[Dillen]

Something shorted?
Which transistors did you replace?
How did they measure wrong?
And what did you fit instead?

Martin

[Dillen]

Sure you got the tracking angle correct?
I think it looks very steep.

Martin

[Dillen]

Make sure the whole motor assy hangs free in its spring supports.
The motors metal bracket must not touch the nylon bushings (or metal carrier
bracket depending on version) anywhere (in normal playing position),
or you will experience exactly what you describe.

Martin

[Dillen]

Why not have the Beogram repaired?
It’s a nice deck, and they are all repairable.

Martin

[Dillen]

It would not.
They are very different. Beogram 5000 opens all the way to the back and is opened at the push of a button by spring tension.

Martin

[Dillen]

The felt pad is most likely from a cassette tape.
Inside every tape cassette, on the reverse side of the tape, is a felt pad to press the tape up against the tapehead while playing.
I don’t recognize the spring.

Martin

[Dillen]

The spring has lost its tension.
Take it out and twist it from both ends towards the center to add more tension.

Martin

[Dillen]

The component designation depends on the exact type of Beogram 4002.

0TR4 in some versions.
1IC4 in other versions.
Etc.

Martin

[Dillen]

Shorted solenoid driver transistor?

Martin

[Dillen]

Could be a bad relay.
There are two, found on the large tape controller board under the turntable.

Martin

[Dillen]

radzio222 wrote:

But it doesn’t start event if I’m on CD mode.

Still normal.
Press CD instead, – and it will also close the door if open.
Same as with all other B&O CD players.
Martin

[Dillen]

Beocord 2000 prototype in palisander veneer.

Plus other minor differences:

Martin

[Dillen]

Burned output stage.
Not a job for an untrained – with all due respect. Repairs like this can give even highly
skilled tech guys a good run for their money.

Put short – replace everything from the differential amplifier outwards.
Then power up slowly using a variac while keeping an eye on the idle current and DC offset. Follow up with adjusting the idle.

Martin

[Dillen]

radzio222 wrote:

I found also that when i put CD and close a door it is not starting reading the disc, I need to push CD button

That’s normal. Closing the CD door should not be reason to f.e. switch from radio, or what else is playing, to CD.
Pressing CD, on the other hand, should.
Martin

[Dillen]

Thanks for the photo.
They are bipolar.
Some also have the word “Bipolar” printed across the cap at the “positive” end. Perhaps
visible if you rotate them a little.
Used heavily in B&O passive speakers.
The polarity marks merely indicates which pin is connected to the caps metal house.
But replace them – they will be out of spec by now.

Martin

[Dillen]

Should the unit operate without the aluminum covers in place?
Yes.

Does the wood trim need to be pushed in to operate?
No.

Can the fuses be tested or replaced?
Both. But some tech skills are required, and a fuse rarely blows for no reason.

What type of fuses are needed?
Depends on the exact version of Beogram 4004 – there are several.

Martin

[Dillen]

They should definitely be bipolar!
Are you sure you are not just seeing marks indicating which pin is connected to the caps alu housing (for shielding purposes in some applications)?
That can sometimes confuse.
Photo?

– But they would need replacing anyways due to age.

Martin

[Dillen]

That’s the type used for serial number 1524001 or greater.
I have had many Beomaster 4400 on the bench and only had very few bad potentiometers – but it can and does happen.

Martin

[Dillen]

Strange symptom, but could well be a bad volume potentiometer.
Note, there are two different types (of all the potentiometers), they have different
mountings, and they are not interchangeable.

Martin

[Dillen]

Sure it’s not just swapped sliders?
Volume should be the leftmost slider.

Does the balance control work as intended?
Bass and treble potentiometers are identical (if memory serves), Balance has reverse tracks, and the volume control has tabs for loudness.
So no, you cannot use anything but a volume potentiometer for volume.

Martin

[Author]

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