For the screws order a set of ISO screwdrivers. They are a perfect
fit & the screws will loosen with a little snap noise.
The battery is a "J" type camera battery. They could last 5 yrs
easily, I still have one that works with the original batt. Sometimes
the connector will grow tiny crystals & go int or dead. Just scratch at
them.
There may be a dimmer switch but its been years....
I have one of these & I will look for the owners manual. I had service manuals
but they all went to the dump, hundreds of VCR's a lot of gone $$$
73 Zeno
LFOD !