A case of the maintenance of Granville amplifier h1000 energized, fault phenomenon: after power on the left side of the screen there is light, but there are no characters, sometimes nothing. Can not drive.Zavservice manual download site
Maintenance process analysis: according to the fault phenomena, estimated fault location is the power supply part and disassemble observation circuit, and @# this series of machines are the same as small transformer for standby power supply and control operation of main transformer. Small transformer output three sets of voltage,Zavservice manual download site
Are 1 pairs of 35 volts, 14 pairs of 2 volts, 10 volts, 15 pairs 3 volts. Check the small transformer without output, the primary measurement has been open; therefore, the judgment of transformer bad. After removing the transformer found primary temperature fuse is disconnected and connected to the insurance, bright display, operation to boot, but less than three minutes transformer began to smoke, very serious fever, check the load panel rectifier circuit has short circuit, after the replacement test machine transformer fever is still very serious, coil has been damaged, but re customized transformer.Zavservice manual download site