Just use it as is to play and get your content off the old tapes. I've seen folk that had content try to fix a non-fatal failure like this before they get their tape content out.
Hi, i recently found this old camcorder in basement it's from my dad, When i charged battery and turn on camcorder all functions are working except picture in viewfinder. I don't have cassette, is that problem or malfunctioned? The camera is left unused 25 years and when is prepared for storage then it worked.