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I can't find one online either but the AG-DS850 manual should be extremely close if not the same (I can't see any differences in the front/rear controls except the model#): You can download the 850 manual here: ftp://ftp.panasonic.com/provideo/om/agds850_en_om.pdf
This is a typical symptom of a power supply failure. There are some self-checks performed at power-up that are not completing correctly. Were there any symptoms before the complete failure? Often, the units start to behave strangely before complete shutdown. The power supply failure is tied to defective capacitors in most cases. These supplies are what are called "switch-mode" supplies and must oscillate to work. Defective caps will either not provide the kikcker to start the oscillation or prevent the oscillation completely. While there are other causes, this is the most common. AG units are professional decks and should be serviced by authorized service centers.
change in stability after warm-up is a sign of defective capacitors. the DS550 and DS850 both are notorious for capacitor failures. don't touch the trim pots unless you have a service manual and a wfm/vectorscope.
AG-DS555s are plagued by capacitor failure problems on all the video boards in the deck. Replacement of all surface mount electrolytic capacitors is the solution, but before you try that, give the heads a good cleaning. It's amazing what a miniscule amount of dirt on the heads will do.
Do you route your Cable / Antenna through your VCR's Inputs (at rear) ? If yes, Do you find that the video of these cable /antenna channels is good? If the answer is yes again,then, in all likelihood, you are having a machine with dirty Video Heads.Did you use a 'Wet' Type Head cleaning cassette? If no, then I suggest you get one and use it.
Again it is entirely possible that the Video Heads are worn out. How old is the VCR? How many tapes have you played back on it? Do you observe some black streaking along the edges of the images on the screen, which increase or decrease when u change the tracking? If yes, then it is time to get the Video Heads replaced.In India they would cost an equivalent of US$ 10-15. I do not know how much they would cost in your country, but it cannot be much more.