Symptom 1: The hand is placed in the hot air outlet, no hot air is blown out, only the cold air is blown out.
Analysis and overhaul: There is cold air blowing, indicating that the hair dryer motor is working, and the infrared detection and control circuit is normal. Only cold air, indicating that the heater is open or the wiring is loose. After inspection, the heater wiring is loose. After reconnection, there is hot air blowing out and troubleshooting.
Symptom 2: After power-on, the hand has not been placed in the hot air outlet. The hot wind is blown out of control.
Analysis and overhaul: After investigation, the thyristor has no breakdown phenomenon, which is suspected to be leakage breakdown of the internal photosensitive tube of the photocoupler 3 and 4 feet. After replacing the optocoupler, the work returns to normal and the fault is eliminated.
Symptom 3: The hand is placed in the hot air outlet, and no hot air is blown out.
Analysis and overhaul: check the fan and heater are normal, measure the thyristor gate without trigger voltage, measure the control cray VI has a rectangular wave signal output, suspected that the optocoupler is poor e, use the multimeter Rxl0 to block the optocoupler 3 The positive and negative resistances between the four legs are infinite. The normal forward resistance should be several m, and the reverse resistance is infinite. It is determined that the internal photosensitive tube is open, resulting in the thyristor gate not receiving the trigger voltage. Can't turn on. After replacing the optocoupler, troubleshoot.
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