Sign in   |  Join   |  Help
Untitled Page

ARCHIVED FORUM -- March 2012 to February 2022
READ ONLY FORUM

This is the second Archived Forum which was active between 1st March 2012 and 23rd February 2022

 

Beogram Type 59xx (9500: TX2 etc)

rated by 0 users
This post has 11 Replies | 1 Follower

W.Frankenberg / Gandalf
Top 500 Contributor
Heilbronn / Germany
Posts 290
OFFLINE
Bronze Member
Reply
W.Frankenberg / Gandalf Posted: Thu, Jan 25 2018 6:47 PM

hat jemand einen Schaltplan der Motor Control Elektronik des Beogram TX2?

Ich befürchte bei meinem Gerät defekte Kondensatoren darauf, finde aber nirgendwo eine Beschreibung dieser Schaltung

wilfried

ProGram
Top 200 Contributor
59269 Beckum, Germany
Posts 383
OFFLINE
Bronze Member
Reply
ProGram replied on Fri, Jan 26 2018 8:14 AM
Wozu eine Beschreibung? Tausche doch einfach gegen Neue mit gleichen Werten. Ich glaube aber eher, dass der Motor selber defekt ist. Oft sind die Schleifkontakte innen oxidiert. Hatte ich schon öfter. Außerdem können die Sinterlager auch einen Tropfen Öl vertragen.
W.Frankenberg / Gandalf
Top 500 Contributor
Heilbronn / Germany
Posts 290
OFFLINE
Bronze Member
Reply
W.Frankenberg / Gandalf replied on Fri, Jan 26 2018 12:06 PM

Danke für den Tip, dann werde ich am Wochenende mal den Motor zerlegen und das Lager fetten,

vieleicht kann ich dabei ja auch die Schaltung erkunden,

interessiert mich schon wie der Motor geregelt wird.

wilfried

W.Frankenberg / Gandalf
Top 500 Contributor
Heilbronn / Germany
Posts 290
OFFLINE
Bronze Member
Reply
W.Frankenberg / Gandalf replied on Sun, Jan 28 2018 4:39 PM

heute habe ich den Motor mal ausgebaut um nach den Schleifkontakten zu sehen.

Leider kann man den Motor ohne Spezialwekzeug nicht öffnen, geschweige denn wieder zusammenbauen, ist wohl nicht zum Reparieren gemacht ?!

Die anhängende Elektronik ist auch nur schlecht zu erkunden, auf der kleinen Platine ist ein Leistungstransistor (oder FET)  mit Aufschrift 947 verbaut,

dann sind da noch 1 Elko, 5 Folienkondensatoren, 3 Widerstände und eine Diode verbaut.

Es scheint sich um eine Tachoregelung des DC-Motors zu handeln.

Wie dem auch sei, jetzt suche ich mal nach einem Ersatzmotor mit der Typenbezeichnung "Servo 12V  MMX4H2RPB", vieleicht werde ich in eimem

Schrottgerät fündig.

Solange ist die Geschwindigkeit halt etwas unstabil.

wilfried

Dillen
Top 10 Contributor
Copenhagen / Denmark
Posts 13,191
OFFLINE
Founder
Moderator
Reply
Dillen replied on Wed, Jan 31 2018 6:41 AM

Are you sure the belt is in good condition and not slipping?
When you rotate the subplatter by hand (Beogram unpowered) and brake the motor pulley with a finger, does it "bite" the motor pulley or just slide on it with no resistance?

If the belt was never replaced, that would be the place to start.

Martin

W.Frankenberg / Gandalf
Top 500 Contributor
Heilbronn / Germany
Posts 290
OFFLINE
Bronze Member
Reply
W.Frankenberg / Gandalf replied on Wed, Jan 31 2018 5:45 PM

Hello Martin, thanks for your answer. Of course, as a first step, I changed the belt, but the speed is still fluctuating, which is why I think of a defective DC motor. The test that you have suggested I have made with a new belt, the subplatter can be turned against a small resistance, with bite as you say

wilfried

W.Frankenberg / Gandalf
Top 500 Contributor
Heilbronn / Germany
Posts 290
OFFLINE
Bronze Member
Reply
W.Frankenberg / Gandalf replied on Tue, Feb 6 2018 1:59 PM

I got a new (used) DC-Motor from an old device.">

The platter speed is now almost constant!">

Measured with stroboscope disc and 50Hz ">lamp.

Thanks to all for the tips

 

by the way, I'm still interested in what the little electronics do on the engine! Does nobody have a circuit or description of it?

wilfried

Dillen
Top 10 Contributor
Copenhagen / Denmark
Posts 13,191
OFFLINE
Founder
Moderator
Reply
Dillen replied on Tue, Feb 6 2018 2:28 PM

It's the electronic servo for the motor.
It maintains a steady speed according to a control voltage. 

Almost constant speed?
Well, you almost repaired your Beogram, then. 

Martin

sandeep1974
Not Ranked
Posts 5
OFFLINE
Bronze Member
Reply
sandeep1974 replied on Wed, Jan 12 2022 10:13 AM

sir

i am facing the same issue can you please send me any details like circuit diagram or a link from were i can purchase the motor 

thanks

sandeep

sandeepshelke.s@gmail.com

sandeep1974
Not Ranked
Posts 5
OFFLINE
Bronze Member
Reply
sandeep1974 replied on Wed, Jan 12 2022 10:13 AM

sir

i am facing the same issue can you please send me any details like circuit diagram or a link from were i can purchase the motor 

thanks

sandeep

sandeepshelke.s@gmail.com

sandeep1974
Not Ranked
Posts 5
OFFLINE
Bronze Member
Reply
sandeep1974 replied on Wed, Jan 12 2022 10:13 AM

sir

i am facing the same issue can you please send me any details like circuit diagram or a link from were i can purchase the motor 

thanks

sandeep

sandeepshelke.s@gmail.com

sandeep1974
Not Ranked
Posts 5
OFFLINE
Bronze Member
Reply
sandeep1974 replied on Wed, Jan 12 2022 10:13 AM

sir

i am facing the same issue can you please send me any details like circuit diagram or a link from were i can purchase the motor 

thanks

sandeep

sandeepshelke.s@gmail.com

Page 1 of 1 (12 items) | RSS
Need a cable? Just ask Steve at Sounds Heavenly
Sellong your B&O
Need a cable? Just ask Steve at Sounds Heavenly