Sony U-Matic 3/4“ Tape Deck - Repair Time Lapse

Sony U-Matic 3/4“ Tape Deck - Repair Time Lapse. U-matic is an analogue recording videocassette format first shown by Sony in prototype in October 1969, and introduced to the market in September 1971. It was among the first video formats to contain the videotape inside a cassette, as opposed to the various reel-to-reel or open-reel formats of the time. The videotape is 3⁄4 in (19 mm) wide, so the format is often known as “three-quarter-inch“ or simply “three-quarter“, compared to open reel videotape formats in use, such as 1 in (25 mm) type C videotape and 2 in (51 mm) quadruplex videotape. Unlike most other cassette-based tape formats, the supply and take-up reels in the cassette turn in opposite directions during playback, fast-forward, and rewind: one reel would run clockwise while the other would run counter-clockwise. A locking mechanism integral to each cassette case secures the tape hubs during transportation to keep the tape wound tightly on the hubs. Once the cassette is taken off the case, the hubs are free to spin. A spring-loaded tape cover door protects the tape from damage; when the cassette is inserted into the VCR, the door is released and is opened, enabling the VCR mechanism to spool the tape around the spinning video drum. Accidental recording is prevented by the absence of a red plastic button fitted to a hole on the bottom surface of the tape; removal of the button disabled recording. U-matic is also available in a smaller cassette size, officially known as U-Matic S. Much like VHS-C, U-Matic S was developed as a more portable version of U-Matic, to be used in smaller-sized S-format recorders such as the aforementioned Sony VO-3800, as well as the later VO-4800, VO-6800, VO-8800, BVU-50, BVU-100 and BVU-150 models from Sony, among others from Sony, Panasonic, JVC and other manufacturers. To minimize weight and bulk in the field, portable recorders had an external AC power supply, or could be operated from rechargeable nickel-cadmium batteries. The price point of the VO series was oriented toward educational, corporate and industrial fields, featured unbalanced audio connectors, and did not typically include SMPTE time code (although one or two companies offered after-market modification services to install longitudinal time code). The VO-3800 was largely metal, which made the unit heavy, but still technically portable. The VO-4800 had the same functionality as the VO-3800, but at a greatly reduced weight and size, by replacing many components with plastic. The VO-6800 added the improvement of a long, thin battery standard (“candy bars“) that permitted storage of the batteries in a trouser pocket. Common model numbers for these batteries were NP-1, NP-1A and NP-1B. The VO-8800 was the last of the portable VO series to be produced by Sony, and featured solenoid-controlled transport. The Sony BVU series added longitudinal and vertical interval SMPTE time code, balanced audio XLR connectors, and heavier-duty transport features. The BVU-50 enabled recording in the field but not playback, and the BVU-100 permitted both recording and playback in the field. Portable recorders were connected to the camera with a multi-conductor cable terminated with multi-pin connectors on each end. The cable carried bi-directional audio, video, synchronisation, record on/off control, and power. Early studio and all portable U-Matic VCRs had a drawer-type mechanism which required the tape to be inserted, followed by manual closure of the drawer (a “top-loading“ mechanism). Later studio VCRs accepted the cassette from a port opening and the cassette was pulled into and seated in the transport (a “front-loading“ mechanism). In 1976, Sony introduced the semi backwards-compatible high-band Broadcast Video U-matic (BVU) format.[9] The original U-matic format became known as low-band. The BVU format had an improved colour recording system and lower noise levels. BVU gained immense popularity in ENG and location programme-making, spelling the end of 16 mm film in everyday production. By the early 1990s, Sony’s 1⁄2 in (1.3 cm) Betacam SP format had all but replaced BVU outside of corporate and budget programme making. With BVU 800 series, Sony made a final improvement to BVU, by further improving the recording system and giving it the same “SP“ suffix as Betacam. SP had a horizontal resolution of 330 lines. The BVU 800 series Y-FM carrier frequency was upped to 1.2 MHz giving it wider bandwidth. BVU 800 series also added Dolby audio noise reduction. Sony’s BVU 900 series was the last U-matic VTR made by Sony. First-generation BVU-SP and Beta-SP recordings were hard to tell apart, but despite this the writing was on the wall for the U-matic family, due to intrinsic problems with the format. #SonyUMatic #Howtofixavcr #BroadcastVideoRepair