I have a 6 year-old Sony SLV-775HF VCR. Not the best unit for any means, but adequate for limited VHS playback. My problem is that the unit's video output has stopped working. Audio output and both video/audio input (e.g., recording) work fine. The unit has been used maybe 10x over the last 3 years (house with 3 DVD players and 2 PVRs) and I'd like to keep it if possible. Could one of those $5 head-cleaning units from K-Mart fix the problem? All suggestions would be appreciated. Thanks!