Tascam 464 only plays, RW or FFW for a few seconds

[faxika]

Hello,

I`m having the following issue with an old and not running tascam 464:
- I replaced the C gear, it was broken
- Replaced the belt
- Cleaned and lubricated the mecha parts

Heres a video of the problem:

So now, the unit runs fine in TEST MODE (holding play button and turning it on), when the Cassete Switch is closed, it STOPS
Speed and tape torque seems good in the few seconds that is plays the tape, I can also record in the fews seconds that it runs before stopping

All motors are running fine, so I started looking for eletronic component problem, and started from the nearest the cassete switch and tryied to test the U11, its a UN4212 transistor, but I dont know if its good or not, any tips on testing it? looks like its not a normal transistor

 

[SueDonim]

Did you ever figure this out. I have a similar issue where it performs perfectly in the tape cleaning mode, but as soon as I exit that mode the buttons don't work.

 

[Phil Tipping]

...tryied to test the U11, its a UN4212 transistor, but I dont know if its good or not, any tips on testing it? looks like its not a normal transistor

Can't help with the 464, but if you're in any doubt about a component, just search for its name and the word 'datasheet'. Here's page 1 from the UN4212 datasheet.