[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

[Dillen]

If the motor leads were desoldered, they could also be reversed.

Martin

[Dillen]

Center puck seized in the down position?
Using a record weight? – Don’t!
Using an antistatic mat? – Dont!
If the latter throw the mat away or sell it to somebody who cares less about correct tracking angle and risk of stylus damage. It has no use on any Beogram anyways.

Martin

[Dillen]

yachadm wrote

By adjusting the platter height at the center axle, he screwed up the 23mm tonearm height.

– And the tracking angle.
All in all a clear example of someone who doesn’t know what he is working with.

Martin

[Dillen]

Stylus tip looks round.
If indeed so, that would be the reason.

Martin

[Dillen]

Can you tell if the laser tries to seek focus? – Does it move up and down a few mms when you press play without a disc loaded?
Is the laser emitting light? – The face-facing camera on f.e. an iPhone can usually see the light.

Martin

[Dillen]

A lead broken off inside the Beograms plug?
Problem with the Beomasters input/preamp? – Perhaps a broken trimmer?
Defective MMC cartridge?

Martin

[Dillen]

C2103 on the servo board is critical.
Fitting a low-ESR cap here is the recipe for trouble. It must be a blue Philips/BC axial type.
A kit exists for this particular problem.

Martin

[Dillen]

The mech. things (power switch slider etc.) in the switch group could need cleaning and the contacts perhaps a shot of contact cleaner.

Martin

[Dillen]

Could be a focus problem.
Can you tell/see, if the laser lens moves in and out to search for focus, when you press
CD with no disc loaded?

Martin

[Dillen]

The belt is slipping, allowing the motor to accellerate and lock to twice the set speed.

Replace the belt.

Martin

[Dillen]

They are identical to a version of Beovox C40.
Exported to Netherlands only, as far as I know, to be a model number match to Beomaster 2300 (which was UK and Netherlands only).

Martin

[Dillen]

What Geoff said.
– And some aftermarket stylii are better than others…

Martin

[Dillen]

A common problem is a bad belt.
Is the motor running?

Martin

[Dillen]

They are very much standard:

https://www.biltema.dk/byggeri/elinstallationer/monteringsdetaljer/kronmufferakke-2-stk-2000017379

Martin

[Dillen]

The Stereo indicator should not light up when tuning between stations.
You could have a bad decoder IC.

Martin

[Author]

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