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Service manual WP 895/895F, CP885/885F
When the power switch is pushed on, V
As soon as V
reaches 16V, the STR-F6654 control circuit starts operating. Then, V
IN
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 (at 11V), the control circuit continues operating (see below V
V
pin voltage varies according to the secondary side output current.
IN
V
must be set higher than the shutdown voltage (V
IN
protection) operating voltage
(V
= 20.5V
)
OVP
min
increases slowly. During this time, C806 is charged through R802.
IN
(off) = 11V
IN
- 58 -
is obtained by smoothing the
IN
voltage drops to the shutdown
IN
voltage at start-up). R805 resistor prevents that
IN
) and lower than the O.V.P. (overvoltage
max
IN
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