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Leader LT 444 Instruction Manual

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LT 4440 / LT 444
CHANGEOVER
INSTRUCTION MANUAL

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  • Page 1 LT 4440 / LT 444 CHANGEOVER INSTRUCTION MANUAL...

  • Page 2: Table Of Contents

    TABLE OF CONTENTS 1. INTRODUCTION......................1 Scope of Warranty......................1 Operating Precautions .......................1 1.2.1 Line Voltage and Fuse ....................1 1.2.2 Maximum Allowable Input Voltage ................2 1.2.3 Shorting of and Applying External Signals to Output Connectors....... 2 1.2.4 Installation........................2 1.2.5 Mechanical Shock.......................2 1.2.6 Calibration........................3 1.2.7...
  • Page 3 4.4.2 High Level Setting.....................18 4.4.3 Example of Incorrect Level Setting ................18 USER Settings .........................19 4.5.1 USER Setting Example.....................19 Attenuator Function......................20 Powering Up........................20 Powering Down ........................20 Key Lock Function......................21 4.10 Output Signal Switching ....................21 4.11 Error Signal Release Operation ..................22 4.12 Auto Switching Function....................23 4.12.1...
  • Page 4 ■ Precautions on Contents Should you find the contents in this manual and any of its technical terms confusing, please feel free to contact your local Leader agent. ■ Symbols and Terms Following terms and symbols that indicate necessary warnings and cautions used in this manual and on the product are there for safe operation.
  • Page 5 Use only the power cord that came with the instrument. The use of other cords could cause a fire hazard. If the provided cord is damaged, stop using it and contact your local Leader agent. The use of a damaged cord can cause electric shock or fire. When unplugging the power cord, pull by the plug, not the cord.
  • Page 6 Turn off the power and remove the power cord plug from the outlet. Check that the fire has not spread, and contact your local Leader agent. ■ Warnings on Grounding The instrument has a ground terminal to prevent electric shock and to protect the instrument.
  • Page 7 Adhere to the warnings and precautions described above and use the instrument correctly and safely. In addition, individual precautions are given in the sections of the instruction manual. If you have any questions or comments regarding the contents of this instruction manual, please contact your local Leader agent.

  • Page 8: Introduction

    1 year after the date of purchase. Keep the receipt or invoice as it will serve as a warranty card. Even during the warranty period, Leader will charge a fee for repairs in the following cases. Repair of malfunction or damages resulting from fire, natural calamity, or improper voltage applied by the user.

  • Page 9: Maximum Allowable Input Voltage

    1. INTRODUCTION 1.2.2 Maximum Allowable Input Voltage The maximum allowable input voltage to the input connectors is shown in the table below. Do not apply excessive voltage to prevent damage to the instrument. Table 1-1 Maximum allowable input voltage Connector Maximum Allowable Input Voltage Input connector ±5V (DC + peak AC)

  • Page 10: Calibration

    This instrument is produced under the strictest quality controls at the factory, but accuracy may gradually deteriorate due to worn components. Therefore, periodic calibration should be performed. When service or calibration is required, contact your local Leader agent. 1.2.7 Routine Maintenance Remove the power cord plug from the socket when cleaning the instrument.

  • Page 11: Rack Mounting Precautions

    (The table below lists the recommended slide rails.) Leader will not be held responsible for accidents that occur when these rails are not used. Table 1-2 Recommended Slide Rails for the LT 4440/LT 444 (one rail on each side) Parts Number Maker Name...

  • Page 12: Specifications

    LED. The LT 4440 is a short version of the LT 444 with a depth of 400 mm. You can set up a backup system by combining the LT 4440 with the LT 443D or the LT 4400 Multiformat Video Generator.

  • Page 13: Specifications

    SLOW 4 minutes or more (240 to 320 s) 2.3.5 Input Signal Type Set the type of input signal applied to the LT 4440/LT 444 using the internal dipswitch. Signal Type HD-SDI (CH1 to CH6 only) SD-SDI (270 Mb/s) SD-SDI (143 Mb/s)

  • Page 14: Determination Criteria Of The Signal Level

    2. SPECIFICATIONS 2.3.6 Determination Criteria of the Signal Level Detection Level Detects an error when the amplitude of the input signal drops by 2 to 5 dB from the defined level and makes the switch. The detection level varies slightly depending on the type of signal specified using the internal dipswitch.

  • Page 15: Error Display

    Frequency 50/60 Hz Power Consumption 25 Wmax. Dimensions 426(W) × 44(H) × 400(D) mm (LT 4440) 426(W) × 44(H) × 560(D) mm (LT 444) (excluding protrusions) Weight 3.5 kg (LT 4440) 4.0 kg (LT 444) Accessories Rack supports ......... 2 Rack support attachment screws ..

  • Page 16: Panel And Dipswitch Description

    3. PANEL AND DIPSWITCH DESCRIPTION PANEL AND DIPSWITCH DESCRIPTION The front panel, rear panel, side panel, and dipswitch section of the LT 4440/LT 444 are indicated below. Figure 3-1 Front Panel Figure 3-2 Rear Panel Figure 3-3 Side Panel...
  • Page 17 3. PANEL AND DIPSWITCH DESCRIPTION Removing the four screws from this cover enables you to set the internal dipswitch. This figure shows the factory default settings. Figure 3-4 Dipswitch Section...

  • Page 18: Front Panel

    3. PANEL AND DIPSWITCH DESCRIPTION Front Panel Figure 3-1 shows the front panel of the LT 4440/LT 444. KEY LOCK Switch used to turn ON/OFF the key lock. This key is also disabled while the instrument is starting up at power up.

  • Page 19: Side Panel

    3. PANEL AND DIPSWITCH DESCRIPTION Side Panel Figure 3-3 shows the side panel of the LT 4440/LT 444. Serial Number Provide this number when contacting LEADER. Dipswitch Section Figure 3-4 shows the dipswitch section of the LT 4440/LT 444. 10 Dipswitch cover Removing the four screws from this cover enables you to set the internal dipswitch.

  • Page 20: Detailed Description Of The Front Panel

    3. PANEL AND DIPSWITCH DESCRIPTION Detailed Description of the Front Panel Table 3-1 Front panel functions Key Name LED Name Description KEY LOCK KEY LOCK ON/OFF switch. Illuminates when KEY LOCK is ON. Illuminates when KEY LOCK is OFF. FAULT Use this key to clear the PRIMARY or BACKUP LED under INDICATOR FAULT INDICATOR.

  • Page 21: Detailed Description Of The Dipswitch Section

    3. PANEL AND DIPSWITCH DESCRIPTION Detailed Description of the Dipswitch Section Table 3-2 Signal selection switch (CH1 to CH11) SW No. Selection Signal All OFF Disable (no error detection) SW1 : ON NTSC Black Burst SW2 : ON PAL Black Burst SW3 : ON SD-SDI (143 Mb/s) SW4 : ON...
  • Page 22 3. PANEL AND DIPSWITCH DESCRIPTION Table 3-4 Error detection high level selection switch (VREF HIGH) SW No. Error Detection Level Selection All OFF Disable (no error detection) SW1 : ON Select high level for NTSC Black Burst SW2 : ON Select high level for PAL Black Burst SW3 : ON Select high level for SD-SDI (143 Mb/s)

  • Page 23: Operating Procedure

    4. OPERATING PROCEDURE OPERATING PROCEDURE Signal Inputs and Outputs Input the primary signal Input the backup signal To the system signal input Figure 4-1 Signal Inputs and Outputs At the BNC terminal on the rear panel, apply the primary signal to the PRIMARY connector and the backup signal to the BACKUP connector.

  • Page 24: Setting The Error Detection Signal

    4. OPERATING PROCEDURE Setting the Error Detection Signal CH11 Figure 4-3 Error Detection Setting <Example> Refer to Table 3-4, “Signal selection switch (CH1 to CH11)” and set the dipswitch according to the type of input signal. When applying NTSC BLACK BURST to the CH11 input connector, set dipswitch SW1 for CH11 to ON.

  • Page 25: Setting The Error Detection Level

    4. OPERATING PROCEDURE Setting the Error Detection Level 4.4.1 Low Level Setting For normal error detection level, set dipswitch as shown in Figure 4-5, “Low level setting”, All VREF LOW switches are turned ON and all VREF HIGH switches are turned OFF. Figure 4-5 Low level setting 4.4.2 High Level Setting...

  • Page 26: User Settings

    4. OPERATING PROCEDURE USER Settings The LT 4440/LT 444 automatically selects the detection level of the signal according to the signal selection switch. However, if you are using a signal other than those that are available, you can set the detection level using the USER volume. Two USER volumes are available.

  • Page 27: Attenuator Function

    4. OPERATING PROCEDURE Attenuator Function SW8 of dipswitch CH7 to CH11 is the attenuator function. If the input signal is five times the specifications, you can turn SW8 ON to perform error check by passing the input signal through the attenuator. However, the output signal is output as-is with the input signal bypassing the attenuator.

  • Page 28: Key Lock Function

    4. OPERATING PROCEDURE Key Lock Function When key operation is enabled Figure 4-10 KEY LOCK Release You can operate the front panel keys by turning OFF KEY LOCK on the front panel. However, if no key operation is detected for approximately 1 minute, KEY LOCK automatically turns ON and disables key operation.

  • Page 29: Error Signal Release Operation

    4. OPERATING PROCEDURE 4.11 Error Signal Release Operation <Example 1> When a level error is detected on CH1 PRIMARY, the PRIMARY LED of FAULT INDICATOR blinks and the FAULT CHANNEL 1 LED illuminates. Figure 4-12 Error detection example 1 To release the error, apply a normal signal to CH1 PRIMARY and press the RESET key of the FAULT INDICATOR section.

  • Page 30: Auto Switching Function

    4. OPERATING PROCEDURE 4.12 Auto Switching Function When set to SWITCH FAULT, a switch is made to the other signal (PRIMARY/BACKUP) when a level error is detected in the signal being passed to OUTPUT. Use this setting in the normal case. If an error is detected and a switch is made from the PRIMARY to BACKUP and then the error of PRIMARY is corrected and an error occurs in the BACKUP signal, the...

  • Page 31: When Set To Normal And Auto Switching Disabled

    4. OPERATING PROCEDURE 4.12.2 When set to NORMAL and AUTO SWITCHING DISABLED Figure 4-18 NORMAL and AUTO SWITCHING DISABLED The output signal maintains the current setting regardless of the status of the input signal. If you switch the SYNC SOURCE switch, the output signal can be toggled when both the input signals are normal or erroneous.

  • Page 32: List Of Operating Status

    4. OPERATING PROCEDURE 4.13 LIST OF OPERATING STATUS Normally, use the shaded settings. Settings of other sections are available for manual operation and maintenance. They are not usually used. Table 4-3 List of operating status Settings Input Signal Status SYNC SOURCE : PRIMARY SYNC SOURCE : BACKUP MODE AUTO...

  • Page 33: Remote Control

    (BACKUP) FAULT INDICATOR Transmits a high signal when an error occurs in PRIMARY or BACKUP. Even when the error clears, the LT 4440/LT 444 retains the high signal until the error is reset. RESET Apply a low signal to reset errors.
  • Page 34 5. REMOTE CONTROL Table 5-2 Remote connector I/O specifications I/O Specifications Connection example Connect a switch to apply a low signal. Connect one side of the switch to the remote connector and the other side to ground. Connect an LED so that it will light when a high signal is transmitted.

  • Page 35: Applications

    6. APPLICATIONS APPLICATIONS A setup example is given for the case when CH1 is set to NTSC BB, CH2 is set to HD-SDI, CH3 is set to DIGITAL AUDIO, and all other channels are set to no input signal. Connection In this example, the signals are connected as shown in Figure 6-1.

  • Page 36: Dipswitch Setup Procedure

    6. APPLICATIONS Dipswitch Setup Procedure Remove the four screws from the dipswitch cover on the top of the instrument. Refer to Table 3-4, “Signal selection switch (CH1 to CH11)” and set the dipswitch so that CH1 is set to NTSC BB, CH2 is set to HD-SDI, CH3 is set to DIGITAL AUDIO, and all other channels are set to no input signal.

  • Page 37: Panel Setup

    6. APPLICATIONS Panel Setup The panel setup for the example is described below. Press the KEY LOCK key to illuminate the OFF LED. Press the SYNC SOURCE key to illuminate the PRIMARY LED. Press the AUTO SWITCHING key to illuminate the SWITCH FAULT LED. Check that the PRIMARY and BACKUP LEDs of FAULT INDICATOR are not illuminated.

  • Page 38: Factory Default Settings

    7. FACTORY DEFAULT SETTINGS FACTORY DEFAULT SETTINGS Below are the factory default settings of the dipswitch on the LT 4440/LT 444. Error detection on all channels is disabled. Set the dipswitch according to the type of signal used before starting operation.

  • Page 39: Preventing Power Cord Description

    8. PREVENTING POWER CORD DESCRIPTION PREVENTING POWER CORD DESCRIPTION To prevent power cord disconnection from the AC inlet, the Cover/Inlet stopper is supplied with the instrument. Refer to the procedure below. Connecting the Power Cord Insert the power cord connector into the AC inlet. Place the Cover/Inlet stopper on top of the connector as shown below.

  • Page 40: Disconnecting The Power Cord

    8. PREVENTING POWER CORD DESCRIPTION Disconnecting the Power Cord Press the levers on the Cover/Inlet stopper with your fingers to release the lock. Remove the Cover/Inlet stopper from the base. Disconnect the power cord connector from the AC inlet.

  • Page 41: Maintenance

    9. MAINTENANCE MAINTENANCE The LT 4440/LT 444 is designed to operate stably under normal handling. If you have questions regarding output calibration and service, contact your local Leader agent.
  • Page 42 Following information is for Chinese RoHS only 所含有毒有害物质信息 LT 444/4440 部件号码: 此标志适用于在中国销售的电子信息产品,依据2006年2月28日公布的 《电子信息产品污染控制管理办法》以及SJ/T11364-2006《电子信息产品污染 控制标识要求》，表示该产品在使用完结后可再利用。数字表示的是环境保护使 用期限，只要遵守与本产品有关的安全和使用上的注意事项，从制造日算起在数 字所表示的年限内，产品不会产生环境污染和对人体、财产的影响。 产品适当使用后报废的方法请遵从电子信息产品的回收、再利用相关法令。 详细请咨询各级政府主管部门。 产品中有毒有害物质或元素的名称及含量 部件名称 有毒有害物质或元素 Hazardous Substances in each Part Parts 铅 汞 镉 六价铬 多溴联苯 多溴二苯醚 (Pb) (Hg) (Cd) (Cr(Ⅵ)) (PBB) (PBDE) 实装基板...
  • Page 43 LEADER ELECTRONICS CORP. 2-6-33 Tsunashima-Higashi, Kohoku-ku, Yokohama 223-8505, Japan PHONE:81-45-541-2123 FAX:81-45-541-2823 http://www.leader.co.jp July 17, 2012 Ver.4...

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