Apparatus recording and reproducing video and audio signals using a tape width of 8 mm, was fairly widespread in the world, including in our country. On existing formats, their differences and manufactured models described in this article. It also discusses the design of LSM, for the model SAMSUNG recommendations upon disassembly and repair.
This year marks 20 years since the release in 1983 by SONY first models of VCRs (VMS) and video cameras (VC), working with magnetic tape width 8 mm. in spite of the transition to digital technology in recording image signals and sound on magnetic, optical media and even solid-state (semiconductor) devices, continue to produce in large quantities of analog video equipment, including VC formats 8 mm. Park this instrument, including in Russia, are very significant. However, the large the percentage of it is machines, already exhausted of work and requiring repair or maintenance.
For a successful service events with them the necessary technical literature, performance documentation, spare parts, special tools and measuring equipment. To unfortunately, the information on the 8 mm formats we have available mainly in the the General form. It is quite insufficient to repair and maintenance of concrete equipment, and to use information on models VHS(S-VHS) for this purpose difficult because of the many significant differences in circuitry and constructive features. Therefore, you should tell us more about the device and the service VC 8 mm formats, their differences from the equipment of other formats.
Calling the new VIDEO format-8 (abbreviated V8), SONY in 1988 began to produce and equipment high-quality version called HI-8 (HI8). Since VK V8/HI8 continuously improved. Production was expanded to include other famous company: HITACHI, CANON, SHARP, SAMSUNG, SANYO and a number of firms (GRUNDIG, MINOLTA, NOKIA, PENTAX, OLIMPUS, RICON, etc.), procuring equipment from above listed. Most of the improvements concerned consumer characteristics of VC (modes, special effects, credits, image stabilization etc.).
However, in the late 90-ies of the firm SONY has significantly improved and main technical the parameters of the VC. This primarily relates to the resolution the image horizontally. A technology that allows to increase the resolution, got the name XR-Extended Resolution. Therefore, the formats received in the name of this console: VIDEO-8XR/HI-8XR. Moreover, their compatibility with conventional equipment V8/HI8 preserved. The achieved increase in resolution compared with 250 and 400 lines of conventional VC V8/HI8 accordingly made in the best models VK V8XR 300 lines, and in the VC HI8XR - 450 lines horizontal. Especially it is necessary to emphasize that in such VC image clarity depends largely on the characteristics of the Converter light/signal and primarily on the number of active pixels of the CCD matrix and its size (measured in inches).
For example, we list the number of pixels in the lineup VC SONY from directory [1].
Format HI8XR: CCD-TR3200 - 440000, CCD-TR840/845 - 520000, CCD-TRV300 - 440000, CCD-TRV99/89 - 360000; Format V8XR: CCD-TR730 - 360000, CCD-TR640 - 520000, CCD-TR512/511 - 290000, CCD-TR412/411 - 290000.
Noteworthy that in the VC CCD-TRV99/89 (HI8XR) and CCD-TR730 (V8XR) applied matrix CCD with the same number of pixels, and the model CCD-TR640 set matrix CCD with overly large for the entries in the V8 format number pixels. It must be remembered when buying VC, as for the image quality when playing a recording made some model formats V8XR and are HI8XR equivalent (of course, only by definition).
A brief look at some of the most significant innovations applied in the VC formats V8(XR)/HI8(XR). NIGHT SHOT - shooting in total darkness (SONY 1998 G.) - released when disconnecting the optical filter, the overwhelming infrared rays, and the illumination of the objects embedded in the VC source of infrared radiation. You can to shoot images in black and white at a distance of 5...6 m New video heads HYPERMIG in combination with XR technology allows to improve the ratio signal/noise 30% luminance 10 % on the chrominance signal. Technology STAMINA (SONY 1998) - optimization of energy consumption - provides continuous work up to 12 hours on a single charge of the lithium ion batteries. Smart the INFO LITHIUM batteries (SONY, 1998) informed about possible time with them with an accuracy of 1 min STEADYSHOT System and SUPERSTEADYSHOT (SONY) guarantee a maximum compensation of image jitter with optical prisms or special matrix on the CCD 8000000 pixels. Applied LASER system LINK distance transmission (up to 10 m) image signals and audio on the IR rays. Connected to the TV receiver IR rays SONY IFT-R10 usually put optional (for a fee). Received digital effects during recording: freeze-frame, sampling technique, stretching/shrinking, etc.
In the spring of 1999, the company SONY has started selling the VC of the new digital format DIGITAL 8 (D8). And this despite the fact that by that time most manufacturers focused on a single digital format for consumer recording MINI DV, including SONY itself produces a whole range of such models. Potential format D8 is very high: digital recording is provided on serial videos HI8, and they are almost three times cheaper MINI DV cassettes that allow you to play VC recording formats: V8/HI8, prices for model D8 lower than MINI DV cameras. These three factor can significantly extend the life of equipment video formats 8 mm.
By the end of 2000 on the Russian market were 10 models of digital VC D8 SONY and about 40 models of MINI DV CANON, JVC, PANASONIC, SONY, SHARP, THOMSON. Pictures D8 VC - 800 to $ 1,400. (the cheapest - SONY - DCR-TRV120), and EK MINI DV from 950 to $ 3,000. (the cheap - PANASONIC - NV-DS11EN). In the same year a new format was supported by company HITACHI, releasing two models VK D8: VMD-865LA and VMD-965LA.
Consider the technical features and specifications D8 VC in comparison with models formats V8/HI8, details of which are given in [2, 3]. In the VC D8 tripled speed urh - 4500 rpm Speed strap also increased to 28,7 mm/sec. In the VC V8 (PAL, SP) is equal 20,05 mm/s. This is due to not very high performance magnetic tapes HI8. Increase the speed of their Assembly, naturally, resulted in reduced recording time: two-hour cassette HI8 enough at 1 h 20 min, and one-hour - 40 min. Regrettably, high speed head/tape reduces the life of video heads.
With increasing speeds has undergone change and signalosome. In D8 format each frame is recorded in the six (PAL) or five (NTSC) inclined lines, and each of them is recorded by two video heads (they switch in the middle of the tape). In addition, due to the reduction of the width of the record tracks need to resize, and the length of the gaps of the video heads to about 16 microns. In the V8 format width of the record track - 34,4 (PAL) or 20.5 (NTSC) µm.
500 lines horizontal resolution is format D8. Except the new VC is provided a digital device I. LINK with access to the bus data, international standard IEEE1394 when transmission speeds from 100 to 400 M B/S. Via device I. LINK possible "digitization" of records in formats V8/HI8, and in some models - and external signals. PC connectivity can be provided by using special miniature memory card STICK media with capacity of up to 8 MB up to 128 MB. A special slot for cards have all VC SONY second generation (2000-2001 edition). There are models, which is equipped with color printer to print photos size 5x9 cm from the buffer memory or a flash memory inserted in the same slot MEMORY STICK (SONY model - DCR-TRV820).
The aspects of service and repair models for new generations of equipment 8 mm we will occur not soon. Therefore, consider the features of the circuitry, design and functioning of the most common we have VK V8. Their principal differences from the VC VHS/VHS-C only concern videomagician sections. Chamber head, control systems, electric drives, power supplies, network adapters and some other nodes do not have such differences (only schematic). But videomagician in the VC section of the reporting formats differ significantly as in the construction of the automatic control systems (ATS), channels of image and sound, and in the construction of LSM.
Indicate the most significant differences VK V8 ("eights") from VHS equipment. IN SAR drive shaft phase channel "eights" is based on the use of signals auto-tracking (ATF), a recordable and reproducible by the rotating video heads. In General, the concept of "tracking" for the users of the VC is missing (no such regulators), and problems with the playback of recordings made on a different VC. Analog signals of image and sound (FM) are recorded and replayed those same heads. However, it is possible to record sound signals by PCM. In most models VC no of channels of sound using stationary universal and erase heads. Therefore, in LSM "eights" virtually no stationary heads, although by the format provides for longitudinal V8 tracks audio and control signals, but in VC they usually do not use.
A significant number of faults VC occurs because of wear and tear mechanical components of LSM. Often failures of electronic assemblies VK happen when tucked the cassette further extracted without disassembly of the mechanism impossible. Therefore, for effective repairs must clear an overview of the structure of LSM and the ability to develop/build.
Since the release of the first VC of 8 mm format developed many types of LSM, large some based on technical solutions and patents from SONY. More often all CVL have mine loading of the cassette. However, in mounting the VM V8/HI8 use front-loading, as in VHS machines. Such a VM is the device SONY - EV-part no c3e release 1989-1992 He has an LPM with four engines providing a drive Rhu and EXPLOSIVES, filling cassettes and tapes.
This network device dimensions 178x88x255 mm and weight 2.2 kg, in addition to the usual of functions that allows you to mount the video data synchronously with VC SONY, equipped special interface CONTROL LANK (five-pin connector CONTROL-L). Rhu with three magnetic heads used in this VM, is used in many models VC SONY release early 90-ies with LSM type U (U). His device presented in the manual [4], available at radio.
The cassette compartment mechanism U mine type rigidly mounted on stamped base. Approximate dimensions LSM installed videocassette - 120x105x40 mm.
To reduce the dimensions of the VK LSM have undergone substantial changes. In particular, caseoriented began to perform in the form of retractable structures which reduced them to the size 90x105x35 mm. So is made of LSM (mechanism C) more than four dozen models VK SONY release 1997-1999 Mechanism In rigidly standardized. It is used as VC expensive HI8 (for example, CCD-TR3100E, 1250$) and relatively cheap VC VIDE08 (CCD-TR420E, 440 dollars). Different LSM various VC this series only type installed Rhu. The composition the line includes the following VC SONY: CCD-TR330/340/401/402/420/440/ 510/520/3100/3400; CCD-TRV10/11/ 12/14/21 /22/24/31 /32/34/44/51 /52/53 /54/56/61 /62/64/72/81 /82/91 /94/112/ 212/312/512 and some others. .
For ordering spare parts when carrying out repairs it is necessary to know the number details on the specs of the mechanism In (8 mm MECHANISM DECK, SONY B-MECHANISM). Their can be found in the manual [5], sold at radio.
The retractable design of the cassette used in some models of the firm SAMSUNG. The LSM device, especially its disassembly and repair consider example camcorder SAMSUNG VP-U12/U15. Its design demonstrate Fig. 1 and 2.
Numerals in Fig. 1 is displayed: 1 and 2 - conclusions from dvigatelya refueling; 3 - urh; 4 - driving motor; 5 - gear winding; 6 - cassette receiver; 7 - presser roller; 8 - right smart host; 9 - left smart host; 10 - software switch; 11 - gear software; 12 - engine refueling.
In Fig. 2 numerals marked connectors: 1-engine gas stations; 2 - the bottom part of the recorder; 3 - rotating transformer urh; 4 - motor drum; 5 - BB engine; 6 - cassette.
In Fig. 3 shows a bottom view of the cassette V8. It numbers indicate: 1 - inner lid; 2 - Central hole LEDs; 3 - outer cover; 4 snap caps; 5 - holes for fixing the cassette; 6 - identification hole.
Of practical interest is the method of disassembly of LSM is defective, i.e. not signs of life VK with refilled cartridge. To remove, take off the cassette cover (Unscrew two screws), plastic sealing ring (located just behind the lens, Unscrew one screw from the bottom), the node microphone (four screws) and right side cover (two screws in the back, four screws bottom). This opens access to LSM on top. Forced eject magazine serves the DC voltage 4...6 In the conclusions of the engine 12 refills (see Fig. 1) first disable the connector 1 (see Fig. 2): negative lead from the power source is connected to the output 1 (see Fig. 1), and the positive to pin 2, include some of these chains any button.
Surgery need to spend in small increments by pressing this button. First stop do when the cassette 6 as it moves forward, will free access to the gear the winding 5. Turning the gear with a thin screwdriver counterclockwise take a loop of tape inside the cassettes. Again apply power button until the cassette compartment will not rise up and it will be possible to extract the tape.
Repair LSM need to produce, using the service manual (SERVICE MANUAL). Experienced technician can disassemble the mechanism self. However, it should be sure to record the order of operations disassembly, type of fasteners, and sketching typical configuration details mechanism and their base. This will allow without any problems again camera.
If necessary, purchase or order of the parts of the mechanism and specialized electronic components in the service centers need to know the names of parts and part numbers (PART NO).
For repair of the considered models SAMSUNG VC in the first place can need the following components and parts: Rhu - ass'y-DRUM (ass'y - Assembly), DE-4UPN-SS (PART NO - 69063-214-360); the cassette - HOUSING-ASS"Y, STS304/ STS303TO5DE4 (PART NO - 620051-0012-00); engine gas stations - MOTOR-LOADING, DE-4U (PART NO - 66823-0055-00); lead engine - MOTOR-CAPSTAN, DE-4U (PART NO - 66823-0047-00); roller - PINCH ARM RASS'Y, DE-4A (PART NO - 61543-0063-00); software switch - SWITCH-MODE ass'y, SRZZOA083ADE-4U (PART NO - 66202-0012-01); gear software - ass'y-GEAR CAM MAIN, DE-4A (PART NO - 69063-214-244).
Literature
Author: J. Peter and Paul, Taganrog