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beomaster 2000 FM tuning

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Aad Jansse
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Aad Jansse posted on Wed, Oct 23 2019 2:35 PM

Recently I received help through this forum in the case of extending the use of my BC1200(R2R) by connecting it to my (white) BM2000. I assumed that I could explore now all the features of this BM, but to my disappointment I found out that choosing the FM button there is no reaction other than the tuning lights, ON, TUNING, STEREO, and the pointer, light up when turning the flywheel.That indicates that the the problem lies somewhere else:...... where, that is now my question.
The 5 FM presets are OK.

 

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Dillen
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Dillen replied on Wed, Oct 23 2019 3:11 PM

Silent Tuning enabled with a bad antenna?
Power supply to tuner (board-mounted rectifier and filter capacitor) bad?

Martin

Aad Jansse
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Antenna works fine with other BM's.

I will check the power supply. Rectifier and capacitor also, but, do you happen to know what component number these two have in the schematic/component list?

As usual, your help is much appreciated.

aad

Dillen
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Dillen replied on Wed, Oct 23 2019 5:34 PM

I don't recall the designations, but the small round rectifier sits on the board right in front of the mains transformer and the 470uF filter capacitor right next to it.

Martin

Aad Jansse
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Does this mean that the tuning lamps perform independent from this tuner power supply?

Aad

Dillen
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Dillen replied on Thu, Oct 24 2019 12:10 PM

Most likely the power supply still delivers some kind of power, but the problem is ripple, from either a missing diode in
the rectifier or bad filtering. This doesn't show on the lamps.
Too much ripple will cause malfunction in the tuner - and muting.

Martin

Aad Jansse
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Supply of B40C600 rectifier is impossible here sofar. Any equivalent ?

Aad

Dillen
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Dillen replied on Mon, Oct 28 2019 2:26 PM

A standard W06 will easily do the job.

Martin

Aad Jansse
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Still looking for a 2W06 rectifier, is a 2A 600V a standard type?

how about the capacitor: is a 35V 470u a good substitute for a 40V one?

Aad

RaMaBo
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RaMaBo replied on Tue, Oct 29 2019 3:30 PM

Hi,

 

a B40C600 is a full-wave rectifier with 40Volt (RMS) and 600 milli Amps.

So a B80C800 should do very well. You can get one from Reichelt in germany:

 

B80C800 (125V, 800mA)

 

 

Ralph-Marcus

RaMaBo
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RaMaBo replied on Tue, Oct 29 2019 3:33 PM

concerning the capacitor: the voltage should be higher or equal to the one used before. So i would recommend a 470µF / 50V or 63V  105°C. It should fit in place of the old 470µF / 40V because newer capacitors are smaller than the old ones.

 

 

Ralph-Marcus

Aad Jansse
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Thank you for your reactions: I will go after them tomorrow.

Aad

Aad Jansse
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With the newly arrived C's and rectifiers within reach I hesite to replace the ones on the pcb: I did, a little late, some measuring and found the results  as indicated in the service manual, except for the value of the cap, which shows 690uF instead of 470uF. Could this be the culprit of not being able to get the FM active? if this is no problem, where else can I search?

Aad

 


Dillen
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690uF for a 470uF capacitor is a clear sign, that it has lost its grip of things.

Martin

Aad Jansse
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OK, let’s replace it.

Thanks.

Aad

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