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Service Manual SERVICE MANUAL TapeChek Model 4100 Betacam SP Cassette Cleaner/Evaluator Research Technology, International Version 1.3 Table of Contents ______________________________________ Section: Page 1) Repair/Return Procedure 3 - 4 2) General Description and 4100 Specifications 5 - 10 3) Diagnostic Displays 11 - 14 4) Mechanical Adjustments 15 - 18 5) Defect Detector Module 19 - 21 6) Electronic Adjustments and Repairs 22 - 25 Appendices: A) Primary Service Parts List B) Circuit Diagrams 2 Repair/Return Procedure __________________________________________ The Tapechek 4100 Betacam SP Evaluator/Cleaner is a professional unit for the high speed processing of large and small Betacam plus Betacam SP (metal) cassettes. This machine is built to the highest standards of quality and performance. It runs the tape at 25 times NTSC play speed which translates to 120 inches per second. At these high speeds, at great deal of dust, loose oxide and debris can accummulate in the machine which can cause some types of failures. TO PREVENT MOST MACHINE PROBLEMS, CLEAN THE MACHINE MECHANISMS REGULARILY! Do not, however, use flammable or corrosive solvents. The machine is fully warranteed, when new (check your warranty statement) to be free of manufacturing defects and to perform properly. If problems are found during the warranty period, they will be handled according to the warranty. After the warranty period, RTI and its service dealers will assist, at a reasonable charge, with parts and labor to address problems if they arise. Telephone assistance is available, at no charge, to answer your questions. In many cases the repairs can be done on location by simple replacement of a part or assembly. However, sometimes the repair requires a critical adjustment or the trained eye of our factory technicians. In these cases, the machine should be returned to RTI or one of its service dealers to be repaired. Please note the following: Important _______________________ Call RTI or Service Dealer for assistance before attempting any repairs to the machine. Our trained personnel can, in many cases, diagnose the problem on the phone! Call for a Return Authorization Number before shipping unit to the factory. If factory repair/return of your unit is required, you must send the unit back in its carton with original shipping materials, etc. to prevent shipping damage! 3 SAFETY PRECAUTIONS 1. Read these warnings, the installation instructions, and the operating instructions before using the model 4100. These precautions are for your own safety. 2. Follow all warnings and instructions marked on the product and in the manual. 3. Do not use this product in or near water, it may cause electrical shock. 4. Unplug this product from the power source before opening the case. 5. Do not place this product on an unstable cart, stand, or table. It may fall, causing personal injury. 6. Slots or openings in the cabinets are provided for ventilation. These openings must not be blocked to insure proper operation. 7. Do not allow anything to rest on the power cord. Do not locate this product where people can step on the power cord or trip on it. 8. If an extension cord is used with this product, be sure that the total ampere ratings of all the loads plugged into the extension cord do not exceed the ampere rating of the extension cord. 9. Never push objects of any kind into the openings of electronic equipment as they may contact dangerous voltages, causing a risk of electrical shock or fire. Never spill liquid of any kind on this product or use flammable solvents to clean the mechanisms.. 10. Save the shipping container and packing materials. In case unit ever requires factory service, you must use these materials to assure proper packing. 4 GENERAL DESCRIPTION Your TapeChek 4100 Cleaner/Evaluator will in the Lower channel. However, it will only process your NTSC Betacam and Betacam SP be counted as one defect in the total. Rather tape cassettes at 25 times normal playing than counting individual fluctuations in light speed (slightly higher for PAL tapes). The Pro reflected from the tape, the machine counts the Line units accept both small and large number of seconds of videotape that contain Betacam/Betacam SP cassettes. defects. This produces a more meaningful defect report and display. For example, a CLEANING continuous edge damage might consist of 92 The machine uses two sapphire burnishing little variations in the tape over a one second posts and three cleaning tissue stations which length of videotape. If the machine reported a have vacuum assistance. The burnishers defect count of 92, one would think that the polish the tape thoroughly in forward and tape is totally bad and unusable. But this is reverse directions. There are two cleaning not the case since only one second of tissues on the oxide (metal) side of the tape videotape was actually affected by the and one cleaning tissue on the back side of the damage. tape. A vacuum system helps to transfer the lose debris from the videotape into the fibers SWITCHES/DISPLAYS of the cleaning tissue for more effective The back lighted LCD display offers many dropout removal. Since most videotape different displays and operator messages. dropouts are due to dust, dirt and surface There are three keyboards or "switch clusters" contaminants, you will find that the TapeChek on the front panel of the machine. The upper 4100 cleaning system will substantially reduce switch cluster has the switches relating to tape the number of dropouts in your videotapes. transport functions, such as Stop, Automatic, Older, more heavily used tapes will show an Forward, Reverse, etc. The main power switch even greater dropout removal. for the machine is also located here. After the operator carefully inserts the cassette in the DETECTION loading slot (centering a small cassette In addition to the cleaning and polishing between the raised guides), the operator will systems, the TapeChek 4100 employs a very typically push the AUTO switch to start the sensitive defect detection system. This is an automatic evaluating and cleaning cycle. (See optical defect detection system that will not Operating Instructions Section). alter or affect pre-recorded tapes. The videotape is inspected by a CCD(charge AUTOMATIC OPERATION coupled device) sensor which is capable of After the tape is run to its end, the machine detecting wrinkles, creases and edge damage. will gently stop and automatically reverse. It Unlike other defect detection systems, the is during the reverse cycle that the defect CCD detector is very sensitive to longitudinal detector inspects the tape for physical damage. creases, a common form of tape damage. Of course, the tape is cleaned and polished There are 64 elements, grouped into three during the forward and the reverse modes. channels: Upper, Center, Lower. After the automatic cycle is finished, the machine will eject the tape. It is then possible Sometimes the defect will only appear in one to receive a printed report of the tape of the channels, however, a crease all the way inspection if the unit is equipped with the across the tape will count once in the Upper optional printer. channel, once in the Center channel and once 5 TAPE CONDITION as is the rest of the Pro Line machine The right hand keyboard shows the "A", "B", Therefore, if the POWER switch is turned off and "C" tape condition lights. The factory while a cassette is in the machine, instead of settings are such that a tape which has 0, 1 or 2 turning off immediately, the machine will eject defects is considered an "A" tape, 3 through 9 the cassette and then power down. Since the defects are considered a "B" tape, and ten or entire machine is microprocessor controlled, it more defects is indicated as a "C" tape is very gentle to the tape and monitors tape condition. By pressing the SET-UP key the tension and speed continuously during the operator may change the values for the "A", evaluation and cleaning cycle. Also, if a "B", and "C" tape condition. cassette is inserted incorrectly, the machine will automatically eject the cassette so that the SMART ELECTRONICS operator can try again. If a tape is loaded and The TapeChek 4100 is a fully automatic will not run, it is possible that one of the machine with sensors to detect cassette size, cleaning tissues has been exhausted and needs erase protection tabs, and many other machine to be replaced. In this cases a message is functions. The POWER switch on the front shown on the display panel. panel is actually under microprocessor control MACHINE SPECIFICATIONS TAPE TRANSPORT SYSTEM: 25 times NTSC Betacam tape speed (approximately 120 ips.) • Capstanless dual-motor spindle drive • Metallic leader sensing system • Tape accumulators prevent excess tape tension and provide gentle tape handling. • Tape speed and tension are constantly monitored by microprocessor electronics. • Infra-red detection systems for cassette size and loading sensors. • DISPLAY AND SWITCHES:-Six lighted transport key switches • LCD display (2 line by 16 char.) provides operator messages and tape data. Adjustable back light control. • Three LED "Tape Condition" indicators. • Tape data input keys and numeric keypad. TAPE CLEANING SYSTEM: Two sapphire burnishing stations. • Three vacuum-assisted cleaning systems. • Automatic tissue advance in Forward and Rewind. 6 DETECTION SYSTEM: Optical defect sensing system, using CCD line array and associated electronics. Detects longitudinal and transverse creases, wrinkles, and other physical defects. • Three-channel system identifies the area of tape containing damage. • location and number of defects are reported on the display and by the optional printer. OPERATOR CONTROLS: Three Switch clusters contain switches for the tape transport system, display and data entry systems, and the option printer system. ELECTRONICS: • Microprocessor based control system with ROM and battery backup RAM memory devices.
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