First clockwise adjust the screen grid voltage adjustment potentiometer, improve the screen grid voltage, the screen may have three kinds of cases: (1) there is no light; (2) grating is a bright line; (3) the full screen back to the sweep line grating. On "(1)" case, easily damaged components for T702 winding output transformer short circuit, there are horizontal output transistor V702 (BU2508DF) breakdown, is rarely for overvoltage protection tube V709 (2SC458) damage and retrace capacitance C715 (470pF / 1600V), C726 (9100pF / 1600V) and line deflection coil short circuit. On "(2)" case, is usually the field scanning block IC601 (TDA3653) damage, some field power supply current limiting resistor R930 (2.2 ohms) open, the occasional feedback branch of the R616 (15K), R617 (8.2k) and RP615 (4.7K), RP618 (220) increased resistance or open, but not to the power rectifier filter circuit failure. On "(3)" case, is Fort pulse with fault and transmission circuit. Easily damaged components is Fort pulse limiting zener diode V504 (H2 - 12A) breakdown or R705 (2.2) open circuit, there are R704 (2k Ω) resistance is large or openRqFservice manual download site
For the above three cases have no light, only one adjustment (the screen grid voltage (two), observe the screen grating), can quickly judge, troubleshooting.RqFservice manual download site