UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - VCR mild horizontal picture oscillation possible causes

TIMTAPE · 8th Jun 2021, 12:42 pm

VCR's arent my strongest suit. I have been working on a Sony Betacam PVE 2800P pro recorder as pictured. After retrieving the pinch roller and shaft rattling around inside the deck and refitting it, and after a general clean and lube of the deck mechanism it basically works. Picture clean and strong, but there is a small gentle oscillation of the complete picture, left, right, left etc, at about 1 or 2 Hz, almost like an overshoot from an underdamped servo. It's more visible with no camera movement.

I've not seen this type of oscillation in consumer VCRs but if you have and have an idea as to what might have caused it there, it might be relevent to this VCR also.

I'm guessing in this oldish deck, capacitors, but in which area of the picture circuitry? Any ideas or tips appreciated.

Thanks,Tim

8th Jun 2021, 12:42 pm	#1
TIMTAPE Octode Join Date: Jul 2006 Location: Perth, Western Australia Posts: 1,969	VCR mild horizontal picture oscillation possible causes VCR's arent my strongest suit. I have been working on a Sony Betacam PVE 2800P pro recorder as pictured. After retrieving the pinch roller and shaft rattling around inside the deck and refitting it, and after a general clean and lube of the deck mechanism it basically works. Picture clean and strong, but there is a small gentle oscillation of the complete picture, left, right, left etc, at about 1 or 2 Hz, almost like an overshoot from an underdamped servo. It's more visible with no camera movement. I've not seen this type of oscillation in consumer VCRs but if you have and have an idea as to what might have caused it there, it might be relevent to this VCR also. I'm guessing in this oldish deck, capacitors, but in which area of the picture circuitry? Any ideas or tips appreciated. Thanks,Tim Attached Thumbnails Last edited by TIMTAPE; 8th Jun 2021 at 1:05 pm.