Judging from fault phenomena, static focus and red gun convergence occurs deviation. Open the front cover, adjust the focus potentiometer on the board, focus can quickly find your green and blue guns alignment, red gun control have change, but is not allowed. Red gun will focus line switch with green, red gun still adjustable, can determine the focus plate is normal, focusing on the problem may be in the red barrel. When see remove red shot board, found that tube yellow, circuit boards with traces of grease and rust, change the header, clean put board after boot, red gun is focused on the normal, but the red image of intermittent swelling, red gun convergence is still bad. From the program menu into convergence adjusting, found that the red gun convergence adjusting changes slightly, apparently circuit and fault. Review board, spot DZ502 (6.8 V voltage regulator tube) breakdown, replace the new tube, boot to red gun convergence, is normal. Then enter factory convergence adjusting mode, each gun convergence unit adjustment to normal.vSMservice manual download site