1 Babyliss Hair clipper Circuit board repair
Hi,
I'm currently learning to repair electronics.
So my actual project is to repair a hair clipper (Babyliss Ref E709E).
I test with a multimeter every components (Electric motor is 2.4V DC). The failure comes from the Resistance 1 (R1).
As you can see on the picture, I can't read the ohm value. I looked online for similar hair clipper schematic, and some of them report a value of 2 Ohms.
Not sure about that, I recreated the circuit board in https://falstad.com/circuit/circuitjs.ht...
With R1 value of 2 Ohms, it looks like it is working.
I would like to know if my diagnostic and schematic recreated in Falstad are right?
Thank you.
Is this a good question?
Score
0
I think it is more likely to be an NTC thermistor rather than a normal resistor.
by honakrisi
After a few search, like here:
- https://newscrewdriver.com/2023/10/10/co...
- https://newscrewdriver.com/2023/10/09/re...
Different brands of hair clipper uses R1 as a resistor. Also, I have another circuit board with R1 as a resistor.
by Imladris
The first schematic looks similar to yours and R1 is 20 Ohms. It would be good to know why the component failed though…
by honakrisi
It was physically in contact with the battery. Maybe it's a design flaw so the hair clipper breaks and the user has to buy a new one :/
by Imladris
What's the state of the two batteries? NMH and nicad batteries have different charging requirements and a short life. If you research rechargeable battery specs, you'll find something like slow/fast charging rates in milliamps. Charging (C-rate) like 0.5C is half the battery milliamp rating; a 2200mah rated battery may be best charged at a slow rate to prevent overheating; 0.3C-0.5C or 660ma@0.3C. The resistor may be a current limiter along with the diode wired to the battery. NMH/nicad batteries do not hold their charge compared to lithium ion types and have less capacity. They have less recharging cycles too, wearing out sooner.
by F Dryer