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Rowe ami mmcd-2 left chanel distorted please help



 
 
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  #1  
Old October 9th 09, 08:22 PM
Calibuberls Calibuberls is offline
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First recorded activity by CollectingBanter: Oct 2009
Posts: 1
Default Rowe ami mmcd-2 left chanel distorted please help

I have a rowe mmcd-2
The left speakers have low and distorted sound.
The right all work perfect.
The overload light is not on and I have tried a different speaker.
Please help. Thanks Lance
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  #2  
Old October 9th 09, 10:31 PM posted to alt.collecting.juke-boxes
doc ellis
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Posts: 34
Default Rowe ami mmcd-2 left chanel distorted please help

On Oct 9, 2:22*pm, Calibuberls Calibuberls.
wrote:
I have a rowe mmcd-2
The left speakers have low and distorted sound.
The right all work perfect.
The overload light is not on and I have tried a different speaker.
Please help. Thanks Lance

--
Calibuberls


take the wires off the good sounding speaker with the unit off , check
the ohms of the voice coil.
then do the same with the other original speaker, both should be close
to the same. away to tell if it is in the Amp is to switch speakers,
if after the switch that side still sounds bad ,it is an Amp problem
or a cartiage problem or even a ground problem.
You don't say if it solid state or tube and I am not that good on
model numbers to know the defference.

Hope this helps. doc ellis
  #3  
Old October 10th 09, 01:09 AM posted to alt.collecting.juke-boxes
Ken Layton
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Posts: 187
Default Rowe ami mmcd-2 left chanel distorted please help

Pull the amplifier out. Flip it over and look at the 4 fuses (total)
on the two driver boards. One may be blown. If it is, then chances are
you have a bad output transistor or two for that particular channel.

  #4  
Old October 10th 09, 01:39 AM posted to alt.collecting.juke-boxes
DOCTOR FIX
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Posts: 6
Default Rowe ami mmcd-2 left chanel distorted please help

On Oct 9, 2:22*pm, Calibuberls Calibuberls.
wrote:
I have a rowe mmcd-2
The left speakers have low and distorted sound.
The right all work perfect.
The overload light is not on and I have tried a different speaker.
Please help. Thanks Lance

--
Calibuberls


YOUR AMPLIFIER HAS A LEFT, OR RIGHT CHANEL THAT IS DEFECTIVE MOST
LIKELY.
THE SPEAKER IN THE ROWE WORK WELL UNLESS A MOUSE HAD LUNCH AND NEEDED
A NAPKIN. (JUST A JOKE).
THE CARTRIDGE MIGHT BE HAVE A PROBLEM. SWITCH THE LEFT WIRE, AND RIGHT
WIRE, FROM THE CARTRIDGE. IF THE SAME SIDE IS DISTORTED,
IT IS THE AMP.
  #5  
Old October 11th 09, 05:29 AM posted to alt.collecting.juke-boxes
KR
external usenet poster
 
Posts: 49
Default Rowe ami mmcd-2 left chanel distorted please help

On Oct 10, 7:31 am, doc ellis wrote:
On Oct 9, 2:22 pm, Calibuberls Calibuberls.

wrote:
I have a rowe mmcd-2
The left speakers have low and distorted sound.
The right all work perfect.
The overload light is not on and I have tried a different speaker.
Please help. Thanks Lance


--
Calibuberls


take the wires off the good sounding speaker with the unit off , check
the ohms of the voice coil.
then do the same with the other original speaker, both should be close
to the same. away to tell if it is in the Amp is to switch speakers,
if after the switch that side still sounds bad ,it is an Amp problem
or a cartiage problem or even a ground problem.
You don't say if it solid state or tube and I am not that good on
model numbers to know the defference.

Hope this helps. doc ellis


Im quite sure that this is one of the "compact" sized CD jukes from
the mid 1990s. In which case everything (except the crossover network
and speakers) will be identical to a normal Rowe CD juke from that
era.


In my opinion, it will be blown output transistors on one channel. As
already pointed out by Ken Layton, examine the fuses on both driver
boards (the 2 square boards). If they are blown, test and replace the
associated output transistors on the heatsink. IF one is gone, I
would consider replacing both of them.

Make sure you don't mix up the transistors, or the connectors, they
are different types. Also make sure you use the insulating washer
underneath the devices that you replace, and heatsink compound. Make
sure the mounting screws are quite tight on all transistors to get
good heat transfer.

Adjust the output (with the output transformer unplugged) for as
close to 0v as you can get after doing this.

IF its not this, then one of the small FET devices in approximately
the second last stage of pre-amp board are the next culprit I would
look at.
 




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