Hitachi VT35E

[Kiwick]

I have this 1984 Hitachi VT35E VCR, it's a real tank and it had a good picture when it still worked.

Some months ago it suddendly stopped working, when i turn it on with the "operate" button, the "tape in" indicator on the eject button stays lit even though there's no tape inside and the carriage is in its correct position to accept a tape, then after a few seconds the machine shuts off.

Also when it still worked the rewind/fast forward buttons often malfunctioned, you often pushed "rew" and the VCR would fast forward instead

What can be wrong? maybe there's some dirty switch?