Users may not create topics, posts, or private messages containing or relating to the following material (especially pertaining to Motorola copyrighted software, unless you want Motorola to come along and shut this site down):

  • Listing for sale or trade of, or links to sites offering for sale or trade of, or giving away, Radio
    Service Software (RSS) or Customer Programming Software (CPS)
  • Profanity, pornography, defamation, or slanderous remarks directed towards any individual or entity
  • Commercial advertising (except in the Batboard Vendors forum, as approved by the Admin/Mod Staff)
  • Any other items which may be deemed as offensive

If any topics, posts, or private messages containing or relating to the aforementioned material are brought to the attention of the Admin/Mod Staff, they will be deleted.

Additional FAQ items appear here in Forum Rules. Please review them for posting guidelines and further clarification.

XPR6550 Loud Uncontrolled Squeal

Moderator: Queue Moderator

User avatar
Posts: 200
Joined: Sat Aug 12, 2006 12:10 pm
What radios do you own?: XTS2500i III, AS III
Location: New York, NY

XPR6550 Loud Uncontrolled Squeal

Postby gatekeep » Fri Jan 06, 2017 8:40 am

I have a few NOS dealer trade in XPR6550's on my bench that intermittently will (without warning) begin uncontrollable loud squealing from the speaker after receiving analog traffic.

Anyone run into this sort of issue? Some quick research seems to indicate this could be the result of a faulty volume pot or bad solder joints at the volume pot.
- Bryan
"So the best solution is to paint them to blue color and throw them to the sea?" in reference to MTS2000 F01/93.

Posts: 69
Joined: Sat Mar 19, 2011 6:27 am

Re: XPR6550 Loud Uncontrolled Squeal

Postby TreyH » Sat Jan 21, 2017 4:43 am

Are they on firmware 1.12.17? There's talk of a bug in that firmware version causing that issue. I've experienced it on some of mine but that's been on a digital channel.

User avatar
Posts: 30
Joined: Fri Sep 04, 2015 9:02 am
What radios do you own?: an unhealthy amount of them

Re: XPR6550 Loud Uncontrolled Squeal

Postby W3AXL » Sat Jan 21, 2017 6:58 am

The "squeal of death" is a known issue in older firmware and the solution is to upgrade to the latest version. A decent amount of our radios had the problem and Motorola originally didn't know what was going on. Eventually they just told us that a firmware upgrade should fix the problem, which it seems to have done.

Return to “MotoTRBO Portables and Mobiles (4xxx/6xxx) 1.0 Series Subscribers”

Who is online

Users browsing this forum: No registered users and 1 guest