Beomaster 1900 quiet muffled left channel

14 replies
N(
Offline
nataniel (archived2)
Bronze
Posted May 28, 2014 at 21:56 GMT
#2248269

Hi folks,

I'm working through fixing up a Beomaster 1900 I bought a few weeks ago for a bargain.

The left channel is sounding muffled or hollow in the midrange.  I have tested this for Tape in (playing an Ipod) and for FM, and for speakers A, B and headphones out.  And I'm about 90% sure it actually had this problem before I started fiddling with it.

I bought the lights/ capacitors/ rectifier from Dillen on this forum, and replaced all of them, successfully I think.  I replaced them because the volume control was stuck on full, and several of the lights were out.  Replacing the volume control lights alone actually fixed this problem, but I went ahead and replaced the capacitors as well.

Incidentally the 'Loudness' button gives of a lot of crackle when its switched, I'll have a look at the wiring behind it shortly.

Any ideas???

Cheers, Nataniel.

N(
Offline
nataniel (archived2)
Bronze
Posted May 29, 2014 at 22:15 GMT
#2248270

Does anyone have a suggestion for what might be causing the muffled left channel?  And how to fix it?

Cheers.

DI
Offline
Dillen
BronzeModeratorFounder
Posted May 30, 2014 at 06:44 GMT
#2248271

A defective tonecontrol slider, - perhaps the treble ?

Martin

T(
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TrueBlue (archived2)
Bronze
Posted May 30, 2014 at 07:54 GMT
#2248272

maybe you can sell him one of them too ay?....pfft

T(
Offline
TrueBlue (archived2)
Bronze
Posted May 30, 2014 at 07:54 GMT
#2248273

frrrt

T(
Offline
TrueBlue (archived2)
Bronze
Posted May 30, 2014 at 08:01 GMT
#2248274

sounds more likely to be a poor signal connection due to a faulty balance slider....and if it isn't broken already, I think it would be a good idea to de solder the balance potentiometer (slider) and put a drop of glue on the plastic clip that holds the two plates on to reinforce it....as this part will inevitably break......

here is a link

DI
Offline
Dillen
BronzeModeratorFounder
Posted May 30, 2014 at 13:32 GMT
#2248275

TrueBlue wrote:

maybe you can sell him one of them too ay?....pfft

I don't need to sell anything but occasionally someone needs to buy something.
Advice is always free.

To place sales/wanted ads a minimum of silver membership is asked for.

What was that in your other post ?

Martin

N(
Offline
nataniel (archived2)
Bronze
Posted June 8, 2014 at 18:06 GMT
#2248276

OK, here's an update....

I have pulled apart the three sliders/pots and cleaned them.  All contacts were in place and intact.  The problem is still there.  Just to clarify - I do get a response out of all the sliders, on both channels. 

The same problem is there - my right channel sounds great, left channel sounds flat, hollow, muffled.  Is there any way to further diagnose what could be wrong?  

Any ideas please?? I really want to get this think working properly!

TR
Offline
traverso
Bronze
Posted June 9, 2014 at 10:30 GMT
#2248277

Dear True Blue

I believe you should calm down with this kind of overstated comment.

Regarding B&O products Mr Martin DILLEN is the technical reference and is always available for guiding.

In addition the 1900/2400 is the one he knows a lot. 

Enjoy your B&O experience

 

Alain

 

TR
Offline
traverso
Bronze
Posted June 9, 2014 at 10:30 GMT
#2248278

Dear True Blue, 

I believe you should calm down with this kind of overstated comment.

Regarding B&O products Mr Martin DILLEN is the technical reference and is always available for guiding.

In addition the 1900/2400 is the one he knows a lot. 

Enjoy your B&O experience

 

Alain

 

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