Pioneer amplifier voltage selector - diyAudio
Go Back   Home > Forums > Amplifiers > Power Supplies

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 16th November 2011, 01:43 AM   #1
diyAudio Member
 
Join Date: Nov 2011
Default Pioneer amplifier voltage selector

Hi all I was just after a bit of advice.
I have a pioneer vsx-521k amplifier and I want to change it from 110v to 240v.
I have taken the power supply out and on the board there is a spot for a switch, however the switch is not on the board and instead there is jumper wires connecting the terminals.
Does anyone know if I can re-arange the jumper wires to convert it to 240V???
Thanks,
Jay
  Reply With Quote
Old 16th November 2011, 03:05 AM   #2
diyAudio Member
 
Join Date: Nov 2011
IMAG0665.jpg

This is a photo of the power board.
as you can see i put a jumper from the center terminal of the selector to the R/H terminal. it was originally from the center to the L/H terminal. Which was achieved by jumping j302 and 301.
  Reply With Quote
Old 16th November 2011, 05:03 AM   #3
diyAudio Member
 
Join Date: Nov 2011
Alternatively would anyone have a schematic of the power board or service manual?
  Reply With Quote
Old 16th November 2011, 08:37 AM   #4
Mooly is offline Mooly  United Kingdom
diyAudio Moderator
 
Mooly's Avatar
 
Join Date: Sep 2007
Your piccy appears to show just an auxilliary power supply that will be used to keep the microprocessor and remote receiver active when in standby.

So I think there is a lot more you need to check.

Does the main amplifier power supply use a normal mains transformer or does it use an SMPS type supply ? That also has to be altered for 240 vac. An SMPS type may need no adjustment (but you MUST check for sure). A linear supply certainly will need adjustment... and that may not even be possible depending on the original transformer fitted and its intended market.

I would advise caution with this as you risk writing the unit off if you get it wrong.
__________________
-------------------------------------------------------
Installing and using LTspice. From beginner to advanced.
  Reply With Quote
Old 16th November 2011, 09:32 PM   #5
diyAudio Member
 
Join Date: Nov 2011
Thanks Mooly, yes there is a second transformer as seen in this photo.
One of the power inputs to this transformer comes directly from the AC lead and the other comes from the power selector terminal on the power circuit board.
With 110V input, the voltage across the centre and L/H posts of the voltage selector is 86V, and across centre and R/H is 44V.
That's the reason I thought it might be as easy as changing the jumper wire.
IMAG0667.jpg
  Reply With Quote
Old 16th November 2011, 10:00 PM   #6
diyAudio Member
 
Join Date: Nov 2011
Hello again, is there a way to find out if it is a SMPS or Linear type transformer?
  Reply With Quote
Old 17th November 2011, 08:46 AM   #7
Mooly is offline Mooly  United Kingdom
diyAudio Moderator
 
Mooly's Avatar
 
Join Date: Sep 2007
That's a linear (normal PSU).

What you are looking for (and going off the picture I can't see it) is multiple primary windings to allow voltage selection. All I can see is the blue and black leads from the centre of the transformer bobbin going to what appears to be the mains input feed to the transformer. Which if that is so means its a single voltage winding. All the other wires appear to come from the outer bobbin which are the secondaries.

Equipment like this is aimed at many markets and the small auxilliary PCB does appear to have voltage selection available but that is only for that PCB which may be fitted to all variants. The main transformer looks like it is single voltage only.

What does it say on the rear panel ? Does it specify 110/130/240 etc via adjustment or not.

I think what you are measuring voltage wise is just the voltage across the different primary tappings on the small transformer.
__________________
-------------------------------------------------------
Installing and using LTspice. From beginner to advanced.
  Reply With Quote
Old 17th November 2011, 10:33 AM   #8
diyAudio Member
 
Join Date: Nov 2011
Again thanks heaps for your help. It only has 110V written on the back.
I will buy a better quality step down transformer than the one I have, and hopefully it will work a bit better.
Cheers
  Reply With Quote
Old 18th November 2011, 12:41 PM   #9
Mooly is offline Mooly  United Kingdom
diyAudio Moderator
 
Mooly's Avatar
 
Join Date: Sep 2007
I think that's all you can do tbh

Another long shot idea is to see if the 240 volt tranny is available as an official spares item. If you have a manual it may cover all markets and give part numbers...
__________________
-------------------------------------------------------
Installing and using LTspice. From beginner to advanced.
  Reply With Quote
Old 29th January 2012, 10:18 AM   #10
diyAudio Member
 
Join Date: Jan 2012
Default Did you fix it?

So, I have the same problem, I am from europe and buy the av on usa, I want to change the voltage to eliminate the 500W 220 to 120 v transformer.

Did you fix it?
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Line voltage selector Revox B750 MK II blew up BrianVG Power Supplies 8 4th August 2011 05:03 PM
Pioneer U-24 Program Selector Schematic postcard1 Analogue Source 0 22nd July 2011 09:19 PM
Need help to eliminate a voltage selector rg12 Construction Tips 12 11th September 2010 02:46 PM
Marantz 300DC voltage selector problem. onform Solid State 0 30th May 2008 02:19 AM
NAD 2200 help with line voltage selector mrzoo Solid State 3 24th July 2007 05:43 PM


New To Site? Need Help?

All times are GMT. The time now is 06:58 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2