A Dead Wax Melting Device Repaired and Maintained
This device was brought to me for repair. It is a wax melting device and it was completely dead. According to the customer she saw smoke coming out of the device and then it went dead.
It is a very cheap device and according to me it is not worth the fixing but the customer wanted to be fixed so here we go.
I powered the device and the on LED light did not come on indicating a problem here so I took it apart to find out the fault.
The customer said there was smoke coming out
and I could see the reason for it.
I took the top off and right away I took the white cable off and replaced it with a new cable.
It can be seen where the cable were connected; yes it is a simple fix and I wish all the repair are like it (LOL).
I powered on the device and right away I could see the red led light coming on indicating a good working device. I felt the heating plate (before it gets hot of course) and I could feel the heat increasing inside.
It is a simple fix but I look at it this way that I was able to help out a customer and to that I could say
Mission Accomplished.
This article was prepared for you by Waleed Rishmawi, one of our ‘Master Authors’ and currently working in the Bethlehem area of Palestine repairing electrical and electronic equipment.
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Note: You can check his previous article on A Dead Electrical Bed Controller Brought Back To Life
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Albert van Bemmelen
February 24, 2024 at 3:08 pm
Without a working cable it always is a dead end (lol)!
Waleed Rishmawi
February 25, 2024 at 1:21 am
Albert: indeed. Have a blessed day
Albert van Bemmelen
February 25, 2024 at 3:26 pm
PS: If we want to know what the maximum voltage is that a small resistor can cope with we apparently use this formula √(PxR).
Which for instance tells us that a small 1812 1% Smd Chip resistor 4.5 x 3.2 mm size with value 10Mega-ohm 0.75Watt, is safe to use upto about 2783,6V.
Albert van Bemmelen
February 25, 2024 at 11:20 pm
PS2: Although more high ohmic resistors in series would be advisable for HV safety we could better use two 5Mega-ohm 1% resistors in serie instead. But in this case those seem not to exist. Why for my new to build project, this 1KV HV grafical curve tracer tester, See here =>
https://www.printables.com/model/347158-high-voltage-1000v-isolation-tester-1kv-curve-trac ,
I only use one 1812 10Mega-ohm resistor instead. Which was the biggest smd resistor I could find. This DIY project is like the fantastic DY294 high voltage component tester but now with a graphical 1.77 inch TFT lcd, that tests semiconductors and other components safely upto about 1000V and shows the break-down voltage of diodes, transistors, vdr's, etc. in a real curve. With a safe 0,45 mA max limited short current on its HV output.
AdamS
March 4, 2024 at 6:57 pm
Absolutely not true and that is a very dangerous and misleading assumption. As an example, the datasheet for a Panasonic ERJ Series thick film resistors clearly states that the maximum working voltage is either your equation above or "the Limiting Element voltage stated in the specification table - WHICHEVER IS LESS".
Datasheet here: https://www.farnell.com/datasheets/2883945.pdf
For the 1812 size package in this range the limiting element voltage is 200V, so the resistor should never be used at a voltage higher than that. Increased voltage rating should be achieved by either a correctly rated resistor (special high voltage SMD resistors are available but they are usually bigger than 1812) or a number of resistors in series.
Menahem Yachad
February 25, 2024 at 2:04 am
Waleed,
You will also find open resistors in these types of machines. The manufacturers use low-power resistors, completely unsuited for the use. I replace them with 3W metal oxide.
Waleed Rishmawi
February 25, 2024 at 5:39 pm
Menahem: in this case there was no resistors just a bad power cable. Have a blessed day.
Imoudu.O
February 25, 2024 at 5:01 am
There are lot of poor quality cable carring devices in the market these days, have a nice day.
Waleed Rishmawi
February 25, 2024 at 5:40 pm
Imoudu: yes thete is. Have a blessed day.
Waleed Rishmawi
February 26, 2024 at 2:55 pm
Imoudu: that is why I replaced the whole defected cable with a high standard one and so far no complaint. have a blessed day
Parasuraman S
February 25, 2024 at 7:11 pm
Best fix, thanks to the chances liberally provided by the manufacturers! They feed work to us! Rather agents!
Waleed Rishmawi
February 26, 2024 at 2:56 pm
Parasuraman: thanks man. LOL yes indeed. poor customers though. have a blessed day
Jim
February 25, 2024 at 11:01 pm
Looks like a small tooth hole in the line cord to me.
Nice job Waleed.
Waleed Rishmawi
February 26, 2024 at 2:57 pm
Jim: yes I am becoming a dentist dealing with cavity...LOL. have a blessed day
Tayo
February 25, 2024 at 11:24 pm
Good eye Waleed.
Perhaps the cable was under-rated for the current this device draws?
Or perhaps mechanical stress (bending back and forth) aided to its demise?
Waleed Rishmawi
February 26, 2024 at 2:59 pm
Tayo: I think it is a user issue since the cable was abused because it was bent in many areas. the cable was replace with a high quality one and so far no complaint. have a blessed day
Yogesh Panchal
February 26, 2024 at 12:27 am
Good Job!Waleed
Waleed Rishmawi
February 26, 2024 at 2:59 pm
Yogesh: thanks man. have a blessed day