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ViewSonic Corporation
Confidential - Do Not Copy
VA702-1_VA702b-1
36
3.
DC output voltage is unstable
Output Voltage Unstable
Check Vbe of
Q801 below
0.3V
Check circuit if
short
Check ZD801, ZD802,
ZD803, D803, D805
Check Q801, Q802
Check reference
voltage
Check pinR
of IC801
Check R809, R814,
IC801, R818
Check R810, R811
Check feedback
circuit
Check Vpin3-4 of
IC801 about 6V
Check Vpin1-2 of
IC801 about
1V
Check C815, D806,
R812
Check R809,
R814
END
Содержание VA702-1
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Страница 60: ...11 PCB Layout Diagrams Main board Top layout ViewSonic Corporation Confidential Do Not Copy VA702 1_VA702b 1 57...
Страница 61: ...Main board bottom Layout ViewSonic Corporation Confidential Do Not Copy VA702 1_VA702b 1 58...
Страница 62: ...ViewSonic Corporation Confidential Do Not Copy VA702 1_VA702b 1 59 POWER board...
Страница 63: ...ViewSonic Corporation Confidential Do Not Copy VA702 1_VA702b 1 60...