I merged your duplicate threads.
Error F04 is listed early in the Panasonic AG-1980 service manual.
Download:
http://www.digitalfaq.com/forum/atta...g1980p-service
Panasonic AG1980P Service Manual VSD9509M264.jpg
It's a tape jam that's detected during the power on self test.
The motor may be bad, or there may be something gumming up the works -- like a dust bunny.
$150 is a great price, should you decide to sell.
List it in the marketplace, if you do:
http://www.digitalFAQ.com/forum/marketplace/ .... it's free.
You can always send it off to a place like Jots, and get it professionally repaired for $150-250, depending on what's wrong, if you're unable to get it working yourself.
I would point out, however, that this unit cannot "passthrough" any of the TBC or other filters. Those only function on playback. The only thing passed through is uncorrected signals. The Panasonic ES10 DVD recorder is, by contrast, an example of one of the rare units that does pass through corrective filter processing.
... and welcome to the site.