OFF-Power cut warn

(200ms do not detect cut of OZ)

Solution step
1）Error solution steps
To hear whether it is sound of relay when the power is cut.
Check impedance of R15:220K, check D3 by channel          on multimeter, check the resistance of diode: 0.48V
Access monitoring interface of operation panel to see how much voltage of UDC interface.
If the voltage of udc interface is not correct, supply power of 80V by isolation transformer, check the resistance of R143 which on main board: 100Ω; Impedance of C77:around 3.8M; Voltage of two sides( leg 1 and leg 4[ground] of U9):around 0.56; Impedance of R91: around 1K.
Check impedance of C21 on main board: 11.5K; supply power of 80V by isolation transformer, standby voltage:around 2.1V; Impedance of R91:around 1K.
[supply power of 80V by isolation transformer] Check impedance of leg 1 and leg 2[ground] of Q10 which on main board: around 6.6K; standby voltage: around 0.28V; impedance between leg 3 and leg 2[ground]: 10.5K; standby voltage: around 2.1V;
[same picture as E16]