Videotek TVM-821D Service And Instruction Manual

Serial digital component monitor/vectorscope

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TVM-821D
Serial Digital Component
Monitor/Vectorscope
Service & Instruction Manual
Videotek, Inc. warrants that this product is free from defects in materials and workmanship for a period of two years from the
date of purchase, except for CRTs and LCDs, which are warranted for a period of one year. During this warranty period,
Videotek will, at its option, repair or replace defective products at no charge for the parts or labor. Batteries are not covered
in the warranty.
For warranty service or repair, this product must be returned to a service facility designated by Videotek in the original
packing or its equivalent. The purchaser shall insure the product and prepay shipping charges to Videotek, and Videotek
shall insure the product and pay shipping charges to return the product to the purchaser.
The foregoing warranty shall not apply to defects or damage resulting from improper or inadequate maintenance by the
purchaser, connecting the product to incompatible equipment, misuses, operation outside any environmental specification for
the product, improper site preparation or maintenance, or attempts by personnel other than authorized Videotek
representatives to repair or service the product.
No other warranty is expressed or implied. Videotek specifically disclaims the implied warranties of merchantability and
fitness for a particular purpose. The remedies provided by the foregoing warranty are the purchaser's sole and exclusive
remedies. Videotek shall not be liable for any direct, indirect, special, incidental or consequential damages, whether based on
contract, tort, or otherwise.
Printed May 2006
Item #061711 Rev. B
Copyright © 1997 - 2006 by Videotek, Inc.
All rights reserved.
Contents of this publication may not be reproduced in any form without permission of Videotek, Inc.
This instrument, in whole or in part, may be protected by one or more US or foreign patents or patent applications.
Specifications subject to change without notice.
____________________________________________________________________________________________________________
Videotek and the Videotek logo are registered trademarks of Videotek, Inc.
TWO-YEAR LIMITED WARRANTY

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Not all the pages are here. Its stops at Page 29

Summary of Contents for Videotek TVM-821D

  • Page 1 TWO-YEAR LIMITED WARRANTY Videotek, Inc. warrants that this product is free from defects in materials and workmanship for a period of two years from the date of purchase, except for CRTs and LCDs, which are warranted for a period of one year. During this warranty period, Videotek will, at its option, repair or replace defective products at no charge for the parts or labor.
  • Page 2 Blank Page...
  • Page 3 OPERATOR'S SAFETY SUMMARY Refer all servicing to qualified service personnel To maintain and to ensure safe operation, observe the following instructions, symbols and precautions. 1. When the unit is to be permanently cabled, first connect protective ground conductor before making any other connections.
  • Page 4 BLANK PAGE...
  • Page 5: Table Of Contents

    Table of Contents Features ............Specifications .
  • Page 6 Exploded View of TVM-821D ........
  • Page 7: Features

    Other functions include LED alarms to alert the operator of EDH, EAV and SAV data problems. Add this to Videotek's long history of making high quality test instruments, the TVM-821D is the perfect test solution for editing, production and post production, broadcast and remote vehicles.
  • Page 8: Specifications

    Specifications VIDEO AMPLITUDE : 700 mV ± 0.5% VECTOR MODE : Provides vector centering dot INPUTS : Two 270 Mb/s 4:2:2 serial digital video CONNECTORS : BNC female IMPEDANCE : 75 S nominal passive loop through MULTIPLE DISPLAY MODE MEASUREMENT ACCURACY RETURN LOSS : $ 18 dB to 270 MHz LEVEL : 800 mV p-p ±...
  • Page 9: Installation Instructions

    +4 dBm COOLING OF THE TVM-821D +8 dBm The TVM-821D is cooled by an exhaust fan at the rear of the unit. For proper air circulation, a minimum of 1.75 inches should be +12 dBm maintained above and below the unit. Care should be taken not to block the exhaust fan at the rear of the unit.
  • Page 10: Front & Back Panel Controls

    V. POS VECT FMT 100% VECTOR POWER ERROR REFERENCE VIDEOTEK GAMUT DATA T VM-821D FRONT VIEW ternally generated precision 100 kHz square-wave and a vector cen- LEFT CONTROL PANEL tering dot. INTENSITY - Knob which controls the brightness of the CRT beam.
  • Page 11 REAR PANEL EDH - Indicates the presence and status of the Error Detection and The rear panel of the TVM-821D consists of four digital video input Handling (EDH). Green represents a valid EDH calculation and red BNC connectors, two analog video reference input BNC connectors, represents an EDH error.
  • Page 12: Operating Instructions

    WFM only. Each press of the DISPLAY button cycles through the available modes. MEMORY PRESET STORAGE The TVM-821D allows the storage and retrieval of four complete sets AUDIO SELECTION of front panel configurations. This includes all of the buttons but does The AUDIO button is used the activate the audio lissajous trace.
  • Page 13 EAV and SAV are disabled then in RGB mode. AUDIO PHASE MARKINGS AUDIO TARGET BOXES REPRESENTING 0.5 dB AND 1.0 dB AMPLITUDE ERRORS. VIDEOTEK 700mV 50˚ 40˚ REFERENCE FOR 75% 612.5mV COLOR BARS.
  • Page 14: Theory Of Operation

    This interpolation allows color space conversion of the video to be done digitally at a 4:4:4 rate in U17. The basic signal flow and control structure of the TVM-821D may be seen in the interconnection diagram on page 27. The circuitry shown...
  • Page 15 Theory of Operation (cont'd) Sheet 10 : U32 is used to latch the lower 8 bits of the address from Sheet 5 : The Cr component VCR is connected to a DC restorer the multiplexed CPU address/data port. The programmable device, comprised of U25 and U13.
  • Page 16 Theory of Operation (cont'd) set by the ratio of R38 to R39 for a gain of about -28. Sheet 2 also TVM-852 BOARD depicts the CRT socket. Sheet 1 : Vertical deflection amplifier. The vertical signal enters the Sheet 3 : Contains the intensity amplifier, the focus amplifier, the board on CN4 pin 6.
  • Page 17 Theory of Operation (cont'd) 0 to +5V focus signal shipped from the TVM-851 board and changed it to a 0 to -5V signal suitable to drive focus amplifier. U1 switches be- tween the focus voltage and ground, which is selected during blanking time.
  • Page 18: Block Diagram

    Block Diagram...
  • Page 19: Block Diagram For Tvm-850 Board

    Block Diagram for TVM-850 Board...
  • Page 20: Block Diagram For Tvm-851 Board

    Block Diagram for TVM-851 Board...
  • Page 21 NOTES...
  • Page 22: Performance Check

    Performance Check TEST EQUIPMENT NEEDED 5. Missing bits check Digital 601 Test Pattern Generator a. Change INPUT to A 2 Channel Audio Source b. Change input signal to oversized ramps. c. Using HMAG and VMAG as needed, verify that the ramp is smooth and contains no gaps or sudden unusual transitions.
  • Page 23 Performance Check (cont'd) MEMORY CHECK TABLE Memory 1 Memory 2 Memory 3 Memory 4 INPUT A&B DISPLAY SWEEP line line line field FORMAT YCbCr YCbCr YCbCr SAV/EAV FILTER lowpass bowtie VIEW overlay CHANNEL YCbCr YCbCr AUDIO HMAG VMAG VECT FMT...
  • Page 24: Calibration Procedure

    Calibration Procedure 15. Field rate. In 3 cells, select field sweep and 625 rate input signal. EQUIPMENT NEEDED Adjust field rate R213 on the TVM-851 for approximately 1 small Dual Channel 100 MHz Scope timing mark between channels. Verify 625 LED is on. 16.
  • Page 25: Troubleshooting Procedure

    Troubleshooting Procedure Unit appears to be dead (no LEDs on, graticule lights off, and no ii. Ensure that the looping input is properly terminated at CRT display). Ensure power switch on front of unit is in the “I” the end of the cable. position.
  • Page 26 Troubleshooting Procedure (cont'd) Audio levels too high or too low. The unit is factory set for a nominal audio input on the audio left and right of +4 dBm referenced to a 600 S load. Switch SW1 is label audio attenuator and may be set for a 0 dBm, +4 dBm, +8 dBm, or a +12 dBm reference.
  • Page 27: Interconnection Diagram

    Interconnection Diagram...
  • Page 28 NOTES...
  • Page 29 Addendum...

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