Check F801 insurance tube in good condition, switching power supply + 113 v, output voltage of + 16 v and 75 v respectively llV, are below normal. Measuring switch tube Q801 collector voltage of 285 v, normal. Disconnect line scan power supply circuit, in series with disconnect at 500 ma ammeter, the clock points to is the largest, that line scan working current big (about 400 ma when the normal), local fault line output transformer are suspicion. After replacement, troubleshooting.b6Aservice manual download site