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It happens for me to have two stepper motors of the same type (TEAC 14769070-90). I also own two TEAC 14769060-00.
Please, if anyone knows what is the working tension, how many milliamps it needs, what is the torque, whether it can half-step or not, what is the maximum speed (steps/min) or if anyone found any datasheet, please drop me a line.
To learn what voltage and current is suitable for your motor, locate the transistor array integrated circuit on the board the motor was originally connected to.
It's usually a fairly small circuit, you should be able to find it easily, on side end it's (was) connected to the motor and on the other side it's connected to the main microcontroller. You can then simply search the datasheet for that particular transistor array and it'll be all there
In my case the motor is TEAC 14769070-90 and the transistor array is M54534P. The voltage is 5V and the array's maximum output voltage per channel is 320mA, which implies the motor only needs something below 320mA.
I have no idea what the difference is between TEAC 14769070-90 and TEAC 14769070-30.
If you plan to use the motor, it may not be a bad idea to use the array from the board, if you're ok with SMD. Or obtain similar one from a store.
Ok, that's all. I'm sorry for necroposting, but this page is one of the top google results for "TEAC 14769070" so I just wanted to add info in case someone stumbles upon this. Hope you don't mind.