Beomaster NR 2200 type 1601 volume problem

22 replies

Hello everyone first post here, I was fortunate to pick up my first beomaster today, I regularly repair electronics and I thought this would be the best place to come to ask a few questions....

The problem I am having is the unit seems to be very low volume when volume pot is at maximum, I've been right through it and replaced most of the electrolytic capacitors already....

I believe the problem is the *****....now out of the 3 pots on the tone board the balance is different....now I think that some copper plates that make contact may have come out as it looks different but I am unsure and don't want to try taking it apart encase I break it....I will upload pictures if possible...but I am thinking this is possibly a common problem...?

I have also been unable to find ***** ...maybe someone can help me there as well....?

EDIT by Dillen
Beoworld moderator.

Welcome to Beoworld !

First thing with all Beomaster 2200 is to replace the electrolytic capacitors on the voltage regulator module.
That's four or five caps.

Martin

That's a shame, nothing worse than having to pay a membership just to access user manuals...all I really want it for is to check idle current...but anyway.....yes as stated ive replaced all those dirty old red caps...quite a few of them were bad....

The problem is the balance potentiometer, after doing a bit more reading I see this is a common problem.......I de soldered the pot and managed to dismantle it, I gave it all a bit of a clean but I would say someone has used some kind of evil solvent on it at some stage...probably wd40.......I got it back together and have managed to get full volume back but the pot is still not functional.......I am wondering about successful repairs on these?....at the moment I am considering running some wires off pcb to a new 20k ohm pot maybe discretely drilled into side of unit.....thinking this is probably the best long term solution.......thoughts?

Just want to add, this is a really sweet sounding unit......it came with some s-40's as well that will need a refoam....cant wait to get it all back together....

I may need a few parts if anyone has a ****....one being the **** .....this has broken where the ****....also wondering if this lid should be spring loaded?

 

EDIT by Dillen
Beoworld moderator.

A balance potentiometer "discretely" drilled into the side ?
Nothing worse than hearing suggestions like this.

Yes, the lid is spring loaded and dampened, opens slowly by itself.

If you upgrade to at least silver membership level, you can place sales/wanted ads.
Your support will be appreciated. I have lots of good used original parts in the dungeons.

Martin
Beoworld moderator

TrueBlue wrote:
.at the moment I am considering running some wires off pcb to a new 20k ohm pot maybe discretely drilled into side of unit.....thinking this is probably the best long term solution.......thoughts?

Uhhh...Bad idea!

I know, and I dislike such modification on any vintage unit, but...the likelihood of getting a suitable replacement in "good" condition I believe is slim...as from what I have read...this pot seems to be a common fail on a lot of B&O units.....

I should have said drilled into rear.....there is a lot of empty space on right hand side of unit......know one would ever see it....and it would be easy to just reach over the unit to adjust balance when required.....in saying this I will have another go at disassembling pot and repairing...but I believe the problem lies with the resistive coating that has been worn away....

I had a look at the mechanism that operates the lid today, some hell gunge has been put into this, almost like honey but worse....even with parts out and soaked in hot soapy water has been very hard to get them clean again.....I will just have to do as best I can to get it out of the chassis cavity......upon getting it back together, I think the **** may need replaced ( is this common?)as there is no way it will lift the lid on its own....very light weight spring for a reasonably heavy door....

As far as the membership goes, This is my first post and I have been prompted to pay a membership already....I am a believer in try before you buy.....

 

EDIT by Dillen
Beoworld moderator.

TrueBlue wrote:
..the likelihood of getting a suitable replacement in "good" condition I believe is slim..
Not! As I read "Dillen's" post, he was offering a solution. 
Dillen wrote:
...I have lots of good used original parts in the dungeons....
🙂

TrueBlue wrote:
As far as the membership goes, This is my first post and I have been prompted to pay a membership already....I am a believer in try before you buy.....
You are not asked to buy the site, just to support it!

I don't believe he specifically said he has a **** for this unit in good condition.....although I do appreciate his post.....I don't want to get into an argument here......but I am a member of several forums that I regularly post in that don't require a membership....one of my posts last month is already up to 3000 hits....is that not contributing?......

This is my first B&O unit....and I am so far impressed with the engineering.....and most importunately sound quality, it has a silkiness about it.....its just waiting on a few more caps......and for now only tested on my dummy loads....I look forward to hearing its full capability......and again admiration for its construction....I may become a B&O fan....but for now I need help, not another bill on the table......

Cosmetically this unit is about 75%.......I have invested more time and money than I would normally just to experience B&O.....so work with me...

 

EDIT by Dillen
Beoworld moderator

TrueBlue wrote:
...but for now I need help, not another bill on the table......
The basic membership is free...
TrueBlue wrote:
....so work whith me..
We do!

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