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What influences the Vref of UC3825N that can only read 3.5V instead of 5.1V ???

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Hello All...please help me in my troubleshooting. Got power supply with multiple output but all read 0V when powered-up. Got this pwm UC3825N vref read 3.5V instead of 5V. The vcc read 10V. Please see the photo...any help is really appreciated...thanks.

Asteryn_Pwr_Supp.png
 

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