Bad light switch


  #1  
Old 02-03-18, 03:20 PM
Norm201's Avatar
Member
Thread Starter
Join Date: Sep 2013
Location: United States
Posts: 10,945
Received 715 Upvotes on 636 Posts
Bad light switch

I have one of those lighted magnifying adjustable fluorescent lamps. It uses the type of switch that you must hold down for the lamp to warm-up before letting go. Today the switch outer body shorted against the lamp frame. Sparks flew. Taking apart the lamp no visible signs of damage to the switch. But you can see a slight dark spot on the frame where the short took place. The switch shows no signs of damage or scorching.

This is a replacement switch that I installed many years ago. The switch seem fine, but is there any way of testing the switch using a VOM meter? I get continuity with the two black leads weather the button is pressed or not. I get no continuity with the blue wires with or without the button being pressed or with any combination with the black leads and/or button. BTW... what is the correct term for this type of on/off switch?


<img src="https://i.imgur.com/9k9UCnB.jpg" width="161" height="81"/>

<img src="https://i.imgur.com/yrXjGur.jpg" width="161" height="81"/>

<img src="https://i.imgur.com/nBnKA9P.jpg" width="161" height="81"/>

<img src="https://i.imgur.com/0BqOIOC.jpg" width="161" height="81"/>
 
  #2  
Old 02-03-18, 03:26 PM
XSleeper's Avatar
Group Moderator
Join Date: Dec 2004
Posts: 27,007
Received 1,899 Upvotes on 1,705 Posts
Isnt it just a standard push button switch?
 
  #3  
Old 02-03-18, 03:36 PM
Norm201's Avatar
Member
Thread Starter
Join Date: Sep 2013
Location: United States
Posts: 10,945
Received 715 Upvotes on 636 Posts
No. You must hold it until the bulb glows then release it. It does not have a push on click or click off feel to it.
 
  #4  
Old 02-03-18, 03:54 PM
A
Member
Join Date: Jan 2013
Location: U.S.A.
Posts: 1,902
Received 73 Upvotes on 66 Posts
Sorry Norm, I was going to be a nice guy, but guess not today. I have one like that, probably as old, and assume the fluorescent bulb and wiring is the same, EXCEPT that mine has an incandescent bulb in place of a magnifier. So I thought that I would just open it up and get you some readings, but it looks like both sockets need to come out in order to open the housing, and at something like 50 years old I'm sure you understand the reason I'm dragging my feet a bit. If nobody answers it for you I'll see how brave I feel tomorrow.
 
  #5  
Old 02-03-18, 04:20 PM
Norm201's Avatar
Member
Thread Starter
Join Date: Sep 2013
Location: United States
Posts: 10,945
Received 715 Upvotes on 636 Posts
Thanks Pedro! LOL.

I'm going to replace the switch no matter. But I was concerned as to how the short was made. Like I said no visible signs of damage on the switch. The sparks scared me. If memory serves me correctly the original switch just would no longer work, so I replaced it this one. Had to buy it from an electrical supply house.
 
  #6  
Old 02-03-18, 04:25 PM
XSleeper's Avatar
Group Moderator
Join Date: Dec 2004
Posts: 27,007
Received 1,899 Upvotes on 1,705 Posts
I think this may be a replacement switch that would work. 40 watt, 4 wire florescent starter switch. https://www.ebay.com/i/152833304268?rt=nc

Or Google "Liviton 382" for more choices.
 
  #7  
Old 02-03-18, 04:42 PM
PJmax's Avatar
Group Moderator
Join Date: Oct 2012
Location: Jersey
Posts: 64,580
Received 3,878 Upvotes on 3,476 Posts
That will work X.

That is basically two switches in one. One is an on-off that toggles every time you push the button and the other one is a momentary contact every time the button is pushed in.

I was looking on eBay and I see them listed for $50- $100. WTH.... what are they gold.
 
  #8  
Old 02-04-18, 01:04 PM
Norm201's Avatar
Member
Thread Starter
Join Date: Sep 2013
Location: United States
Posts: 10,945
Received 715 Upvotes on 636 Posts
Xsleeper, PJ,... Thanks for the info.

Still would like to know what made it short out.

I agree the switches seem a bit pricey. Not worth replacing. More economical to buy a new lamp. They seem to range from about $25 (fluorescent) to $70 (LED) for what I'm looking for. Some of them refer to a term "90 SMD LED". What does that mean? I'm looking for lumens and only a few show that measurement at about 450 to 500.

Upon further checking I think it means surface mounted LED's.
 
  #9  
Old 02-06-18, 11:18 AM
Norm201's Avatar
Member
Thread Starter
Join Date: Sep 2013
Location: United States
Posts: 10,945
Received 715 Upvotes on 636 Posts
Bought a new light at Harbor Freight. $35.00
 
 

Thread Tools
Search this Thread
 
Ask a Question
Question Title:
Description:
Your question will be posted in: