Electronics > Repair
Why does not this hair straightener work?
inse:
Are the LEDs back on again?
Are the wire connections between the two boards OK?
Is there any noticeable change in Gate-Cathode voltage of the SCR if the heater is switched on?
saaluc:
--- Quote from: timeandfrequency on December 27, 2024, 05:49:38 pm ---...
--- End quote ---
--- Quote from: inse on December 29, 2024, 03:03:12 pm ---Are the LEDs back on again?
Are the wire connections between the two boards OK?
Is there any noticeable change in Gate-Cathode voltage of the SCR if the heater is switched on?
--- End quote ---
The wire connections between the two boards are OK.
Once again I did continuity test on the On/Off switch. It failed, that is, while pushing the button there was no continuity beep. (The other two switches, Up switch and Down switch, passed the test.)
I also did voltage test on the On/Off switch. It failed, that is, on its input side there was 4.85 VDC but while pushing the button, on its output side there was only 0.7 VDC. (The other two switches, Up switch and Down switch, while pushing the button had 4.85 VDC on both sides.)
Other than replacing the On/Off switch or using a piece of wire to connect the input and output of the switch, what else can be done to the switch for testing the circuit?
timeandfrequency:
Hi saaluc,
If the on/off switch is defective, replacement is the best solution.
Using a wire does not correspond to the original behavior: it is a momentary switch. A wire would close the circuit permanently.
And holding the wire by hand to imitate the switch is not safe at all : the whole board is connected to the mains, so handling it is a bad choice.
Check if this one matches with the defective part. The height of the button has the same importance than the other dimensions.
saaluc:
--- Quote from: timeandfrequency on January 10, 2025, 01:37:52 pm ---Hi saaluc,
If the on/off switch is defective, replacement is the best solution.
Using a wire does not correspond to the original behavior: it is a momentary switch. A wire would close the circuit permanently.
And holding the wire by hand to imitate the switch is not safe at all : the whole board is connected to the mains, so handling it is a bad choice.
Check if this one matches with the defective part. The height of the button has the same importance than the other dimensions.
--- End quote ---
What I meant by "using a piece of wire to connect the input and output of the switch", was connecting the input and output momentarily.
These switches operate with 4.85 VDC. Are they too have 220VAC? If yes, how? If no, how are they dangerous?
inse:
Please, Saaluc for the safety of yours and anyone using the hair straightener, throw it away.
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