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No power to JBL sub

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Posted on September 30, 2014 at 19:37:09
Kidomaha
Audiophile

Posts: 92
Location: Indiana
Joined: September 13, 2014
 Hi all:

I picked up a JBL PB12 sub for $20 at Goodwill a while back. When I plugged it in... nothing. I took it apart and found a blown fuse. There is a sticker which reads: "Replace only with fuse with same specs., 250V, 2.0 amp., Type 'T' SLO-BLO." I have replaced the fuse with that type of fuse (except that I've never seen anything specifying "Type T,") and the result is always the same, it blows almost instantly. (And yes, I have made sure that the replacement fuses were "SLO-BLO.") Any suggestions other than the trash? Thanks in advance.
Kerry

 

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RE: No power to JBL sub, posted on September 30, 2014 at 22:59:59
cloudwalker
Audiophile

Posts: 634
Location: central wa
Joined: September 27, 2012
 I had that same problem with a Definitive Tech sub I bought from Goodwill. Here is what I would do...ask JBL (now owned by Harmon I believe) if your fuses are correct...if they are the amp needs repaired. Probably not worth it. Definitive Tech mailed me a few new fuses free...

 

i did a little research.., posted on September 30, 2014 at 23:30:45
cloudwalker
Audiophile

Posts: 634
Location: central wa
Joined: September 27, 2012
 the MSRP new was $250 I believe and it has too many poor reviews I am afraid..many just about like you...

 

RE: No power to JBL sub, posted on October 1, 2014 at 01:01:23
Kidomaha
Audiophile

Posts: 92
Location: Indiana
Joined: September 13, 2014
 Thanks cloud. I realize this thing is not worthy of too much investment attempting to revive it. Thanks for the Harmon angle. I did not know they had purchased JBL. I will check out that idea.
Kerry

 

It could be as simple as a shorted bridge rectifier, posted on October 1, 2014 at 08:57:09
Alpha Al
Industry Professional

Posts: 2958
Location: N. Carolina
Joined: February 16, 2004
Contributor
  Since: December 3, 2015
 That's fairly simple to repair. If the amp has blown output devices, it's probably not worth fixing.

 

RE: It could be as simple as a shorted bridge rectifier, posted on October 1, 2014 at 09:09:23
Kidomaha
Audiophile

Posts: 92
Location: Indiana
Joined: September 13, 2014
 Can you tell me how I would check to see if that is the problem and what to do if it is? Thanks for the info.
Kerry

 

RE: It could be as simple as a shorted bridge rectifier, posted on October 1, 2014 at 12:50:37
Alpha Al
Industry Professional

Posts: 2958
Location: N. Carolina
Joined: February 16, 2004
Contributor
  Since: December 3, 2015
 A bridge rectifier is four diodes in a common package. Between any two leads, you should get a reading like a diode. (high one way, low the other way.

 

Blown Fuse ..., posted on October 5, 2014 at 07:46:42
Bromo33333
Audiophile

Posts: 3502
Location: Ipswich, MA
Joined: May 4, 2004
 When a fuse blows, generally it is something that's hooked up to it that has failed.

When you replaced the fuse and the fuse blew right away, that means for sure something else has blown.

It depends upon how much money and time you want to spend, but considering a similar sub will run from $150-200, it probably isn't designed to be repaired.


====
"You are precisely as big as what you love and precisely as small as what you allow to annoy you." ~ R A Wilson

 

RE: Blown Fuse ..., posted on October 5, 2014 at 15:16:00
Kidomaha
Audiophile

Posts: 92
Location: Indiana
Joined: September 13, 2014
 Thanks Bromo. That's sort of what I figured. I actually thought I had found something much more valuable when I picked this sub up so I thought it was worth the risk of not knowing if/how it would perform. Didn't realize this thing isn't exactly sought after.
Kerry

 

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