Analysis overhaul: from phenomenon analysis, description fault only out in Kara OK independent circuit in the, boot measuring microphone Qian Reset zoom IC (4558) of ± 15V power voltage exception (not symmetric), led Qian placed chunks cannot normal work, the power voltage from power adjustment tube 3DD15, check 3DD15 no exception, hand touch its shell Shi, fault disappeared, estimated for 3DD15 of c very contact bad. C with a wire connected directly to the circuit board after commissioning, troubleshooting.hCtservice manual download site