Tascam 644 take up motor only working one way

[mojogamble]

Hi there,

I have a problem with my newly purchased Tascam 644 Midistudio that I found no solution for anywhere online. So, the take up motor (I think that's what it's called) only runs one way. Initially I could only rewind, and there was no reaction at all upon pressing the FF button. I installed the motor the other way around, and now I can only rewind instead of FF. I was trying to get inside the motor and see what I can tinker around with there, but I was forcing it a bit and decided to give it a pass for now. Hence the questions:

1. Where does the source of the problem lie? I couldn't find any problems with the wiring.
2. If the problem is in the motor, how do I get inside of it? I tried lifting these three prongs on the sides, but that didn't really get me anywhere (or did I not push hard enough)? Pic: https://drive.google.com/file/d/1mBaRAAuKD0x8tuw2sYes3GxooPJ5JSDL/view?usp=sharing
3. How do I remove the black holder and everything that's attached to it on the other side of the motor? Pic: https://drive.google.com/file/d/1wxSJAeP-dFuZVAdvetZclHC0SBC2d9MQ/view?usp=sharing
4. If I decide to buy a new motor, will I be able to move the parts mentioned in point 3 there or will I need new ones as well?

Cheers

 

[SkywaveTDR]

The DC motors that are in tape deck are usually the most basic 6V dc motor made. There is no special wiring in them and going inside one will do nothing for you. If the problem is not a mechanical one then it is a driver circuit problem. Some of these motors are driven by what looks like a Push-pull type drive circuit and the direction and drive to the motor is determined by the logic that is provided to the drive section. When the motor goes the other direction the polarity of the drive is changes that mean both the ground and the supply. They have BA chips that do this for decks. I have had some fail but generally they are very reliable.

 

[SkywaveTDR]

The drive come through pin 3,4 of P11 on the Mech Control board and from a U12 that is a BA6209.

 

[mojogamble]

Alright, I see it! Thank you very much for your help, I might not get to it straightaway, but I'll surely let you know once I've changed it!

 

[SkywaveTDR]

Just don't replace it but find out if it gets the input signals correctly and then if they are then if the develop the correct outputs. You can find this out with a meter. Also make sure the motor terminal has continuity to the chip as many connector solder joints get broken when you are working in a unit like this. Could be a broken solder joint of PCB. I find then all the time- vibration, heat cycling and you are talking a portable unit and they do get bounced around a lot as well as flexed- the frame is not die cast aluminum.
http://www.datasheetdir.com/BA6209+Motor-Controller-Drivers