Electronics > Repair
What resistor ohm will work better to repair this waterpik?
artvandalai:
The resistor on this waterpik blew. I changed it with the a similar spec 47ohm 2 watt yageo resistor but it still keeps blowing the resistor. Checking with the multimeter the motor, capacitor, diodes, and thermal fuse all checked normal. Will a higher ohm resistor work better? What ohm resistor will work better to repair this waterpik? This video is showing the repair with a 56 ohm resistor
fzabkar:
Was the original resistor a fusible safety type?
https://www.digikey.com/en/product-highlight/y/yageo/fusible-through-hole-resistors
I suspect that there may be carbon dust between the commutator segments. Can the motor be disassembled?
Simmed:
use 2x 100R
or 3x 150R
spread the power
DavidAlfa:
Maybe something is wrong in the mechanical part, overloading the motor?
fzabkar:
Teardown:
https://newscrewdriver.com/2022/07/11/waterpik-wp-150w-teardown/
New motor (DF315XLG) for ~US$10:
https://www.aliexpress.com/item/1005005779645234.html
Rating of Waterpik is 120V, 16.4W.
Current draw is ...
I = 16.4 W / 120 V = 0.137 A
Dissipation in resistor is ...
P = I^2 x 47 ohms = 0.88W
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