Maintenance: (1) check the magnetron filament resistance of less than 1Ω, the filament on the shell barrier; (2) check the high voltage capacitor (1.5μF/2100V), with 500 multimeter R × 10K block the positive and negative contacts at both ends of the capacitor leads, there discharge instructions, and ultimately greater than 1MΩ; (3) to check high voltage diodes, with R × 10K block measuring transformer primary and secondary windings are forward interstage, inter-turn and ground resistance measurements, no exceptions.px7service manual download site
     After testing the fault type WD900SL23-2 is due to high pressure microwave fuse wire (0.75A/5kV) caused the fuse, replace troubleshooting. Failure WP-750 is due to the use of microwave ovens longer, long-term frequent changeover contact timer off, because the arc ablation, make contacts carbonation, resulting in poor contact. After the grinding treatment at a few of the contacts, troubleshooting.px7service manual download site