Fusible resistor replacement - Page 1
Forum section: electronics / repair

author: shahrizan
author_rank: Newbie
timestamp: February 17, 2016, 01:25:34 am
content: Hi fellow EEVblog friends,I have a ceiling fan with remote controlled speed controller. This speed controller is attached to the ceiling fan. It can be controlled via handy-remote control unit.The problem is, it stop spinning last month. The speed controller is receiving input from the remote controller because it still producing sound through its buzzer. I have read several post from several forums and guide to repair ceiling fan that wont spin and decided to replace the capacitor for a try.After replacing the start-capacitor (i believed through my readings that this type of capacitor does not have polarity), and switch it on, the fan still wont spin but after around one minut it spin for a momment. I get this twice.. but after that I heard a pop n some sort of fire/spark come out of the speed controller.Analysing the board, I got TWO component burnt. That TWO component is:1 - Fusible resistor (0.5 Ohm 5% 1W)2 - Diode (1N4007)I can easily replace the diode. But for the fusible resistor.. Its hard to search and find the same component because that fusible resistor is cement/some type of flameproof material coated. The one that I need look like a standard resistor (FKN in the attached image). Can I use the white cement resistor (FSQ) to replace it?

author: Tim F
author_rank: Regular Contributor
timestamp: February 17, 2016, 02:11:08 am
content: really gives new meaning to "get me one of those fkn resistors"You can use the ceramic fusible resistor type if the fusing characteristic is the same. The ceramic type are usually only for 5Watt+ though, which is an unsuitable replacement if the original was 1watt.Given that both the diode and the fusible resistor failed, something else is wrong with the circuit which is causing too much current draw. You need to find and fix that fault before replacing the diode and resistor.

author: lowimpedance
author_rank: Super Contributor
timestamp: February 17, 2016, 02:18:40 am
content: AS Tim said look for the reason the resistor "fused" and prevented a possible fire.Also make sure when the fault is cleared that you use an appropriate rated fusible resistor to maintain the same level of protection as before.Some actual photo's of the deceased parts would useful to see what level of damage occurred and what is actually being used etc.

author: shahrizan
author_rank: Newbie
timestamp: February 18, 2016, 08:44:39 am
content: could it possibly be the starter-capacitor that I've replaced? FYI, I've replaced 1 that connect directly to the fan motor, and another is on the board.. But after the replacement, the fan spin but for under 10 sec only. The cap that connected to the motor rated 2uF but i've mistakenly bought and replaced a 2.5uF starter-cap.. can 0.5uF difference be the culprit?any suggestion on troubleshooting the board?

author: shahrizan
author_rank: Newbie
timestamp: February 18, 2016, 08:54:18 am
content: Quote from: Tim F on February 17, 2016, 02:11:08 amI would not asked if I can easily find the same fusible resistor.. I've asked Token Electronics, but the price were to expensive.. Who knows.. I can get answer from here