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If you have any questions, please feel free to contact me. Here is the product description of the CR70 Sencore CR70 Beam Builder Universal CRT Analyzer and Restorer * Electrical Requirements: 105 – 125 Volts AC, 50/60 Hz, 90 Watts The Sencore CR70 “Beam Builder†Universal CRT Analyzer and Restorer is designed to test and restore any type of CRT (Cathode Ray Tube). The tests analyze each type of possible electron gun failure to provide accurate information about the ability of the gun assembly to produce an electron beam with the correct specifications. This information helps you decide whether the CRT will continue to operate in the circuit, whether you should attempt to improve its condition with the CR70 “Beam Builder†functions, or whether it should be replaced. The beam building functions provide five different levels of cathode improvement, providing the correct type of restoration or rejuvenation needed to improve most defective CRTs with the safest cathode recovery methods possible. You use the test results to guide you through the beam building steps. Features: The CR70 tests each gun and each element individually, using dynamic tests which simulate the CRT in actual operation. The tests confirm that there are no inter-element shorts, that each gun has the correct dynamic range (range of cathode current between darkest and brightest display) and that each gun has enough emission level to produce an acceptable image on the CRT screen. Color reproduction problems are readily identified with patented color tracking test, which compares the emission levels of all three-tube projection system, to confirm the three colors can be properly balanced against each other. The CR70 provides five types of cathode recovery to allow you to use enough current to do the job effectively, without applying more than would be safe for a particular type of CRT failure. The CR70 meter monitors the amount of restoring current, allowing you to control the results. The CR70 operates on only one gun of a color CRT at a time allowing the beam building action for each gun. The design of the CR70 allows the use of the fewest number of adapter sockets possible. Because of its unique design, the CR70 is virtually obsolete proof. Unlike other CRT testers, the CR70 requires only one adapter socket for each type of CRT base. Setup switches let you compensate for different wiring configurations for a single style of socket. The setup switches relate directly to the pins of the CRT, allowing a schematic to be used to determine the testing information for a CRT that is not listed in the CR70 setup book. Specifications: Shorts Tests: H-K Shorts – 2 megohm good/bad calibration, ±10%; G1 Shorts – 20 megohm good/bad calibration, ±10% Emission Test: G1 Bias: Zero volts; Good/Bad Emission Level: Video CRTs, 300 uA ±5%; Projection CRTs, 800 uA ±5%; Scope CRTs, 10 uA ±5% Cutoff Test: G1 Bias: Switch selectable; -20, -36, -52, or -68 VDC; Calibration Current: Video CRTs, 10 uA to 20 uA ±5%; Projection CRTs, 26 uA to 53 uA ±5%; Scope CRTs, .33 uA to .66 uA ±5% Tracking: Method, : Stored emission current levels compared between highest and lowest guns, ratio indicated on meter. Good/Bad Calibration: 1.55:1; Minimum Memory Time: 15 minutes. Remove G1 Shorts: Method, capacitive-discharge; Applied voltage, 450 VDC; Discharge Time, automatically determined by CRT under test. Filament voltage removed to prevent damage to filament Rejuvenation: Method, capacitive-discharge; Applied voltage, 450 VDC; Discharge Time, automatically determined by CRT under test Restoration: Method: Cathode super-heating using elevated filament voltage and increased beam current. Current Levels: Video and Projection CRTs, 100 mA for auto and Manual 1, 150 mA for Manual 2; Scope CRTs, 75 mA for auto and Manual 1, 100 mA for Manual 2; Auto restore time: Nominal 4 seconds on and 2 seconds off for 3 cycles. Manual 1 and Manual 2 times: Determined by user. Filament Voltage: Continuously variable from 1 – 14 volts; Meter accuracy ±5%, calibrated at 6.3 volts at 900 mA; Life Test: Lowers filament voltage 25%, ±10%; Restore: Increases filament voltage by 50%, ±10% Meter: 4â€, 100 uA, 2%, 4000 ohms Dimensions: 7 ½†x 14†x 9 ¾†(Sencore CR70 "beam builder" crt analyzer was posted and is owned by: Martha Anderson) |
m-anderson@chicagopartsnetwork.com (Martha Anderson) for more information.
