Service Manual
9
voltage is from 90V to 264V. R850/
R
851/R852 are joined between two inputting main circuit to prevent
man from shock. L85
0
is used to filter low frequency noise. C850 and C851 are used to discharge the
noise that L85
0
produced. High frequency waves are damped by C852;
2.2.3)High Voltage to Low Voltage Control Circuit:(fig.6)
fig.6
D850 is a rectifier in which there are 4 build-in diodes, inverting AC to DC.
C854 is used to smooth the wave from rectifier. U850 is a highly integrated PWM controller.
Typical start-up current for U850 is only
20
uA, When current flow through R8
4
1/R842/R843 gets to
Pin
3
of U850, with VDD hold-up capacitor C85
5
, U850 is enough for starting up.
When U850 begins to operate Pin8 of U850 will output square wave to drive Q850, then the main
current flow get to GND bypassing through T850, Q850. Because of the change of current flow, wires in
the other side of T850 will induct current. In the same time, the current inducted by wires which
connected T850 Pin 1 and Pin 3, with components of D852, R8
56
and C8
55
,will be supplied to U850 for
normal operating.
Содержание E2209Wf
Страница 1: ...Service Manual 0 Service Manual LCD Monitor E2209Wf ...
Страница 7: ...Service Manual 6 Fig 12 ...
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Страница 21: ...Service Manual 20 Chapter 4 Disassembly Assembly 1 Exploded Diagram ...
Страница 22: ...Service Manual 21 2 E2209WFPf Disassembly Block Note 1 The arrows point out the direction of disassembly ...
Страница 23: ...Service Manual 22 3 Assembly Block Note 1 The arrows point out the direction of assembly ...
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Страница 46: ...Service Manual 45 2 power board schematic ...
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Страница 50: ...Service Manual 49 Attachment 3 PCB Layout power inverter bd power inverter board Top Layer ...
Страница 51: ...Service Manual 50 Bottom Layer ...