Boot check for normal audio, images can be seen, but at the bottom of the grating up, like a edge, the grating jitter, scan line density change sharply and stripes. According to the phenomenon of judgment, fault should present the circuit and the power supply part. Check field power supply circuit is normal, and focusing on output circuit, the circuit reference graph (circuit form, only part drawings marked different parameters). First to experiment with the method of the shunt capacitance, the machine drawing C681 labeled 470 pf, with their 470 pf mica capacitor and on C681, fault phenomenon disappeared. Remove the C681, using a capacitance meter capacity, has no capacity, with a multimeter to measure resistance of infinity, has been open. After the replacement C681 troubleshooting.jmpservice manual download site