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Broadcast Electronics AM-2.5E, User Manual

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4–1

SECTION IV

RF POWER MODULE DRAWINGS

4-1.

INTRODUCTION.

4-2.

This section provides assembly drawings, wiring diagrams, and schematic diagrams as

listed below for the Broadcast Electronics AM-2.5E/AM-5E transmitter RF power module.

FIGURE

TITLE

NUMBER

4-1

SCHEMATIC DIAGRAM, MODULATOR CIRCUIT BOARD

SB917-0302/-001

4-2

ASSEMBLY DIAGRAM, MODULATOR CIRCUIT BOARD

AD917-0302/-001

4-3

SCHEMATIC DIAGRAM, POWER AMPLIFIER CIRCUIT

SB917-0304

BOARD

4-4

ASSEMBLY DIAGRAM, POWER AMPLIFIER CIRCUIT

AD917-0304

BOARD

Summary of Contents for AM-2.5E

Page 1: ...kers may be affected The effect of prolonged exposure to low level RF radiation continues to be a subject of investigation and controver sy It is generally agreed that prolonged exposure of personnel...

Page 2: ...procedures presented in SECTION II of this manual 2 at a transmitter site with a lightning protection system described in TRANSMITTER SITE LIGHTNING PROTECTION SYSTEM CHECKOUT refer to SECTION II of t...

Page 3: ...f Section 73 44 of the Commission s Rules It is the broadcast station s respon sibility to ensure that the audio signal applied to a Broadcast Electronics E Series AM transmitter conforms to the audio...

Page 4: ...to prevent accidents In addition to high voltages and currents the AM transmitters contain multiple circuit grounds with high ac and dc potentials with respect to the cabinet which is at earth potenti...

Page 5: ...MATION 1 1 INTRODUCTION 1 1 1 3 EQUIPMENT DESCRIPTION 1 1 1 4 GENERAL 1 1 1 6 EXCITER CONTROL UNIT 1 1 1 12 OUTPUT NETWORK ASSEMBLY 1 4 1 13 RF POWER MODULE 1 4 1 15 POWER SUPPLY 1 4 1 16 COMBINER ASS...

Page 6: ...LINE AND ANTENNA CHECKOUT 2 26 2 113 ANTENNA VSWR 2 26 2 114 COAXIAL SWITCH CONTROLLER 2 26 2 115 ATU AND PHASOR CHECKOUT 2 28 2 116 INITIAL CHECKOUT 2 28 2 118 PRELIMINARY OPERATION AND ADJUSTMENT 2...

Page 7: ...XCITER CIRCUIT BOARD 4 1 4 13 CONTROLLER CIRCUIT BOARD 4 2 4 18 POWER SUPPLY 4 2 4 19 RF POWER MODULE 4 2 4 24 RF COMBINER 4 7 4 27 OUTPUT NETWORK 4 7 4 31 POWER SUPPLY 4 8 4 34 POWER SUPPLY CIRCUIT B...

Page 8: ...20 TRANSMITTER FREQUENCY RE PROGRAMMING 5 4 5 22 TROUBLESHOOTING 5 4 5 24 TRANSMITTER INDICATORS 5 5 5 25 RF POWER MODULE REMOVAL 5 8 5 26 TRANSMITTER TROUBLESHOOTING 5 8 PROCEDURES 5 27 TRANSMITTER C...

Page 9: ...ION SYSTEM 2 27 2 13 TEST EQUIPMENT CONNECTIONS POWER LEVEL 2 30 CALIBRATION 2 14 TEST EQUIPMENT CONNECTIONS SEPARATION 2 31 2 15 EQUALIZATION LISSAJOUS PATTERNS 2 33 3 1 AM 2 5E AM 5E CONTROLS AND IN...

Page 10: ...high efficiency switching power supply 4 Star combiner assembly Each star combiner allows the removal of RF power mod ules without the use of dummy modules or bypass switches 5 A built in output matc...

Page 11: ...1 2 FIGURE 1 1 AM 2 5E TRANSMITTER 597 1114 1 COPYRIGHT 1999 BROADCAST ELECTRONICS INC...

Page 12: ...1 3 COPYRIGHT 1999 BROADCAST ELECTRONICS INC 597 1114 2 FIGURE 1 2 AM 5E TRANSMITTER...

Page 13: ...UT NETWORK ASSEMBLY Matching of the transmitter impedance to the antenna is accomplished by the output network assembly The assembly is equipped with an LC T network to match the transmitter output to...

Page 14: ...40 AM 2 5E AM 5E recommended spare parts kit Includes selected meters switches fuses filters etc Does not include semi conductors 977 0041 AM 5E 100 semi conductor kit 907 0016 110 VMC 16 Voice Remote...

Page 15: ...t circuit protected HARMONIC AND SPURIOUS Meets or exceeds FCC DOC and CCIR require SUPPRESSION ments when preceded by external NRSC 1 com patible audio low pass filters CARRIER FREQUENCY 3ppm 0 to 50...

Page 16: ...ted power INTERMODULATION DISTORTION 1 2 or less at 1 1 ratio 1 7 or less at 4 1 ratio MONO 60 7000 Hz SMPTE standards with 85 modulation at rated power CCIF INTERMODULATION 1 0 or less at 1 1 ratio 4...

Page 17: ...kW into a 50 ohm resistive load at 220V ac 0 9 power factor AM 5E 6 7 kW no modulation of 5 kW carrier 10 kW 100 modulation of 5 kW carrier Measured at 5 kW into a 50 ohm resistive load at 220V ac 0 9...

Page 18: ...Ohm input Adjustable from the transmitter front panel for each of the five power levels REMOTE INTERFACE Built in interface for most control and monitoring systems TABLE 1 2 PHYSICAL AND ENVIRONMENTAL...

Page 19: ...level 0 to 3048 Meters 50 Hz Models 0 to 7 500 feet above sea level 0 to 2286 Meters NOTE For AM 2 5E All specifications measured at 2 5 kW into a 50 ohm resistive load using Broadcast Electronics AS...

Page 20: ...If the heated transmitter air is to be ducted from the room the duct system must not introduce any back pressure on the equipment Proper allowances for air flow will ensure that only a limited amount...

Page 21: ...2 20 Selected components of the AM 2 5E and AM 5E transmitters have been removed to pre vent damage during shipment The components removed from the transmitter are shipped in separate containers 2 21...

Page 22: ...597 1114 7 FIGURE 2 1 AM 2 5E TRANSMITTER INSTALLATION 2 3 2 4 COPYRIGHT 1999 BROADCAST ELECTRONICS INC...

Page 23: ...597 1114 8 FIGURE 2 2 AM 5E TRANSMITTER INSTALLATION 2 5 2 6 COPYRIGHT 1999 BROADCAST ELECTRONICS INC...

Page 24: ...O THE POWER SUP PLY CIRCUIT BOARD ENSURE THE CIRCUIT BOARD IS INSERTED INTO THE MOUNTING PINS AND THE CAPACITORS ON THE CIRCUIT SIDE OF THE BOARD ARE PLACED INTO THE PANEL CUTOUT PRIOR TO SLIDING THE...

Page 25: ...Four position switch S1 programs the PWM frequency Refer to the factory test data sheets to check the programming of the switch 2 32 Frequency Synthesizer Programming Programmable header J6 determine...

Page 26: ...597 1114 14 FIGURE 2 5 COMPONENT INSTALLATION 2 9 2 10 COPYRIGHT 1999 BROADCAST ELECTRONICS INC...

Page 27: ...2 11 597 1111 11 FIGURE 2 5 EXCITER CIRCUIT BOARD PROGRAMMING COPYRIGHT 1999 BROADCAST ELECTRONICS INC...

Page 28: ...y previous raise lower operations For example the transmit ter is operating at power level 4 with the power level raised 5 by the power level raise lower circuit When power level 5 switch indicator is...

Page 29: ...2 13 597 1111 6 FIGURE 2 6 STEREO CIRCUIT BOARD PROGRAMMING COPYRIGHT 1999 BROADCAST ELECTRONICS INC...

Page 30: ...2 14 597 1112 5 FIGURE 2 7 CONTROLLER CIRCUIT BOARD PROGRAMMING COPYRIGHT 1999 BROADCAST ELECTRONICS INC...

Page 31: ...smitter is shipped from the factory programmed for 5 0 volt dc full scale remote for ward power meter indications 2 51 High Forward Power Defeat Programmable header J11 controls the high forward power...

Page 32: ...o raise lower power from 10 to 15 of the selected output power level The controls are located at J1 15 and J1 16 A 5 to 15 volt dc signal is required to activate the desired function 2 64 Antenna Inte...

Page 33: ...2 17 COPYRIGHT 1999 BROADCAST ELECTRONICS INC 597 1114 3 FIGURE 2 8 REMOTE CONTROL AND AUDIO CONNECTIONS SHEET 1 OF 2...

Page 34: ...2 18 COPYRIGHT 1999 BROADCAST ELECTRONICS INC 597 1114 3A FIGURE 2 8 REMOTE CONTROL AND AUDIO CONNECTIONS SHEET 2 OF 2...

Page 35: ...ignal to indicate when 1 100 watts of reflected power is present at the transmitter output for AM 2 5E models or 2 200 watts of reflected power is present at the transmitter output for AM 5E models Th...

Page 36: ...t the minus signal line to the terminal 3 Connect the shield to ground at the audio source end 2 88 EXTERNAL STEREO RF INPUT The transmitter is equipped with an external stereo RF input on the transmi...

Page 37: ...2 21 FIGURE 2 9 AM 2 5E AM 5E RF OUTPUT CONNECTIONS 597 1114 22 COPYRIGHT 1999 BROADCAST ELECTRONICS INC...

Page 38: ...ground conductor is securely connected to the transmitter common ground system and the ac service ground wire is securely connected to the ac ground lug as shown WARNING WARNING ENSURE PRIMARY POWER I...

Page 39: ...2 23 FIGURE 2 10 AM 2 5E PRIMARY AC WIRING 597 1114 10 COPYRIGHT 1999 BROADCAST ELECTRONICS INC...

Page 40: ...2 24 FIGURE 2 11 AM 5E PRIMARY AC WIRING COPYRIGHT 1999 BROADCAST ELECTRONICS INC 597 1114 9...

Page 41: ...he preceding text 2 Operate the transmitter at peak modulation and check the ball gap for arcing activity WARNING WARNING DISCONNECT ALL TRANSMITTER PRIMARY POWER BEFORE PROCEEDING 3 Operate the trans...

Page 42: ...for installation on the transmitter ac input cable Install the core by routing 1 all ac line phase cables through the core or 2 all ac line phase cables and ground cable through the core Place the co...

Page 43: ...2 27 FIGURE 2 12 ANTENNA LIGHTNING PROTECTION SYSTEM 597 1111 36 COPYRIGHT 1999 BROADCAST ELECTRONICS INC...

Page 44: ...ower connections are secure G Ensure the station RF output transmission line system and antenna are in proper working condition H Ensure the antenna lightning protection system is in proper working co...

Page 45: ...itter rear door ac on off control switch to ON 2 131 Depress power level control 1 switch indicator to illuminate the switch indicator 2 132 Operate the FORWARD POWER meter switch to LOW or HIGH as re...

Page 46: ...sate for antenna system variances The pri mary objective in the adjustment of the transmitter is to configure the stereo circuitry to minimize distortion and maximize separation across the entire audi...

Page 47: ...ermine a power level 2 145 Depress the desired power level switch indicator to illuminate the switch indicator 2 146 Refer to SECTION III OPERATION and perform the following 1 Operate the stereo circu...

Page 48: ...Refer to Figure 2 6 and adjust the left channel cutoff and peak controls to obtain a maximum left channel separation lissajous pattern as shown in Figure 2 15 C If a maximum left channel lissajous pa...

Page 49: ...597 0095 19 FIGURE 2 15 EQUALIZATION LISSAJOUS PATTERNS 2 33 2 34 COPYRIGHT 1999 BROADCAST ELECTRONICS INC...

Page 50: ...Refer to SECTION III OPERATION and operate the stereo circuit board mode control switch to illuminate the stereo indicator 2 155 Disable one channel applied to the transmitter 2 156 If an audio proce...

Page 51: ...tch 2 FORWARD POWER Configures the FORWARD POWER meter 1 to Meter HIGH LOW OFF display forward power information on the HIGH Switch scale 2 to display forward power information on the LOW scale or 3 t...

Page 52: ...3 2 597 1114 13 FIGURE 3 1 AM 2 5E AM 5E CONTROLS AND INDICATORS COPYRIGHT 1999 BROADCAST ELECTRONICS INC...

Page 53: ...ation with the LOAD control to match the transmitter output impedance to the antenna 9 AC ON OFF Controls the application of ac power to the transmit Switch ter 10 Modulation Monitor Calibrates the mo...

Page 54: ...ed from the transmitter RED Display Indicates a power supply system fault 4 ANTENNA VSWR Displays the condition of the antenna system Indicator GREEN Display Indicates a normal antenna load YELLOW Dis...

Page 55: ...tes to indicate an associated power control switch has been selected 6 OFF Switch Indicator SWITCH Deenergizes the transmitter RF output power and configures the unit to off INDICATOR Illuminates to i...

Page 56: ...POLARITY audio for application to the EXCITER MONITOR Switch Indicator LED bar graph display INDICATOR Indicates the signal polarity selected for display on the exciter monitor The indicator will ill...

Page 57: ...597 1114 23 FIGURE 3 2 ECU CONTROLS AND INDICATORS 3 7 3 8 COPYRIGHT 1999 BROADCAST ELECTRONICS INC...

Page 58: ...he transmitter is configured for remote control operation 20 REMOTE Indicator Illuminates to indicate transmitter remote control operations are enabled 21 CONFLICT Indicator Illuminates to indicate an...

Page 59: ...r Mode Configures the exciter for stereo mono L R mono Control Switch left or mono right operation The switch is designed to configure the exciter to a different mode of opera tion each time the switc...

Page 60: ...F DRIVE Illuminates to indicate RF drive is present at Indicator power amplifier 2 4 PA 2 FAULT Illuminates to indicate a fault has occurred in Indicator power amplifier 2 5 MOD PWM DRIVE Illuminates...

Page 61: ...ES MUST BE REMOVED FROM THE TRANSMITTER CHASSIS TO PREVENT DAMAGE TO THE MODULES NOTE NOTE ENSURE THE TRANSMITTER IS COMPLETELY INSTALLED PRIOR TO PERFORMING THE FOLLOW ING PROCEDURES 3 6 TURN ON 3 7...

Page 62: ...3 To configure the FORWARD POWER meter to off operate FORWARD POWER meter switch to OFF 3 18 REFLECTED POWER The reflected power meter presents reflected power and ac input indications To operate the...

Page 63: ...E TRANSMITTER EN SURE THE TRANSMITTER PRIMARY POWER IS OPER ATED TO OFF BEFORE REMOVING THE STEREO CIR CUIT BOARD 1 Operate the transmitter primary power to off 2 Completely remove the stereo circuit...

Page 64: ...Operate the rear door ac on off switch to on 3 Depress the RESET switch 3 39 OVER CYCLE OFF 3 40 The transmitter controller is equipped with an on off cycle counter circuit The circuit is designed to...

Page 65: ...ization 2 indicator illuminates to indi cate when equalization circuit 2 is selected 3 57 RF POWER MODULE INDICATORS 3 58 The RF power module indicators are designed to present the operating status of...

Page 66: ...isplay circuit boards Power for the ECU is provided by a modular switching power supply unit 4 8 STEREO CIRCUIT BOARD The ECU stereo circuit board consists of C QUAM AM stereo circuitry C QUAM AM ster...

Page 67: ...if a module is removed for maintenance or 2 if a power module fault has occurred A power supply status circuit displays 1 if a power supply circuit board is removed for maintenance or 2 if a power sup...

Page 68: ...597 1114 5 FIGURE 4 1 AM 2 5E BLOCK DIAGRAM 4 3 4 4 COPYRIGHT 1999 BROADCAST ELECTRONICS INC...

Page 69: ...597 1114 4 FIGURE 4 2 AM 5E BLOCK DIAGRAM 4 5 4 6 COPYRIGHT 1999 BROADCAST ELECTRONICS INC...

Page 70: ...wer from each RF power module to produce the rated RF output power 4 26 In addition to combining the RF power from the RF power modules the combiner design allows one or more RF power modules to be re...

Page 71: ...circuit 3 fault detection circuit The switching power supply circuit operates directly from the ac power source No primary ac power transformer is included in the circuit An SCR controlled bridge rec...

Page 72: ...ONLY 4 45 On AM 5E models communication between the controller RF power modules and the power supply circuit boards is provided by an interface circuit board The circuit board 1 routes status informat...

Page 73: ...eral months Replace the battery approximately once a year to ensure proper transmitter operation during ac power failure conditions 4 57 TRANSMITTER FLUSHING FANS 4 58 Cooling air for the transmitter...

Page 74: ...597 1114 6 FIGURE 4 3 AM 2 5E AM 5E POWER SUPPLY SIMPLIFIED SCHEMATIC 4 11 4 12 COPYRIGHT 1999 BROADCAST ELECTRONICS INC...

Page 75: ...he power supply circuit board The fuses protects the power supply circuitry from overload conditions Metal Oxide Varistor MOV1 prevents damage to the switching power supply circuit from ac line voltag...

Page 76: ...ut of the transistor switching regulator circuit is applied to filter inductor L2 Protection of the transistors from switching transients during turn on off operation is provided by clamp diode D32 Cl...

Page 77: ...ce a monophonic or a C QUAM AM stereo signal at the programmed carrier frequency The signal appears at the primary of combiner transformer T4 The RF signal is transferred to the secondary of T4 and ro...

Page 78: ...requency synthesizer a phase modulator for IPM correction and an RF driver network 4 93 Left channel audio is applied to an RFI filter and a defeatable 10 Hz high pass filter The 10 Hz high pass filte...

Page 79: ...lization 1 2 circuitry Therefore only the left channel equalization 1 circuit will be discussed 4 99 Left channel audio from the exciter circuit board is applied to the left channel equalization 1 cir...

Page 80: ...4 18 FIGURE 4 4 AM 2 5E AM 5E RF CIRCUITRY SIMPLIFIED SCHEMATIC SHEET 1 OF 2 597 1113 18 COPYRIGHT 1999 BROADCAST ELECTRONICS INC...

Page 81: ...597 1113 18A FIGURE 4 4 AM 2 5E AM 5E RF CIRCUITRY SIMPLIFIED SCHEMATIC SHEET 2 OF 2 4 19 4 20 COPYRIGHT 1999 BROADCAST ELECTRONICS INC...

Page 82: ...the time slope of the drain to source voltage waveform must be nominally zero prior to the turn on of the transistor The Class E circuit results in 1 lower device dissipation resulting in reduced tran...

Page 83: ...on to the modulation monitor calibration circuit is provided by the lightning detection circuit board A sample from the RF output is obtained by a capacitor circuit and applied to a relay circuit on t...

Page 84: ...o multiplexer U39 U39 selects a reference voltage from the power control potentiometers on the controller circuit board The potentiometers are designed to establish a preset transmitter power level su...

Page 85: ...ler circuit board is applied to a correction circuit on the power supply circuit board The PWM signal is converted to a dc signal and combined with a dc feedback signal to generate a power control sig...

Page 86: ...potentials with respect to the cabinet which is at earth potential The potentials could cause serious injury or death if maintenance personnel simultaneously touch a circuit ground and the cabinet As...

Page 87: ...ing temperatures for the transmitter solid state components Check the filter approximately once a week The filter is designed to be removed during transmitter operation To remove the filter proceed as...

Page 88: ...5 3 WARNING DISCONNECT POWER PRIOR TO SERVICING 597 1114 15 FIGURE 5 1 REMOVING THE AIR FILTER COPYRIGHT 1999 BROADCAST ELECTRONICS INC...

Page 89: ...DISCONNECTED EN SURE ALL TRANSMITTER PRIMARY POWER IS DIS CONNECTED BEFORE ATTEMPTING MAINTENANCE ON ANY AREA WITHIN THE TRANSMITTER 5 19 Adjustment procedures for controls associated with the transmi...

Page 90: ...extender circuit board with power energized Therefore the transmitter indicators and meters must be used to isolate a problem to a specific area 5 24 TRANSMITTER INDICATORS The following text presents...

Page 91: ...or 2 due to a fault in the remote control unit CONFLICT Illuminates to indicate an incorrect power level is selected for operation into the antenna connected to the transmitter LIGHTNING In the AM 2...

Page 92: ...ARD Stereo Equalization 1 Illuminates to indicate stereo equalization circuit 1 is active Stereo Equalization 2 Illuminates to indicate stereo equalization circuit 2 is active EXCITER CIRCUIT BOARD Ex...

Page 93: ...AUTION WHEN AC POWER IS APPLIED TO THE TRANSMIT TER AND THE RF DRIVE AND PWM DRIVE INDICA TORS ON RF POWER MODULES IN A POWER BLOCK ARE EXTINGUISHED THE RF POWER MODULES MUST BE REMOVED FROM THE TRANS...

Page 94: ...eshoot the exciter circuit board for lock indicator extinguished 2 Remove the stereo circuit board and perform the following 1 depress the RESET switch and 2 initiate transmitter operation If the tran...

Page 95: ...tput network assembly for a short circuit condition 5 Check the lightning protection circuit board in the output network assembly for a short circuit condition INTERLOCK INDICATOR 1 Operate remote loc...

Page 96: ...Check the transmitter fans in each cabinet If the fans are not operating check optical coupled relay OCR K1 3 Ensure the transmitter exhaust area is clear of obstructions MISSING NORMAL FAULT 1 Check...

Page 97: ...NNEL MODULATION LEVEL exciter circuit board WITH LOW EXCITER MONITOR LEFT CHANNEL MODULATION LEVEL LOW DEMODULATOR RIGHT 1 Refer to the ECU section and troubleshoot the CHANNEL MODULATION LEVEL excite...

Page 98: ...ES WITH MODULATION board 5 28 COMPONENT REPLACEMENT PROCEDURE Component replacement on printed circuit boards requires extreme care to avoid damage to the circuit board traces The following text descr...

Page 99: ...th a cotton swab moistened with a suitable solvent Rubbing alcohol is highly diluted and is not effective 5 33 The board should be checked to ensure the flux has been removed and not just smeared Rosi...

Page 100: ...5 15 WARNING DISCONNECT POWER PRIOR TO SERVICING 597 1114 18 FIGURE 5 2 AM 2 5E COMPONENT LOCATOR SHEET 1 OF 3 COPYRIGHT 1999 BROADCAST ELECTRONICS INC...

Page 101: ...5 16 WARNING DISCONNECT POWER PRIOR TO SERVICING 597 1114 16 FIGURE 5 2 AM 2 5E COMPONENT LOCATOR SHEET 2 OF 3 COPYRIGHT 1999 BROADCAST ELECTRONICS INC...

Page 102: ...5 17 WARNING DISCONNECT POWER PRIOR TO SERVICING COPYRIGHT 1999 BROADCAST ELECTRONICS INC 597 1114 16A FIGURE 5 2 AM 2 5E COMPONENT LOCATOR SHEET 3 OF 3...

Page 103: ...5 18 WARNING DISCONNECT POWER PRIOR TO SERVICING 597 1114 19 FIGURE 5 3 AM 5E COMPONENT LOCATOR SHEET 1 OF 3 COPYRIGHT 1999 BROADCAST ELECTRONICS INC...

Page 104: ...5 19 WARNING DISCONNECT POWER PRIOR TO SERVICING 597 1114 24 FIGURE 5 3 AM 5E COMPONENT LOCATOR SHEET 2 OF 3 COPYRIGHT 1999 BROADCAST ELECTRONICS INC...

Page 105: ...5 20 WARNING DISCONNECT POWER PRIOR TO SERVICING COPYRIGHT 1999 BROADCAST ELECTRONICS INC 597 1114 17 FIGURE 5 3 AM 5E COMPONENT LOCATOR SHEET 3 OF 3...

Page 106: ...POWER PRIOR TO SERVICING ECU COMPONENT LOCATOR POWER BLOCK COMPONENT LOCATOR 597 1114 20 FIGURE 5 4 AM 2 5E AM 5E ECU POWER BLOCK OUTPUT NETWORK ASSEMBLY COMPONENT LOCATOR SHT 1 OF 2 COPYRIGHT 1999 BR...

Page 107: ...WER PRIOR TO SERVICING 597 1114 21 COPYRIGHT 1999 BROADCAST ELECTRONICS INC FIGURE 5 4 AM 2 5E AM 5E ECU POWER BLOCK OUTPUT NETWORK ASSEMBLY COMPONENT LOCATOR SHT 2 OF 2 AM 2 5E AM 5E OUTPUT NETWORK A...

Page 108: ...7 0321 002 6 7 6 14 Combiner Circuit Board Assembly AM 5E 917 0321 005 6 7 6 15 Accessory Parts Kit AM 2 5E 957 0069 6 8 6 16 Accessory Parts Kit AM 5E 957 0071 6 8 6 17 Frequency Dependant Kit AM 2 5...

Page 109: ...PAGE 6 34 Power Block Frequency Dependant Kit 921 1080 KHZ 957 1025 064 6 12 6 35 Power Block Frequency Dependant Kit 1081 1300 KHZ 957 1025 065 6 12 6 36 Power Block Frequency Dependant Kit 1301 1580...

Page 110: ...ance FORWARD POWER Meter Filter RFI 30 Amperes 339 0030 1 Fuseholder 60 Amperes 250V Reject Type 415 0019 1 Fuse Holder AGC 415 2012 2 Connector 7 16 DIN Panel Jack Solder 417 0716 1 Cable L5PDF BH L5...

Page 111: ...610 0009 1 Cable L5PDM L5PDR 11 8 LDF5 610 0010 1 AC Sample Circuit Board Assembly 917 0306 007 1 Temperature Sensor Circuit Board Assembly 917 0306 009 1 PFC Relay Board Circuit Board Assembly 917 0...

Page 112: ...EMBLY 917 0330 REF DES DESCRIPTION PART NO QTY J1 Socket 4 Pin 418 0255 1 J2 J3 Stud PEM KFH 832 5ET PCB Mount 426 8008 2 K1 K2 Relay SPST 30 Amperes 270 1213 2 R1 Resistor 100k Ohm 2W 5 130 1062 1 Bl...

Page 113: ...10W W W 130 2032 1 U1 Integrated Circuit 4N33 Optical Isolator NPN Photo 229 0033 1 Transistor Infared Emitting Diode Type 1500V Isolation Response 30 kHz Maximum Current 50 mA Maximum 6 Pin DIP XU1 S...

Page 114: ...u E8 E11 thru E16 E22 E23 J3 Connector Male 24 Pin 417 2401 1 J1A thru J1F Socket Card Edge AMP 531353 6 417 0300 6 J2A thru J2F Connector 15 Pin SUB D Female 417 0375 6 T1 T2 Transformer P A Drive AM...

Page 115: ...ry 9 Volt Alkaline 350 0002 1 Ferrite Core Large AM Transmitter 375 0007 001 2 Core 1 102 OD X 63 ID X 512 THK 375 0009 2 Adjustment Tool Extended and Recessed Flat Blades 407 0186 1 Kit Instruction M...

Page 116: ...ES DESCRIPTION PART NO QTY Kit Frequency Dependent Parts Power Amplifier Modulator Circuit 957 1015 003 1 Board 771 920 KHZ Kit Frequency Dependent Parts Power Block 771 920 KHZ 957 1025 063 1 Kit Fre...

Page 117: ...7 0015 151 REF DES DESCRIPTION PART NO QTY Kit Frequency Dependent Parts Power Amplifier Modulator Circuit 957 1015 001 1 Board 522 650 KHZ Kit Frequency Dependent Parts Power Block 522 650 KHZ 957 10...

Page 118: ...81 1300 KHZ 957 1035 155 1 TABLE 6 29 FREQUENCY DEPENDANT KIT AM 5E 1301 1580 KHZ 957 0015 156 REF DES DESCRIPTION PART NO QTY Kit Frequency Dependent Parts Power Amplifier Modulator Circuit 957 1015...

Page 119: ...T NO QTY L5 thru Coil 921 1080 kHz 360 0114 XXX 4 L8 TABLE 6 35 POWER BLOCK FREQUENCY DEPENDANT KIT 1081 1300 KHZ 957 1025 065 REF DES DESCRIPTION PART NO QTY L5 thru Coil 1081 1300 kHz 360 0114 XXX 4...

Page 120: ...DIAGRAM POWER BLOCK MOTHERBOARD SB917 0303 7 6 ASSEMBLY DIAGRAM POWER BLOCK MOTHERBOARD AC917 0303 7 7 ASSEMBLY DIAGRAM COMBINER AC917 0321 001 006 7 8 SCHEMATIC DIAGRAM OPTICALLY COUPLED RELAY SB919...

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Page 138: ...ion Circuit 1 6 1 38 Fault Detection 1 7 1 43 Crowbar Circuit 1 7 1 47 Power Supply Circuit Grounds 1 8 SECTION II POWER SUPPLY CIRCUIT BOARD MAINTENANCE 2 1 Introduction 2 1 2 3 Safety Considerations...

Page 139: ...ower transformer T1 is applied to bridge rectifier D11 D11 rectifies the ac potential into an unregulated 30V dc supply for application to the RF pow er module power amplifier circuit boards Capacitor...

Page 140: ...age potentials If the ac line voltage is above approximately 270 volts transistor Q28 will be biased on With Q28 on the input to U6A will be muted When the input is muted 1 the transmitter output powe...

Page 141: ...597 1112 28A FIGURE 1 1 POWER SUPPLY CIRCUIT BOARD SIMPLIFIED SCHEMATIC 1 3 1 4 COPYRIGHT 1999 BROADCAST ELECTRONICS INC...

Page 142: ...l to opti cal coupler U8 With no mute signals present U8 will output a HIGH to AND gate U12A With a HIGH ac OK signal from U9 indicating the presence of ac power and no power supply faults U12A will o...

Page 143: ...from switching transients during turn on off operation is provided by clamp diode D32 Capacitor C55 provides filtering for the negative leg of the B supply The output of the regulator circuit B leg is...

Page 144: ...ault signal AND gate U12B will output a LOW to 1 disable regulator controller U13 2 disable the SCR controlled rectifier circuit and 3 initiate a logic se quence to enable the crowbar circuit refer to...

Page 145: ...rolled bridge rectifier circuit 2 soft start control circuit 3 ac line voltage detector circuit and 4 low voltage detection circuit The 0VP circuit ground is used to create the negative leg of the B s...

Page 146: ...smitters contain multiple circuit grounds with high ac and dc potentials with respect to the cabinet which is at earth potential The potentials could cause serious injury or death if maintenance perso...

Page 147: ...ER SUPPLY COMPONENTS 2 13 SAFETY CONSIDERATIONS The AM 2 5E AM 5E transmitters are equipped with extensive indicator and meter circuitry to allow the operator to isolate problems to a specific area wi...

Page 148: ...sing a digital voltmeter operate the voltmeter to diode check On Q21 place the negative lead on the drain center pin and the positive lead on the source 1 If the voltmeter indicates a non shorted cond...

Page 149: ...heck for a 120 Hz square wave pulse at the source of transistor Q55 on the controller circuit board A If a 120 Hz signal is present defective Q55 on the controller circuit board B If a 120 Hz signal i...

Page 150: ...ble entry in this section is indexed by reference designators appearing on the ap plicable schematic TABLE 3 1 REPLACEABLE PARTS LIST INDEX TABLE DESCRIPTION PART NO PAGE 3 2 Power Supply Panel Assemb...

Page 151: ...ythic Ceramic 0 1 uF 10 50V 003 1066 2 C9 Capacitor Electrolytic 10 uF 50V 023 1076 1 C10 Capacitor Monolythic Ceramic 0 01 uF 5 100V 003 1013 1 C11 Capacitor Ceramic 0 001 uF 10 200V 030 1033 1 C12 C...

Page 152: ...5 100V 003 1013 1 C65 C66 Capacitor Monolythic Ceramic 0 1 uF 10 50V 003 1066 2 C67 Capacitor Monolythic Ceramic 0 1 uF 10 50V 003 1066 1 C68 Capacitor Monolythic Ceramic 47 uF 10 50V 003 4743 1 C69...

Page 153: ...Silicon 75V 0 3 Amperes 203 4148 1 D25 Bridge Rectifier NAE 3060A 1 Ampere 200V 239 0001 1 D26 Diode Zener 1N4733A 5 1V 5 1W 200 4733 1 D27 Diode Zener 1N4746 18V 10 1W 200 4746 1 D28 Diode 1N4005 Si...

Page 154: ...Case 212 0310 1 Q26 Q27 Transistor 2N27000 FET N Channel TO 92 Case 210 7000 2 Q28 Transistor 2N3904 NPN Silicon TO 92 Case 211 3904 1 R1 Resistor 1 33 k Ohm 1 1 4W 103 1331 1 R2 Resistor 100 k Ohm 1...

Page 155: ...R57 Resistor 1 33 k Ohm 1 1 4W 103 1331 1 R58 Resistor 100 k Ohm 1 1 4W 103 1062 1 R59 Resistor 1 33 k Ohm 1 1 4W 103 1331 1 R60 R61 Resistor 100 k Ohm 1 1 4W 103 1062 2 R62 Resistor 10 k Ohm 1 1 4W 1...

Page 156: ...1 R111 thru Resistor 10 k Ohm 1 1 4W 100 1051 7 R117 R118 Resistor 39 2 k Ohm 1 1 4W 100 3951 1 R119 Resistor 10 k Ohm 1 1 4W 100 1051 1 R120 R121 Resistor 1 k Ohm 1 1 4W 100 1041 2 R122 Resistor 150...

Page 157: ...rcuit SG3525AN PWM Control 228 3525 1 U14 U15 Integrated Circuit 4N33 Optical Isolator NPN Photo 229 0033 2 Transistor Infared Emitting Diode Type 1500V Isolation Response 30 kHz Maximum Current 50 mA...

Page 158: ...k Ohm 5 2W 130 1062 1 R51 Resistor 36 Ohm 5 2W 130 3623 1 R129 Resistor 470k Ohm 5 1 2W 110 4763 1 Blank Power Supply Bulk Capacitor Circuit Board 517 0315 002 1 TABLE 3 5 POWER SUPPLY CAPACITOR CIRCU...

Page 159: ...atic diagrams as listed below for the Broadcast Electronics AM 2 5E AM 5E power supply circuit board FIGURE TITLE NUMBER 4 1 SCHEMATIC DIAGRAM POWER SUPPLY CIRCUIT BOARD SB917 0315 001 002 003 004 005...

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Page 165: ...ety Considerations 2 1 2 6 First Level Maintenance 2 1 2 8 Cleaning and Inspection 2 1 2 10 Second Level Maintenance 2 2 2 12 Troubleshooting 2 2 2 13 Safety Considerations 2 2 2 15 RF Power Module As...

Page 166: ...tages A 9 7 volt dc bias signal is incorporated into the PWM signal by resistor R10 and zener diodes D17 D18 1 7 Integrated circuits U2 and U13 are MOSFET driver stages The outputs switch to 1 a logic...

Page 167: ...dulator status circuit U5E will output a HIGH to disable power sup ply indicator DS3 1 14 Modulator Status Circuit The modulator status circuit consists of 1 NAND gates U6A U6B U6C and U6D 2 latches U...

Page 168: ...597 1112 26 FIGURE 1 1 MODULATION CIRCUIT BOARD SIMPLIFIED SCHEMATIC 1 3 1 4 COPYRIGHT 1999 BROADCAST ELECTRONICS INC...

Page 169: ...transistor drain to source volt age must be nominally zero immediately prior to the turn on of the transistor and 2 the time slope of the drain to source voltage waveform must be nominally zero prior...

Page 170: ...28 The fault detector functions by monitoring fuses F1 and F2 When fuse F2 is blown tran sistor Q11 will output 20 volts to silicon controlled rectifier SCR Q13 When fuse F1 is blown optical coupler U...

Page 171: ...597 1112 27 FIGURE 1 2 POWER AMPLIFIER CIRCUIT BOARD SIMPLIFIED SCHEMATIC 1 7 1 8 COPYRIGHT 1999 BROADCAST ELECTRONICS INC...

Page 172: ...n multiple circuit grounds with high ac and dc potentials with respect to the cabinet which is at earth potential The potentials could cause serious injury or death if maintenance personnel simultaneo...

Page 173: ...WITH RESPECT TO THE CABINET WHICH IS AT EARTH POTENTIAL DO NOT ENERGIZE THE TRANSMITTER WITH TEST EQUIPMENT CON NECTED TO THE TRANSMITTER OUTPUT NETWORK RF POWER MODULE RF COMBINER OR POWER SUPPLY COM...

Page 174: ...rd to the bracket C Repeat the procedure for the PA 2 and modulator circuit boards 6 Rotate the module and repeat the alignment procedure for the bottom circuit board bracket screws Secure the two Phi...

Page 175: ...Fluke 77 meter 45 2 Using the voltmeter as described in the preceding step measure the drain to gate and drain to source voltage of transistor Q1 on the defective power amplifier circuit board A If th...

Page 176: ...from an RF power module B Using a digital voltmeter operate the voltmeter to diode check and determine a reference voltage for the transistors on the circuit board as follows 1 Place the negative lea...

Page 177: ...FAULT OR FUSE INDICATOR 4 Replace all blown fuses on the circuit board ILLUMINATED CONT D 5 Re install the modulator circuit board and install the RF module in the transmitter If the modulator remain...

Page 178: ...embly 957 0010 001 3 2 3 3 Modulator Circuit Board Assembly 917 0302 3 2 3 4 Power Amplifier Circuit Board Assembly 917 0304 3 5 3 5 Power Module Frequency Dependant Kit 522 650 kHz 957 1015 001 3 8 3...

Page 179: ...c Ceramic 1 uF 10 100V 003 1041 1 C18 C19 Capacitor Electrolytic 10 uF 50V 023 1076 2 C20 Capacitor Monolythic Ceramic 1 uF 10 100V 003 1041 1 C21 Capacitor Ceramic 0 001 uF 10 200V 030 1033 1 C22 Cap...

Page 180: ...Silicon 75V 0 3 Amperes 203 4148 4 D24 D25 Diode Schottky 20V 1 Amp 1N5817 200 0019 2 DS1 Indicator LED Green 521 9175 3V 40 mA Maximum 323 9224 1 DS2 Indicator LED Red 521 9212 1 7V 50 mA Maximum 32...

Page 181: ...331 1 R38 Resistor 47 5 k Ohm 1 1 4W 103 4755 1 R39 Resistor 1 k Ohm 1 1 4W 100 1041 1 R40 Resistor 1 k Ohm 1 1 4W 100 1041 1 R41 Resistor 100 k Ohm 1 1 4W 103 1062 1 R42 Resistor 8 66 k Ohm 1 1 4W 10...

Page 182: ...Isolation Response 30 kHz Maximum Current 50 mA Maximum 6 Pin DIP U13 Driver TC4421CAT 2 Ampere 5 Pin TO 220 Case 220 4421 1 XF1 XF2 Fuse Clips AGC 415 2068 2 XU1 Socket 8 Pin DIP 417 0804 1 XU3 Socke...

Page 183: ...Diode 1N4148 Silicon 75V 0 3 Amperes 203 4148 6 D9 D10 Transzorb Diode 27 Volt 1 5KE27CA 206 0027 2 D11 Diode Zener 1N5229 4 3V 0 5W 201 0035 1 D16 Diode Transzorb Diode 300BV 1 5FE300CA 206 0300 1 D...

Page 184: ...051 2 R23 Resistor 10 Meg Ohm 5 1 4W 100 1083 1 R24 Resistor 1 96 k Ohm 1 1 4W 103 1964 1 R25 Resistor 680 Ohm 5 1 2W 110 6833 1 R26 Resistor 10 k Ohm 1 1 4W 100 1051 1 R27 R28 Resistor 332 Ohm 1 1 4W...

Page 185: ...k PA Capacitor Board Circuit Board 517 0318 001 2 Blank PA Inductor Board Circuit Board 517 0319 001 2 TABLE 3 7 POWER MODULE FREQUENCY DEPENDANT KIT 771 920 KHZ 957 1015 003 REF DES DESCRIPTION PART...

Page 186: ...REF DES DESCRIPTION PART NO QTY C48 C53 Capacitor Mica 910 pF 1 kV 042 9122 4 C49 thru C52 Capacitor Mica 1600 pF 1 kV 042 1622 8 L5 L6 L7 Inductor PA Drive 360 0113 XXX 6 Blank PA Capacitor Board Ci...

Page 187: ...ed below for the Broadcast Electronics AM 2 5E AM 5E transmitter RF power module FIGURE TITLE NUMBER 4 1 SCHEMATIC DIAGRAM MODULATOR CIRCUIT BOARD SB917 0302 001 4 2 ASSEMBLY DIAGRAM MODULATOR CIRCUIT...

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Page 192: ...nal Coupler Null Controls 2 2 2 15 Troubleshooting 2 2 2 16 Safety Considerations 2 2 2 17 Output Network Assembly Component Locations 2 2 2 18 Troubleshooting Procedures 2 3 2 19 Component Replacemen...

Page 193: ...assembly contains the 1 harmonic band pass filter 2 directional coupler circuit board 3 lightning protection circuit board 4 T matching network 5 lightning detection circuit board and 6 spark gap The...

Page 194: ...tain multiple circuit grounds with high ac and dc potentials with respect to the cabinet which is at earth potential The potentials could cause serious injury or death if maintenance personnel simulta...

Page 195: ...controls are required to be adjusted contact the Broadcast Electronics Customer Service Department for information and instructions to adjust the directional coupler null controls 2 15 TROUBLESHOOTING...

Page 196: ...BOARD TROUBLESHOOTING SYMPTOM CIRCUITRY TO CHECK HIGH REFLECTED POWER 1 Check diode D201 through D210 METER INDICATION WHEN ACTUAL REFLECTED POWER IS LOW TABLE 2 2 LIGHTNING DETECTION CIRCUIT BOARD S...

Page 197: ...ssembly 947 0211 3 5 3 9 Output Network Frequency Dependant Parts AM 2 5E 957 1035 121 3 6 522 650 KHZ 3 10 Output Network Frequency Dependant Parts AM 2 5E 957 1035 122 3 6 651 770 KHZ 3 11 Output Ne...

Page 198: ...ARTS LIST INDEX Sheet 2 of 2 TABLE DESCRIPTION PART NO PAGE 3 21 Output Network Frequency Dependant Parts AM 5E 957 1035 156 3 10 1301 1580 KHZ 3 22 Output Network Frequency Dependant Parts AM 5E 957...

Page 199: ...park Gap 2 1 kV 140 0024 1 Coil Variable 16 uH 20 Amperes AM Transmitter 360 0088 2 BNC Receptacle Bulkhead UG492A U 417 0017 1 Connector 7 16 DIN Panel Jack Solder 417 0716 2 Lightning Protection Cir...

Page 200: ...ener 1N4749 24V 10 5 Amperes 200 0024 2 D215 D216 Diode 1N4148 Silicon 75V 0 3 Amperes 203 4148 2 E202 thru Turret Double Shoulder 413 0025 7 E208 E209 thru Terminal Male Disconnect 410 0025 3 E211 E2...

Page 201: ...TABLE 3 7 LIGHTNING DETECTOR CIRCUIT BOARD ASSEMBLY 917 0306 004 REF DES DESCRIPTION PART NO QTY C401 thru Capacitor Mica 1000 pF 5 500V 042 3913 20 C420 E201 E202 Terminal Male Disconnect 410 0025 2...

Page 202: ...2 Capacitor Mica 2700 pF 8kV 15 Amperes 5 044 2723 292 1 C3 Capacitor Mica 4300 pF 8kV 18 Amperes 5 044 4323 292 1 C4 Capacitor Mica 6800 pF 4kV 18 Amperes 5 044 6823 291 1 C5 Capacitor Mica 3300 pF 8...

Page 203: ...Capacitor Mica 1600 pF 10kV 12 Amperes 5 044 1623 292 1 C3 Capacitor Mica 2700 pF 8kV 15 Amperes 5 044 2723 292 1 C4 Capacitor Mica 3900 pF 6kV 15 Amperes 5 044 3923 291 1 C5 Capacitor Mica 1800 pF 1...

Page 204: ...3B Capacitor Mica 2700 pF 8kV 15 Amperes 5 044 2723 292 2 C4 Capacitor Mica 8200 pF 4kV 20 Amperes 5 044 8223 291 1 C5A Capacitor Mica 2400 pF 6kV 13 Amperes 5 044 2423 291 1 C5B Capacitor Mica 1500 p...

Page 205: ...peres 5 044 1623 292 2 C2 Capacitor Mica 2000 pF 15kV 20 Amperes 5 044 2023 293 1 C3A C3B Capacitor Mica 1600 pF 10kV 12 Amperes 5 044 1623 292 2 C4 Capacitor Mica 4700 pF 6kV 16 Amperes 5 044 4723 29...

Page 206: ...All Frequency 360 1502 XXX 1 L3 Coil All Frequency 360 1503 XXX 1 L5 Coil All Frequency 360 1505 XXX 1 TABLE 3 22 OUTPUT NETWORK FREQUENCY DEPENDANT PARTS 1581 1700 KHZ AM 5E 957 1035 157 REF DES DESC...

Page 207: ...t network assembly FIGURE TITLE NUMBER 4 1 SCHEMATIC DIAGRAM OUTPUT NETWORK AM 2 5E SB957 0068 ASSEMBLY 4 2 SCHEMATIC DIAGRAM DIRECTIONAL COUPLER SB917 0306 002 CIRCUIT BOARD 4 3 SCHEMATIC DIAGRAM LIG...

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Page 212: ...er On 1 9 1 43 Power Control Circuit 1 10 1 46 Power Control Trim Circuit 1 11 1 50 Transmitter Off 1 11 1 51 AC Power Interruptions 1 12 1 55 Forward and Reflected Power Circuitry 1 12 1 57 Foldback...

Page 213: ...32 SECTION II TRANSMITTER ECU MAINTENANCE 2 1 Introduction 2 1 2 3 Safety Considerations 2 1 2 6 ECU Circuit Board Installation Removal 2 1 2 9 First Level Maintenance 2 2 2 11 Cleaning and Inspection...

Page 214: ...CTION IV ECU ASSEMBLY DRAWINGS 4 1 Introduction 4 1 LIST OF ILLUSTRATIONS FIGURE TITLE PAGE NO 1 1 CONTROLLER CIRCUIT BOARD 1 5 SIMPLIFIED SCHEMATIC 1 2 EXCITER CIRCUIT BOARD 1 21 SIMPLIFIED SCHEMATIC...

Page 215: ...ning 8 antenna interlock 9 foldback and 10 over temperature Control switches include power level 1 power level 2 power level 3 power level 4 power level 5 raise power and lower power switch indicators...

Page 216: ...ter display circuitry Resistor R38 and capacitor C21 establish the meter ballistics 1 13 METER CIRCUITRY The output of the half wave rectifier circuit is applied to a meter circuit consisting of 1 int...

Page 217: ...embly containing control and parameter monitoring display circuitry The control circuitry includes an antenna interlock circuit a power control network and a foldback control circuit The monitor displ...

Page 218: ...H will also bias driver transistor Q48 on to illuminate remote fail safe indicator DS2 When the remote control fail safe signal is removed a LOW is applied to U56 The output of U56 will go LOW The LOW...

Page 219: ...597 1112 29 FIGURE 1 1 CONTROLLER CIRCUIT BOARD SIMPLIFIED SCHEMATIC SHEET 1 OF 2 1 5 1 6 COPYRIGHT 1999 BROADCAST ELECTRONICS INC...

Page 220: ...597 1112 29B FIGURE 1 1 CONTROLLER CIRCUIT BOARD SIMPLIFIED SCHEMATIC SHEET 2 OF 2 1 7 1 8 COPYRIGHT 1999 BROADCAST ELECTRONICS INC...

Page 221: ...tions will output a LOW 0 volts when active The remote meter indications can be programmed for 5 volt or 2 5 volt full scale meter operations The circuitry may be interfaced to any type of remote cont...

Page 222: ...control unit fails or the external or exciter mute signal is activated U22B will output a LOW operate command The LOW operate command mutes 1 the exciter PWM signal and 2 the power supply circuit boa...

Page 223: ...ch indicator is depressed a HIGH is applied to U34 U35 The HIGH configures U34 U35 to count up U34 U35 will output binary numbers to digital to analog converter U43 U43 decodes the numbers from U34 U3...

Page 224: ...providing a one second delay to allow the circuitry to stabilize U54C responds by inverting the LOW to provide a HIGH reset pulse to counter U58 The HIGH disables counter U58 and prevents the counter...

Page 225: ...ircuit The foldback circuit will automatically reduce the transmitter RF output power to an acceptable operating level to prevent damage to the transmitter The controller monitors 1 the cabinet temper...

Page 226: ...y encoder U28 and 2 a HIGH to latch U67A The HIGH reflected power attack signal is used by U28 to initiate an attack sequence to reduce the transmitter output power The HIGH to U67A will configure U67...

Page 227: ...34 and Q35 on to enable the alarm indicator U51A ANDs a 2 Hz signal with the HIGH from U49A to generate a flashing signal to OR gate U50C U50C will output the signal through U51 and U50 to transistor...

Page 228: ...will go LOW The LOW is inverted at U54E U54E will output a HIGH 1 2 1 VSWR signal to OR gate U50C U50C will output a HIGH to AND gate U51B and NAND gate U52C With a LOW reflected power emergency sign...

Page 229: ...6 The 1 16 Hz clock signal from U27 is applied to up down counters U30 U31 U30 U31 will respond by counting up and routing binary numbers to digital to analog converter U42 U42 will respond by routing...

Page 230: ...H emergency off signal to OR gate U37A This configures U37A and OR gate U13A to generate a transmitter off signal 1 87 Power Supply Maintenance Condition During a power supply maintenance condition th...

Page 231: ...er circuit board is equipped with an over cycle circuit The circuit is designed to prevent damage to the crowbar resistors on the power supply circuit board during 7 transmitter on off cycles within 1...

Page 232: ...is applied to an instrumentation amplifier 1 102 Integrated circuits U1A U1B and U2A are configured as an instrumentation amplifier circuit The circuit is designed to provide balanced to unbalanced si...

Page 233: ...597 1112 24A FIGURE 1 2 EXCITER CIRCUIT BOARD SIMPLIFIED SCHEMATIC 1 21 1 22 COPYRIGHT 1999 BROADCAST ELECTRONICS INC...

Page 234: ...s D1 and D2 and negative limit control R76 The circuit is designed to prevent the loss of carrier during negative modulation Potentiometer R76 allows the circuit to be adjusted from 90 to 100 The outp...

Page 235: ...ctangular wave pulses to loop filter U26B and low pass filter U26A U26A and U26B function together to generate a stable dc control voltage for application to a voltage controlled oscillator VCO module...

Page 236: ...rcuit The RF detector consists of 1 resistors R151 through R155 2 capacitors C124 and C125 and 3 diode D27 The detector rectifies the signal for application to an automatic mono stereo select circuit...

Page 237: ...UIT The exciter circuitry is equipped with an exciter failure detector circuit The circuit consists of integrated circuits U22B U23A and U23B Two signals are routed to the detector circuit 1 the PWM c...

Page 238: ...597 1111 25 FIGURE 1 3 STEREO CIRCUIT BOARD SIMPLIFIED SCHEMATIC 1 27 1 28 COPYRIGHT 1999 BROADCAST ELECTRONICS INC...

Page 239: ...delay circuit is a third order low pass filter designed to provide 4 microseconds of delay to match low and mid frequency delay equalization requirements The output of the circuit is routed to 4 micr...

Page 240: ...erter U27B and 3 buffer U31B U27B generates a L R signal for application to a phase modulator circuit U31B is designed to buffer the L R signal for application to an L R metering circuit on the ECU di...

Page 241: ...ease the voltage to a 5 volt peak to peak level The output of T1 is buffered by inverters U40A and U40B Potentiometer R193 adjusts the symmetry of the signal to null the second harmonic frequency The...

Page 242: ...equalization circuit 2 for antenna C operations 1 157 The circuit selects equalization circuit 1 or 2 when a status signal is applied to U41A U41B For example a LOW is applied to U41B when antenna A i...

Page 243: ...operating configuration stored in the controller logic circuitry Once power is returned to the transmitter the transmitter will automatically resume operation in the configuration appearing prior to t...

Page 244: ...h ac and dc potentials with respect to the cabinet which is at earth potential The potentials could cause serious injury or death if maintenance personnel simultaneously touch a circuit ground and the...

Page 245: ...and the results recorded in a performance log 2 11 CLEANING AND INSPECTION WARNING WARNING NEVER OPEN THE EQUIPMENT UNLESS ALL TRANS MITTER PRIMARY POWER IS DISCONNECTED EN SURE ALL TRANSMITTER PRIMAR...

Page 246: ...MENT in SECTION II for the adjustment procedure 2 21 FWD AND RFL CALIBRATIONS FWD CAL control R56 and RFL CAL control R143 calibrate the transmitter forward and reflected power samples Due to the crit...

Page 247: ...ation and instructions to adjust the phase modulator calibration control 2 31 SYMMETRY CONTROL Symmetry calibration control R170 adjusts the exciter RF output square wave signal Due to the critical na...

Page 248: ...cate negative L R modulation 2 45 Adjust NEG LIMIT control R76 on the exciter circuit board until the AM stereo Modulation monitor indicates 95 L R modulation WARNING WARNING DISCONNECT ALL TRANSMITTE...

Page 249: ...odulation as indicated by the modulation monitor Adjust R L R calibration control R48 until the EXCITER MONITOR just indicates 100 L R modulation WARNING WARNING DISCONNECT ALL TRANSMITTER PRIMARY POW...

Page 250: ...If the square wave signal at U25 is not present check for a greater than 13 volt dc signal at the anode of D23 1 If the dc voltage is present defective VCO Q4 or U30A 2 If the dc voltage is not prese...

Page 251: ...R INDICATOR 1 Check the frequency synthesizer programming at S1 ILLUMINATED ON TRANSMITTER S2 and J6 MONITOR 2 Check for a square wave carrier frequency signal at U23 pin 12 A If the carrier frequency...

Page 252: ...DICATOR 1 Insert a 1 kHz audio signal at 10 dBm into the left ILLUMINATED ON channel and operate the stereo circuit board to stereo TRANSMITTER MONITOR Check for a 3 0V p p quadrature AM signal at TP...

Page 253: ...EVEL U11B or J2 B If the signal is not present defective U7A U8 U7B U9 or U10A TABLE 2 3 CONTROLLER CIRCUIT BOARD TROUBLESHOOTING Sheet 1 of 2 SYMPTOM CIRCUITRY TO CHECK NO POWER CONTROL PWM 1 Check f...

Page 254: ...oadcast Electronics Customer Service Department CONFLICT INDICATOR 1 Check U7 U8 U9 S1 S2 S3 U12A U12B ILLUMINATED U21A U21B U21C U20A U20B U20C U20D U19 and U13 TABLE 2 4 ECU POWER SUPPLY TROUBLESHOO...

Page 255: ...3 1 REPLACEABLE PARTS LIST INDEX TABLE DESCRIPTION PART NO PAGE 3 2 Exciter Controller Assembly 957 0009 100 3 2 3 3 ECU Controller Circuit Board Assembly 917 0205 3 2 3 4 ECU Extender Circuit Board...

Page 256: ...9 1 C39 thru Capacitor Monolythic Ceramic 0 1 uF 10 50V 003 1066 10 C48 C49 Capacitor Electrolytic 10 uF 35V Non Polarized 023 1075 1 C50 Capacitor Monolythic Ceramic 0 1 uF 10 50V 003 1066 1 C51 C52...

Page 257: ...Ceramic 0 1 uF 10 50V 003 1066 4 C114 C115 Capacitor Monolythic Ceramic 47 uF 10 50V 003 4743 1 C116 Capacitor Electrolytic 10 uF 35V Non Polarized 023 1075 1 C117 C118 Capacitor Monolythic Ceramic 0...

Page 258: ...e HP5082 2800 High Voltage Schottky Barrier Type 201 2800 1 70V 15 mA D44 thru Diode 1N4148 Silicon 75V 0 3 Amperes 203 4148 2 D45 D49 thru Diode 1N4148 Silicon 75V 0 3 Amperes 203 4148 3 D51 D53 thru...

Page 259: ...1 1 4W 103 1474 1 R23 Resistor 1 k Ohm 1 1 4W 100 1041 1 R24 Resistor 100 k Ohm 1 1 4W 103 1062 1 R25 Resistor 301 k Ohm 1 1 4W 103 3061 1 R26 thru Resistor 100 k Ohm 1 1 4W 103 1062 3 R28 R29 Resisto...

Page 260: ...1 1 4W 103 1062 2 R81 R82 Resistor 20 0 k Ohm 1 1 4W 103 2051 2 R83 Resistor 4 7 Meg Ohm 5 1 4W 100 4773 1 R84 Resistor 47 5 k Ohm 1 1 4W 103 4755 1 R85 Resistor 10 k Ohm 1 1 4W 100 1051 1 R86 Resist...

Page 261: ...or 90 9 k Ohm 1 1 4W 103 9095 3 R147 R148 thru Resistor 47 5 k Ohm 1 1 4W 103 4755 3 R150 R151 Resistor 90 9 k Ohm 1 1 4W 103 9095 1 R152 Resistor 10 k Ohm 1 1 4W 100 1051 1 R153 Resistor 499 Ohm 1 1...

Page 262: ...0 k Ohm 2 1W Resistors 8 Pin Single 226 1051 1 In Line Package RN6 RN7 Resistor Network 9 100 k Ohm 2 2 7W Resistors 10 Pin Single 226 1060 2 In Line Package RN8 Resistor Network 10 k Ohm 2 1W Resisto...

Page 263: ...ounter CMOS 228 4516 2 16 Pin DIP U36 Integrated Circuit CD4081B Quad 2 Input AND Gate CMOS 225 0008 1 14 Pin DIP U37 Integrated Circuit CD4075BE RCA 225 0006 1 U38 Integrated Circuit MC14073B Tripple...

Page 264: ...4 Pin DIP 221 0339 2 U67 Integrated Circuit MC14043BP CMOS Quad NOR Gate 16 Pin DIP 220 4043 1 U68 Integrated Circuit MC14538B Dual Retriggerable Resettable 228 4538 1 Monostable Multivibrator CMOS 16...

Page 265: ...cle 50 Pin Dual In line 417 0147 1 Blank ECU Extender Circuit Board AM 1 517 0208 1 TABLE 3 5 STEREO CIRCUIT BOARD ASSEMBLY 917 0209 Sheet 1 of 10 REF DES DESCRIPTION PART NO QTY C1 C2 Capacitor Monol...

Page 266: ...3 1066 1 C46 Capacitor Mica 330 pF 5 500V 042 3322 1 C47 thru Capacitor Monolythic Ceramic 0 1 uF 10 50V 003 1066 4 C50 C51 C52 Capacitor Mica 1000 pF 1 100V 041 1031 2 C53 Capacitor Monolythic Cerami...

Page 267: ...ramic 0 1 uF 10 50V 003 1066 7 C128 C129 C130 Capacitor Electrolytic 10 uF 35V Non Polarized 023 1075 2 C131 thru Capacitor Monolythic Ceramic 0 1 uF 10 50V 003 1066 3 C133 C134 Capacitor Mica 33 pF 5...

Page 268: ...r Programmable 2 Pin 340 0004 3 P7 P31 Jumper Programmable 2 Pin 340 0004 1 P201 Receptacle 50 Pin Dual In line 417 0147 1 Q1 Q2 Transistor 2N3904 NPN Silicon TO 92 Case 211 3904 2 Q3 thru Transistor...

Page 269: ...1 4W 100 5041 3 R48 R49 R50 Resistor 10 k Ohm 1 1 4W 100 1051 2 R51 Resistor 1 k Ohm 1 1 4W 100 1041 1 R52 Potentiometer 10 k Ohm 10 1 1 4W 179 1053 1 R53 Potentiometer 5 k Ohm 10 1W 179 5043 1 R54 R...

Page 270: ...10 1 1 4W 179 1053 1 R105 thru Resistor 10 k Ohm 1 1 4W 100 1051 5 R109 R110 Resistor 178 k Ohm 1 1 4W 103 1761 1 R111 Resistor Network 10 10 k Ohm 0 5 Resistors 0 7W Total 226 0392 1 Dissipation 16 P...

Page 271: ...W 103 2431 1 R169 Resistor 5 23 k Ohm 1 1 4W 103 5251 1 R170 thru Resistor 442 Ohm 1 1 4W 103 4423 3 R172 R173 Resistor 240 Ohm 1 1 4W 103 2431 1 R174 Resistor 3 01 k Ohm 1 1 4W 103 3014 1 R175 Resist...

Page 272: ...rmer RF DRIVE 370 0046 1 TP1 thru Terminal Turret Double Shoulder 413 1597 10 TP10 U1 Integrated Circuit TL072CP Dual JFET Input Operational 221 0072 1 Amplifier 8 Pin DIP U2 U3 Integrated Circuit 215...

Page 273: ...OS 228 4584 1 14 Pin DIP U43 Integrated Circuit MC14093B Quad 2 Input NAND Schmitt Trigger 220 4093 1 CMOS 14 Pin DIP U44 Integrated Circuit MC14013BCP Dual D Type Flip Flop CMOS 228 4013 1 14 Pin DIP...

Page 274: ...of 10 REF DES DESCRIPTION PART NO QTY C1 C2 Capacitor Electrolytic 10 uF 35V 023 1075 2 C3 thru Capacitor Monolythic Ceramic 0 1 uF 10 50V 003 1066 3 C5 C6 Capacitor Mica 1000 pF 1 100V 041 1031 1 C7...

Page 275: ...pF 5 500V 040 1022 1 C53 Capacitor Monolythic Ceramic 0 1 uF 10 50V 003 1066 1 C54 Capacitor Electrolytic 10 uF 50V 023 1076 1 C55 C56 Capacitor Monolythic Ceramic 0 1 uF 10 50V 003 1066 2 C57 C58 Cap...

Page 276: ...23 1076 1 C122 thru Capacitor Monolythic Ceramic 0 1 uF 10 50V 003 1066 3 C124 C125 Capacitor Electrolytic 1 uF 50V Non Polarized 020 1064 1 C126 thru Capacitor Monolythic Ceramic 0 1 uF 10 50V 003 10...

Page 277: ...peres 203 4148 17 D67 D68 Diode Zener 1N4739A 9 1V 5 1W 200 0009 1 D69 Diode Zener 1N4732A 4 7V 5 1W 200 4732 1 DS1 thru Indicator LED Green 521 9175 3V 40 mA Maximum 323 9224 5 DS5 E1 thru Terminal T...

Page 278: ...62 1 R19 Resistor 221 k Ohm 1 1 4W 103 2216 1 R20 Resistor Network 10 10 k Ohm 0 5 Resistors 0 7W Total 226 0392 1 Dissipation 16 Pin DIP R23 R24 Resistor 26 7 k Ohm 1 1 4W 103 2675 2 R25 thru Resisto...

Page 279: ...00 5673 1 R92 R93 Resistor 10 k Ohm 1 1 4W 100 1051 2 R94 Resistor 100 Ohm 1 1 4W 100 1031 1 R99 Resistor 34 k Ohm 1 1 4W 103 3405 1 R100 Resistor 66 5 k Ohm 1 1 4W 103 6655 1 R101 R102 Resistor 26 7...

Page 280: ...4W 100 1041 1 R163 Resistor 100 Ohm 1 1 4W 100 1031 1 R164 Resistor 1 k Ohm 1 1 4W 100 1041 1 R165 Resistor 2 21 k Ohm 1 1 4W 103 2241 1 R166 Resistor 1 k Ohm 1 1 4W 100 1041 1 R167 Resistor 2 21 k Oh...

Page 281: ...B Raytheon 8 Pin DIP 221 4227 1 U7 Integrated Circuit DG212CJ Quad SPST Switch 16 Pin DIP 220 0212 1 U8 U9 Amplifier Dual Operational RC4227GNB Raytheon 8 Pin DIP 221 4227 2 U10 Integrated Circuit MC1...

Page 282: ...l RC4227GNB Raytheon 8 Pin DIP 221 4227 1 U42 Integrated Circuit 74HC74N Dual D Flip Flop 221 7474 1 U43 Integrated Circuit TL311P JFET Input Differential Comparator 220 0311 1 8 Pin DIP U44 Integrate...

Page 283: ...et 1 of 2 REF DES DESCRIPTION PART NO QTY C1 C2 Capacitor Polyester 0 0022 uF 10 100V 031 2033 2 C3 C4 Capacitor Polyester 0 015 uF 10 100V 030 1532 2 C5 C6 Capacitor Polyester 0 0022 uF 10 100V 031 2...

Page 284: ...0 4723 1 R15 thru R18 Resistor 1 15 k Ohm 1 1 4W 103 1156 4 R19 thru R22 Resistor 51 1 Ohm 1 1 4W 103 5112 4 R23 thru R28 Resistor 1 15 k Ohm 1 1 4W 103 1156 6 R29 thru R34 Resistor 51 1 Ohm 1 1 4W 10...

Page 285: ...licon 75V 0 3 Amperes 203 4148 2 DS1 DS2 Indicator LED Yellow 521 9176 3V 30 mA Maximum 323 9225 2 DS7 LED MV57164 Red High Efficiency 10 Segment Bar Graph Array 320 7164 1 DS8 DS9 LED MV54164 Green H...

Page 286: ...31 4 R37 Resistor 100 k Ohm 1 1 4W 103 1062 1 R38 Resistor 10 k Ohm 1 1 4W 100 1051 1 R39 Resistor 10 Meg Ohm 5 1 4W 100 1083 1 R40 Resistor 10 k Ohm 1 1 4W 100 1051 1 R41 Resistor 2 21 k Ohm 1 1 4W 1...

Page 287: ...1 4W 103 2431 7 R112 R113 Resistor 174 Ohm 1 1 4W 100 1731 1 R114 Resistor 825 Ohm 1 1 4W 103 8253 1 S1 S2 Switch SPDT Momentary MP Series 2 Green C K 340 0130 2 MP01R2266 CBE S3 Switch SPDT Momentary...

Page 288: ...517 0306 001 1 TABLE 3 9 METER SWITCH CIRCUIT BOARD ASSEMBLY 917 0306 005 REF DES DESCRIPTION PART NO QTY C501 Capacitor Monolythic Ceramic 0 1 Ohm 10 50V 003 1066 1 D501 Diode Zener 1N4733A 5 1V 5 1W...

Page 289: ...sing SL 156 6 Position 417 0606 1 P3 Plug Ribbon Cable 26 Pin Dual In Line 418 2600 1 P7 Connector Housing 6 Pin 418 0670 1 P8 Connector Ribbon Cable 40 Conductor 418 4001 1 P10 Plug Ribbon Cable 26 P...

Page 290: ...7 0301 4 5 ASSEMBLY DIAGRAM ECU MOTHERBOARD AC917 0301 4 6 SCHEMATIC DIAGRAM EXCITER CIRCUIT BOARD SB917 0300 4 7 ASSEMBLY DIAGRAM EXCITER CIRCUIT BOARD AC917 0300 4 8 COMPONENT LOCATOR ECU EXCITER BO...

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Page 297: ...D3 C1 D4 C1 D5 C1 D6 C1 D7 C2 D8 C2 D9 C2 D10 C2 D11 C2 D12 C2 D13 C1 D14 C1 D15 C2 D16 C2 D17 C2 D18 B1 D19 A1 D20 B1 D21 A1 D22 B1 D23 B1 B2 D24 B3 D25 B1 D26 B1 D27 B1 D28 B2 D29 B3 D30 B2 D31 B2 D...

Page 298: ...149 B2 B3 TP3 B3 TP4 B3 TP5 B3 TP6 B3 TP7 B1 TP8 C2 TP9 C3 TP10 C3 TP11 C3 U1 C1 U2 C1 U3 C1 C2 U4 C2 U5 C2 U6 C2 U7 B1 C1 U8 B1 C1 U9 B2 C2 U10 B2 C2 U11 B2 C2 U12 C2 U13 C2 U14 C1 U15 C1 U16 C2 U17...

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