Open inspection, found that the machine of switch power supply switch tube (TE840) short circuit breakdown, integrated piece of short circuit, 6, 7 feet UC3844 SR1, SR3, SR5, SR6 have burn out. Will damage the components to replace after the boot back to normal (SR5 with 31 Ω resistance, SR1 and SR6 with 34 Ω, SR3 with 12 Ω). rhhservice manual download site
UC3844 as the machine of switch power supply pulse width modulation integrated block, 7 feet for integrated power supply, output for the switch tube power supply 6 foot, 6, 7 feet after short circuit, the 300 v dc voltage by the SR1, G SR6 directly added to the switch tube, the switch tube short circuit breakdown, all added to the SR3 on 300 v voltage, SR3 burn out immediately, after the 300 v voltage, to add to a SR5 SR5 also burn out immediately. This is the reason why the fault series of component damage.rhhservice manual download site