turntable power problems - diyAudio
Go Back   Home > Forums > Source & Line > Analogue Source

Analogue Source Turntables, Tonearms, Cartridges, Phono Stages, Tuners, Tape Recorders, etc.

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 August 2006, 04:51 AM   #1
adamt is offline adamt  Australia
diyAudio Member
 
Join Date: Sep 2005
Default turntable power problems

I have a Heybrook TT2 turntable. Whenever I switch it on, it trips the safety switch in my fuse box which has a 30mA rating (standard for Australia). All power points in my house are connected to this switch.

When I operate through the oven point (which is not connected to the safety switch) the turntable works fine. Powers on and off without fault.

My local hifi shop inspected it and it worked fine, and they were unable to detect any faults in the operation, or in the motor (they dont have a safety switch installed in their premises).

Other than a seperate wall power point for my turntable, is there anything else I could do to make it work with the safety switch in place?

Or is it something more serious like a motor problem?

Any help is greatly appreciated.
  Reply With Quote
Old 16th August 2006, 05:07 AM   #2
singa is offline singa  Singapore
diyAudio Member
 
Join Date: Apr 2004
Location: near
Send a message via AIM to singa Send a message via MSN to singa Send a message via Yahoo to singa
Default turntable power problems

The 30mA refers to the residual leakage current limit for circuit breaker.Leakage current has to go somewhere,I was told by a professional electrcian,are'nt they all suppose to be?that if your equipment has no grounding that it will trip the breaker if leakage is more than the design limit which in your case is 30mA.

Is your TT power cord a 2 wire type?which means that there's no ground if so convert to 3pin type and add the ground wire to metal chasis of TT and 3pin plug respectively.OR your ground connection is loose/broken?
  Reply With Quote
Old 16th August 2006, 05:11 AM   #3
rpapps is offline rpapps  Antarctica
diyAudio Member
 
Join Date: Jul 2004
Location: nowhere of interest
Hi Adamt
Does it trip even when it's not connected to anything else?
It's possible that there is a capacitor inside from mains active to earth for noise filtering which is either leaky or of a value which would allow more than 30 mA ground current (0.39uF or greater).
If you are confident, take a look and remove the capacitor if present and try again.

BTW safety switches work by detecting an imbalance between the active and neutral currents, indicating a path to ground.
So if there's no ground, they wont trip.
Cheers
Rob
  Reply With Quote
Old 16th August 2006, 10:31 AM   #4
adamt is offline adamt  Australia
diyAudio Member
 
Join Date: Sep 2005
Default Problem solved!

Hi friends

thanks for your help.

It turns out it was a poorly wired circuit board. The power cord coming into the motor board had the ground wire soldered in the neutral outlet. THe power cord at the plug end had the same neutral wire connected to the ground. Hence the tripping of my safety switch.

Why the factory would solder a green wire with yellow stripe into the 'neutral' outlet and a brown wire into 'ground' has me beat....

Its time to spin some discs!!
  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
Oracle motor/controller problems - DIY turntable g-horn Analogue Source 26 12th January 2013 11:50 PM
Turntable Power Supply DIY needed promitheus Analogue Source 14 21st August 2006 12:02 PM
Crystal Controlled Turntable Power Supply peranders Analogue Source 36 31st May 2004 07:33 AM
Turntable Power Supply passing thru Analogue Source 3 23rd December 2003 09:59 PM


New To Site? Need Help?

All times are GMT. The time now is 03:57 PM.


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