7H3service manual download site
AFC waveform due to correct description of pulse waveform line ¢ß pin output becomes normal , the problem lies between the C657 to D617 components have been checked . Because the pulse bottom level is elevated, and because of the negative termination 12V D615 , D615 reverse leakage therefore suspect that the negative side 12V voltage through D615 reach positive terminal. Remove the D615 measure its reverse unstable leakage, replacement 1N4148 diode , troubleshooting.7H3service manual download site
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