ARCHIVED FORUM -- March 2012 to February 2022READ ONLY FORUM
This is the second Archived Forum which was active between 1st March 2012 and 23rd February 2022
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.
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.
Could be a missing power supply voltage.
Tape inserted.Press TAPEPress > Does the motor start?Press >> Does the motor start?
Martin
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
Since the belt was stuck could there be a fuseable resistor for the tape motor which has blown ?
Can you take readings of the voltages on 3TR15 all three pins when the motor is supposed to run?
on the motor itself its 170mV, by 3TR15 do you mean the 3 pins of TR15 ? both read 11,4V
3TR15 is TR15 on module 3.
Voltages on
B ?E ?C ?
with respect to ground.
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
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.
Sorry i think i used the wrong pin
E = 0v C = 10,5v B = 0,6v
Hmm... that B voltage is just on the edge...I would replace TR15 for a start. It's not a particularly critical type, something like a BC879 or similar darlington NPN would do fine.
Check also (or simply replace) the capacitors in the tape circuit. They are known to cause many problems. C7, C8, C9 C10...
Ok i will try to replace them. Thank you Martin for your effort and help