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Appendix
Service manual WP-795
2-8 Power supply (STR F6653)
2-8 -1 STR-F6653 general description
The STR-F6653 is an hybrid IC with a build-in MOSFET and control IC, designed for flyback converter
type switch mode power supply applications.
2-8 -2Power supply primary part operations
An oscillator generates pulses signals which turn on and off a MOSFET transistor.
2-8 -2-1 Start -up circuit: V
IN
The start-up circuit is used to start and stop the operation of the control IC, by detecting a voltage
appearing at V
pin (pin 4).
IN
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