DVC HOUSEKEEPING
The mechanics of a DVC deck are virtually identical to those of conventional small video decks, especially the Video 8 types with extra-small (4-head system) head drums, though very close mechanical tolerances are required in the tape path at and near the head drum in order to consistently scan helical tracks just ten microns wide. For the same reason the lower drum must be kept very clean, and adjust- ment of entry and exit tape guides is a very exacting task. The same types of mechanical systems are used for tape threading, tape- and spool-drive, reel braking, tension regulation etc., and the system- control sensors on the deck are similar in type and application to those on conventional decks. Likewise the tracking servo system is very similar to Video 8 ATF operation, and may be applied during replay to either the capstan or the drum for tracking control when speeds are correct. The system control section, at least in respect of the deck operation, is the same as those used in other VCRs and camcorders.