This machine failure occurs, is likely to be poor signal board (A board), it is possible that the power board (P) bad cause. Some soft fault it is difficult to tell which board is caused not work properly. Therefore, it is necessary to separate detection power panel. Maintenance, can be removed from the machine, the power board and the 24 v power supply output plug in 100 w bulb false load, at the same time with 4.7 k Ω resistance in P3 of socket (13) and (12) the feet between simulation (7 VSTB access attending foot boot signal). Connected after the electricity, if combined with 220 v power supply, power supply board output of each power supply voltage is normal, means that the power board is good, the fault is caused by A plate. On the other hand, the fault in the power supply board.6QJservice manual download site