• TalkBass has been independent since 1998. Add your voice.
    Create a free account to reply to discussions, view embedded media, and browse with fewer display ads.
    Join free Log in
    Want zero display ads or expanded classifieds tools? Compare plans.

Find the fuse in my Ibanez Promethean solid state amp

B

belzebass

Feb 21, 2012
305
78
#1
Hello all,

I have a Ibanez Promethean P3110 bass combo.
It was working fine for years, but last week when I was setting up for a gig it broke down.
I haven't noticed that all knobs (including drive and master volume) were turn on to the maximum (my kid has played with them) and the power toggle was on ON.
When I plugged it into the wall socket, there was a loud pop, and then nothing more.
There is no more sound coming out of the amp. The "power on" LED turns on correctly, the On/Off switch works correctly (as witnessed by the On LED), but no sound whatsoever.
There was absolutely no burning smell or smoke in the accident.

I suspect that the there is a blown fuse between the amp and the power amp, or the power amp and the cab since the ON LED on the amp part work correctly, but maybe it's something else.

I took it apart hoping to find the fuse and can't find it. Anyone here who can help me locate it?

I made some picture of the insides of the amp.

Any ideas where the potential fuse is?

Thank you all!
 

Attachments

  • 20260324_114757.jpg
    20260324_114757.jpg
    903.6 KB · Views: 20
  • 20260324_114808.jpg
    20260324_114808.jpg
    949.6 KB · Views: 21
  • 20260324_114636.jpg
    20260324_114636.jpg
    808.8 KB · Views: 21
  • 20260324_114621.jpg
    20260324_114621.jpg
    849.3 KB · Views: 19
  • 20260324_114804.jpg
    20260324_114804.jpg
    994.2 KB · Views: 22
  • 20260324_114801.jpg
    20260324_114801.jpg
    969.9 KB · Views: 19
  • 20260324_114616.jpg
    20260324_114616.jpg
    905.3 KB · Views: 16
  • 20260324_114558.jpg
    20260324_114558.jpg
    997.7 KB · Views: 18
  • Wow
Reactions: DJ Bebop and NitroBobby
Sort by date Sort by votes
#8
Your amp has MUCH more serious issues.

Making the assumptions you are making tells me that you should stop working on it now (before you hurt yourself) and either find a truly qualified tech, or determine that it's not worth the cost of repairing (if even possible).
 
  • Like
Reactions: Bassdirty, 96tbird, 60bass and 6 others
Upvote 0 Downvote
#14
I had to double check this wasn't click bait. Haha. Yeah friend. I would just buy a new amp. I admire anyone willing to troubleshoot something but some stuff is just left for the pros and I don't think it would be worth the money. I feel your pain with kids touching the knobs. I had to put a note on my heads to check levels first after killing a packed venues ear drums… I also had to start marking where I like my knobs. My kids are great but they are kids and they get curious.
 
  • Like
Reactions: NitroBobby
Upvote 0 Downvote
#15
With recent amps, the main fuse is often located at the power inlet. In the picture below, this fuse is located under the cover where it's written Furutech :

1774391929197.jpeg
´


Also, this amp doesn't seem to be very old as it uses a SMPS (Switch Mode Power Supply) which is very easy to replace and maybe still available from the manufacturer. This is the board with those burnt resistors. It usually requires removing a few screws and unplugging a few connectors and reinstalling the new one.
 
  • Like
Reactions: BassDaddySky
Upvote 0 Downvote
#16
agedhorse said:
Huh?
Click to expand...
It's a play on "Promethean" and Prometheus, and the legend of Prometheus getting his liver eaten each day by an eagle as punishment for giving fire to humans. His liver grew back every night, so he had to endure the torture daily forever. The modern "pain equivalent" of such torture might be going to Hell where one's punishment for having been in a Satanic rock band is having to play a pawn shop Russian bass guitar through a Super Reverb with one dead 6L6 until the end of time, while watching endless reruns of "2 Broke Girls" with the volume dimed, on a vacuum tube TV with a misadjusted horizontal hold control.
 
  • Like
  • Haha
  • Sad
Reactions: DJ Bebop, el jeffe bass, T748 and 7 others
Upvote 0 Downvote
#17
eniac said:
It's a play on "Promethean" and Prometheus, and the legend of Prometheus getting his liver eaten each day by an eagle as punishment for giving fire to humans. His liver grew back every night, so he had to endure the torture daily forever. The modern "pain equivalent" of such torture might be going to Hell where one's punishment for having been in a Satanic rock band is having to play a pawn shop Russian bass guitar through a Super Reverb with one dead 6L6 until the end of time, while watching endless reruns of "2 Broke Girls" with the volume dimed, on a vacuum tube TV with a misadjusted horizontal hold control.
Click to expand...
Didn't put 2+ 2 together here…
 
  • Like
Reactions: DJ Bebop and DeepHz
Upvote 0 Downvote
#18
Gervais Cote said:
With recent amps, the main fuse is often located at the power inlet. In the picture below, this fuse is located under the cover where it's written Furutech :

View attachment 7459918´


Also, this amp doesn't seem to be very old as it uses a SMPS (Switch Mode Power Supply) which is very easy to replace and maybe still available from the manufacturer. This is the board with those burnt resistors. It usually requires removing a few screws and unplugging a few connectors and reinstalling the new one.
Click to expand...
First, if the LED turns on, it can't be the primary fuse.

Second, that's a custom SMPS combined with a class D amplifier, and my sources say they haven't been available for quite some time.

Third, they are generally very difficult to repair, even with experience in non-linear circuits.
 
  • Like
Reactions: Bassdirty, DeepHz, Bassic_desires and 1 other person
Upvote 0 Downvote
#19
agedhorse said:
First, if the LED turns on, it can't be the primary fuse.

Second, that's a custom SMPS combined with a class D amplifier, and my sources say they haven't been available for quite some time.

Third, they are generally very difficult to repair, even with experience in non-linear circuits.
Click to expand...
I know that "maybe still available from the manufacturer" rarely happens ! 😁 Just like if we would need to buy the spare parts when they are still available, in other words, within the first years after the purchase.
 
  • Like
Reactions: WRM
Upvote 0 Downvote
#20
Gervais Cote said:
I know that "maybe still available from the manufacturer" rarely happens ! 😁 Just like if we would need to buy the spare parts when they are still available, in other words, within the first years after the purchase.
Click to expand...
It depends on the manufacturer... we still stock almost all of the parts used in 25 years of Genz Benz production, all models have been out of production for over 12 years now. Mesa also stocks a LOT of parts for legacy models going back 30+ years. Each manufacturer is different.
 
  • Like
Reactions: DeepHz and WRM
Upvote 0 Downvote

Latest posts

Top Bottom
Back