No output voltage of the power supply.

In KA5Q1265RF regulator the measured voltages are:

pin 2 ,3, 4, 5 --> 0V
pin 1 ------------> 310V.

Display completely off
unlit display

I changed the photocouplers located near this regulator but even so the device does not turn on

Short circuit in load can be
May be it is useful
Please test R821(may be break), change C822

As the electric scheme of the device was examined the 10 ohms resistor and capacitor 47uF / 50V on the pin 3 of the regulator and measured voltage less than 1V on this pin.

Цитата:

Сообщение от eletmoraes

... and measured voltage less than 1V on this pin.

Cut R821.
Measure him.
This is a standard problem.

http://www.alldatasheet.com/view.jsp...r7AaAtP_8P8HAQ