Maker Pro
Maker Pro

Rumble 150 power problems

Jackman150

Feb 10, 2023
5
Joined
Feb 10, 2023
Messages
5
Hi, just acquired a Fender Rumble 150 bass amp. I plugged it in the a current limiter, as soon as I power it up the lamp went bright. Oscillating off and on?? Any suggestion as to where I should start? I kind thing it might be a coil in the power supply? there is no sound output.
 

Delta Prime

Jul 29, 2020
1,793
Joined
Jul 29, 2020
Messages
1,793
. I plugged it in the a current limiter
I'll let that one go.
Any suggestion as to where I should start
At the beginning do you know how to read schematics?

I kind thing it might be a coil in the power supply?
You disassembled it.
Do you have access printed circuit board?
Can you confirm this schematic is your unit that you are inquiring about.
If you cannot confirm you must take photos thank you and I'll take it from there!
 

Attachments

  • rumble-150-2010-schematic-rev-b.pdf
    262.3 KB · Views: 6

Jackman150

Feb 10, 2023
5
Joined
Feb 10, 2023
Messages
5
I'll let that one go.

At the beginning do you know how to read schematics?


You disassembled it.
Do you have access printed circuit board?
Can you confirm this schematic is your unit that you are inquiring about.
If you cannot confirm you must take photos thank you and I'll take it from there!
Thanks for the response, Yes I have that same schematic on my computer files. Yes, I can read a schematic.
 

Jackman150

Feb 10, 2023
5
Joined
Feb 10, 2023
Messages
5
I just downloaded a schematic with test points, values. Should I start at test point one and follow along till I find a problem?
 

Jackman150

Feb 10, 2023
5
Joined
Feb 10, 2023
Messages
5
Going off line, will check back tomorrow for responses, thanks Delta Prime.
 

Delta Prime

Jul 29, 2020
1,793
Joined
Jul 29, 2020
Messages
1,793
I just downloaded a schematic with test points, values. Should I start at test point one and follow along till I find a problem?
Do you have a combo unit one horn and a speaker?
 
Last edited:

Delta Prime

Jul 29, 2020
1,793
Joined
Jul 29, 2020
Messages
1,793
See you tomorrow. Do not make any measurements put the multimeter away for now.
Do not apply power to the unit. Unplug it from the wall. Unscrew the case of the unit to gain access to the printer circuit board.
Do not put your hands on any part of the printer circuit board. Do not touch anything.
Do a quick visual inspection.
Make sure the jumpers for the line voltage selection matches your mains either 230VAC or 115VAC. Do not touch the jumpers.
Inspect the components capacitors should not be bulged , or leaking. Anything unusual should just jump right out at you.
Look for discoloration on the PCB itself. In fact if you could take a couple photos Component side , only because I'm not there I need to see what you're looking at.We will go from there.
 
Last edited:

Martaine2005

May 12, 2015
4,888
Joined
May 12, 2015
Messages
4,888
I don’t think that internal 15” has the horn!.
It still has an impressive output though..
Sounds like the power supply is trying to come up. What bulb are you using?.

Martin
 

Delta Prime

Jul 29, 2020
1,793
Joined
Jul 29, 2020
Messages
1,793
Fender Rumble 150 bass amp. I plugged it in the a current limiter, as soon as I power it up the lamp went bright
Take a photo of your setup.
You probably destroyed your own amp.
I like to go perhapsing around with the best of them but it is vital, do you have a combo unit or a single head unit. You're asking for help on a procedural based troubleshooting technique. The above question is asked as a process of elimination.
There is no guessing involved. That is probably what got you in trouble in the first place.
 
Last edited:

Delta Prime

Jul 29, 2020
1,793
Joined
Jul 29, 2020
Messages
1,793
Correction: In post (# 7 )
Misspelling of (printed
Circuit board) . "Twice even".
My apologies. I normally do it on purpose.
:cool:
 

Jackman150

Feb 10, 2023
5
Joined
Feb 10, 2023
Messages
5
Take a photo of your setup.
You probably destroyed your own amp.
I like to go perhapsing around with the best of them but it is vital, do you have a combo unit or a single head unit. You're asking for help on a procedural based troubleshooting technique. The above question is asked as a process of elimination.
There is no guessing involved. That is probably what got you in trouble in the first place.
It's combo amp, and no it isn't fried, it didn't smoke. Did not even blow a fuse. Current limiter is used to protect the circuit. Thanks for the input, I will be going at on my own thanks again.
 

Attachments

  • fender_rumble_150_2010_sch_rev-b.pdf
    262.3 KB · Views: 6

Delta Prime

Jul 29, 2020
1,793
Joined
Jul 29, 2020
Messages
1,793
Here is the design manual for the power supply. along with with the data sheet for the power supply, it may come in handy, good luck to you.
 

Attachments

  • power supply icepower-50asx2se-class-d-amp designers manual.pdf
    1 MB · Views: 9
  • ICEpower50ASX2_Datasheet_1_8.pdf
    2.3 MB · Views: 4

Delta Prime

Jul 29, 2020
1,793
Joined
Jul 29, 2020
Messages
1,793
Thanks for the input, I will be going at on my own thanks again
After revisiting , rereading this thread in its entirety.
I don't blame you. I read like I am a jerk. Really no joke.
There are others here who would be happy to answer your questions. Far more knowledgeable and experienced than myself.
 

Delta Prime

Jul 29, 2020
1,793
Joined
Jul 29, 2020
Messages
1,793
Current limiter is used to protect the circuit.
Overload recovery refers to the ability to recover from a short circuited output.
In the recovery process the current limiting used to protect the output from drawing too much power.
The current limiting circuit reduces the
output current as the input to output differential increases.
During normal start-up, the input to output differential is small since the output
follows the input. But, if the output is shorted, then the
recovery involves a large input to output differential.
Sometimes during this condition the current limiting
circuit is slow in recovering. If the limited current is too slow to develop a voltage at the output,the voltage will
 stabilize at a lower level.
Under these conditions it may be necessary to recycle the power in order to get
the smaller differential voltage & adequate start up conditions.
.....
 

Attachments

  • 600651_1676376393399.png
    600651_1676376393399.png
    42.2 KB · Views: 1
Last edited:

Martaine2005

May 12, 2015
4,888
Joined
May 12, 2015
Messages
4,888
Overload recovery refers to the ability to recover from a short circuited output.
In the recovery process the current limiting used to protect the output from drawing too much power.
The current limiting circuit reduces the
output current as the input to output differential increases.
During normal start-up, the input to output differential is small since the output
follows the input. But, if the output is shorted, then the
recovery involves a large input to output differential.
Sometimes during this condition the current limiting
circuit is slow in recovering. If the limited current is too slow to develop a voltage at the output,the voltage will
 stabilize at a lower level.
Under these conditions it may be necessary to recycle the power in order to get
the smaller differential voltage & adequate start up conditions.
.....
I believe the OP was referring to a current limiting bulb.
But I never got an answer as to what bulb he was using.

Martin
 

Delta Prime

Jul 29, 2020
1,793
Joined
Jul 29, 2020
Messages
1,793
Okay... but it will cost you a nickel every time you use it.
I'll even throw in a vacuum cleaner.
DimbulbSketch_1611737928883_1624287244104.png

.
 
Top