Beocenter 2200 Tapedeck Power Issue

13 replies
A(
aschenbrenner (archived2)
Bronze
82 posts
Posted November 23, 2020 at 10:58 GMT
#2147723

Guten Tag dear community, 

i'm working on a Beocenter 2200 in very nice condition which i was about to sell. Now i find that the tapedeck doesnt work at all. I changed all the Belts, but somehow the tapedeck motor is not turning and i do not hear any clicks even with a tape inside the deck. Voltage on Motor is like 100mV. Fuses are all intact. Only if i press 'next' i would hear a click comeing from the deck, but it would not go back unless i turn the whole unit off. Could it be that something has blown from the faulty belts or is there something i am missing ? 

Thank you in advance, any help is very much appreciated.

A(
aschenbrenner (archived2)
Bronze
82 posts
Posted November 26, 2020 at 13:15 GMT
#2147724

i could really need some help here, does anyone have an idea what the issue could be ? I have searched the whole forum without success.

DI
Dillen
BronzeModeratorFounder
12777 posts
Posted November 26, 2020 at 14:50 GMT
#2147725

Could be a missing power supply voltage.

Tape inserted.
Press TAPE

Press >   Does the motor start?
Press >> Does the motor start?

Martin

A(
aschenbrenner (archived2)
Bronze
82 posts
Posted November 26, 2020 at 22:12 GMT
#2147726

No nothing, i printed out the schematic and i checked all the resistors and diodes around the Toshiba TC9143P. The IC goes through Pin 1-8 and 1-16 with multimeter, could there be a short at pin 8 ? 

When tape button is pressed the light goes on but no click or motor running. If i press 'Next' the light for Next lights up and i hear a click and it gets stuck. I have to turn the whole thing off to reset. All the other tape related buttons do absolutely nothing. I also checked the tape insert switches and cleaned them.

Even when i turn the unit on the 'next' lights up and the relais clicks. Very strange... 

Otherwise everything works fine

A(
aschenbrenner (archived2)
Bronze
82 posts
Posted November 27, 2020 at 15:28 GMT
#2147727

Since the belt was stuck could there be a fuseable resistor for the tape motor which has blown ? 

DI
Dillen
BronzeModeratorFounder
12777 posts
Posted November 27, 2020 at 16:07 GMT
#2147728

Can you take readings of the voltages on 3TR15 all three pins when the motor is supposed to run?

Martin

A(
aschenbrenner (archived2)
Bronze
82 posts
Posted November 28, 2020 at 14:42 GMT
#2147729

on the motor itself its 170mV, by 3TR15 do you mean the 3 pins of TR15 ? both read 11,4V 

DI
Dillen
BronzeModeratorFounder
12777 posts
Posted November 28, 2020 at 15:24 GMT
#2147730

3TR15 is TR15 on module 3.

Voltages on

B ?
E ?
C ?

with respect to ground.

Martin

A(
aschenbrenner (archived2)
Bronze
82 posts
Posted November 29, 2020 at 20:33 GMT
#2147731

Hi Dillen, 

E = 11.7V  C = 0.5V   B = 11V gradualy dropping

 

when presing play

E= 11.75V    C= 0,8V.  B=11V droppping

 

When measuring the motor turned for a second but couldnt recreate it anymore 

 

Thank you for your help Martin, very much appreciated 

DI
Dillen
BronzeModeratorFounder
12777 posts
Posted November 30, 2020 at 06:56 GMT
#2147732

Where do you connect your meters ground terminal, when you take the readings?

The emitter pin of 3TR15 is connected to ground so should ALWAYS be at 0V.
So either ground is missing here or you are measuring wrong.

Martin

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