ARCHIVED FORUM -- March 2012 to February 2022READ ONLY FORUM
This is the second Archived Forum which was active between 1st March 2012 and 23rd February 2022
**This thread is continued from the ORIGINAL THREAD**
Its quiet. Too quiet.
On my way home from school this morning I was planning on enjoying a quiet and empty house with which to jam on my now functional BM3000-2.
Unfortunately this isn't how it worked out. A few minutes into one of my new CDs, I hear, from the other room, one channel coming in and out. I sprint into the room and realize that the right channel is going out - and fast. After a few minutes of messing around with switches, volume and the like, the problem remained.
I guess I'll just go do some homework. Bah.
Beo4 'til I die!
Hey Evan,
Well yes. I'm sorry to read that... Back to basics?
Jacques
Afternoon Jacques,
Back to basics, yes. Although I have to do something different this time. This is almost to the very first failure this machine had. I'm ordering my new 4700uF cap TODAY.
Well its cruising along now at volume 3/10 loudness off, tone flat. Working OK! I'm hoping some exercise can stabilize it but with my luck won't happen.
BTW, listening to my latest CD player, an NAD 5355 for $7!!!!!!! Deal of the century!!
Evan:BTW, listening to my latest CD player, an NAD 5355 for $7!!!!!!! Deal of the century!!
I have some misc NAD stuff sitting unused...
The NAD displaced my Technics unit - permanently.
Better send it to me. I think that would be best
Evan: The NAD displaced my Technics unit - permanently. Better send it to me. I think that would be best
I have NO IDEA what I even have... maybe a tape deck, and a 5 disc CD -or is it a single?... maybe something else???
Seeing how fast I am accumulating audio stuff, it wouldn't matter what you have! LOL
Evan: Seeing how fast I am accumulating audio stuff, it wouldn't matter what you have! LOL
You see...
You are where I was years ago... and that is why I have no idea what I have!
A/V is like a liquor cabinet... you drink the best and end up with lots of stuff.
burantek:you drink the best and end up with lots of stuff.
The EDIT button is now gone...
That should have read: you drink the best and end up with lots of "stuff."
...as in: grenadine, rose's lime, tuaca, creme de cacao, etc...
I feel like I'm starting a museum or something. I actually resisted (sort of) yesterday, I had the opportunity to buy a working Marantz player for - get this - $4. FOUR dollars! Didn't walk out empty handed, though! Those thrift stores are addicting!
burantek: You see... You are where I was years ago... and that is why I have no idea what I have! A/V is like a liquor cabinet... you drink the best and end up with lots of stuff.
Well, I guess I have a lot to look forward to! Time to start an inventory dude!
OK, this thing was cruising along brilliantly, I cranked it up a notch to 4/10 and it was really making some great, amazing noise! Then about 5 minutes in, the right channel starts acting up. Lame.
Evan: Its quiet. Too quiet. On my way home from school this morning I was planning on enjoying a quiet and empty house with which to jam on my now functional BM3000-2. Unfortunately this isn't how it worked out. A few minutes into one of my new CDs, I hear, from the other room, one channel coming in and out. I sprint into the room and realize that the right channel is going out - and fast. After a few minutes of messing around with switches, volume and the like, the problem remained. I guess I'll just go do some homework. Bah.
I found it impossible to do homework without music playing whether it was 1984-1988, 1997, 2000, or 2010-2011.
Good luck, sir.
burantek: Evan:BTW, listening to my latest CD player, an NAD 5355 for $7!!!!!!! Deal of the century!! I have some misc NAD stuff sitting unused...
Ditto.
My all time favorite receiver, the NAD 7175PE, until a certain BM4000 came into my life.
burantek: burantek:you drink the best and end up with lots of stuff. The EDIT button is now gone... That should have read: you drink the best and end up with lots of "stuff." ...as in: grenadine, rose's lime, tuaca, creme de cacao, etc...
And there's my argument for two ingredients: bourbon and ice.
Evan: OK, this thing was cruising along brilliantly, I cranked it up a notch to 4/10 and it was really making some great, amazing noise! Then about 5 minutes in, the right channel starts acting up. Lame.
That's the exact failure mode my BM4000 had, down to the volume level where it kicks in.
Output transistors.
richhaffner: That's the exact failure mode my BM4000 had, down to the volume level where it kicks in. Output transistors.
Martin wrote about this somewhere, and yes output transistors, and heat paste old, so check the transistors and apply new cream.
Collecting Vintage B&O is not a hobby, its a lifestyle.
richhaffner: Evan: Its quiet. Too quiet. On my way home from school this morning I was planning on enjoying a quiet and empty house with which to jam on my now functional BM3000-2. Unfortunately this isn't how it worked out. A few minutes into one of my new CDs, I hear, from the other room, one channel coming in and out. I sprint into the room and realize that the right channel is going out - and fast. After a few minutes of messing around with switches, volume and the like, the problem remained. I guess I'll just go do some homework. Bah. I found it impossible to do homework without music playing whether it was 1984-1988, 1997, 2000, or 2010-2011. Good luck, sir.
I wish I could say the same. Music is a huge distraction to me during homework, yet I listen to music during homework all the time. Be it BeoSystem or A8s/Form 2s.
richhaffner:Output transistors.
I had a feeling.
Søren Nielsen:Martin wrote about this somewhere, and yes output transistors, and heat paste old, so check the transistors and apply new cream.
Yes, a good reminder. Always replace the heat sink compound when changing semi-conductors.
Exactly how do I determine a output transistor to be faulty?
Evan:Exactly how do I determine a output transistor to be faulty?
Here and try onboard first, if you dont get clear readings, desolder the base pin.
Check the TO3 transistors, but they rarely fail, unless they were completely loose from the dissipator.
I'd also check the driver transistors, which in my experience are more prone to failure than the output ones (in fact they will protect them by blowing first).
Good luck my friend!
Thanks guys. I'm going to do this VERY soon. Too worn out from a little super bowl party to be fiddling with this thing.
Will post my findings shortly.
Just an update / bump.
My extra caps and 4700uF power cap are only 2 days away. Mouser has redeemed themselves.
The goods have arrived! Power cap, misc extra caps and a load of trimmers!
Good luck then!
Oh and just a quick word on the new 4700uF power cap - it is one of those short and fat ones. It will fit no problem, I am just stunned at how small it is. It's even smaller than the new nichicons I installed last month! From the looks of it, nichicon is exempt from the laws of physics!
Evan: Oh and just a quick word on the new 4700uF power cap - it is one of those short and fat ones. It will fit no problem, I am just stunned at how small it is. It's even smaller than the new nichicons I installed last month! From the looks of it, nichicon is exempt from the laws of physics!
And altogether now: "PICS! Or it didn't happen!"
Yes, and I may be stubborn, but those don't look the part for me. They are lightweight and far too small for what they are intended to do!
Rich:And altogether now: "PICS! Or it didn't happen!"
How could I have forgotten!
Technically speaking, bigger is ALWAYS better!
chartz: Yes, and I may be stubborn, but those don't look the part for me. They are lightweight and far too small for what they are intended to do!
I fully agree, except I thought the cap had a decent weight and feel. Deceiving things these.
Dear readers,
For those of you reading this who may not have caught the beginning of the story, please revisit the opening post. I have edited it to include a link to the original thread.
Rgds
A couple days ago I had a few spare minutes to work on the BM. The amplifier board is now officially recapped entirely!
Well, uh... that's about it for my status update.. 2 caps. Hey, its progress.
yes I am often shocked at how small and insubstantial new capacitors are but you have to remember that technology really does move in leaps and bounds and the originals are very old now!
Saying that the Nichicon you show us there really is tiny! I recently put some Panas in a 4000 PSU as the originals had spilled their guts everywhere and they were smaller than the originals but not that smalL! What voltage rating is it?
Olly
Step1: yes I am often shocked at how small and insubstantial new capacitors are but you have to remember that technology really does move in leaps and bounds and the originals are very old now! Saying that the Nichicon you show us there really is tiny! I recently put some Panas in a 4000 PSU as the originals had spilled their guts everywhere and they were smaller than the originals but not that smalL! What voltage rating is it?
That black Nichicon is an 80v unit - I think. I can't remember and I'm nowhere near it right now. What's more interesting are the Nichicon Muse caps I used for the audio signal paths. They are the exact same size as the old ones! Yes, they are a higher voltage, but they should still be at least a little bit smaller. Weird..
Here is an example:
Picking up a really old project that (like many others) are yet to be finished.
These are the IF board traces getting touched up in the computer to allow me to produce a new, blank IF board.
During my 3000-2's recap I didn't pay enough attention and put new caps in the wrong place... resulting in too much heat from the soldering iron - leaving burned joints and lifted traces. Because I am afraid of damaging the original even further...
I am starting over.
That's very brave Evan!
Yes, it will be a lot of work, but I am looking forward to it! Very excited to have a new preamp for my 3000-2.
I'm looking to have a more reliable unit, I thought about how I make repair after repair after repair. Time to just do it all.