![background image](http://html1.mh-extra.com/html/viewsonic/a90f-1/a90f-1_service-manual_1020116022.webp)
7. A
djustment
Signal generator: Chroma 225 or equivalent.
The adjustment data with tolerance is only for setting to the optimum performance.
SERVICE ADJUSTMENT LOCATIONS
Main Board (parts side view)---PWB-0334-B
F1
Variable Resistor on top of FBT for Static Focus adjustment.
F2
Variable Resistor on middle of FBT for Dynamic Focus adjustment.
G2
Variable resistor on bottom of FBT for Grid 2 set up.
R167
Full white brightness adjustment.
R176
High voltage setting.
R454
Raster
center.
R827
B+ = 82V setting.
R817A
Set power supply working frequency.
R319A
Set 35k/66.7hz H.SIZE over bezel 2mm.
Degauss
To degauss function.
Enter key
Enter OSD key.
Down key
Decrease adjust value or counter clockwise select Icon
Up key
Increase adjust value or clock wise select Icon
7-1 B+ ( 82V) output voltage adjustment
a). Apply Chroma 2225 signals with any pattern to the monitor.
b). Connect AC input and power on the monitor.
R319A
R454
F1
F2
R176
R167
FBT
Power
Transformer
PWB-334-B
R817A
R827
ViewSonic Corporation
19
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...