Daewoo DWP-28W2ZZF Service Manual download pdf (Page 61)

Appendix Service manual WP-795

- 34 -

When the power switch is pushed on, V

increases slowly. During this time, C806 is charged through

R802.

As soon as V

reaches 16V, the STR-F6653 control circuit starts operating. Then, V

is obtained by

smoothing the winding voltage which appears between pin6 and pin7 of the SMPS transformer.

As this winding voltage does not increase to the set voltage immediately after the control circuit starts

operating, V

starts dropping. However, as this winding voltage reaches the set value before V

voltage

drops to the shutdown voltage (at 11V), the control circuit continues operating (see below V

voltage at

start-up). R805 resistor prevents that V

pin voltage varies according to the secondary side output current.

must be set higher than the shutdown voltage (V

(off) = 11V

max

) and lower than the O.V.P.

(overvoltage protection) operating voltage

OVP

= 20.5V

min

)

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Daewoo DWP-28W2ZZF Service Manual Page 61