{458} SMPS Is Not Working || Fax Machine SMPS Not Turning ON

in this video number {458} SMPS Is Not Working || SMPS Not Turning ON, it is Panasonic fax machine KX-63BX, KX-63BX-W, its power supply model number PFLP1282EZL, SRF1018EK SMPS Output voltage Fluctuation / Switch Mode Power Supply Output Not Regulated. it is using KA7552 PWM controller ic, it have 24 volt and 5 volt outputs

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SMPS Output voltage Fluctuation / Switch Mode Power Supply Output Not Regulated. smps output fluctuation term is used when the output voltage of switch mode power supply are not being regulated properly. irregulated amplitude of the output in any smps is called fluctuation
it may be due to many reasons
1. main dc capacitor is internally open circuit
2. vcc capacitor of smps ic is open internally
3. vcc circuit / bias circuit / auxiliary circuit is open circuit
4. output circuit have some short circuit capacitor
5. feedback circuit is not working properly, it may be due to reference circuit, TL431 reference, or optocoupler or its related components

SMPS practical tutorial    • How SMPS Works || Understanding SMPS Switc...  
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00:00 repairing panasonic fax machine power supply
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01:30 smps low output with output fluctuation
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02:02 how to check vcc voltage of SMPS pwm controller IC
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