Samsung 720N - Page 13

4 Troubleshooting
4-3
4-3 DC output voltage is unstable
Check Vbe of
Q801 below
Check reference
voltage
Check feedback
circuit
Check Vpin3-4 of
IC801 about 6V
Check Vpin1-2 of
IC801 about
Check pins of
IC801
Check circuit if
short
Output Voltage Unstable
Check ZD801, ZD802,
ZD803, D803, D805
Check Q801, Q802
Check R810, R811
Check R801, R805,
R822, R823, R817
Check C815, D806, R812
Check C815, D806, R812
END