jotron TA-7650C Maintenance And Repair Manual
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jotron TA-7650C Maintenance And Repair Manual

Maritime vhf transmitter
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Summary of Contents for jotron TA-7650C

  • Page 1   85894_M&R_TA7650C_A...
  • Page 2 EC Declaration of Conformity available at: www.jotron.com Abbreviations and definitions ALARM Message by which the unit signals the occurrence of an event. The alarm is indicated by an audible tone and/or a message (or icon) on the display. Audio and PTT Modem. The APM is designed for use in applications, which requires long distance control of radios through a 4 or 2 wire leased lines.
  • Page 3 Local Area Network I.ED Light Emitting Diode. Operators Remote Control. With the ORC it is possible to select frequencies, which are stored in the channel memory of the radio. To ease the operation, channel names can be used for each frequency. The ORC requires a separate line pair that is connected to the serial interface of the radio.
  • Page 4 Amendment Record AMENDMENT INCORP. DATE PAGE(S) VERSION REASON FOR CHANGE 21.05.10 New release 26.05.10 Inserted stock no 85894_M&R_TA7650C_A...
  • Page 5 The information in this book has been carefully checked and is believed to be accurate. However, no responsibility is assumed for inaccuracies. Jotron AS reserves the right to make changes without further notice to any products or modules described herein to improve reliability, function or design. Jotron AS does not assume any liability arising out of the application or use of the described product.

  • Page 6: Table Of Contents

    ........................1-1 NVIRONMENTAL CHECK ..........................1-1 LARM READING TX B ............................1-2 ITE MENU 1.3.1 BITE alarm condition ........................1-3 TECHNICAL DESCRIPTION TA-7650C ....................2-1 ............................. 2-1 NTRODUCTION ............................2-2 AIN MODULE 2.2.1 Main board ........................... 2-2 2.2.1.1 DSP ............................2-2 2.2.1.2...

  • Page 7: Maintenance And Troubleshooting

    1 MAINTENANCE AND TROUBLESHOOTING Environmental check Once a year: 1. Turn OFF the unit. 2. Disconnect all plugs. 3. Clean all metal surfaces using a humid rag to remove dirt and dust. 4. Clean the knobs and connectors. 5. Clean the loudspeaker cover. 6.

  • Page 8: Tx Bite Menu

    TX Bite menu To check the BITE alarm conditions, please see chapter 1.3.1 . PA Module:Forward power in 1/10 dBm (472 =47dBm) PA Module:Reflected power in 1/10 dBm (12 =1dBm) PA Module:Calculated SWR in 1/10 (15 =1:1) PA Module:Current consumption in milliAmps (mA) PA Module:Temperature in degrees Celcius (°C) PA Module:+28V DC voltage in milliVolts (mV) PA Module:+12V DC voltage in milliVolts (mV)

  • Page 9: Bite Alarm Condition

    1.3.1 BITE alarm condition Alarm criteria Condition: Module: Unit PARAMETER: PA_3V3 PA_5V 12.8 PA_12V PA_28V PA_CUR PA current drain Modulator MOD_6V MOD_LD_L01 Digital 3v3 3.3V Logic – alarm if unlocked Modulator PA_TEMP °C PA temperature Modulator MOD_LEVEL_L01 PA_5VN -6.2 -4.0 PA_SWR Calculated SWR Main...

  • Page 10: Technical Description Ta-7650C

    82458 MAIN MODULATOR FRONT BOARD MODULE BOARD BOARD BOARD 84556 MODULATOR BOARD The TA-7650C transmitter unit consists of five modules and five boards: • Main module • Main board • Front module • Front board • PA module • PA board •...

  • Page 11: Main Module

    Main module The main module consists of the main board and the modulator module. The modulator module is plugged into the main module. 2.2.1 Main board The main board consists of DSP section, Audio section, DAC/ADC interface, BITE interface, I/O interface, Ethernet controller and memory section. 2.2.1.1 DSP The heart of the board is a digital signal processor (DSP-IC42) running firmware for all interactions with it’s peripherals.

  • Page 12: Bite Interface

    2.2.1.5 BITE interface The BITE interface consists of a A/D converter (IC 8) with 12 analog channels, reading analog measurements from all modules. It communicates with the DSP on a SPI bus. 2.2.1.6 I/O interface The I/O expander (IC12) provides the board with sufficient digital I/O lines for external and internal interfaces.
  • Page 13 The signal then the first amplifier, Q6. Q6 is autobiased by the circuit consisting of Q3 and Q1. The gain in this stage is also adjustable by altering the bias of D1. This is part of the overall gain control in the PA. Then the signal is amplified further in the pre-driver, Q6.

  • Page 14: Regulator Board

    on-resistance MOSFET and acts as a switch when the input voltage goes below the wanted output voltage. IC6 supplies approx. 35V, (input voltage + 8.2V) to the main regulator circuit. The relay RL1 is the main powerswitch and also acts as a reverse polarity protection because of D4.

  • Page 15: Software Module

    SPI bus. Reference input is taken from the system clock located on the main board. Software module The Software module contains all necessary software to make the TA-7650C transmitter unit functional. PSU-7002 Power supply Unit The PSU converts an AC input voltage between 105VAC and 250VAC to a 28V regulated DC voltage to support the 7000 series transmitters.

  • Page 16: Diagrams

    3 DIAGRAMS TA-7650C transmitter unit Block diagram TA-7650C BD-84555 Circuit diagram, Main board part 1 E-84006-1 Circuit diagram, Main board part 2 E-84006-2 Circuit diagram, Main board part 3 E-84006-3 Circuit diagram, Main board part 4 E-84006-4 Circuit diagram, Main board part 5...

  • Page 17: Parts List

    4 PARTS LIST Bill Of Material (BOM) Transmitter Unit BOM-84555 Front module BOM-82419 Front board BOM-84001 PA module BOM-84554 PA board BOM-84553 Reg. Board BOM-82458 Main module BOM-84558 Main board BOM-84006 Modulator module BOM-84557 Modulator board BOM-84556 85894_M&R_TA7650C_A...

  • Page 18: Appendix

    5 APPENDIX PSU-7002 bill of materials The PSU-7002 consists of a traded power supply, PBNO0311, from Powerbox A/S. The PBNO0311 consists of LEP240F-36 from Cosel. 85894_M&R_TA7650C_A...
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  • Page 24: Psu-7002 Diagram 1 Of 2

    PSU-7002 diagram 1of 2 85894_M&R_TA7650C_A...
  • Page 25 5.2.1 PSU-7002 diagram 2of 2 85894_M&R_TA7650C_A...
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