This machine is A3 movement. Cold boot observe all normal, as long as you can work continuously without stopping the machine. After thermal shutdown must wait 3-4 hours to re-boot, otherwise power can not be started. Measured switching power supply +300 V is normal, normal startup resistor, no short supply secondary, primary power each component is also no problem. Thermal stability is always suspected adverse elements but is not found, repair them in trouble. Stop and careful analysis, A3 power supply design on protective measures is still relatively good, it seems that the power

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