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Replace Resistor on Oster Trimmer

JSR

Aug 3, 2023
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Aug 3, 2023
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Have an Oster 76988 Trimmer that stopped working out of the blue. Dissembling it revealed a busted resistor. Naturally, the resistance is unknown and no schematics are available.

I am out of practice but made a rough LT Spice sketch of the board...it's really just AC Power -> Resistor -> Bridge Rectifier -> Motor.

Was not able to measure anything on the resistor. Can someone help me determine the resistance?

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Martaine2005

May 12, 2015
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Could it be a fusible resistor?.
Any colour stripes?
Does the motor have any specs on it?
Show a photo of the board.
 

H2814D

Nov 4, 2017
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Tried to delete this. It won't let me. Martaine has it all. Colors look like black, yellow, brown or black, and white.
Looks like it is the mains line fuse (fusible resistor). What are the rest of the letters on that board? LF-03v????.
 

JSR

Aug 3, 2023
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Aug 3, 2023
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Tried to delete this. It won't let me. Martaine has it all. Colors look like black, yellow, brown or black, and white.
Looks like it is the mains line fuse (fusible resistor). What are the rest of the letters on that board? LF-03v????.
LF-03VC; that is what was underneath the resistor I removed. Thought it would be helpful, but couldn't turn up anything with it.
 

Harald Kapp

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Nov 17, 2011
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Doesn't look like a resistor to me, more like an inductor
1706166355124.png
 

kellys_eye

Jun 25, 2010
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It is an inductor. It should measure 'short circuit' with a test meter (as good as). Doesn't look damaged to me which leaves either the rectifier or the motor as the damaged item and given the type of equipment I'd say the motor is dud.

Either way, you need a test meter to check the bits.
 

H2814D

Nov 4, 2017
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A closer look shows what appears to be a broken wire. See the pic. Something caused that plastic shroud to shatter and come off. I do think this is a failed component. I think it was used as a mains line fuse and is shown on the board as LF (Line Fuse?), but it certainly does look like an inductor. There are colors on the shroud that need to be looked at closer for possible resistance/inductance clues.

Can you post a picture here of the other side of that circuit board?
 

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