Geekzone: technology news, blogs, forums
Guest
Welcome Guest.
You haven't logged in yet. If you don't have an account you can register now.




1520 posts

Uber Geek
+1 received by user: 114


Topic # 191929 21-Feb-2016 12:29
Send private message

I picked up an old Leitz Prado 500 projector yesterday, but unfortunately someone cut most of the cord off of the plug, opening the plug up, there are two very short pieces of wire remaining - one white and  one black. I want to put another cord on to the plug so I can see if the projector works, but which of the wires is positive? Does anyone know?


Create new topic
1756 posts

Uber Geek
+1 received by user: 917


  Reply # 1496533 21-Feb-2016 13:19
Send private message

What sort of plug?

Does it fit in either way round?
If it does it doesn't matter.




Location: Dunedin

5404 posts

Uber Geek
+1 received by user: 2600


  Reply # 1496534 21-Feb-2016 13:34
One person supports this post
Send private message

It's probably over 1/2 century old.  Even if it doesn't matter which is phase and neutral, I'd be careful - pull the thing apart and have a close look at the state of the wiring inside, as from your description it doesn't have an earth.

 

If there's a power switch and/or fuse in the device, that would normally be connected from the phase pin on the plug.  If the bulb is typically for that age one with a centre pin, then that centre pin would normally be phase.  Even if it all looks good, I think I'd first fire it up "gingerly" only on an RCD protected circuit, after at minimum testing for any leakage from either pin to the metal case of the thing, and also look for clues in case it was a 110/120V appliance - not 230V, just in case the fan motor might emit smoke, and the lamp emit one bright short-duration flash.  If there's no external marking to tell you, then the bulb and fan motor may have voltage rating marked on them.  Make sure the fan motor turns freely.

 

I'd have in the back of my mind the thought as to why somebody might have cut off the cord -  that may have well been that they wanted to render it inoperative, as they'd had one of those very uncomfortable and potentially dangerous experiences that unsafe old 230v appliances can give.


 
 
 
 




1520 posts

Uber Geek
+1 received by user: 114


  Reply # 1496547 21-Feb-2016 13:51
Send private message

andrewNZ: What sort of plug?

Does it fit in either way round?
If it does it doesn't matter.

 

 

 

It's this plug, the wire is actually grey, not white, but yes, it plugs in either way round

 

Hopefully the link works

 

http://1drv.ms/1SYVgZ7


20700 posts

Uber Geek
+1 received by user: 4013

Trusted
Subscriber

  Reply # 1496550 21-Feb-2016 14:03
Send private message

Fred99:

 

I'd have in the back of my mind the thought as to why somebody might have cut off the cord -  that may have well been that they wanted to render it inoperative, as they'd had one of those very uncomfortable and potentially dangerous experiences that unsafe old 230v appliances can give.

 

 

Cutting the plug off is normal for appliance disposal where you are not going to test and tag it etc. Part of one of the standards for appliance testing.





Richard rich.ms

5404 posts

Uber Geek
+1 received by user: 2600


  Reply # 1496567 21-Feb-2016 14:26
Send private message

richms:

 

Fred99:

 

I'd have in the back of my mind the thought as to why somebody might have cut off the cord -  that may have well been that they wanted to render it inoperative, as they'd had one of those very uncomfortable and potentially dangerous experiences that unsafe old 230v appliances can give.

 

 

Cutting the plug off is normal for appliance disposal where you are not going to test and tag it etc. Part of one of the standards for appliance testing.

 

 

 

 

Making assumptions is dangerous.  Unless known, then anybody could have cut off that cord for any reason.

 

That projector should be checked by a competent owner (as defined in ECP 50) or electrician before plugging it in.




1520 posts

Uber Geek
+1 received by user: 114


  Reply # 1496588 21-Feb-2016 16:02
Send private message

Fred99:

 

richms:

 

Fred99:

 

I'd have in the back of my mind the thought as to why somebody might have cut off the cord -  that may have well been that they wanted to render it inoperative, as they'd had one of those very uncomfortable and potentially dangerous experiences that unsafe old 230v appliances can give.

 

 

Cutting the plug off is normal for appliance disposal where you are not going to test and tag it etc. Part of one of the standards for appliance testing.

 

 

 

 

Making assumptions is dangerous.  Unless known, then anybody could have cut off that cord for any reason.

 

That projector should be checked by a competent owner (as defined in ECP 50) or electrician before plugging it in.

 

 

 

 

I'm competent, I have wired up new lights, shifted switches etc and had them signed off, plus I have also done an Appliance testing course. I just have never come across black and white(grey) wires on a plug before.. oh and yes, the wiring in the projector is fine and the bulb looks fine too, and it is rated for our voltage and 110v by way of a switch that can be flicked under the fan cover.


3837 posts

Uber Geek
+1 received by user: 1951

Lifetime subscriber

  Reply # 1496600 21-Feb-2016 17:17
Send private message

semigeek:

 

I picked up an old Leitz Prado 500 projector yesterday ...

 

I have to ask - why do you want to use an antique projector?  undecided





Sideface




1520 posts

Uber Geek
+1 received by user: 114


  Reply # 1496603 21-Feb-2016 17:34
Send private message

Sideface:

 

semigeek:

 

I picked up an old Leitz Prado 500 projector yesterday ...

 

I have to ask - why do you want to use an antique projector?  undecided

 

 

 

 

Because it would have been cool to use, I like the old equipment. I still use an old 8mm Film Projector.

 

Anyway, wired up the slide projector, but it doesn't go, so will flick it off.

 

 

 

 


Create new topic



Twitter »

Follow us to receive Twitter updates when new discussions are posted in our forums:



Follow us to receive Twitter updates when news items and blogs are posted in our frontpage:



Follow us to receive Twitter updates when tech item prices are listed in our price comparison site:





News »

CPTPP text and National Interest Analysis released for public scrutiny
Posted 21-Feb-2018 19:43


Foodstuffs to trial digitised shopping trolleys
Posted 21-Feb-2018 18:27


2018: The year of zero-login, smart cars & the biometrics of things
Posted 21-Feb-2018 18:25


Intel reimagines data centre storage with new 3D NAND SSDs
Posted 16-Feb-2018 15:21


Ground-breaking business programme begins in Hamilton
Posted 16-Feb-2018 10:18


Government to continue search for first Chief Technology Officer
Posted 12-Feb-2018 20:30


Time to take Appleā€™s iPad Pro seriously
Posted 12-Feb-2018 16:54


New Fujifilm X-A5 brings selfie features to mirrorless camera
Posted 9-Feb-2018 09:12


D-Link ANZ expands connected smart home with new HD Wi-Fi cameras
Posted 9-Feb-2018 09:01


Dragon Professional for Mac V6: Near perfect dictation
Posted 9-Feb-2018 08:26


OPPO announces R11s with claims to be the picture perfect smartphone
Posted 2-Feb-2018 13:28


Vocus Communications wins a place on the TaaS panel
Posted 26-Jan-2018 15:16


SwipedOn raises $1 million capital
Posted 26-Jan-2018 15:15


Slingshot offers unlimited gigabit fibre for under a ton
Posted 25-Jan-2018 13:51


Spark doubles down on wireless broadband
Posted 24-Jan-2018 15:44



Geekzone Live »

Try automatic live updates from Geekzone directly in your browser, without refreshing the page, with Geekzone Live now.



Are you subscribed to our RSS feed? You can download the latest headlines and summaries from our stories directly to your computer or smartphone by using a feed reader.

Alternatively, you can receive a daily email with Geekzone updates.