LG MA8000ST Service Manual - Page 26

(Display operates properly) CONDITION wave CHECK Disconnect-the wire leads from relay 2 and check continuity of rela 2 Operate the unit) RESULT rsio-continuit Continui Checkh h vol tape transf Abnormal Normal tage caPacit0r- Check high vnltage diode. Abnormal Normal Abnormal CAUSE assembly. REMEDY ep ace PCB assembly. g rmer. place hig rmer. efective high voltage capacitor. du IIUlI ge capacitor. Defective high voltage diode. Replace high_ voltage diode Check magnetron. Abnormal NOTE-!Make sure the wire=leackkeerrect position • When Removing_thewireleads fro • When removing the magnetr and-i-n=good condition. Defective magnetron. Replace magnetron. Output Is full power when you I power level Disconnect t wire leads from reli and check continuity relay 2. (Operate-the-unit)- Abnormal. Defective PCB Replace PCB ► asseirtly_ -411I assembly 5-15