Of frames, grating shiny when the phone is switched on, line output circuit basic normal work, turn it off when kinescope shiny, too, that high pressure has been added to the tube anode, no grating reason in the luminance channel and tube circuit. HfRservice manual download site
(1) the integrated intensity measurement channel AN5612, ABL, circuit basic work properly. HfRservice manual download site
(2) the measuring tube's power supply voltage, found the accelerating voltage is 100 v. HfRservice manual download site
(3) check the 900 v rectifier filter circuit, found R552 variable values, Ω Ω from 100 k to 100 k. Replace the jg grating returned to normal. HfRservice manual download site
When accelerating voltage is too low, the beam current was cut-off, caused no grating, but high voltage anode and graphite layer between the storage charge. Shutdown, the grid-cathode bias disappear, so the high voltage anode discharge, make the screen bright.HfRservice manual download site