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4.5 No Sound (Test signal: 1r.m.s sine waveform)
YES
YES
NO
Check that ICA3 Pin 7 is approximately 12V
Check that ICA1 Pin 3 is
approximately 9V
Check that Q306 Pin 4 is
Low voltage
YES NO
Check Q306
Pin5, 6, 7, 8 is12V
Failure point
1. JA1 failure
2. IC400 pin123 failure
Check ICA2 pin11
Pin15 signal is
FIG 17.
Check ICA1 pin2
is about 12V
NO
YES
YES
NO
Check ICA5, ICA6 pin 4 is
about 5V
Failure point
1. QA6 or QA7 failure
2. ICA3 failure
YES
NO
Check ICA3 pin 4, 6
is FIG18.
Failure point
1.ICA1 failure
2.IC400 pin 123 failure
ICA5 or ICA6 failure
IC400 pin 125 failure
YES
NO
NO
Q306 failure
5
5
!
ViewSonic Corporation
Confidential – Do Not Copy
VX
8
00-3
Содержание VX800-3
Страница 56: ...6 Mechanical Assembly 62 ViewSonic Corporation Confidential Do Not Copy VX800 3...
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Страница 59: ...BASE ASSEMBLY 65 ViewSonic Corporation Confidential Do Not Copy VX800 3...
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Страница 62: ...7 Schematic Diagrams 57 ViewSonic Corporation Confidential Do Not Copy VX800 3...
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Страница 69: ...8 PCB Layout ViewSonic Corporation Confidential Do Not Copy VX800 3 64...
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