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    Check whether the furnace door and front chamber furnace door rise and fall normally, and whether the speed meets the requirements. Inspect whether the lifting table of quenching is stable under no-load and full load, whether the position is correct, and whether the speed meets the requirements. Check whether the mixing atmosphere circulation effect of the fan meets the requirements. Check whether the output voltage and current of transformer at all levels and radiant tubes meet the requirements. First manually several times, and then check the empty bottom plate and full load parts of the furnace action is accurate. Check whether the quenching oil circulation system is normal. Use compressed air instead of endothermic controllable atmosphere, and input it into the furnace according to the process flow to see if the furnace pressure is normal (check the sealing performance of the furnace).