It is currently Tue Jun 27, 2017 2:36 am

All times are UTC + 10 hours [ DST ]




Post new topic Reply to topic  [ 7 posts ] 
Author Message
 Post subject: a query for the electronics boffins.
PostPosted: Sat Mar 16, 2013 1:59 pm 
Offline
Founding Board Member | Master of Acrylic
User avatar

Joined: Sat Sep 25, 2010 4:07 pm
Posts: 1246
i have purchased a pioneer cdj player (dj type) and the seller did not state it was the 110v version, and they included a step down transformer. well fine, but when i plug it in, no power. the red light goes on on the transformer, but the player does not 'boot up' i have a second 240v one that i got elsewhere that functions well, so it isnt my imagination.

they said it was working perfectly last weekend when they used it..... :mad:

after doing a bit of "item not as described" paypal messages etc... she is starting to get fired up (the seller)

the cdj draws 28w and the step down she supplied has a 30w max. is that an issue? she said to try another adapter/transformer, how many watts transformer should i get? they sell mostly 100 - 200w ones on crime bay, will that hurt it?


cheers sisters

_________________
When I was young i wanted to be an astronaut ... ended up a space cadet


Top
 Profile  
 
 Post subject: Re: a query for the electronics boffins.
PostPosted: Sat Mar 16, 2013 3:41 pm 
Offline
Founding Board Member | Master of Acrylic
User avatar

Joined: Sat Sep 25, 2010 4:07 pm
Posts: 1246
found the problem...

the power fuse was blown on the cdj... whoever the bright spark was that serviced it last installed a 1.6A250V fuse instead of a 1.6A125V fuse...

does anyone know if that matters?

_________________
When I was young i wanted to be an astronaut ... ended up a space cadet


Top
 Profile  
 
 Post subject: Re: a query for the electronics boffins.
PostPosted: Sun Mar 17, 2013 9:55 am 
Offline
Founding Board Member
User avatar

Joined: Sat Sep 25, 2010 5:42 pm
Posts: 505
OK, first question about wattage of transformers.

Having more shouldn't be an issue. As you've stated, the one that came with it was a 30W max, when it was drawing 28W. Think of it like a battery, you need 28W, it can supply up to 30W. The even larger ones should work fine as well. The CD player will only draw what it needs, so more is ok, less is not.

As for the fuse...
The ratings you described is what it can handle. Once that rating is exceeded, usually because of a short in the system, it blows to protect any further damage. So the 250V one is actually stronger than the 125V one and is less likely to blow.

Essentially, from what you have described, the correct components have been used.

Have you replaced the fuse and tried firing it up again?


Top
 Profile  
 
 Post subject: Re: a query for the electronics boffins.
PostPosted: Sun Mar 17, 2013 12:15 pm 
Offline
Founding Board Member | Master of Acrylic
User avatar

Joined: Sat Sep 25, 2010 4:07 pm
Posts: 1246
yeah i replaced the fuse and it fired up. im just a bit worried that the fuse got blown, and what may of caused it. i was thinking maybe someone tried to plug it in without the transformer...

cheers Krudds

_________________
When I was young i wanted to be an astronaut ... ended up a space cadet


Top
 Profile  
 
 Post subject: Re: a query for the electronics boffins.
PostPosted: Sun Mar 17, 2013 8:25 pm 
Offline
Founding Board Member | Admin
User avatar

Joined: Sat Sep 25, 2010 4:04 pm
Posts: 2339
Location: The 80s baby!
krudds you should be looking at exploring becoming an electronics engineer, you certainly know your stuff! I feel all special when I test a power supply with my multimeter but your knowledge seems vast!

_________________

"If I can't build a time machine then I'll build machines from back in time." - Me

A.W.R.T.G.U.M.A Sisterhood
Founding Member


Top
 Profile  
 
 Post subject: Re: a query for the electronics boffins.
PostPosted: Sun Mar 17, 2013 10:29 pm 
Offline
Founding Board Member
User avatar

Joined: Sat Sep 25, 2010 5:42 pm
Posts: 505
Thanks for the kind words BGH, but i've forgotten more than what i know now. That stuff is basic electronics 101. ;-)


Top
 Profile  
 
 Post subject: Re: a query for the electronics boffins.
PostPosted: Tue Mar 19, 2013 2:55 am 
Offline
Founding Board member | Mod
User avatar

Joined: Sat Sep 25, 2010 6:39 pm
Posts: 1522
Location: Melbourne, Australia
What Krudds said on wattages. He's the man! :mrgreen:

Now my spill...

As far as I am aware, I don't think the voltage makes a huge deal, just the amps rating. I've used straight 10 amp glass fuses on both 12v and 250v without issues.

That said, I wouldn't risk it though, just in case but check whether fuse should be fast or slow blow. Use a fast blow if unsure.

The difference being that fast blow fuses will blow on the slightest amp draw, whereas a slow blow will take short bursts of irregularties in amp draw but blow if applied to circuit for an extended period.

Fast blow fuses are generally a flat bimetal or single strand wire, Slow blows look more like a halogen globe wire (coiled) or ceramic coated.

My electronics 101 mainly relies on touch it with your fingers and see what happens (I was a fuse in my last life)

_________________
Life is a waste of time and time is a waste of life, so waste your time and have the time of your life!

Sisterhood Forever!


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 7 posts ] 

All times are UTC + 10 hours [ DST ]


Who is online

Users browsing this forum: No registered users and 1 guest


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Jump to:  
cron
Powered by phpBB © 2000, 2002, 2005, 2007 phpBB Group
Skin by Lucas Kane
Localized by MaĆ«l Soucaze © 2010 phpBB.fr