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Recent repairs

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This post has 183 Replies | 11 Followers

joeyboygolf
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Dillen:


I was told, that B&O no longer sold spares. Not even to the danish repairshops.
- WHAT?
The only way to get the thing repaired was to bring it to a dealer, who would then send it on
to B&O for repairs.

This has been the policy for as long as I can remember, unless you get a friendly dealer to order them for you. These dealers were few and far between.

Regards Graham

Dillen
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Dillen replied on Wed, Apr 27 2016 3:34 PM

I appreciate your comments, gentlemen. I admit, I probably don't buy enough parts for the newer things but thanks to a forum member it seems
there's now a light at the end of the tunnel for this poor thing (the speaker, that is).  Smile

Martin

Piaf
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Piaf replied on Wed, Apr 27 2016 5:11 PM

Dillen:
Or simply buy SONY, Samsung or something else.

Hello Martin,

 

It is indeed a whole new world, rather cold, forbidding, and with NO respect for heritage or tradition. Rather sad, in a word.

 

B&O management has made the decision to no longer sell spare parts while at the same time closing many of their premier stores, like San Francisco, for example. This policy is shortsighted at best, and totally lacking a future, at worst.

 

Having worked in the corporate world all my life, I know that customer treatment comes from the very top, which is to say that excellent customer treatment exists because upper management demands it, while poor customer treatment is the result of upper management’s focus elsewhere.

 

I have tried on several occasions to source parts through Vancouver and let’s just say the technician wasn’t very professional.

 

I was sufficiently upset about one such occasion and contacted B&O. The manager for this region contacted me and before even hearing my “story” said, “So he blew you off did he?”

 

That sort of cavalier attitude combined with complete lack of concern HAS to come from higher up.

 

You may well be right; B&O is forcing us to buy SONY.

 

Jeff

 

Beogram 4000, Beogram 4002, Beogram 4004, Beogram 8000, Beogram 8002, Beogram 1602. Beogram 4500 CD player, B&O CDX player, Beocord 5000 T4716, Beocord 8004, Beocord 9000. Beomaster 1000, Beomaster 1600, Beomaster 2400.2, Beomaster 2400.2, Beomaster 4400, Beomaster 4500, Beolab 5000, Beomaster 5000, BeoCenter 9000. BeoSound Century,  S-45.2, S-45.2, S-75, S-75, M-75, M-100, MC 120.2 speakers; B&O Illuminated Sign (with crown & red logo). B&O grey & black Illuminated Sign, B&O black Plexiglas dealer sign, B&O ash tray, B&O (Orrefors) dealer award vase,  B&O Beotime Clock. Navy blue B&O baseball cap, B&O T-shirt X2, B&O black ball point pen, B&O Retail Management Binder

 

Piaf
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Piaf replied on Wed, Apr 27 2016 5:19 PM

Guys,

 

With my unfortunate (terrible) experience with the Vancouver dealer as well as Seattle, I completely forgot to mention (Graham spurred my memory) that the Toronto, Ontario dealer couldn’t have been more helpful. Not only did they supply the parts I wanted, they openly welcomed older equipment for servicing…… sold it as well. Yes - thumbs up

 

Jeff

Beogram 4000, Beogram 4002, Beogram 4004, Beogram 8000, Beogram 8002, Beogram 1602. Beogram 4500 CD player, B&O CDX player, Beocord 5000 T4716, Beocord 8004, Beocord 9000. Beomaster 1000, Beomaster 1600, Beomaster 2400.2, Beomaster 2400.2, Beomaster 4400, Beomaster 4500, Beolab 5000, Beomaster 5000, BeoCenter 9000. BeoSound Century,  S-45.2, S-45.2, S-75, S-75, M-75, M-100, MC 120.2 speakers; B&O Illuminated Sign (with crown & red logo). B&O grey & black Illuminated Sign, B&O black Plexiglas dealer sign, B&O ash tray, B&O (Orrefors) dealer award vase,  B&O Beotime Clock. Navy blue B&O baseball cap, B&O T-shirt X2, B&O black ball point pen, B&O Retail Management Binder

 

Dillen
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Dillen replied on Fri, Oct 21 2016 8:36 AM

Beogram RX2
A fellow Beoworlder brought this one in.
He couldn't get the speed right and he suspected both the belt and the speed setting trimmers.
On the bench it was soon confirmed, that the platter belt was slipping, causing a wow under even the
slightest load. The mere presence (weight) of a record would see the speed fluctuating.
With the deck came an envelope with a new belt.
I tried fitting it but had to give up. It was way to tight. If I should ever manage to fit it, the
floating subchassis would have been pulled tight up against the main chassis by the belt tension and
it would no longer be floating as intended.
The delicate sinter bronze bearings in the motor would be at the other end of that enormous tension and
the motor wouldn't run for long like that.
For comparison I put the original and the new belt side by side. The new belt seems to
be at least 10cm (!) shorter than the original but there's really no need for any
scientific tests or measurements - a brief look will do:



A belt from my own production was then fitted and the deck would now run steady - but the speed was
way wrong. An attempt to set the speed right came out fine on 45 but unsuccesful on 33. It was like
the trimmer did nothing. And that was indeed the case.
I can only presume that the owner had accidentally damaged the trimmer during what could perhaps have
been more and more desperate attempts at getting the speed right.
I replaced both trimmers, adjusted them, rearranged a few internal cables that were close to contacting
the subplatter when installed and put the deck back together.

The owner paid a good 20 pounds for the useless belt. He ought to get his money back.
Every time something like this happens - and unfortunately that's quite often - I can't help wondering how many of these they've sold?
- Ooh, scary thought..

Martin

Jeff
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Jeff replied on Fri, Oct 21 2016 4:08 PM

Martin, you are truly a consummate professional with a deep respect for B&O. I'm glad you're out there and glad you post to this thread, always interesting and informative. I just wish you lived on this side of the ocean! Two of my turntables could use some TLC, and I haven't even had the time to look at them.

 

Jeff

Beovirus victim, it's gotten to be too much to list!

Sal
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Sal replied on Fri, Oct 21 2016 4:49 PM

Jeff:

Martin, you are truly a consummate professional with a deep respect for B&O. I'm glad you're out there and glad you post to this thread, always interesting and informative. I just wish you lived on this side of the ocean! Two of my turntables could use some TLC, and I haven't even had the time to look at them.

Jeff, I concur about Martin, absolute top notch!

Have you considered sending your TT's to The SoundSmith? About 15 years ago I had my Beogram 6500 TT repaired to new from them, and it only needed a bit more TLC earlier this year, which was done at a service center here in CA. If I was on or near the East Coast again, I'd not hesitate in inquiring at SoundSmith. I'm sure you're also familiar with their Cartridges, too.

 

Piaf
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Piaf replied on Fri, Oct 21 2016 11:59 PM

Sal:
Jeff, I concur about Martin, absolute top notch!

This is the "other" Jeff and I absolutely agree, Martin is top notch!

While I know the reputation of SoundSmiths I also know how much they charge. Might I humbly suggest Benny at Modular Electronics near Atlanta, Georgia. Benny is excellent and very, very dependable. Yes - thumbs up

Jeff

Beogram 4000, Beogram 4002, Beogram 4004, Beogram 8000, Beogram 8002, Beogram 1602. Beogram 4500 CD player, B&O CDX player, Beocord 5000 T4716, Beocord 8004, Beocord 9000. Beomaster 1000, Beomaster 1600, Beomaster 2400.2, Beomaster 2400.2, Beomaster 4400, Beomaster 4500, Beolab 5000, Beomaster 5000, BeoCenter 9000. BeoSound Century,  S-45.2, S-45.2, S-75, S-75, M-75, M-100, MC 120.2 speakers; B&O Illuminated Sign (with crown & red logo). B&O grey & black Illuminated Sign, B&O black Plexiglas dealer sign, B&O ash tray, B&O (Orrefors) dealer award vase,  B&O Beotime Clock. Navy blue B&O baseball cap, B&O T-shirt X2, B&O black ball point pen, B&O Retail Management Binder

 

Jeff
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Jeff replied on Sat, Oct 22 2016 12:29 AM

Thanks for the suggestions Sal and Jeff. Since I live fairly near Atlanta, I think Benny at Modular Electronics is probably my best bet. I've got my main table, that need some adjustment and undoubtedly some lube and such, and a spare that has the arm mechanism jammed. Since I have two cartridges, an MMC4 and MMC2, I'd like to have them both in service in different rooms.

Jeff

Beovirus victim, it's gotten to be too much to list!

Piaf
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Piaf replied on Sat, Oct 22 2016 3:22 AM

Jeff:
I think Benny at Modular Electronics is probably my best bet.

Hi Jeff,

Benny is absolutely wonderful! Great communications and more importantly, he handles the equipment with extreme care.

My Beomaster 2400 is virtually flawless and it came back EXACTLY the same as when I sent it. The Beomaster 4500 is "almost" as nice, but it too arrived the way I sent it.

Both perform in as-new condition.

The "icing on the cake" is Benny's repair charges are MORE then reasonable.

When you take your equipment to Benny, please tell him I recommended him, as I consider him a "friend."

Jeff

Beogram 4000, Beogram 4002, Beogram 4004, Beogram 8000, Beogram 8002, Beogram 1602. Beogram 4500 CD player, B&O CDX player, Beocord 5000 T4716, Beocord 8004, Beocord 9000. Beomaster 1000, Beomaster 1600, Beomaster 2400.2, Beomaster 2400.2, Beomaster 4400, Beomaster 4500, Beolab 5000, Beomaster 5000, BeoCenter 9000. BeoSound Century,  S-45.2, S-45.2, S-75, S-75, M-75, M-100, MC 120.2 speakers; B&O Illuminated Sign (with crown & red logo). B&O grey & black Illuminated Sign, B&O black Plexiglas dealer sign, B&O ash tray, B&O (Orrefors) dealer award vase,  B&O Beotime Clock. Navy blue B&O baseball cap, B&O T-shirt X2, B&O black ball point pen, B&O Retail Management Binder

 

Jeff
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Jeff replied on Sat, Oct 22 2016 4:38 AM

Will do Jeff, thanks!

Jeff

Beovirus victim, it's gotten to be too much to list!

Piaf
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Piaf replied on Sat, Oct 22 2016 7:51 AM

 

Jeff:
Will do Jeff, thanks!

Jeff, you are most welcome.

Although I am 100% certain of the outcome, I'd love to hear the outcome of your entrusting your equipment to Modular Electronics. Big Smile

Jeff

Beogram 4000, Beogram 4002, Beogram 4004, Beogram 8000, Beogram 8002, Beogram 1602. Beogram 4500 CD player, B&O CDX player, Beocord 5000 T4716, Beocord 8004, Beocord 9000. Beomaster 1000, Beomaster 1600, Beomaster 2400.2, Beomaster 2400.2, Beomaster 4400, Beomaster 4500, Beolab 5000, Beomaster 5000, BeoCenter 9000. BeoSound Century,  S-45.2, S-45.2, S-75, S-75, M-75, M-100, MC 120.2 speakers; B&O Illuminated Sign (with crown & red logo). B&O grey & black Illuminated Sign, B&O black Plexiglas dealer sign, B&O ash tray, B&O (Orrefors) dealer award vase,  B&O Beotime Clock. Navy blue B&O baseball cap, B&O T-shirt X2, B&O black ball point pen, B&O Retail Management Binder

 

chartz
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chartz replied on Sat, Oct 22 2016 9:11 AM

The Beoworld is a better place with people like Martin, John, Rudy, Søren, et al. Smile

Jacques

Piaf
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Piaf replied on Sat, Oct 22 2016 5:22 PM

Jacques, I second that! It sure is! Smile

Jeff

Beogram 4000, Beogram 4002, Beogram 4004, Beogram 8000, Beogram 8002, Beogram 1602. Beogram 4500 CD player, B&O CDX player, Beocord 5000 T4716, Beocord 8004, Beocord 9000. Beomaster 1000, Beomaster 1600, Beomaster 2400.2, Beomaster 2400.2, Beomaster 4400, Beomaster 4500, Beolab 5000, Beomaster 5000, BeoCenter 9000. BeoSound Century,  S-45.2, S-45.2, S-75, S-75, M-75, M-100, MC 120.2 speakers; B&O Illuminated Sign (with crown & red logo). B&O grey & black Illuminated Sign, B&O black Plexiglas dealer sign, B&O ash tray, B&O (Orrefors) dealer award vase,  B&O Beotime Clock. Navy blue B&O baseball cap, B&O T-shirt X2, B&O black ball point pen, B&O Retail Management Binder

 

Jeff
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Jeff replied on Sat, Oct 22 2016 6:04 PM

Piaf:

 

Jeff:
Will do Jeff, thanks!

Jeff, you are most welcome.

Although I am 100% certain of the outcome, I'd love to hear the outcome of your entrusting your equipment to Modular Electronics. Big Smile

Jeff

I'll keep you informed. It will probably be January before I get time to get it to him, lots going on at the end of the year for me.

Jeff

Beovirus victim, it's gotten to be too much to list!

Dillen
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Dillen replied on Sat, Jan 7 2017 1:19 PM

Beocord 9000
A particularly beautiful one was brought to me for repairs.
The deck would play previously recorded tapes fine but playing back a tape that was just
recorded on it, the right channel sounded "muddy".
Tapes recorded on the Beocord was also sounding "muddy" when played back on a different deck so
the problem had to be with the Beocords recording.
The way it sounded very soon had my thoughts circling around the bias circuitry, perhaps the HX-Pro.
Anyway, always first - tapeheads were cleaned thoroughly, but it brought no improvement.
Then I began measuring about a bit.
Curiously, on the bench everything looked fine on the scope, bias was running fine and the
recordings were also perfect.
I took it home and connected it to the Beomaster 8000 in my livingroom; Right channel
muddy and unclear - no doubt at all!
Back on the bench, measuring the deck again I found that the deck would function perfectly
when open into serviceposition, but fail when closed.
Ahh.. a cracked solder joint somewhere then - that wouldn't be a first.
I checked the whole thing, found a little here and there but nothing that could be related
to the bias problem, which persisted nicely.
Rats - how on earth would I ever be able to diagnose and find this fault when it keeps going
away with the deck open?
I carefully pulled, reinserted, flexed and bent cables - nothing.
I carefully poked and flexed circuitboards - nothing.
Then I noticed two vertically mounted resistors under a ribbon cable with their bared leads
very close to touching. With the aid of a flashlight I kept an eye on them, looking in from
the side as I slowly closed the Beocord.
Bang! The ribbon cable pressed down on one of the resistors, pushing it firmly up against the other and
caused a short.
I checked the schematics and found that both resistors form part of the tape type selection circuit.
Bias problem confirmed.
I rearranged the resistor in question, closed the deck and tested it again.
All fine now.


Beocord 9000 is a marvelous machine. Definitely one of the best cassettedecks ever produced.
With its computer calibration and loads of digitally controlled signal path switches etc. it's
so complicated and at times tricky to service - only to achieve a position merely a horses nosehair in
front of the competition.
There's no doubt, that a well serviced, meticulously cleaned Beocord 9000, calibrated with a
factory new good quality tape CAN produce marginally better results than other Beocords, but it's
my experience, that a Beocord 8004, which also supports HX-PRO recording, is capable of producing
results that are so immensely close to those of a Beocord 9000 - and generally produce great results
no matter the tape etc. without all the calibrations and fine tuning, that it would be an excellent
alternative.

Martin

ALF
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ALF replied on Thu, Jan 26 2017 5:34 AM

Hi martin,

Could you point out which diode that's been left out on the circuit diagram ??

Like position 2F or similar ??

Much appreciated - don't want the chance of making the same mistake :-)

Cheers

ALF

Dillen
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Dillen replied on Thu, Jan 26 2017 11:01 AM

ALF:

Hi martin,

Could you point out which diode that's been left out on the circuit diagram ??

Like position 2F or similar ??

Much appreciated - don't want the chance of making the same mistake :-)

Cheers

ALF

Assuming your post must be related to my post from may 2014, where I told about a Beomaster 4400.

If so then sorry, I don't recall where the diode sits exactly, but there's not a huge amount of diodes in
the output stage so compare the circuit to the schematics and you'll find it.

Martin

 

ingehn
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ingehn replied on Sun, Oct 22 2017 8:11 PM

Hi, Martin.  I have a white Beogram CD 6500 from early ninety’s which I have used since.  But the last years I have got some problems.  The tray wont work properly and I have found out that the belt has gone loose, so it should be changed.

 The other problem is that the CD stops some seconds after start without any sound and it won’t play. I have swept over the laser head with a soft cloth, but the problem lasts.  I have read about the capasitors at the underside of the main board, but can’t find anything after loosing the board.  How do they look like?  And do you think those could be the reason?

If so, where can I buy theese items? I live in Norway

Dillen
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Dillen replied on Mon, Oct 23 2017 9:55 PM

You have email.

For parts request in general, please email or PM me.

Martin

Dillen
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Dillen replied on Sat, Nov 11 2017 5:16 PM

Beomaster 1100
This one came from Germany.
The owner said it had stopped working.
And right he was. It didn't work.
Covers off and I soon discovered a warm area and a burned hole around a solder pad for power resistor 5R1.

Under normal conditions this component gets about handwarm, so this one definitely faced a higher current flow than usual.
A brief look at the schematics and it was clear, that this could only come from a shorted voltage regulator 5TR1.
And quite right, it had a dead E-C short, allowing a good 45 Volts onto the 33V rail.
Luckily most of the circuits on that rail is fairly forgiving and nothing had blown so I chose to replace
the transistor and fitted a new diode for 5D1 for good measure. After all that poor diode saw the same current flow as the resistor.

With the burned hole and broken copper traces tidied, the radio was back to life.
I decided to replace the idle current trimmers and adjust them. The original parts looked better than average but they will fail sooner or later.
I also replaced a good handful of capacitors now I had it on the bench.

I want to take this opportunity to answer many questions regarding the blobs of thermal paste on the driver transistors.
I have seen cases where owners clean it off and that could spell disaster; The thing is, that the driver transistors
amplification factor (hFe) depends greatly on temperature. So does the output stage transistors - and even more so because
they are darlingtons and in effect "two transistors in one", one after the other.

As the output stage heats up in use, the amplification increases, that in turn increases the temperature and if no means for
regulating this was incorporated the whole thing would do a thermal runaway until something burns or blows.
(These repairs are often quite involved).

To counter for this situation, the driver transistors are placed physically near an output stage transistor and thermally connected
to its collector pin (center pin in this case), which representes the "spine" material of the output stage transistor, which is also
the surface that is bolted towards the cooling fin. All copper so very good thermal leads.
The thermal connection is done by placing the driver transistor in a coil of quite heavy gauged tinned copper wire, often soldered
to the output stage collector, with a good blob of thermal paste added between the driver transistor and the coil.

This allows the driver transistor to "sense" the temperature of the output stage and regulate the idle current accordingly.
So whenever you see this, don't clean it off, unless it has hardened and started flaking off in which case it must be renewed.
(Always use the good old white thermal compound, - the modern grey stuff sold for computer processors will dry to an almost
solid mass in a matter of weeks = no good for amplifier purpose).

 

A fresh set of lamps were fitted and with the Beomaster now playing along nicely, I noticed the pushbutton for the power switch
had a nasty scratch.
I can't send this otherwise well-preserved and loved set back with that unsightly button.
The dungeons provided a nice replacement.

It played the whole next evening while I worked on an unusually stubborn Beogram CD50 that had
numerous "mods" and "hacks" done to it - all of which I had to first figure out and then reverse to make it play again.

Another Beomaster back in daily use.
They are nice sets. Too bad some countries chose to settle for DAB. FM provides a much better sound quality, being a technology refined
through decades.

BTW - there's no such thing as "digital broadcast". You cannot send 0s and 1s (read: morse) "fast enough" unless modulated into
something else. Just like data on magnetic media, hard disk drives etc.

It's all FM modulated.
Did I hear a laugh?..

Martin

Dillen
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Dillen replied on Sat, Nov 11 2017 7:59 PM

Master Control Panel 5500
This one was found with batteries still inside...
Old batteries...
Quite apparent - no need to open the battery compartment to tell...

Bummer...

Well, the only way forward was to open it and see how much had been eaten away and how much (if anything) could be saved.
Luckily, and in no small way thanks to it having been stored standing on its backside, it seemed to be a
limited and local happening with only the rightmost transceiver hit - but very much so.
The transceiver was almost completely covered in dried battery fluids. Looked a bit like sugar.

A good rinse under running handwarm water took away the junk from both the panels plastic housing shell and the transceiver module, but the module was beyond repair.

A good replacement transceiver was dug out of the dungeons and with that fitted the remote was back in service.
The only thing left to do now is clean the shelf where it stood.
I'd better get on with that...

Martin

Piaf
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Piaf replied on Mon, Nov 13 2017 3:19 AM

Martin,

Impressive work, as always.

Jeff

Beogram 4000, Beogram 4002, Beogram 4004, Beogram 8000, Beogram 8002, Beogram 1602. Beogram 4500 CD player, B&O CDX player, Beocord 5000 T4716, Beocord 8004, Beocord 9000. Beomaster 1000, Beomaster 1600, Beomaster 2400.2, Beomaster 2400.2, Beomaster 4400, Beomaster 4500, Beolab 5000, Beomaster 5000, BeoCenter 9000. BeoSound Century,  S-45.2, S-45.2, S-75, S-75, M-75, M-100, MC 120.2 speakers; B&O Illuminated Sign (with crown & red logo). B&O grey & black Illuminated Sign, B&O black Plexiglas dealer sign, B&O ash tray, B&O (Orrefors) dealer award vase,  B&O Beotime Clock. Navy blue B&O baseball cap, B&O T-shirt X2, B&O black ball point pen, B&O Retail Management Binder

 

Hiort
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Hiort replied on Tue, Nov 14 2017 11:36 AM
Love this thread.

Super impressed by skilled people that can breathe live into these old beauties Smile

 

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