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Harris Platinum Series Technical Manual

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TECHNICAL MANUAL
Platinum Series®
Television Transmitters
988-2365-001
T.M. No. 888-2365-001
Printed: 1995
Rev. C: 8/24/2000
© 1994, 1995, 1997, 1998, 1999, 2000 Harris Corporation
All rights reserved

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  • Page 1 TECHNICAL MANUAL Platinum Series® Television Transmitters 988-2365-001 T.M. No. 888-2365-001 Printed: 1995 Rev. C: 8/24/2000 © 1994, 1995, 1997, 1998, 1999, 2000 Harris Corporation All rights reserved...
  • Page 2 FAX facility (217/222-7041) or a TELEX service (650/372-2976). Replaceable Parts Service Replacement parts are available 24 hours a day, seven days a week from the HARRIS Service Parts Department. Telephone 217/222-8200 to contact the service parts department or address correspondence to Service Parts Department, HARRIS CORPORATION, Broadcast Division, P.O.
  • Page 3 MANUAL REVISION HISTORY Platinum Series 888-2365-XXX Revision # Date ECN # Pages Affected 001-A 02-24-97 41684 Replaced Title Page and pages 2-5 to 2-10 Added MRH-1/MRH-2 001-A1 06-30-97 39922 Replaced Title Page, MRH-1/MRH-2 and pages 7-13 & 7-14 001-A2 12-16-97 42056 Replaced Title Page, MRH-1/MRH-2 and pages 7-15 &...
  • Page 5 C001 and is not the actual part number for C001. In the ten digit part numbers, if the last three numbers are 000, the item is a part that Harris has purchased and has not manufactured or modified.
  • Page 7 The installation, operation, maintenance and service of this equipment involves risks both to personnel and equipment, and must be performed only by qualified personnel exercising due care. HARRIS CORPORATION shall not be responsible for injury or damage resulting from improper procedures or from the use of improperly trained or inexperienced personnel performing such tasks.
  • Page 8 888-2365-001 02-24-97 WARNING: Disconnect primary power prior to servicing.
  • Page 9 FIRST-AID Personnel engaged in the installation, operation, maintenance or servicing of this equipment are urged to become familiar with first-aid theory and practices. The following information is not intended to be complete first-aid procedures, it is a brief and is only to be used as a reference. It is the duty of all personnel using the equipment to be prepared to give adequate Emergency First Aid and thereby prevent avoidable loss of life.

  • Page 10: Table Of Contents

    Table of Contents SECTION I SECTION III INTRODUCTION OPERATION, CONTROLS, AND INDICATORS Introduction ........1-1 Control Cabinet .
  • Page 11 RF Ground ....... . . C-2 RF Amplifier Modules, Platinum Series...
  • Page 12 This page left blank intentionally...

  • Page 13: Section I

    Introduction 1.2.2 See Figure 1-5. The control system for the transmitter consists This section contains a general description of Platinum Series of a main controller mounted in the control cabinet, plus individ- television transmitters, their control systems, signal paths, and ual slave controllers mounted in each amplifier cabinet.
  • Page 14 Figure 1-1. Location of CB1 Figure 1-2. Location of I/O Panel & TB1 at Rear of Control Cabinet Inside Front Door on Control Cabinet Figure 1-4. Location of K1 Figure 1-3. Location of CB1 and CB2 at Rear of PA Cabinet(s) at Front of PA Cabinet(s) 888-2365-001 WARNING: Disconnect primary power prior to servicing.

  • Page 15: Volt Power Supplies

    Section I - Introduction Each slave controller controls a cabinet’s fan motor, 50 volt DC supplies, and RF amplifier modules. Slave controllers also report cabinet door interlock status, air interlock status, mod- ule faults, and power supply faults to the main controller. Cabinet input drive and RF power output samples, collected by RF peak detectors, are relayed to the main controller through the slave controllers as well.
  • Page 16 stages, and a sample of its output is routed to the exciter’s AGC those described above. A 3 dB quadrature hybrid then combines circuit to hold the exciter’s power output constant. the two cabinet outputs. • If optional dual exciters and an exciter switcher are used, both 15 kW (standard) exciters are fed a video signal, and each exciter’s visual output In a 15 kW system, the AGC module’s output feeds a driver...

  • Page 17: Aural Signal Path

    Section I - Introduction 1.2.10.3 AGC Module are recombined using four two-way combiners, before passing As in the visual path, the exciter switcher output or single exciter to the four 15 kW PA cabinets (see 15 kW system, above). feeds an AGC module, which holds the aural transmitter gain The visual cabinet outputs are recombined in pairs, using two 3 constant by controlling aural RF drive based on samples of dB quadrature hybrids.

  • Page 18: Transmitter Output Networks

    • The PA outputs pass to four-way power combiners, whose 30 kW Systems, 10% Aural (standard) outputs are combined in a 3 dB quadrature hybrid used as a In a high band system, the AGC module output first passes through two-way combiner.
  • Page 19 Section I - Introduction Table 1-1. Specifications 1. Visual Specifications Power Output: Availible in 1, 2, 5, 10, 15, 20, 30, 45, and 60 kW models, peak sync power. (Measured at output of optional diplexer.) RF Load Impedance: 50 Ohms Output Connector 1-10 kW: 8"...
  • Page 20 Table 1-1. Specifications (Continued) Equivalent Envelope Delay NTSC/M (referenced to FCC standard curve) 0.2 to 2.1 MHz: +40 nS +3.58 MHz: +30 nS +4.18 MHz: +60 nS B/PAL and B/SECAM: Complies with CCIR report 624, Figure 3, curve A or B. 2T Pulse K-Factor M/NTSC: 1.5% maximum...
  • Page 21 Section I - Introduction Table 1-1. Specifications (Continued) Distortion (THD) 50 Hz to 15 kHz: 0.25% or less. 15 kHz to 50 kHz: 0.75% or less. Distortion (IMD): 0.5% or less. SMPTE 4:1 test signal. Stereo Separation 50 Hz to 15 kHz: 45 dB or better. Equivalent mode (uncompanded). Crosstalk 50 dB or better.
  • Page 22 1-10 888-2365-001 WARNING: Disconnect primary power prior to servicing.

  • Page 23: Installation

    A system of overhead supports and hangers systems. To obtain a copy of this bulletin, contact Harris Field is needed to support the coaxial lines, filters, and other RF Service department.

  • Page 24: Circuit Breaker Selection

    If the contents are incomplete, or if the unit is Other input AC power requirements include the following: damaged electrically or mechanically, notify the Harris Cus- tomer Service Department by phone at 1-217-222-8200, or at the Starting Surge Requirement 2.2.7...

  • Page 25: Cabinet Placement And Leveling

    Section II - Installation A area large enough to store the boxes should be prepared in removes the hinge pins starting at the bottom and working up. advance to help the unloading process. Then, the door may be set aside and rollers (pipe) and a ramp used to remove the cabinet from the skid.

  • Page 26: Tap Transformers

    Use hardware as supplied with washers (1-split, 1-flat) to connect A cable tray (not furnished) should be installed along the top of (+) to left side of the 50 V bus bar, and (-) to the right side. the transmitter for cabinet interconnecting. Install the control and monitor cables in this tray.

  • Page 27: Failsafe Interlock: Tb1-3,4

    Three “D” connectors for remote control interface can be alternate exciter if not in a foldback or muted state. plugged directly into the Harris Sentinel remote control system ACIO Termination modules. These are: 2.11.4.2 J32: Status Outputs...
  • Page 28 LOCAL: Indicates the transmitter will not accept remote com- AURAL VSWR 1 - 2.0 VOLTS = 1.0 - 2.0 VSWR mand inputs. This line will be asserted low when the transmitter The above four selections follow the A/D edit function (part is in the LOCAL mode.

  • Page 29: Transmitter Check Out

    Section II - Installation Transmitter Check Out k. Set the time and date on the display. (Press SETUP, then 2.12 TIME. Refer to section three for additional information on date/time entry if needed. Press EXIT once when done.) CAUTION l. Press SETPOINT to access the setpoint screen. Enter the BEFORE PROCEEDING WITH CHECK OUT, INSPECT THE TRANS- station’s licensed power outputs to be used by the bar graph MITTER FOR AC POWER SHORTS, LOOSE HARDWARE, WIRING...

  • Page 30: Module Installation

    NOTE Make sure each module is completely seated. Unplugging J2 on the Slave Controller removes external inter- lock control of the PA cabinet. CAUTION c. Turn on the AC power to the cabinet. DO NOT USE EXCESSIVE FORCE OR SLAM MODULES INTO THE d.

  • Page 31: Vswr Foldback And Vswr Fault Check Out

    Section II - Installation VSWR Foldback And VSWR Fault Check Out 2.12.5 h. The VSWR should read approximately 1.11:1. If substan- tially different from this reading, perform procedure in This exercise involves using the exciter as a source for forward paragraphs 5.11.1 through 5.11.3.1 as required to adjust and reflected power samples in order to test for proper VSWR the reflected power calibration.

  • Page 32: Aural

    CAUTION n. Compare AGC reading on the display and voltages at the test points on front of the module to the factory test data. INIT PHASE MUST BE PROPERLY SET TO MINIMIZE REJECT o. Refer to AGC adjustments in Section V if needed. POWER UPON RETURN FROM A POWER FAILURE.

  • Page 33: Operation, Controls, And Indicators

    SECTION III OPERATION, CONTROLS, AND INDICATORS Control Cabinet LOCAL: Activation of the LOCAL switch disables the remote control system’s commands. Status and analog information will Cabinet Circuit Breaker 3.1.1 continue to be made available. The yellow lamp will be illumi- nated if LOCAL mode is activated.

  • Page 34: User Display Panel

    Figure 3-2. Monitor Screen Flow used most often for the remote control system failsafe interlock, AURAL DRIVE CHAIN FAULT (optional): Indicates an aural diplexer air switch, etc. driver has failed in the parallel aural driver chain. VSWR FOLDBACK ACTIVE: Indicates elevated VSWR has EXTERNAL INTERLOCK: When open, the External Interlock will prevent the transmitter from turning on.
  • Page 35 Section III - Operation, Controls, and Indicators 3.1.4.1 General Description: The user display panel allows the informa- tion to be displayed in both graphic and digital form. The information is displayed in a series of “screens.” The screens are arranged in a “tree” struc- ture: starting with the bargraph display screen (default), each screen contains a menu, and the subsequent screens contain...

  • Page 36: Detailed Screen Descriptions

    • Information about the visual system, such as percent power, Alarms Full Description - This screen is displayed by using forward and reflected power, VSWR, etc., is displayed. the DESC key from the Systems Alarms screen. This screen • displays more fully detailed descriptions of each alarm. Visual Information (2) (if required) - This screen is dis- played when the NEXT key is selected on the Visual Infor- mation (1) screen.
  • Page 37 Section III - Operation, Controls, and Indicators Date Time Visual Power 100 % Visual VSWR 1.10:1 Aural Power 100 % Aural VSWR 1.10:1 ALARM METER SETUP DATA Figure 3-4. Bargraph Meter Screen Bargraph Meter Screen The METER key will take the user to the multi-meter informa- tion in the system.
  • Page 38 Figure 3-5. Visual Information Screen Visual Info 1 - This is the 1st of 2 Visual information screens. AURAL - This key displays the aural information in the system. This screen is displayed when the METER key is Selected on the SUPPLY - This key will display the Power Supply information Bargraph Meter screen.
  • Page 39 Section III - Operation, Controls, and Indicators POWER SUPPLY INFORMATION ALARM Supply 1 Supply 2 AURAL A 50.3 V 157 A 50.3 V 131 A 50.2 V 237 A 50.0 V 226 A 50.5 V 234 A 50.1 V 217 A NEXT VISUAL AURAL...
  • Page 40 ALARM LINE VOLTAGE INFORMATION Line Voltages: Phase B-C Phase A-C Phase A-B 208 V 208 V 208 V VISUAL AURAL SUPPLY EXIT Figure 3-9. Line Voltage Information Screen Line Voltage Information screen - This screen is displayed SUPPLY - This key will display the Power Supply information when the LINE key is selected while viewing either power supply of the transmitter system.
  • Page 41 Section III - Operation, Controls, and Indicators TIME AND DATE ENTRY ALARM Current: Date Time 9-MAR-1989 05:03:00 New: Date Time 9-MAR-1989 05:03:00 TIME EXIT Figure 3-11. Time and Date Entry Time & Date Entry - This screen is displayed when the TIME - This key increments the value in the selected field by 1.
  • Page 42 USER DISPLAY EDIT ALARM (2) Visual Reflected Power 1 Visual Power - Visual VSWR 3 Aural Power 4 Aural VSWR >2 Visual Reflected Power - Aural Reflected Power - Visual Driver A Power - Aural Chain A Power DOWN SWAP NEXT EXIT Figure 3-13.
  • Page 43 Section III - Operation, Controls, and Indicators DISPLAY TEST Press TEST to Begin the Display Test Press Any Key to END the Test TEST EXIT Figure 3-15. Display Test Display Test or Sentry Setup - This screen is displayed when TEST - This key will cause every pixel on the screen to be turned the SCREEN TEST key is selected on the USER SETUP SELEC- on.
  • Page 44 SYSTEM ALARMS 27-OCT 12:00 I >024 VPA A Slave Fault 025 VPA B Slave Fault 27-OCT 12:00 I 027 Visual VSWR Overld 27-OCT 12:00 I 037 Visual VSWR Overld 27-OCT 12:00 I 038 Visual VSWR Overld 27-0CT 12:00 I 039 Aural VSWR Overld 27-0CT 12:00 I 040 VPA A Slave Fault 27-0CT 12:00 A...

  • Page 45: Exciter Switcher (Optional)

    Section III - Operation, Controls, and Indicators Exciter Switcher (Optional) 3.1.6 Figure 3-19. Optional Exciter Switcher Table 3-1. Optional Exciter Switcher SELECT: Selects exciter ‘A’ or ‘B’ via the optional exciter switcher. MODE MANUAL/AUTO: Selects the mode of operation for the exciter switcher. When in Manual exciter selection must be done manually.

  • Page 46: Agc Module

    AGC Module VERIFICATION OF AGC OPERA- TION 1. Reduce transmitter power to 50%. 2, Set AGC MODE switch to OFF. 3. Raise transmitter power back to 100%. 4. Set AGC MODE switch to ON. 5. Verify AGC action reduces transmitter power.

  • Page 47: Phase And Gain Module

    Section III - Operation, Controls, and Indicators Phase and Gain Module Figure 3-21. Phase and Gain Module Table 3-3. Phase and Gain Module Set-Up 1. Place RUN/SET switch in SET position. 2. Adjust INIT control (COARSE PHASE) for minimum reject load power. 3.
  • Page 48 Figure 3-22. HX 1V Exciter Front Panel Table 3-4. HX 1V Exciter Controls and Indicators ITEM FUNCTION DRIVE POWER MW Displays exciter drive power in milliwatts. POWER BAR GRAPH Displays power 0-1 watt. Visual power ref. peak sync. Aural power C.W. METER SELECT Selects Visual or Aural output for display on DRIVE POWER digital display and power bar graph.

  • Page 49: Exciter Operation

    Section III - Operation, Controls, and Indicators 3.5.2.4 Air Loss Exciter Operation Fan is not running, or air pressure is below the threshold of the air pressure sensing switch. Controls and Indicators 3.4.1 Refer to Figure 3-23 for the location of controls and indicators 3.5.2.5 PS-1 Fault associated with day-to-day standard operation of the HX-1V The power supply controller for 50 volt supply PS-1 has sensed...

  • Page 50: Rf Pa Module Led Display

    Figure 3-24. 50 Volt Power Supply Control Board Controls and Indicators RF PA Module LED Display Once VSWR fault is removed, the RF overdrive code of two blinks 3.5.3 per cycle will appear until the overdrive fault is removed. 3.5.3.1 Green Bar LED 50 Volt Power Supplies 3.5.4 The left half of the green LED indicates that the module is...

  • Page 51: Power Raise/Lower

    Section III - Operation, Controls, and Indicators Power RAISE/LOWER 3.6.3 immediately begin running at the correct drive level when excit- ers are switched at a later time. The power RAISE and LOWER buttons on the main control panel duplicate the exciter RAISE and LOWER switches. Upon The exciter power controls are active even if AC power is re- depressing one of these switches on the main controller, the moved.
  • Page 52 3-20 888-2365-001 Rev. B: 1/11/1999 WARNING: Disconnect primary power prior to servicing.

  • Page 53: Theory Of Operation

    SECTION IV THEORY OF OPERATION Introduction Other types of hybrids, with different amplitude and phase relationships, also exist and are useful for non-symmetrical This section provides detailed, technical descriptions of the combining, subtracting one signal from another, etc. operation of various circuits in the transmitter. For a more general description of transmitter operation, refer to Section I.

  • Page 54: Agc Module

    4, the reject port. This is the basis for attenuator and phase-shifter to base of Q1, a Darlington transistor whose emitter drives a PIN operation. diode attenuator. An adjustable attenuator can be made from a 3 dB hybrid and R1 through R9 form fixed pi attenuators, used to bring the exciter two 50 ohm potentiometers ganged together.

  • Page 55: Preamp

    Section IV - Theory of Operation For example, if point A is at a logic “high,” current will flow output transition is ensured by establishing a 33% comparator through CR3, which will become an RF short circuit to ground. hysteresis window. The hybrid port at U3 pin 2 will then see C4 as an RF impedance Current buffering for the LED and PIN diodes is performed using to ground.

  • Page 56: Control Circuits

    connector or removed from the cabinet, the load resistors will It also contains the VSWR Foldback circuit, VSWR Overload absorb some power. fault logic, and RF peak detectors for sampling. These circuits work together to protect the transmitter in the event of elevated The amount absorbed is slightly higher when the modules are antenna system VSWR, in order to prevent danger to the trans- disconnected and removed than when they are merely shut off.
  • Page 57 Section IV - Theory of Operation The output of U3 is supplied to the monitor and other on-board memory detector, so that if foldback is active, a VSWR fault will logic. not be latched by O/L latch U24. Power Up Detector (sheet 1) 4.2.8.2.4 Fault Status Drivers (sheet 3) 4.2.8.2.6...
  • Page 58 4.2.8.3 Slave Controller L1 and C50 form a series resonant trap that prevents the second Slave controllers are mounted in the upper left hand slot each PA harmonic from causing errors in the level detected. (This trap is cabinet. They interface all the cabinet control and monitoring deleted in recently produced units.) Nominal input level is circuits to the main controller and monitoring system.
  • Page 59 Section IV - Theory of Operation and applied to the Q inputs of U7 are equal, the P=Q output pin would disable them for the length of the pulse. Pressing the transmitter ON button will cause a short pulse on the CAB ON of U7 will assert low lighting the slave Select LED and indicating line, causing U22 to fire and thus pulsing only the enable lines the monitor is accessing the cabinet data.

  • Page 60: Basler 50 Volt Dc Power Supply

    a PS OK signal to the controller, removing the PS faults and The other status port, U35, is a tri-state buffer. It does not latch turning off the fault indicators. All of these signals are supplied the data on the input pins. to the monitoring system as status points.
  • Page 61 Section IV - Theory of Operation The firing sequence of the six SCR bridge is diagramed below. 24V regulator is reset by first removing, then reapplying, the The shaded area is the allowable conduction angles for correct three phase AC input. phasing.
  • Page 62 4-10 888-2365-001 WARNING: Disconnect primary power prior to servicing.
  • Page 63 Section IV - Theory of Operation 888-2365-001 4-11 WARNING: Disconnect primary power prior to servicing.
  • Page 64 4-12 888-2365-001 WARNING: Disconnect primary power prior to servicing.
  • Page 65 Section IV - Theory of Operation 888-2365-001 4-13 WARNING: Disconnect primary power prior to servicing.
  • Page 66 4-14 888-2365-001 WARNING: Disconnect primary power prior to servicing.

  • Page 67: Maintenance

    Introduction d. Change the filters when the restriction is equal to 50% of pressure drop measured above. Use Harris part number Maintaining a Platinum Series transmitter consists of three 448-0921-000, American Air Filter #627130500, or phases: equivalent filter for replacement.
  • Page 68 Table 5-1. Sample Maintenance Log ITEM INTERVAL RECOMMENDED MAINTENANCE LOG SCHEDULED SERVICE MECHANICAL PRE-FILTER MANOMETER READINGS Weekly INSPECT PRE-FILTERS Weekly REPLACE PRE-FILTERS As Required EXHAUST STACK MANOMETER READINGS 6 months CABINET INPUT AIR MANOMETER READINGS Weekly INSPECT TX AIR FILTERS Weekly REPLACE TX AIR FILTERS As Required...

  • Page 69: Cleaning

    Section V - Maintenace Table 5-2. Line Voltages and Currents into the connector. Reposition the cloth to a dry area to remove the cleaner. Inspect the RF amplifier module fins for accumulated dirt that LINE VOLTAGES may have gone past the air filters. Remove using a brush and vacuum.

  • Page 70: Inspect Movs

    dress and abrasions. High-current wires may be physically jolted Inspect MOVs from their positions by current surges at turn-on. Periodically visually inspect all MOVs to ensure proper transient RF cables rarely give trouble, but should be checked for tight protection. Replace if any damage is suspected, especially after connection.

  • Page 71: Visual Peak-Sync To Average Power Conversion For

    Section V - Maintenace Carefully performed calorimetric power measurements are gen- If a test signal consisting of only blanking and sync (black erally considered more accurate than through-line wattmeter picture) is used, the following formulas apply: measurements. For M/NTSC systems: Higher accuracy is obtained if the flow gauge reading is close to full scale, but reduced flow is usually required to calibrate aural x 0.595...

  • Page 72: Directional Coupler Alignment

    For transmitter models which use one or more 10 kW or 15 kW j. Re-install the line section in the system and calibrate power cabinets, the individual PA cabinets are calibrated at their rated of the stage. peak of sync power levels, and the peak detectors are calibrated Peak Detector Bias 5.12.2 to 2.5 volts at this power level.

  • Page 73: Ht20, Ht30, Ht60 Transmitters

    Section V - Maintenace Table 5-4. Peak Detector Power Calibration FORWARD REFLECTED VISUAL PA R60 @TP3 R74 @TP4 (INDIVIDUAL CABINETS AS (VISUAL PA SLAVE CONTROLLER) (VISUAL PA SLAVE REQUIRED) CONTROLLER) VISUAL REJECT POWER R95 @ TP5 MAIN CONTROLLER) COMBINED VISUAL POWER R79 @TP1 R87 @TP3 (MAIN CONTROLLER)

  • Page 74: Aural Rf Power Calibration

    Table 5-5. Setup Jumper Functions This table lists the jumper settings for normal operation with a * before the jumper settings MAIN CONTROLLER J18-1 > 2 Enable visual foldback action. J18-2 > 3 Disable visual foldback action. J19-1 > 2 Enable aural foldback action. J19-2 >...

  • Page 75: 45 Kw Transmitters

    Section V - Maintenace 45 kW Transmitters 5.14.3 Reject Load Calibration 5.15 For the 45 kW transmitters with 10% aural, each RF chain is This section covers calibration of the reject load power peak calibrated at 2.25 kW, and the combined transmitter output will detectors for those transmitters with external reject loads.

  • Page 76: 60 Kw Transmitters

    45 kW Transmitters 5.15.3 For 45 kW transmitters with the 20% aural power option, the calibration process is the same as it was for the visual reject loads, 5.15.3.1 Visual Reject Loads except that different points are monitored and adjusted. The For 45 kW transmitters, each visual PA cabinet should be ener- power levels for 20% aural will be those indicated in table below.
  • Page 77 Section V - Maintenace Table 5-7. SS Monitor Switch Settings (Software versions VHFSS01-S or later) SCREEN BLANKER - Blanks the screen, when enabled, after 1 hour of inactivity on the function keys. Any key press after blanking redisplays last screen. Rev.

  • Page 78: Agc Setup

    The final reject load for the combined aural cabinets may be Lamp Test 5.18 calibrated by energizing aural PA cabinet “A” at 3 kW (or 6 kW for The Main Controller board has a press-to-test switch to turn on 20% aural power option) and adjust calibrate control R-103 on the all Fault Status Indicator lamps.

  • Page 79: Visual Foldback And Fault Adjustment

    Section V - Maintenace mended that the VSWR foldback threshold adjustments not be d. Set the level of the reflected signal (visual power) such that changed from the factory settings, 1.20:1 visual and 1.40:1 aural. the front panel display indicates a aural VSWR of 1.40:1. e.
  • Page 80 5-14 888-2365-001 Rev. B: 1/11/1999 WARNING: Disconnect primary power prior to servicing.

  • Page 81: Troubleshooting

    This section contains procedures for troubleshooting problems in a It may be desirable in some cases to perform maintenance on one visual PA while operating at reduced power using the remaining Platinum Series transmitter system. cabinet. The transmitter architecture is modular, consisting of several When no power is available to a cabinet slave controller, it may subsystems.

  • Page 82: Main Raw Data Screen Information

    Except in the case of exception number 4444, the Exception Voltage information should be recorded and returned to Harris. The 14.NEG 12 V: Logic Power Supply -12 Volt Output Moni- Exception display can then be cleared by depressing the CLEAR...

  • Page 83: Slave Raw Data Screen Information

    Section VI - Troubleshooting 4. EXC A FAULT: ON = Exciter A is in a Fault condition Slave Raw Data Screen Information 5. EXC B FAULT: ON = Exciter B is in a Fault condition The same information is reported for all active slave cabinets on 6.
  • Page 84 Table 6-1. MODF Hexadecimal Coding vs Slot Faults The MODF number shows which slots are reporting faults. Five digits allow complete coding of the 17 slots as follows: Module slots #1 to #4 are represented by the lowest digit (0 0 0 0 X) Modules slots #5 to #8 by the second lowest digit (0 0 0 X 0) Modules slots #9 to #12 by the third lowest digit (0 0 X 0 0) Modules slots #13 to #16 by the fourth lowest digit (0 X 0 0 0)

  • Page 85: Transmitter Parts List

    Section VII Transmitter Parts List 7-1. Replaceable Parts Service Refer to the Replaceable Parts Serv- ice clause on back side of manual title page. NOTE The # symbol used in the parts list means used with (e.g. #C001 = used with C001). Replaceable Parts List Index Table 7-1.
  • Page 86 Table 7-1. CONTROL CAB - 992 7078 001 HARRIS P/N DESCRIPTION QTY/UM REF. SYMBOLS/EXPLANATIONS 041 1310 030 ..GASKET, RUBBER ....12.60 FT 299 0012 000 .
  • Page 87 999 2597 001 ..WIRE/TUBING LIST ....1.0 EA Table 7-2. MASTER CONTROLLER ASSY - 992 8008 001 HARRIS P/N DESCRIPTION QTY/UM REF.
  • Page 88 992 8050 001 ..PWB, LOGO LAMP BD..... 2 Table 7-3. FAULT LAMP PC ASSY - 992 8027 001 HARRIS P/N DESCRIPTION QTY/UM REF.
  • Page 89 Section VII - Transmitter Parts List 382 0781 000 ..IC, 74HC74 ESD ......2 U005 U024 382 0854 000 .
  • Page 90 516 0813 000 ..NTWK, CAP .01UF 50V SIP ....6 C057 C058 C059 C061 C066 C067 (C060 USED ON SOME VERSIONS) 518 0057 000 .
  • Page 91 843 4999 118 ..PWB, DISCRETE CONT....1 Table 7-5. PROGRAMMED MONITOR BD - 992 8040 002 HARRIS P/N DESCRIPTION QTY/UM REF.
  • Page 92 382 0510 000 ..* IC, ILQ-74 OPTO ISOL ....2 U039 U097 382 0562 000 ..IC, 74LS125AN ......1 U002 382 0621 000 .
  • Page 93 Section VII - Transmitter Parts List 404 0805 000 ..SOCKET 64 PIN DIP .900 ....1 XU001 404 0806 000 .
  • Page 94 999 2565 001 ..HARDWARE LIST ......1 Table 7-7. PWB, LOGO LAMP BD. - 992 8050 001 HARRIS P/N DESCRIPTION QTY/UM REF.
  • Page 95 Section VII - Transmitter Parts List Table 7-9. *PWB, SS VHF AGC,LOW BAND - 992 8014 001 Harris PN Description QTY UM Reference Designators (Y) 000 0000 008 ..SELECT IN TEST COMPONENT..0.0 EA R004 R005 R006 R007 R008 R009 358 1214 000 .
  • Page 96 843 4999 055 ..PWB, AGC ......1.0 EA Table 7-10. AGC MODULE, HIGH BAND - 992 8012 002 HARRIS P/N DESCRIPTION QTY/UM REF.
  • Page 97 843 4999 055 ..PWB, AGC ......1.0 EA Table 7-12. EXCITER SWITCHER MODULE - 992 8013 001 HARRIS P/N DESCRIPTION QTY/UM REF.
  • Page 98 839 7900 043 ..SCHEM, EXCITER SW. LOGIC ..0.0 EA 843 4999 081 ..PWB, EXCITER SWITCHER ... 1.0 EA Table 7-14. MOV-AC PROTECTOR ASSY - 992 8553 001 HARRIS P/N DESCRIPTION QTY/UM REF.
  • Page 99 Section VII - Transmitter Parts List Table 7-17. AURAL PA CABINET - 992 7079 001 HARRIS P/N DESCRIPTION QTY/UM REF. SYMBOLS/EXPLANATIONS 041 1310 030 ..GASKET, RUBBER ....20.920 FT #REAR SEAL 055 0120 004 .
  • Page 100 917 2100 095 ..CABLE, VIS PA PWR ....1.0 EA W052 917 2100 096 ..CABLE, AURAL MODULE ... . . 1.0 EA W051 917 2100 120 .
  • Page 101 Section VII - Transmitter Parts List Table 7-18. SCR BLEEDER ASSY, VIS - 943 4999 114 HARRIS P/N DESCRIPTION QTY/UM REF. SYMBOLS/EXPLANATIONS 335 0252 000 ..WASHER, TEFLON ..... . . 1 354 0577 000 .
  • Page 102 Table 7-19. SLAVE CONTROLLER MODULE - 992 8010 001 HARRIS P/N DESCRIPTION QTY/UM REF. SYMBOLS/EXPLANATIONS 304 0089 000 ..NUT, HEX 6-32 ......2 #FL001 306 0014 000 .
  • Page 103 Section VII - Transmitter Parts List 382 0791 000 ..IC, 74HC138 ......1 U008 382 0840 000 .
  • Page 104 917 2100 495 ..VIS20A VIS CAB INTERLOCK ....1 U049 U051 U053 Table 7-22. PWA, LED BOARD - 992 8023 001 HARRIS P/N DESCRIPTION QTY/UM REF.
  • Page 105 Section VII - Transmitter Parts List Table 7-23. MOV-AC PROTECTOR ASSY - 992 8553 001 HARRIS P/N DESCRIPTION QTY/UM REF. SYMBOLS/EXPLANATIONS 560 0049 000 ..MOV 4500A 75J 275VAC ....12...
  • Page 106 404 0578 000 ..SOCKET RELAY, 4PDT ....1.0 EA 424 0004 000 ..GROMMET 5/8 MTG DIA ... . . 1.0 EA 424 0007 000 .
  • Page 107 999 2613 001 ..WIRE/TUBING LIST FOR ... . . 1.0 EA Table 7-26. PHASE AND GAIN MODULE LB - 992 8011 001 HARRIS P/N DESCRIPTION QTY/UM REF.
  • Page 108 CR041 CR042 384 0612 000 ..DIODE 1N3070 ......9 CR031 CR032 CR033 CR034 CR035 CR036 CR037 CR038 CR045 384 0662 000 .
  • Page 109 Section VII - Transmitter Parts List Table 7-28. PHASE & GAIN MODULE HB - 992 8011 002 HARRIS P/N DESCRIPTION QTY/UM REF. SYMBOLS/EXPLANATIONS 952 9200 007 ..PHASE & GAIN TRAY ASSY ....1 992 8020 002 .
  • Page 110 843 4999 064 ..PWB, PHASE/GAIN BD....1 Table 7-30. EXC SWITCHER RELAY PNL 1A6A1 - 992 8025 001 HARRIS P/N DESCRIPTION QTY/UM REF.
  • Page 111 815 5476 003 ..SCHEMATIC, RF DETECTOR ....0 Table 7-32. INNER COND ASSY - 916 7256 001 HARRIS P/N DESCRIPTION QTY/UM REF.
  • Page 112 406 0510 007 ..VIDEO CONNECTOR ..... 0 Table 7-36. PREAMP 40-225 MHZ 1W - 992 8087 001 HARRIS P/N DESCRIPTION QTY/UM REF.

  • Page 113: Pa Amplifier Module Parts List

    Section VIII PA Amplifier Module Parts List 8-1. Replaceable Parts Service See the Replaceable Parts Service clause on back side of manual title page. Replaceable Parts List Index Table 8-1. MODULE, RF, BASIC PA, LB1 ....992 8966 001 Table 8-2.
  • Page 114 Table 8-1. MODULE, RF, BASIC PA, LB1 - 992 8966 001 HARRIS P/N DESCRIPTION QTY/UM REF. SYMBOLS/EXPLANATIONS 007 4060 079 . BRZ, FGR STK 97-606-02 ..32 . * 0.313 OF 16" = 5" 2 PIECES 2.5" REQ FOR LOGIC COVER 054 0014 103 .
  • Page 115 992 9018 001 . RF PLUG ASSY ....1. . . J001 Table 8-2. MODULE, DRIVER BASIC LB1, - 992 8961 001 HARRIS P/N DESCRIPTION QTY/UM REF.
  • Page 116 302 0401 000 . SCR, 4-40 X 1/4 ....1 . . 1# ATTEN 306 0003 000 . NUT, HEX 4-40 ....9 . . 2# PASS FET 2# BUSS BAR 3# DC FEED CLAMPS 2# CLAMP PASS FETS 306 0004 000 .
  • Page 117 992 9018 001 . RF PLUG ASSY ....1. . . J001 Table 8-3. MOD, 1/4, BASIC, LB, - 992 8958 001 HARRIS P/N DESCRIPTION QTY/UM REF.
  • Page 118 RT001 #SCREWED TO SINK 992 8956 001 . PWA, 1/4 MOD LB RF, ..1 . . Table 8-4. PWA, 1/4 MOD LB RF, - 992 8956 001 HARRIS P/N DESCRIPTION QTY/UM REF.
  • Page 119 Section VIII - PA Module Parts List 843 4999 492 . PWB, DIVIDER 2-WAY ..1. . . Table 8-6. COMB, LB1, 2 X 2 WAY - 992 8558 102 HARRIS P/N DESCRIPTION QTY/UM REF.
  • Page 120 302 0106 000 . SCR, 6-32 X 3/8 ....5 . . 2# OUTPUT COUPLER 302 0108 000 . SCR, 6-32 X 1/2 ....10 . 2#I/O CONNECTOR 8# COVER 302 0364 000 .
  • Page 121 992 9018 001 . RF PLUG ASSY ....1. . . J001 Table 8-11. MODULE, DRIVER, BASIC LB2 - 992 8962 001 HARRIS P/N DESCRIPTION QTY/UM REF.
  • Page 122 314 0005 000 . WASHER, SPLIT-LOCK 6 ..44 . 314 0037 000 . WASHER, SPLIT-LOCK 4 SS ..4 . . 3# RF LOADS 1# ATTEN 336 1239 000 . SCREW 6-32 X 3/8 ... . . 12 . 5# 2 X 2 DIVIDER 5# 2 X 2 COMBINER 2# COUPLER 344 0009 000 .
  • Page 123 992 9018 001 . RF PLUG ASSY ....1. . . J001 Table 8-12. DIVIDER, LB2, 2-WAY, SSTV - 992 8557 104 HARRIS P/N DESCRIPTION QTY/UM REF.
  • Page 124 Table 8-16. MODULE, RF, BASIC PA HB, - 992 8968 001 HARRIS P/N DESCRIPTION QTY/UM REF. SYMBOLS/EXPLANATIONS 007 4060 079 . BRZ, FGR STK 97-606-02 ..32 . 0.313 OF 16" = 5" 5"* 2 PIECES 2.5" REQ FOR LOGIC COVER 054 0014 103 .
  • Page 125 992 9018 001 . RF PLUG ASSY ....1. . . J001 Table 8-17. MODULE, DRIVER, BASIC HB, - 992 8963 001 HARRIS P/N DESCRIPTION QTY/UM REF.
  • Page 126 306 0071 000 . NUT, HEX #6-32 UNDERSIZE ..16 . 16# QTR MOD MTG 306 0072 000 . NUT, HEX #4-40 UNDERSIZE ..3 . . 3# RF LOADS 310 0003 000 . WASHER, FLAT NO. 4 ..18 . 4 PASS FET 6 LOGIC, 2 REG.
  • Page 127 992 9018 001 . RF PLUG ASSY ....1. . . J001 Table 8-18. MOD, 1/4, BASIC, HB, - 992 8959 001 HARRIS P/N DESCRIPTION QTY/UM REF.
  • Page 128 RT001 #SCREWED TO SINK 992 8957 001 . PWA, 1/4 MOD, HB RF, ..1 . . Table 8-19. PWA, 1/4 MOD, HB RF, - 992 8957 001 HARRIS P/N DESCRIPTION QTY/UM REF.
  • Page 129 Section VIII - PA Module Parts List Table 8-22. COMB, HB, 2-WAY - 992 8559 007 HARRIS P/N DESCRIPTION QTY/UM REF. SYMBOLS/EXPLANATIONS 000 0000 010 . B/M NOTE: ....0. . .
  • Page 130 382 1212 000 . IC, DS3632 ESD ....2 . . U008 U009 382 1426 000 . IC, LM317LZ ESD ....1 . . U010 384 0802 000 .
  • Page 131 U002 917 2100 460 . PAL, FAULT COUNTER ..1. . . U003 Table 8-28. ATTENUATOR,UNBALANCED PIE - 917 2100 639 HARRIS P/N DESCRIPTION QTY/UM REF. SYMBOLS/EXPLANATIONS 548 0227 000 . RES, 130 OHM 1/2W 1% ..0. . .
  • Page 132 548 2280 000 . RES 866 OHM 1/2W 1% ..0 . . 817 2100 639 . ASSY INSTR, INPUT ... 0 . . Table 8-29. ATTENUATOR,SELECT IN TEST - 917 2100 612 HARRIS P/N DESCRIPTION QTY/UM REF.
  • Page 133 380 0737 006 . *FET ON4402H GAIN #6 ESD ..0. . . 380 0737 007 . * FET ON4402H GAIN #7 ESD ..0. . . Table 8-31. THERMISTER ASSEMBLY - 992 8608 001 HARRIS P/N DESCRIPTION QTY/UM REF.
  • Page 134 8-22 (888-2365/2377/2378/2400/2402/2450-xxx) 10-15-96 WARNING: Disconnect primary power prior to servicing.

  • Page 135: Rf Amplifier Modules, Platinum Series

    PA slots. Harris Repair Department while your unit is shipped to our The modules are “hot-pluggable,” meaning that they can be factory for repair.

  • Page 136: Driver Module, Low Band

    Figure A-1. Low Band Driver Module, Simplified Block Diagram Driver Module, Low Band A.2.1 On the input and output Driver RF Intraconnection assemblies are provided optional capacitors for response correction. On the (Refer to the Low Band Driver Amplifier Schematic 843-4999-638) input assembly, A5A4, are C1 and C15.
  • Page 137 Appendix A - RF Amplifier Modules Figure A-3. PA Module Block Diagram The RF signal then feeds the 2-way Divider assembly. On this power sample to the module’s protection, control and monitor divider assembly there is in the signal path a microstrip direc- (PCM) system.

  • Page 138: Pa Module

    PA Module A.2.3 representing temperature and ISO voltage to the module PCM system. (Refer to the RF PA Module Schematic 843-4999-637) For any given channel, class A and class AB amplifier blocks use PA modules consist of four parallel class AB amplifier blocks. the same quarter module circuit.

  • Page 139: High Band Quarter Module

    Appendix A - RF Amplifier Modules If any phase or amplitude difference exists between the signal in The +15 Volts for the FET bias voltage divider is furnished by a the upper and lower amplifier halves a voltage will develop step-down regulator in the Protection, Monitoring and Control across R15.

  • Page 140: Module Status Leds

    Module Status LEDs indicating normal drive in a PA module. If the sample goes above A.2.9 the reference set by R101, U6 pin 1 will go low, indicating an Each module uses two front panel LEDs to display its current overdrive fault.

  • Page 141: Tv Module Test Fixture (992-8556-002

    The first is to check for causes consistent with the blink code (such as checking the DC supply voltage if blink code 4 occurs). Figure A-4. Wiring Diagram PA Module Extender (Harris PN 992-8556-001) (Drawing 843 5285 162) 10-16-95 (888-2365-001) (888-2377-001) (888-2378-001)
  • Page 142 Often, this will give an indication of whether the problem lies High Output VSWR Fault (1 blink) — The cause for this fault within the system or the module. is often external to the module. First, check the system VSWR on the display panel, and check for a VSWR foldback or VSWR If this does not locate the problem, then the next step is to check overload condition on the transmitter.
  • Page 143 Appendix A - RF Amplifier Modules then enable the module with a transmitter ON command. If the adjustment pots. Record the current after turning each pot off and fault remains, the problem is likely to be with the module control look for one or more FETs whose bias current is zero or lower board.

  • Page 144: Isolating Other Failures

    supply pins and the wiring to its slot. If no problem is found in If open pass FETs are suspected check the voltage at collector the power supply or connections, then the problem could be on (case) of Q1 of the Module Control Board as the module is the control board, either in the control logic or the comparator enabled and disabled.

  • Page 145: Locating Failed Rf Fets

    Appendix A - RF Amplifier Modules If the exciter drive level seems normal, try the module in a load resistor should still be placed at the module output to prevent different cabinet slot that is known to have proper RF drive. If oscillation.

  • Page 146: Parts Replacement Procedures

    Parts Replacement Procedures strength. For all other joints, use SN 63, PB 37 for its low melting point. Soldering Precautions A.4.1 b. Always use electrical solder with a rosin flux. Never use Please read the following precautions before attempting any plumbing solder or acid fluxes, which can cause copper to repair activity: corrode.

  • Page 147: Quarter Module Replacement

    Each gain code has a part number assigned to it. These are shown Quarter Module Replacement A.4.2 in the following table: CAUTION Gain Code Harris Part Number 380-0737-003 DO NOT REPLACE ACTIVE QUARTER MODULES WITH PASSIVE BIAS QUARTER MODULES, THE PCMS ARE INCOMPATIBLE. 380-0737-004 380-0737-005...

  • Page 148: Testing And Replacing Isolation Resistors

    b. Use the following procedure for filling a syringe with f) Continuing to hold the blade at 45 degrees or less, thermal compound. and starting at one end of the FET, sweep slowly across the FET. Made sure the blade does not lift up. 1.

  • Page 149: Chip Cap Replacement

    Appendix A - RF Amplifier Modules When pass FETs are replaced, change Q1 and R72 on the Module Red LED will extinguish. On PA modules one half of green LED Control Board, and change the 5.6 ohm resistors and the zener will illuminate.
  • Page 150 A.5.2.4 Overdrive Check High band driver gain is measured at 150 Watts average black power. Perform this check only after verifying that the module gain Black picture (sync and blanking only) is the best approximation adjustment is correct. See paragraph on Gain Check located for this test.
  • Page 151 Appendix A - RF Amplifier Modules M/NTSC B/PAL U6-4 Voltage E10-E12 .95 Volts E2, E3 .35 Volts Using a test load with low VSWR, measure the DC voltage of the forward sample at the feed through to the logic printed wiring .45 Volts or at junction of R5 and C4 for reference.
  • Page 152 Table A-1. Summary of Module Specifications A-18 (888-2365-001) (888-2377-001) (888-2378-001) 10-16-95 WARNING: Disconnect primary power prior to servcing.
  • Page 153 Appendix A - RF Amplifier Modules Table A-2. Input Attenuators/Driver 10-16-95 (888-2365-001) (888-2377-001) (888-2378-001) A-19 WARNING: Disconnect primary power prior to servcing.
  • Page 154 Table A-3. 30 Watt Attenuators A-20 (888-2365-001) (888-2377-001) (888-2378-001) 10-16-95 WARNING: Disconnect primary power prior to servcing.

  • Page 155: Appendix B Air Conditioning Considerations

    Appendix B Air Conditioning Considerations Air Conditioning Heat Load Estimate Guide A common practice is to set the transmitter into a wall, cooling Table 2-1 contains a guide that may be useful in estimating the it with outside air while providing air conditioning for the front required air conditioning capacity.
  • Page 156 (888-2345-001) (888-2353-001) (888-2354-001) (888-2365-001) WARNING: Disconnect primary power prior to servicing.

  • Page 157: Appendix C Surge And Lightning Protection And Grounding Considera

    Appendix C Surge and Lightning Protection and Grounding Considerations Surge and Lightning Protection c. Earth ground d. RF ground A lightning storm can cause transients in excess of 2 kV to appear on power or field signal lines. The duration of these transients varies from a few hundred nanoseconds to a few microseconds.

  • Page 158: Dc Ground

    DC Ground C.2.3 inches (0.5 meters). The ground rods should be copper-clad steel, a minimum of eight feet (2.5 meters) in length and spaced apart DC grounds in the transmitter are connected to a ground bus, which in turn is routed to a common cabinet ground and then not more than twice the rod length.

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