Trains.com

MTH QSI ac buzz

778 views
3 replies
1 rating 2 rating 3 rating 4 rating 5 rating
  • Member since
    April 2003
  • 305,205 posts
MTH QSI ac buzz
Posted by Anonymous on Wednesday, July 6, 2005 3:36 PM
I just returned from the local shop where I saw a TRO standard gauge 4-4-4 electric loco that is absolutely beautiful!

After helping put a fresh battery in it we gave it a test run. Operation was normal except for a 60 cycle buzz from the speaker. Turning the volume pot full CCW did not eliminate the buzz. Turning the Z1000 off eliminated the buzz and a normal shutdown occurred.

Anyone have any info on this problem? Since there is no MTH warranty on this QS1 consignment loco I hesitate to assemble a nice standard gauge set with a potentionally defective loco. Everything that came in on consignment looks mint in appearance.

Thanks for any help.

Tony
  • Member since
    February 2004
  • From: Rolesville, NC
  • 15,416 posts
Posted by ChiefEagles on Wednesday, July 6, 2005 6:47 PM
There is a guy that goes by northern1. If I am not mistaken he is a QSI sales person or was. He is very knowledgable on QSI. Have not seen him around here lately. Might try posting this on Model Train Journal forum. I think he visits there. http://modeltrainjournal.com/phpBB2/viewforum.php?f=2&sid=3e6c2e2fe712a12cd91565a7602af541

 God bless TCA 05-58541   Benefactor Member of the NRA,  Member of the American Legion,   Retired Boss Hog of Roseyville Laugh,   KC&D QualifiedCowboy       

              

  • Member since
    April 2003
  • 305,205 posts
Posted by Anonymous on Wednesday, July 6, 2005 10:08 PM
tonyh,

The problem is usually caused by the voltage regulator on the lower DCRU board. The regulator can be replaced if you're handy with a soldering gun.

There are many of these boards available since the PS2 upgrade kit has replaced them. You can probably buy a used one for about $25-$30.

Hope this helps,

*** Teal
  • Member since
    April 2003
  • 305,205 posts
Posted by Anonymous on Thursday, July 7, 2005 9:46 AM
Tony,

It may also be the wave form of the Z1000 that is causing the buzz. You might try it with a Z4000 or a post war (not a modern) ZW.

Join our Community!

Our community is FREE to join. To participate you must either login or register for an account.

Search the Community

FREE EMAIL NEWSLETTER

Get the Classic Toy Trains newsletter delivered to your inbox twice a month