![background image](http://html1.mh-extra.com/html/viewsonic/g90f-b-3/g90f-b-3_service-manual_1020355025.webp)
6
﹒
Micro
(
IC301
)
6.1 H. sync / V. sync Processor
﹒
HS/VS
input
pin39
(
HS
)
﹐
pin40
(
VS
)﹐
IC301 individually to work on frequency
﹐
polarity
﹐
process of H+V
and
power
saving
﹐
then output horizontal sync
(
pin33
)
and vertical sync
(
pin32
)
of positive polarity to
IC401
STV9118
pin1
﹐
pin2
﹒
6.2
PWM
Control
The PWM control of IC301 is pin29
(
Brightness
)
and pin18
(
Rotation
)﹐
the PWM output via R
﹐
C after
rectified may control each function
﹒
6.3 Power saving / Mute / LED control
IC301 pin17
﹐
pin18 are power saving control pin
﹐
the condition of power saving and mode change
﹐
pin19 will
change from Low to Hi and active Mute function
﹒
Normal
Active
Mute L H
PD H L
(
Off mode
)
IC301
pin17
(
PD
)
function as LED control
﹐
the mode is as listed
:
Power On
Power saving
Over range freq
﹒
Pin17 Hi
Low
Low
6.4
CS
control
(
CS1 ~ HS2
)
To count H-SYNC by the output frequency
﹐
then output the cumulating as listed
:
Freq.
CS1 CS2 CS3 CS4 HS1 HS2
<
33K 0 0 0 0 0 0
33K~36K 0 0 1 1 0 0
36K~41K 1 0 0 0 0 0
41K~45K 1 0 1 1 0 0
45K~51K 0 1 0 0 0 0
51K~57K 0 1 0 1 0 0
57K~61K 0 1 1 1 0 1
61K~66K 1 1 0 0 0 1
66K~71K 1 1 0 0 0 1
71K~78K 1 1 1 0 1 1
78K~83K 1 1 1 0 1 1
83K~89K 1 1 1 1 1 1
>
89K 1 1 1 1 1 1
5
﹒
Tilt
IC301 pin18 PWM to tilt circuit
﹐
Q211 and Q213 control flow of current of Rotation coil
﹐
when the base of
C215 increase from 0 to 12V
﹐
As Q211 will turn on gradually
﹐
the current starts from 14V to 6.3V via Rotate
coil
﹒
When C215decrease from 12V to 0V
﹐
the current will change from 7V to GND
﹒
6.5
Key
Control
﹕
IC301 pin26~pin29 function as DAC switch input to control OSD display function
﹒
Pin40
:
﹒
Pin38
:▽﹒
Pin37
:△﹒
Pin39
:
﹒
6.6
I
2
C Bus
IC301 have two groups I
2
C bus to control E
2
PROM
﹐
IC401 deflection IC
﹐
Auto alignment
﹐
IC601 pre-AMP
﹒
1
2
22
ViewSonic
Corporation
Co
nfidential
-
Do
Not
Copy
G90f/B-3
Содержание G90f/B-3
Страница 26: ...Waveform 1 2 3 4 5 6 23 ViewSonic Corporation Confidential Do Not Copy G90f B 3...
Страница 27: ...7 8 8 10 11 12 24 ViewSonic Corporation Confidential Do Not Copy G90f B 3...
Страница 28: ...13 14 14 16 17 18 25 ViewSonic Corporation Confidential Do Not Copy G90f B 3...
Страница 29: ...19 20 20 22 23 24 26 ViewSonic Corporation Confidential Do Not Copy G90f B 3...
Страница 30: ...25 26 26 28 29 30 27 ViewSonic Corporation Confidential Do Not Copy G90f B 3...
Страница 31: ...30 32 33 34 34 36 28 ViewSonic Corporation Confidential Do Not Copy G90f B 3...
Страница 32: ...37 38 39 40 40 42 29 ViewSonic Corporation Confidential Do Not Copy G90f B 3...
Страница 33: ...43 44 45 46 46 48 30 ViewSonic Corporation Confidential Do Not Copy G90f B 3...
Страница 34: ...49 50 51 52 53 54 31 ViewSonic Corporation Confidential Do Not Copy G90f B 3...
Страница 35: ...55 56 32 ViewSonic Corporation Confidential Do Not Copy G90f B 3...
Страница 40: ...C PCB defined Main board 37 ViewSonic Corporation Confidential Do Not Copy G90f B 3...
Страница 85: ...82 ViewSonic Corporation Confidential Do Not Copy G90f B 3 8 Exploded Diagram And Spare Parts List...
Страница 88: ...85 ViewSonic Corporation Confidential Do Not Copy G90f B 3...
Страница 89: ...86 ViewSonic Corporation Confidential Do Not Copy G90f B 3...
Страница 90: ...87 ViewSonic Corporation Confidential Do Not Copy G90f B 3...
Страница 91: ...88 ViewSonic Corporation Confidential Do Not Copy G90f B 3...
Страница 92: ...89 ViewSonic Corporation Confidential Do Not Copy G90f B 3...
Страница 93: ...90 ViewSonic Corporation Confidential Do Not Copy G90f B 3...
Страница 94: ...91 ViewSonic Corporation Confidential Do Not Copy G90f B 3...
Страница 95: ...92 ViewSonic Corporation Confidential Do Not Copy G90f B 3...
Страница 96: ...93 ViewSonic Corporation Confidential Do Not Copy G90f B 3...
Страница 97: ...94 ViewSonic Corporation Confidential Do Not Copy G90f B 3...
Страница 98: ...95 ViewSonic Corporation Confidential Do Not Copy G90f B 3...
Страница 99: ...96 ViewSonic Corporation Confidential Do Not Copy G90f B 3...
Страница 100: ...97 ViewSonic Corporation Confidential Do Not Copy G90f B 3...
Страница 101: ...98 ViewSonic Corporation Confidential Do Not Copy G90f B 3...
Страница 102: ...9 Block Diagram 99 ViewSonic Corporation Confidential Do Not Copy G90f B 3...
Страница 103: ...10 Schematic Diagrams 100 ViewSonic Corporation Confidential Do Not Copy G90f B 3...
Страница 104: ...101 ViewSonic Corporation Confidential Do Not Copy G90f B 3...
Страница 105: ...102 ViewSonic Corporation Confidential Do Not Copy G90f B 3...
Страница 106: ...103 ViewSonic Corporation Confidential Do Not Copy G90f B 3...
Страница 107: ...104 ViewSonic Corporation Confidential Do Not Copy G90f B 3...
Страница 108: ...11 PCB Layout Diagrams 105 ViewSonic Corporation Confidential Do Not Copy G90f B 3...