pressing “ UP or DOWN” Key and
adjust
to get the best.
d).Keystone Adjustment
(Every Mode)
2-d). Keystone Adjusts:
1). Select “Keystone” Icon.
2). Pressing “UP or DOWN” Key and
adjust
to get the best.
1). Setting: 352(w) x 264 (h)
mm.
Brightness: Center; Contrast:
Max.
2). Spec.:
a) pincushion distortion <1.0
mm.
b) local distortion: < 0.5
mm.
(Every 50mm only).
c). Other : Any of distortion
should
be fall into <= 1.5 mm.
* Use Window Gauge
(Every Mode)
D
C
Ѩ
C-D
ѨЉ
1mm
ViewSonic Corporation
22
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...