Broadcast Electronics AM-10A Manual Download Page 123

Page: 123 / 141

3-18

TABLE 3-6. ECU CONTROLLER CIRCUIT BOARD ASSEMBLY - 917-0205

(Sheet 6 of 10)

REF. DES.

DESCRIPTION

PART NO.

QTY.

R123

Resistor, 100 k Ohm

1%, 1/4W

103-1062

R124

Resistor, 5.76 k Ohm

1%, 1/4W

103-5764

R125

Resistor, 3.3 Meg Ohm

5%, 1/4W

100-3373

R126

Resistor, 240 Ohm

1%, 1/4W

103-2431

R127 thru

Resistor, 240 Ohm ñ1%, 1/4W

103-2431

R130
R131 thru

Resistor, 100 k Ohm

1%, 1/4W

103-1062

R133
R134

Resistor, 10 k Ohm

1%, 1/4W

100-1051

R135

Resistor, 1 k Ohm

1%, 1/4W

100-1041

R136

Resistor, 90.9 k Ohm

1%, 1/4W

103-9095

R137

Resistor, 10 k Ohm

1%, 1/4W

100-1051

R138

Resistor, 100 k Ohm

1%, 1/4W

103-1062

R139, R140

Resistor, 1 k Ohm

1%, 1/4W

100-1041

R141

Resistor, 100 k Ohm

1%, 1/4W

103-1062

R142

Resistor, 1 k Ohm

1%, 1/4W

100-1041

R143

Potentiometer, 500 Ohm

10%, 1 1/4W

178-5001

R144

Resistor, 750 Ohm

1%, 1/4W

103-7503

R145 thru

Resistor, 90.9 k Ohm

1%, 1/4W

103-9095

R147
R148 thru

Resistor, 47.5 k Ohm,

1%, 1/4W

103-4755

R150
R151

Resistor, 90.9 k Ohm

1%, 1/4W

103-9095

R152

Resistor, 10 k Ohm

1%, 1/4W

100-1051

R153

Resistor, 499 Ohm

1%, 1/4W

103-4993

R154, R155

Resistor, 10 k Ohm

1%, 1/4W

100-1051

R156

Resistor, 1 k Ohm

1%, 1/4W

100-1041

R157

Resistor, 90.9 k Ohm

1%, 1/4W

103-9095

R158

Resistor, 10 k Ohm

1%, 1/4W

100-1051

R159

Resistor, 100 k Ohm

1%, 1/4W

103-1062

R160

Resistor, 1 k Ohm

1%, 1/4W

100-1041

R161

Resistor, 301 k Ohm

1%, 1/4W

103-3061

R162

Resistor, 100 k Ohm

1%, 1/4W

103-1062

R163

Resistor, 499 Ohm

1%, 1/4W

103-4993

R164, R165

Resistor, 10 k Ohm

1%, 1/4W

100-1051

R166

Resistor, 100 k Ohm

1%, 1/4W

103-1062

R167

Resistor, 3.3 Meg Ohm

5%, 1/4W

100-3373

R168

Resistor, 10 k Ohm

1%, 1/4W

100-1051

R169

Resistor, 100 k Ohm

1%, 1/4W

103-1062

R170

Resistor, 1 k Ohm

1%, 1/4W

100-1041

R171

Resistor, 1 k Ohm,

1%, 1/4W

103-2615

R172, R173

Resistor, 100 k Ohm

1%, 1/4W

103-1062

R174 thru

Resistor, 10 k Ohm

1%, 1/4W

100-1051

R176
R177

Resistor, 1 Meg Ohm

1%, 1/4W

103-1007

R179, R181

Resistor, 1 k Ohm

1%, 1/4W

100-1041

R183, R184

Resistor, 392 Ohm

1%, 1/4W

103-3923

R187, R188

Resistor, 100 k Ohm

1%, 1/4W

103-1062

Summary of Contents for AM-10A

Page 1: ...tion 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 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 14 Removing Installing a Power Supply ...

Page 2: ...f power transformer T1 is applied to bridge rectifier D11 D11 rectifies the ac potential into an unregulated 30V dc supply for application to the RF power module power amplifier circuit boards Capacitor C21 provides filtering for the supply AC power from a second winding of transformer T1 is applied to bridge rectifier D10 D10 recĆ tifies the ac potential into an unregulated 20V dc supply for the ...

Page 3: ...f 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 power will be muted and 2 no transmitter fault or emergency condition will be generated 1 16 SOFT START CONTROL CIRCUIT The soft start control circuit consists of 1 transistors Q4 through Q9 and 2 integrated circuit U7 T...

Page 5: ...on is required the controller will output a LOW power supply enable signal to optiĆ 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 output a HIGH to U12B With a HIGH from U21A U21B U12B will output a HIGH to U12C and to Q12 With a HIGH from U14 indicating the...

Page 6: ...s 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 applied to circuitry on the modulator circuit board 1 34 POWER CONTROL CORRECTION CIRCUIT 1 35 The switching regulator output voltage is controlled by a PWM pulse width modulated signal from the co...

Page 7: ...fault 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 seĆ quence to enable the crowbar circuit refer to the following text Transistor Q15 will be biased off and will disable optical coupler U10 The output of U10 will open 1 42 The output of U10 is connected in parallel with U10 on each power supply c...

Page 8: ...trolled 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 supply The 0VI ground is the circuit ground for the 1 crowbar circuit 2 switching regulator circuit 3 inverting drive buffers and 4 switching regulator transistors The circuit grounds are used in asso...

Page 9: ...nsmitters 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 personnel simultaneously touch a circuit ground and the cabinet As a result operation of the transmitter with test equipment connected to transmitter output network RF power module RF combiner or power su...

Page 10: ...OWER SUPPLY COMPONENTS 2 13 SAFETY CONSIDERATIONS The AM 10A AM 6A transmitters are equipped with extensive indicator and meter circuitry to allow the operator to isolate problems to a specific area within the transmitter Due to the hazardous voltages and currents contained in the equipment operation of the transmitter with test equipment connected to transmitter output network RF power module RF ...

Page 11: ...Using 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 condition check transistor Q23 2 If the voltmeter indicates a shorted condition proceed as follows a On Q21 place the negative lead on the drain center pin and the positive lead on the gate and record th...

Page 12: ...Check 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 is not present defective U3 on the power supply circuit board 2 Re install the power supply circuit board and operate the transmitter If the circuit board remains defective contact the Broadcast Elect...

Page 13: ...le entry in this section is indexed by reference designators appearing on the appliĆ cable schematic TABLE 3 1 REPLACEABLE PARTS LIST INDEX TABLE DESCRIPTION PART NO PAGE 3 2 Power Supply Panel Assembly 957 0315 3 2 3 3 Power Supply Circuit Board Assembly 917 0315 001 3 2 3 4 Power Supply Panel Harness AM 10A 947 0189 3 9 3 5 Power Supply Capacitor Circuit Board Assembly 917 0315 004 3 9 3 6 Power...

Page 14: ...olythic Ceramic 0 1 uF 10 50V 003 1066 1 C2 Capacitor Monolythic Ceramic 0 01 uF 5 100V 003 1013 1 C3 Capacitor Ceramic 0 001 uF 10 200V 030 1033 1 C4 Capacitor Electrolytic 2200 uF 35V 014 2293 1 C5 C6 Capacitor Monolythic Ceramic 0 1 uF 10 50V 003 1066 2 C7 C8 Capacitor Monolythic Ceramic 0 1 uF 10 50V 003 1066 2 C9 Capacitor Electrolytic 10 uF 50V 023 1076 1 C10 Capacitor Monolythic Ceramic 0 0...

Page 15: ...6 C57 Capacitor Ceramic 0 001 uF 10 200V 030 1033 2 C58 Capacitor Monolythic Ceramic 0 1 uF 10 50V 003 1066 1 C59 C60 Capacitor Monolythic Ceramic 0 01 uF 5 100V 003 1013 2 C61 Capacitor Monolythic Ceramic 0 1 uF 10 50V 003 1066 1 C62 Capacitor Electrolytic 10 uF 35V 023 1075 1 C63 Capacitor Electrolytic 10 uF 50V 023 1076 1 C64 Capacitor Monolythic Ceramic 0 01 uF 5 100V 003 1013 1 C65 C66 Capaci...

Page 16: ... MUR4100E 4 Amperes 1000V 230 0017 1 D17 Rectifier MR2406 24 Amperes 600V 230 0015 1 D18 Diode Zener 1N4733A 5 1V 5 1W 200 4733 1 D19 Diode 1N4005 Silicon 600V 1 Ampere 203 4005 1 D20 thru Diode 1N4148 Silicon 75V 0 3 Amperes 203 4148 3 D22 D23 Diode 1N4005 Silicon 600V 1 Ampere 203 4005 1 D24 Diode 1N4148 Silicon 75V 0 3 Amperes 203 4148 1 D25 Bridge Rectifier NAE 3060A 1 Amp 200V 239 0001 1 D26 ...

Page 17: ...2N3904 NPN Silicon TO 92 Case 211 3904 2 Q21 Q22 Transistor Insulated Gate Bipolar IRGPC50U TO 247 Case 210 4060 2 Q23 RF FET APT6018 600V 210 6018 1 Q24 Transistor 2N27000 FET N Channel TO 92 Case 210 7000 1 Q25 Field Effect Transistor J3100 RF N Channel TO 92 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 ...

Page 18: ... 3373 1 R46 Resistor 100 Ohm 1 1 4W 100 1031 1 R47 Resistor 1 10 k Ohm 1 1 4W 103 1104 1 R48 R49 Resistor 47 Ohm 5 2W 130 4723 2 R52 Resistor 2 21 k Ohm 1 1 4W 103 2241 1 R53 Resistor 3 3 Meg Ohm 5 1 4W 100 3373 1 R54 Resistor 10 k Ohm 1 1 4W 100 1051 1 R55 Resistor 3 3 Meg Ohm 5 1 4W 100 3373 1 R56 Resistor 10 k Ohm 1 1 4W 100 1051 1 R57 Resistor 1 33 k Ohm 1 1 4W 103 1331 1 R58 Resistor 100 k Oh...

Page 19: ...tor 33 2 k Ohm 1 1 4W 103 3325 1 R100 R101 Resistor 5 11 k Ohm 1 1 4W 103 5141 2 R102 R103 Resistor 100 k Ohm 1 1 4W 103 1062 2 R104 Resistor 3 32 k Ohm 1 1 4W 103 3324 1 R105 thru Resistor 0 1 Ohm 1 10W WW 130 1010 3 R107 R108 Resistor 475 Ohm 1 1 4W 103 4753 1 R109 Resistor 162 Ohm 1 1 4W 100 1631 1 R110 Resistor 51 1 Ohm 1 1 4W 103 5112 1 R111 thru Resistor 10 k Ohm 1 1 4W 100 1051 7 R117 R118 ...

Page 20: ... Pin DIP U8 thru U11 Integrated Circuit 4N33 Optical Isolator NPN Photo 229 0033 4 Transistor Infared Emitting Diode Type 1500V Isolation Response 30 kHz Maximum Current 50 mA Maximum 6 Pin DIP U12 Integrated Circuit CD4081B Quad 2 Input AND Gate CMOS 225 0008 1 14 Pin DIP U13 Integrated Circuit SG3525AN PWM Control 228 3525 1 U14 U15 Integrated Circuit 4N33 Optical Isolator NPN Photo 229 0033 2 T...

Page 21: ...17 0372 16 Connector Female PLB16F0000 Positronic 417 0377 1 TABLE 3 5 POWER SUPPLY CAPACITOR CIRCUIT BOARD ASSEMBLY 917 0315 004 REF DES DESCRIPTION PART NO QTY C87 thru C90 Capacitor Electrolytic 7200 uF 200 WVDC 014 7200 4 MOV3 Metal Oxide Varistor V130LA10A 130V ac RMS 10 Joules 140 0006 1 Blank Power Supply Capacitor Circuit Board AM 1A 517 0315 004 1 TABLE 3 6 POWER SUPPLY BULK CAPACITOR CIR...

Page 22: ...ings wiring diagrams and schematic diagrams as listed below for the Broadcast Electronics AM 10A AM 6A power supply circuit board FIGURE TITLE NUMBER 4 1 SCHEMATIC DIAGRAM POWER SUPPLY CIRCUIT BOARD SB917 0315 001 002 003 004 005 4 2 ASSEMBLY DIAGRAM POWER SUPPLY CIRCUIT BOARD AC917 0315 001 002 003 004 005 ...

Page 23: ...fety 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 Assembly Procedure 2 3 2 16 RF Power Module Exchange Program 2 3 2 17 Troubleshooting Procedures 2 3 2 18 Component Replacement Procedure 2 3 SECTION III RF POWER MODULE PARTS LIST 3 1 Introduction 3 1...

Page 24: ...ages 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 1 at 2 volts and 2 a logic 0 at 0 8 volts The output of U2 is applied to the gate of forward converter transistor Q1 The output of U13 is applied to the gate of forward conĆ verter transistor Q2 Q1 an...

Page 25: ...odulator 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 U7A U7B and U7C 3 inverters U5B U5D and U5G and 4 optical couplers U8 and U9 When a LOW from the modulator fault detector or the B supply fuse fault detector is applied to NAND gate U6A U6A will outpu...

Page 27: ...he transistor drain to source voltĆ 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 to the turn on of the transistor The Class E circuit results in 1 reduced device dissipation and lowers the transistor operating temperature which greatly increases the life of the components 2 an...

Page 28: ...28 The fault detector functions by monitoring fuses F1 and F2 When fuse F2 is blown tranĆ sistor Q11 will output 20 volts to silicon controlled rectifier SCR Q13 When fuse F1 is blown optical coupler U3 will output 20 volts to SCR Q13 When either voltage is presĆ ent the voltage will bias Q13 on to illuminate PA fault indicator DS2 and bias optical couĆ pler U4 on U4 will respond by routing a PA f...

Page 30: ...in 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 simultaneously touch a circuit ground and the cabinet As a result operation of the transmitter with test equipment connected to transmitter output network RF power module RF combiner or power supply components...

Page 31: ...RNING WARNING WARNING WARNING THE TRANSMITTER CONTAINS MULTIPLE CIRCUIT GROUNDS WITH HIGH AC AND DC POTENTIALS WITH RESPECT TO THE CABINET WHICH IS AT EARTH POTENTIAL DO NOT ENERGIZE THE TRANSMITTER WITH TEST EQUIPMENT CONĆ NECTED TO THE TRANSMITTER OUTPUT NETWORK RF POWER MODULE RF COMBINER OR POWER SUPPLY COMPONENTS CAUTION CAUTION REMOVING OR INSTALLING AN RF POWER MODULE WITH THE TRANSMITTER E...

Page 32: ...the top edge of the circuit board is straight B Secure the two Phillips head screws which mount the circuit board 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 Phillips head screws mounting the circuit board to the bracket when each circuit board is pr...

Page 33: ... 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 the voltage is greater than 0 1 volt of the reference defective Q1 Q3 and Q5 B If the voltage is equal to the reference repeat the preceding step for transistor Q2 on the defective power amplifier circ...

Page 34: ...s 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 lead on the drain of Q1 center pin and the positive lead on the gate and determine the voltage The voltage using a Fluke 77 meter 1 2V 2 Place the negative lead on the drain of Q1 and the positive lead ...

Page 35: ...K 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 remains defective replace U2 and U13 6 If the modulator remains defective contact the Broadcast Electronics Customer Service Department ...

Page 36: ...sembly 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 6 Power Module Frequency Dependant Kit 651 770 kHz 957 1015 002 3 8 3 7 Power Module Frequency Dependant Kit 771 920 kHz 957 1015 003 3 8 3 8 Power Module Frequency Dependant Kit 921 1080 kHz 957 10...

Page 37: ...ic 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 Capacitor Electrolytic 10 uF 50V 023 1076 1 C23 Capacitor Electrolytic 22 uF 50V 024 2274 1 C24 Capacitor Electrolytic 10 uF 50V 023 1076 1 C25 Capacitor Electrolytic 22 uF 50V 024 2274 1 C26 C27 Capaci...

Page 38: ...icon 75V 0 3 Amperes 203 4148 4 D24 D25 Diode 1N5817 Schottky 20V 1 Amperes 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 323 9217 1 DS3 Indicator LED Green 521 9175 3V 40 mA Maximum 323 9224 1 DS4 Indicator LED Red 521 9212 1 7V 50 mA Maximum 323 9217 1 F1 Fuse 3AG 20 Amperes 250V 330 2000 1 F2 Fuse AGC 1 Ampere MDL 250V ...

Page 39: ...1331 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 100 8641 1 R43 Resistor 499 k Ohm 1 1 4W 103 4996 1 R44 Resistor 8 25 k Ohm 1 1 4W 103 8254 1 R45 Resistor 1 k Ohm 1 1 4W 100 1041 1 R46 Resistor 1 Meg Ohm 1 1 4W 103 1007 1 R47 thru R49 Resistor 10 k ...

Page 40: ...um 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 Socket 14 Pin DIP 417 1404 1 XU4 Socket 6 Pin DIP 417 0600 1 XU5 Socket 16 Pin DIP 417 1604 1 XU6 Socket 14 Pin DIP 417 1404 1 XU7 Socket 16 Pin DIP 417 1604 1 XU8 XU9 Socket 6 Pin DIP 417 0600 2 XU11 Socket 16 Pin DIP 417 1604 1 XU13 Socket 6 Pin DIP 417 06...

Page 41: ... Diode Zener 1N5229 4 3V 0 5W 201 0035 1 D16 Diode Transzorb Diode 300BV 1 5FE300CA 206 0300 1 D17 Transzorb Diode 250BV 1 5KE250CA 206 0250 1 D18 Diode Transzorb Diode 300BV 1 5FE300CA 206 0300 1 D19 Transzorb Diode 250BV 1 5KE250CA 206 0250 4 D20 D21 Diode Zener 1N4749 24V 10 5 Amperes 200 0024 2 D22 D23 Diode 1N4005 Silicon 600V 1 Ampere 203 4005 2 D25 D26 Diode 1N4148 Silicon 75V 0 3 Amperes 2...

Page 42: ...istor 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 103 3323 1 R29 Resistor 300 Ohm 5 2W W W 130 3004 1 R30 R31 Resistor 2 67 k Ohm 1 1 4W 103 2674 2 R32 R33 Resistor 100 Ohm 1 1 4W 100 1031 2 R34 R35 Resistor 10 k Ohm 1 1 4W 100 1051 2 R36 R37 Resistor 300 Ohm 5 2W W W 130 3004 2 R38 Resistor 562 Ohm 1 1...

Page 43: ...nk 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 NO QTY C47 thru C54 Capacitor Mica 1800 pF 1 kV 042 1832 16 L3 L4 Inductor PA Drive 360 0113 XXX 4 Blank PA Capacitor Board Circuit Board 517 0318 001 2 Blank PA Inductor Board Circuit Board 517 0319...

Page 44: ...6 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 Circuit Board 517 0318 001 2 Blank PA Inductor Board Circuit Board 517 0319 001 2 TABLE 3 11 POWER MODULE FREQUENCY DEPENDANT KIT 1581 1700 KHZ 957 1015 007 REF DES DESCRIPTION PART NO QTY C49 C52 Capa...

Page 45: ...s listed below for the Broadcast Electronics AM 10A AM 6A transmitter RF power module FIGURE TITLE NUMBER 4 1 SCHEMATIC DIAGRAM MODULATOR CIRCUIT BOARD SB917 0302 4 2 ASSEMBLY DIAGRAM MODULATOR CIRCUIT BOARD AD917 0302 4 3 SCHEMATIC DIAGRAM POWER AMPLIFIER CIRCUIT SB917 0304 BOARD 4 4 ASSEMBLY DIAGRAM POWER AMPLIFIER CIRCUIT AD917 0304 BOARD ...

Page 46: ...onal 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 Replacement Procedure 2 3 SECTION III OUTPUT NETWORK ASSSEMBLY PARTS LIST 3 1 Introduction 3 1 SECTION IV OUTPUT NETWORK ASSEMBLY DRAWINGS 4 1 Introduction 4 1 LIST OF TABLES TABLE TITLE PAGE NO 2 1 DIRECTIONA...

Page 47: ...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 theory of operation for the outĆ put network assembly components is presented in PART I SECTION IV THEORY OF OPĆ ERATION Refer to SECTION IV as required for a description of the output network asĆ sem...

Page 48: ...ntain 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 simultaneously touch a circuit ground and the cabinet As a result operation of the transmitter with test equipment connected to transmitter output network RF power module RF combiner or power supply compone...

Page 49: ... 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 WARNING WARNING WARNING WARNING THE TRANSMITTER CONTAINS MULTIPLE CIRCUIT GROUNDS WITH HIGH AC AND DC POTENTIALS WITH RESPECT TO THE CABINET WHICH IS AT EARTH POTENTIAL DO NOT ENERGIZE THE TRANSMITT...

Page 50: ...T 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 SPARK GAP TROUBLESHOOTĆ ING SYMPTOM CIRCUITRY TO CHECK HIGH REFLECTED POWER 1 Check the lightning detection circuit board for a CONDITION short circuit condition NO LIGHTNING DETECTION 1 Check the spa...

Page 51: ...rk Frequency Dependant Parts 522 650 957 1035 101 3 5 KHZ AM 10A 3 8 Output Network Frequency Dependant Parts 522 650 957 1035 061 3 6 KHZ AM 6A 3 9 Output Network Frequency Dependant Parts 651 770 957 1035 102 3 6 KHZ AM 10A 3 10 Output Network Frequency Dependant Parts 651 770 957 1035 062 3 6 KHZ AM 6A 3 11 Output Network Frequency Dependant Parts 771 920 957 1035 103 3 7 KHZ AM 10A 3 12 Output...

Page 52: ...ARTS LIST INDEX Sheet 2 of 2 TABLE DESCRIPTION PART NO PAGE 3 19 Output Network Frequency Dependant Parts 1581 1700 957 1035 107 3 10 KHZ AM 10A 3 20 Output Network Frequency Dependant Parts 1581 1700 957 1035 067 3 10 KHZ AM 6A ...

Page 53: ...ightning Detector Circuit Board Assembly 917 0306 004 1 TABLE 3 3 LIGHTNING PROTECTION CIRCUIT BOARD AM 6A AM 10A 917 0216 001 002 REF DES DESCRIPTION PART NO QTY FOR 957 0216 001 ASSEMBLY AM 6A D2 thru D6 Transzorb 1 5KE300CA 300BV 206 0300 5 D1 D7 Transzorb 1 5KE400CA 400BV 206 0400 2 FOR 957 0216 002 ASSEMBLY AM 10A D1 thru D8 Transzorb 1 5KE400CA 400BV 206 0400 8 Blank Lightning Protection Cir...

Page 54: ...Double Shoulder 413 0025 3 E221 J201 Receptacle Male 20 Pin In Line 417 0200 1 J202 J203 Receptacle Male 8 Pin In Line Right Angle 417 0080 001 2 J204 thru Receptacle Male 20 Pin In Line 417 0200 3 J206 K201 thru Relay SPST 5V dc 500 Ohm Reed 270 0062 5 K205 L201 Coil Molded Shielded 5 6 uH 364 0056 1 L202 Coil Molded Shielded 56 uH 360 0093 1 L203 L204 RF Choke 10 mH 10 6 3 Ohms DC Resistance 220...

Page 55: ...3 thru Receptacle Male 2 Pin In line 417 4004 3 J405 P403 thru Jumper Programmable 2 Pin 340 0004 3 P405 Q401 Phototransistor 1 8 mA IC AT 5V 215 0001 1 S401 Finger Contact Strip 469 0369 1 Blank Lightning Detector Circuit Board 517 0306 004 1 TABLE 3 7 OUTPUT NETWORK FREQUENCY DEPENDANT PARTS 522 650 KHZ AM 10A 957 1035 101 REF DES DESCRIPTION PART NO QTY C1A C1B Capacitor Mica 2700 pF 12 kV 22 A...

Page 56: ... 15 Amperes 044 1123 293 1 C2B Capacitor Mica 1600 pF 15 kV 18 Amperes 044 1623 293 1 C3A C3B Capacitor Mica 2200 pF 12 kV 20 Amperes 044 2223 293 2 C4 Capacitor Mica 6800 pF 10 kV 33 Amperes 044 6823 293 1 C5A C5B Capacitor Mica 910 pF 10 kV 9 1 Amperes 044 9113 292 3 C5C L1 Coil All Frequency 360 1111 XXX 1 L2 Coil All Frequency 360 1112 XXX 1 L3 Coil All Frequency 360 1113 XXX 1 L5 Coil Output ...

Page 57: ...10 kV 8 2 Amperes 044 6213 292 1 C7 Capacitor Mica 6800 pF 4 kV 18 Amperes 044 6823 291 1 L1 Coil All Frequency 360 1111 XXX 1 L2 Coil All Frequency 360 1112 XXX 1 L3 Coil All Frequency 360 1113 XXX 1 L5 Coil Output Network 360 1115 XXX 1 TABLE 3 12 OUTPUT NETWORK FREQUENCY DEPENDANT PARTS 771 920 KHZ AM 6A 957 1035 063 REF DES DESCRIPTION PART NO QTY C2 Capacitor Mica 2200 pF 12 kV 20 Amperes 044...

Page 58: ...itor Mica 4700PF 6KV 16A 5 044 4723 291 1 C1A C1B Capacitor Mica 1600PF 10KV 12 0A 5 044 1623 292 2 C3A C3B Capacitor Mica 1600PF 10KV 12 0A 5 044 1623 292 2 C5A C5B Capacitor Mica 1100PF 6KV 8 2A 5 044 1123 291 2 L1 Coil All Frequency 360 0601 XXX 1 L2 Coil All Frequency 360 0602 XXX 1 L3 Coil All Frequency 360 0603 XXX 1 L5 Coil All Frequency 360 0605 XXX 1 TABLE 3 15 OUTPUT NETWORK FREQUENCY DE...

Page 59: ...requency 360 0601 XXX 1 L2 Coil All Frequency 360 0602 XXX 1 L3 Coil All Frequency 360 0603 XXX 1 L5 Coil All Frequency 360 0605 XXX 1 TABLE 3 17 OUTPUT NETWORK FREQUENCY DEPENDANT PARTS 1301 1580 KHZ AM 10A 957 1035 106 REF DES DESCRIPTION PART NO QTY C1A C1B Capacitor Mica 1800 pF 15 kV 18 Amperes 044 1823 293 2 C2A C2B Capacitor Mica 620 pF 20 kV 11 Amperes 044 6213 293 2 C3A C3B Capacitor Mica...

Page 60: ...Capacitor Mica 1100 pF 20 kV 15 Amperes 044 1123 293 2 C4 Capacitor Mica 2700 pF 12 kV 22 Amperes 044 2723 293 1 C5A C5B Capacitor Mica 430 pF 10 kV 6 2 Amperes 044 4313 292 3 C5C C6 Capacitor Mica 2200 pF 6 kV 12 Amperes 044 2223 291 1 C7 Capacitor Mica 1800 pF 6 kV 11 Amperes 044 1823 291 1 C8 Capacitor Mica 3600 pF 6 kV 15 Amperes 044 3623 291 1 L1 Coil All Frequency 360 1111 XXX 1 L2 Coil All ...

Page 61: ... NETWORK FREQUENCY DEPENDANT PARTS 1581 1700 KHZ AM 6A 957 1035 067 Sheet 2 of 2 REF DES DESCRIPTION PART NO QTY L2 Coil All Frequency 360 0602 XXX 1 L3 Coil All Frequency 360 0603 XXX 1 L5 Coil All Frequency 360 0605 XXX 1 ...

Page 62: ...UMBER 4 1 SCHEMATIC DIAGRAM AM 10A OUTPUT NETWORK SB957 0030 ASSEMBLY 4 2 SCHEMATIC DIAGRAM AM 6A OUTPUT NETWORK SB957 0032 ASSEMBLY 4 3 SCHEMATIC DIAGRAM DIRECTIONAL COUPLER SB917 0306 002 CIRCUIT BOARD 4 4 SCHEMATIC DIAGRAM LIGHTNING DETECTOR SB917 0306 004 CIRCUIT BOARD REFER TO PART I SECTION VII FOR THE ECU AD917 0306 001 DISPLAY CIRCUIT BOARD ASSEMBLY 002 003 004 005 006 007 009 014 4 5 ASSE...

Page 63: ...wer 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 Protection 1 13 1 71 Attack Signal Operation 1 16 1 73 1 2 1 VSWR Conditions 1 16 1 74 Foldback Recovery 1 16 1 82 Exciter Monitoring 1 17 1 84 Power Supply Monitoring 1 18 1 88 RF Power Module Monit...

Page 64: ... 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 2 2 2 13 Second Level Maintenance 2 2 2 15 Electrical Adjustments 2 2 2 17 ECU Extender Circuit Board Operation 2 3 2 19 Controller Circuit Board Adjustments 2 3 2 20 P1 Set P5 Set Controls 2 3 2 21...

Page 65: ...ECTION 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 1 3 STEREO CIRCUIT BOARD 1 27 SIMPLIFIED SCHEMATIC LIST OF TABLES TABLE TITLE PAGE NO 2 1 EXCITER CIRCUIT BOARD TROUBLESHOOTING 2 7 2 2 STEREO CIRCUIT BOARD TROUBLESHOOTING 2 9 2 3 CONTROLLER CIRCUI...

Page 66: ...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 The meter display circuitry consists of a driver circuit and a stereo 30 segment LED bar graph display 1 8 The ECU display circuit board also contains left L R and right L R audio metering circuits T...

Page 67: ...eter 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 integrated circuits U9 U10 and U11 and 2 10 segment LEDs DS7 DS8 and DS9 The output from U8B is applied to meter drivers U9 U10 and U11 U9 U10 U11 control 10 segment LED sections DS7 DS8 and DS9 Drivers...

Page 68: ...sembly 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 display circuitry includes exciter power supply power module antenna interlock remote control lightning antenna interlock foldback and over temperature networks The circuitry determines the transmitter ou...

Page 69: ...GH will also bias driver transistor Q48 on to illuminate remote failĆsafe indicator DS2 When the remote control failĆsafe signal is removed a LOW is applied to U56 The output of U56 will go LOW The LOW generates a LOW transmitter operate command to mute 1 the exciter PWM signal 2 the power supply circuit board s and 3 extinguish remote failĆsafe indicator DS2 The LOW from U56 will generate a LOW f...

Page 72: ...ations 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 control unit 1 37 Remote control of the transmitter is enabled or disabled by remote local switch S4 S4 enables remote control operation by applying a positive voltage to optical couplers U1 through U6 U...

Page 73: ...e 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 board s If the cabinet or external interlock is opened AND gate U71B will output a LOW cabinet command A LOW cabinet command configures the power control circuit to operate the transmitter to off U71D w...

Page 74: ...tch 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 U35 and increases the power control reference voltage generated from power control D to A converter U42 U42 outputs the increased reference voltage to the power control driver circuit to increase the R...

Page 75: ... 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 from generating an ac fail command 1 53 When ac power interruption is detected U68B 1 routes a HIGH pulse to one shot U57A OR gate U62C and inverter U54C and 2 outputs a LOW ac fail command U57A will...

Page 76: ... circuit 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 temperature for over temperature conditions 2 reflected power for a high reflected power condition 3 forward power for high forward power conditions and 4 lightning detector for lightning conditions When ...

Page 77: ...ty 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 U67A to output a HIGH reflected power signal to enable latch U48D U48D will output a to HIGH to bias 1 alarm status indicator driver transistors Q34 and Q35 on and 2 antenna mismatch indicator driver Q2...

Page 78: ...Q34 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 Q38 The output of Q38 will flash to generate a flashing red antenna status indicator Transistor Q29 will be biased on to provide a LOW remote reflected power emergency signal 1 67 Lightning Condition...

Page 79: ...C 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 signal from U51A U51B will output a LOW to AND gate U50D With a HIGH from U50C and a LOW from U51A AND gate U52C will output a LOW to U50D U50D will respond by routing a LOW to antenna status red indicat...

Page 80: ...26 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 an increased voltage reference to U43 U43 will output an increased reference voltage to increase the transmitter output power 1 80 Reflected Power Emergency Lightning Recovery When the condition whi...

Page 81: ...GH 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 the power supply maintenance fault status input will go HIGH The HIGH is applied to NOR gate U52D U52D will output a LOW to bias transistor Q42 on This will illuminate the power supply indicator red LE...

Page 82: ...ler 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 15 seconds Conditions causing the transmitter to over cycle off include ac failure and manual on off control operation The circuit consists of AND gate U22A inverter U25F pulse generator U59B capacito...

Page 83: ... 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 signal conversion The output of the instrumentation amplifier is applied to a defeatable high frequency boost circuit The high frequency boost circuit is designed to increase high frequency response to...

Page 84: ...es 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 output of the limiter is applied a incidental phase modulation IPM correction circuit and a PWM circuit A sample from the negative limiter circuit is applied to comparator U43 When the negative limiter c...

Page 85: ...ectangular 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 The control voltage is used by the VCO module to generate a precision frequency reference A constant current source for the VCO module is provided by transistor Q3 1 114 Precision alignment of the V...

Page 87: ...ircuit 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 consisting of integrated circuits U32A U30B U32C and U32D 1 123 The mono stereo select circuit will route a stereo or mono signal to an RF drive circuit in response to the presence of stereo If a ste...

Page 88: ...CUIT 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 control signal and 2 an RF present signal from transistor Q8 and latch U40 The circuit is designed to output a HIGH during the following conditions 1 the loss of the PWM signal or 2 the loss of the RF...

Page 90: ...e 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 microsecond delay select jumper J1B J1B allows the delay circuit to be bypassed if 4 microseconds of delay is not required for equalization operation 1 136 ALL PASS FILTER Integrated circuit U5B is confi...

Page 91: ...verter 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 display circuit board 1 142 PHASE MODULATOR CIRCUIT 1 L R 1 L R L R and L R signals are applied to a phase modulator circuit The phase modulator circuit consists of 1 phase modulator U36 2 a synchronou...

Page 92: ...rease 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 output of U40B is routed for application to the exciter circuit board 1 150 OPERATING MODE SELECTION AND INDICATION CIRCUIT The stereo circuit board can be configured for stereo mono left mono right ...

Page 93: ... 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 is selected U41B will output a LOW to NAND gate U43A Programmable jumper P7 programs the equalization selection circuit for momentary or continuous signals With P7 programmed for momentary signals U43...

Page 94: ... 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 the ac failure If an extended ac power failure occurs the transmitter will be operated to off by an ac loss auto shutdown circuit on the controller circuit board ...

Page 95: ...gh 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 cabinet As a result operation of the transmitter with test equipment connected to transmitter output network RF power module RF combiner or power supply components is extremely dangerous and must no...

Page 96: ...nd the results recorded in a performance log 2 11 CLEANING AND INSPECTION WARNING WARNING NEVER OPEN THE EQUIPMENT UNLESS ALL TRANSĆ MITTER PRIMARY POWER IS DISCONNECTED ENĆ SURE ALL TRANSMITTER PRIMARY POWER IS DISĆ CONNECTED BEFORE ATTEMPTING MAINTENANCE ON ANY AREA WITHIN THE TRANSMITTER 2 12 Clean the ECU circuit boards of accumulated dust as required using a nylon bristle brush and vacuum cle...

Page 97: ...TMENT 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 critical nature of the FWD CAL and RFL CAL controls the controls are not considered field adjustable If the controls are required to be adjusted contact the Broadcast Electronics Customer Service Departm...

Page 98: ...mation 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 nature of the symmetry control the control is not considered field adjustable If the control is to be adjusted contact the Broadcast Electronics Customer Service Department for information and instruct...

Page 99: ...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 TRANSMITTER PRIMARY POWER BEFORE PROCEEDING 2 46 Disconnect all transmitter primary power 2 47 Remove all test equipment 2 48 FREQUENCY CALIBRATION CONTROL Frequency calibration control C108 calibrates the exci...

Page 100: ...modulation 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 POWER BEFORE PROCEEDING 2 65 Disconnect all transmitter primary power and remove all test equipment 2 66 TROUBLESHOOTING WARNING WARNING WARNING WARNING THE TRANSMITTER CONTAINS MULTIPLE CIRCUIT GROUNDS...

Page 101: ...A 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 present defective Q3 or C106 B If the square wave signal at U25 is below FcX4 or FcX8 measure the dc voltage at J8 of the VCO assembly 1 If the dc voltage at TP7 is greater than 13 volts defective VCO 2 I...

Page 102: ...ER 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 signal is present check for a 4V p p 125 kHz to 133 kHz PWM triangle wave at TP 5 1 If the PWM signal is present defective U22A or U23A 2 If the PWM signal is not present defective U10 Q1 U42A U31A ...

Page 103: ...NDICATOR 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 7 A If the signal is present defective U40A U40B T1 U39A U39B or U39C B If the signal is not present check for a quadrature AM signal at U38 pin 3 1 If the signal is present defective U38A U38B U38C ...

Page 104: ...LEVEL 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 for a 1 kHz 15V p p square wave SIGNAL signal at TP 7 A If the square wave signal is present defective Q22 B If the square wave signal is not present check for a 1 kHz 50 duty cycle square wave signal...

Page 105: ...roadcast 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 TROUBLESHOOTING SYMPTOM CIRCUITRY TO CHECK NO OUTPUT POWER 1 Check the ECU power supply fuse NO NORMAL FAULT 2 Check the ECU power supply assembly ECU INDICATIONS 2 69 COMPONENT REPLACEMENT PROCEDURE Component ...

Page 106: ...X TABLE DESCRIPTION PART NO PAGE 3 2 Exciter Controller Assembly 957 0009 011 3 2 3 3 ECU Exciter Circuit Board Assembly 917 0300 3 2 3 4 VCO Module Circuit Board Assembly 917 0069 3 11 3 5 ECU Motherboard Circuit Board Assembly 917 0301 3 11 3 6 ECU Controller Circuit Board Assembly 917 0205 3 13 3 7 ECU Display Control Switch Circuit Board Assembly 917 0306 001 3 22 3 8 Meter Switch Circuit Boar...

Page 107: ...00 pF 1 100V 041 1031 1 C7 Capacitor Mica 150 pF 5 500V 040 1522 1 C8 Capacitor Monolythic Ceramic 0 1 uF 10 50V 003 1066 1 C9 Capacitor Mica 500 pF 1 500V 042 5021 1 C10 Capacitor Mica 1000 pF 1 100V 041 1031 1 C11 Capacitor Mica 150 pF 5 500V 040 1522 1 C12 Capacitor Monolythic Ceramic 0 1 uF 10 50V 003 1066 1 C14 Capacitor Mica 1000 pF 1 100V 041 1031 1 C15 Capacitor Monolythic Ceramic 0 1 uF 1...

Page 108: ...00V 031 2033 1 C61 C62 Capacitor Electrolytic 10 uF 50V 023 1076 2 C63 thru C67 Capacitor Monolythic Ceramic 0 1 uF 10 50V 003 1066 5 C68 Capacitor Mica 1000 pF 1 100V 041 1031 1 C69 C70 Capacitor Electrolytic 10 uF 50V 023 1076 2 C71 C72 Capacitor Electrolytic 100 uF 35V 023 1084 2 C73 C74 Capacitor Mica 1000 pF 1 100V 041 1031 2 C75 Capacitor Mica 390 pF 5 100V 042 3922 1 C76 Capacitor Monolythi...

Page 109: ...vered Mica 100 pF 5 500V 040 1022 1 C133 C134 Capacitor Mica 33 pF 5 500V 042 3312 2 C135 C136 Capacitor Monolythic Ceramic 0 1 uF 10 50V 003 1066 2 C137 Capacitor Mica 33 pF 5 500V 042 3312 1 C138 Capacitor Monolythic Ceramic 0 1 uF 10 50V 003 1066 1 C140 Capacitor Electrolytic 10 uF 50V 023 1076 1 C141 Capacitor Monolythic Ceramic 0 1 uF 10 50V 003 1066 1 C143 C144 Capacitor Monolythic Ceramic 0...

Page 110: ...ale 3 Pin In line 417 0003 1 J8 thru Receptacle Single Pin 417 0071 001 4 J11 J12 J13 Receptacle Male 20 Pin In Line 417 0200 2 L1 thru L4 Coil Toroid 22 uH 10 34 Turns of No 30 Enameled Copper 360 0049 4 Wire on B E No 360 0023 Form L5 Coil Molded Shielded 56 uH 360 0093 1 L6 Coil Molded 2 2 uH 364 2200 1 P2 thru P5 Jumper Programmable 2 Pin 340 0004 4 P6A P6B Jumper Programmable 2 Pin 340 0004 2...

Page 111: ...esistor 100 k Ohm 1 1 4W 103 1062 1 R35 Resistor 10 k Ohm 1 1 4W 100 1051 1 R36 R37 Resistor 100 k Ohm 1 1 4W 103 1062 2 R38 R39 Resistor 39 2 k Ohm 1 1 4W 100 3951 2 R40 Resistor 221 Ohm 1 1 4W 103 2213 1 R41 Resistor 3 83 k Ohm 1 1 4W 103 3841 1 R41 Potentiometer 20 k Ohm 10 1 2W 178 2054 1 R42 Resistor 20 0 k Ohm 1 1 4W 103 2051 1 R43 thru Resistor 10 k Ohm 1 1 4W 100 1051 12 R54 R55 Resistor 5...

Page 112: ...1062 1 R119 Resistor 121 Ohm 1 1 4W 100 1231 1 R120 Resistor 365 Ohm 1 1 4W 103 3631 1 R121 Resistor 51 1 Ohm 1 1 4W 103 5112 1 R122 thru Resistor 9 53 k Ohm 1 1 4W 103 9534 4 R125 R126 thru Resistor 7 50 k Ohm 1 1 4W 103 7541 3 R128 R129 Resistor 1 k Ohm 1 1 4W 100 1041 1 R130 Resistor 10 Ohm 1 1 4W 103 1021 1 R131 Resistor 4 75 k Ohm 1 1 4W 103 4741 1 R132 Resistor 221 Ohm 1 1 4W 103 2213 1 R133...

Page 113: ...100 1041 1 R181 Resistor 10 k Ohm 1 1 4W 100 1051 1 R182 Resistor 68 1 k Ohm 1 1 4W 103 6815 1 R183 Resistor 7 50 k Ohm 1 1 4W 103 7541 1 R184 Resistor 46 4 k Ohm 1 1 4W 103 4645 1 R185 Resistor 113 k Ohm 5 1 4W 103 1136 1 R186 Resistor 4 75 k Ohm 1 1 4W 103 4741 1 R187 Resistor 18 2 k Ohm 1 1 4W 103 1825 1 R188 Resistor 10 k Ohm 1 1 4W 100 1051 1 R189 Potentiometer 1 k Ohm 10 1 2W 178 1044 1 R190...

Page 114: ...it LM317LZ Adjustable Positive Voltage 220 0317 1 Regulator 1 2 to 37V 0 1 Ampere TO 92 Case U14 thru U17 Amplifier Dual Operational RC4227GNB Raytheon 8 Pin DIP 221 4227 4 U19 U20 Integrated Circuit 74C24ON Inverting Tri State 20 Pin DIP 220 4240 2 U21 Integrated Circuit CD4069CN Hex Inverter CMOS 14 Pin DIP 228 4069 1 U22 Integrated Circuit LM319N Dual Comparator 14 Pin DIP 221 0319 1 U23 Integr...

Page 115: ...in DIP 220 4240 1 U46 Driver High and Low Side IR2112 14 Pin DIP 227 2112 1 U47 Integrated Circuit LM319N Dual Comparator 14 Pin DIP 221 0319 1 XU1 thru Socket 8 Pin DIP 417 0804 6 XU6 XU4 Socket 14 Pin DIP 417 1404 1 XU7 Socket 16 Pin DIP 417 1604 1 XU8 XU9 Socket 8 Pin DIP 417 0804 2 XU10 Socket 16 Pin DIP 417 1604 1 XU11 Socket 14 Pin DIP 417 1404 1 XU12 Socket 8 Pin DIP 417 0804 1 XU14 thru So...

Page 116: ...15 1 Motorola Case 182 03 D2 D3 Diode 1N4148 Silicon 75V 0 3 Amperes 203 4148 2 P32 thru P35 Plug Male Single Pin 417 0119 4 Q1 Q2 Field Effect Transistor J3100 RF N Channel TO 92 Case 212 0310 2 R1 Resistor 619 Ohm 1 1 4W 103 6193 1 R2 Resistor 100 Ohm 1 1 4W 100 1031 1 R3 Resistor 475 Ohm 1 1 4W 103 4753 1 R4 Resistor 100 k Ohm 1 1 4W 103 1062 1 R5 Resistor 100 Ohm 1 1 4W 100 1031 1 R6 Resistor ...

Page 117: ... In Line 417 0254 1 L1 thru L4 Coil Shielded 560 uH 10 Molded 360 0072 4 L5 L6 RF Choke 910 uH 5 79 mA Maximum 15 8 Ohms DC Resistance 360 0047 2 P4 thru P6 Connector 25 Pin D Type 418 2500 3 P12 Switch Jumper Programmable 340 0004 1 R1 Resistor 1 15 k Ohm 1 1 4W 103 1156 1 R2 R3 Resistor 442 Ohm 1 1 4W 103 4423 2 R4 Resistor 1 15 k Ohm 1 1 4W 103 1156 1 R5 Resistor 604 Ohm 1 1 4W 100 6031 1 R6 Re...

Page 118: ...uF 10 50V 003 1066 2 C38 Capacitor Mylar 0 033 uF 80V 038 1049 1 C39 thru Capacitor Monolythic Ceramic 0 1 uF 10 50V 003 1066 10 C48 C49 Capacitor Electrolytic 10 uF 25V Non Polarized 023 1075 1 C50 Capacitor Monolythic Ceramic 0 1 uF 10 50V 003 1066 1 C51 C52 Capacitor Electrolytic 10 uF 25V Non Polarized 023 1075 2 C53 Capacitor Monolythic Ceramic 0 1 uF 10 50V 003 1066 1 C54 thru Capacitor Elec...

Page 119: ...75 1 C111 thru Capacitor Monolythic Ceramic 0 1 uF 10 50V 003 1066 4 C114 C115 Capacitor Monolythic Ceramic 47 uF 20 50V 003 4743 1 C116 Capacitor Electrolytic 10 uF 25V Non Polarized 023 1075 1 C117 C118 Capacitor Monolythic Ceramic 0 1 uF 10 50V 003 1066 2 C121 Capacitor Electrolytic 10 uF 25V Non Polarized 023 1075 1 C122 thru Capacitor Monolythic Ceramic 0 1 uF 10 50V 003 1066 7 C128 C129 Capa...

Page 120: ...Diode 1N4148 Silicon 75V 0 3 Amperes 203 4148 2 D47 thru Diode 1N4148 Silicon 75V 0 3 Amperes 203 4148 5 D51 D53 thru Diode 1N4148 Silicon 75V 0 3 Amperes 203 4148 12 D64 DS1 DS2 Indicator LED Green 521 9175 3V 40 mA Maximum 323 9224 2 DS3 Indicator LED Yellow 521 9176 3V 40 mA Maximum 323 9225 1 E10 Terminal Turret Double Shoulder 413 1597 1 J1 thru Receptacle Male 3 Pin In line 417 0003 3 J3 J4 ...

Page 121: ... 1 1 4W 103 3061 1 R26 thru Resistor 100 k Ohm 1 1 4W 103 1062 3 R28 R29 Resistor 20 0 k Ohm 1 1 4W 103 2051 1 R30 Resistor 100 k Ohm 1 1 4W 103 1062 1 R31 Resistor 301 k Ohm 1 1 4W 103 3061 1 R32 Resistor 10 k Ohm 1 1 4W 100 1051 1 R33 thru Resistor 2 21 k Ohm 1 1 4W 103 2241 3 R35 R36 Resistor 392 Ohm 1 1 4W 103 3923 1 R37 Resistor 240 Ohm 1 1 4W 103 2431 1 R38 Resistor 240 Ohm 1 1 4W 103 2431 1...

Page 122: ... 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 Resistor 3 01 k Ohm 1 1 4W 103 3014 1 R87 Resistor 1 Meg Ohm 1 1 4W 103 1007 1 R88 Resistor 150 k Ohm 1 1 4W 103 1561 1 R89 Resistor 90 9 k Ohm 1 1 4W 103 9095 1 R90 Resistor 1 Meg Ohm 1 1 4W 103 1007 1 R91 Resistor 10 k Ohm 1 1 4W 100 1051 1 R92 Resistor 25 5 k Ohm 1 1 4W 103 2551 1 R93 Resistor...

Page 123: ...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 4W 103 4993 1 R154 R155 Resistor 10 k Ohm 1 1 4W 100 1051 2 R156 Resistor 1 k Ohm 1 1 4W 100 1041 1 R157 Resistor 90 9 k Ohm 1 1 4W 103 9095 1 R158 Resistor 10 k Ohm 1 1 4W 100 1051 1 R159 Resistor 100 k Ohm 1 1 4W 103 1062 1 R160 Resistor 1 k Ohm 1 1 4W 100 1041 1 R161 ...

Page 124: ...2 1W Resistors 8 Pin Single 226 1051 1 In Line Package RN6 RN7 Resistor Network 100 k Ohm 2 2 7W Resistors 10 Pin Single 226 1060 2 In Line Package RN8 Resistor Network 10 k Ohm 2 1W Resistors 8 Pin Single 226 1051 1 In Line Package S1 thru Switch SPST 4 Position 8 Pin DIP Dual In Line 340 0002 3 S3 S4 Switch Miniature Toggle DPDT 0 4 vA Maximum at 20V ac or dc 340 0060 1 S5 Switch Push N O Moment...

Page 125: ...Counter 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 3 Input AND Gate 228 4073 1 CMOS 14 Pin DIP U39 Integrated Circuit MC14051 8 Bit Analog Multiplexer CMOS 220 4051 1 16 Pin DIP U40 Integrated Circuit TLO74CN Quad JFET Input Operational 221 0074 1 A...

Page 126: ...or 14 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 Pin DIP U69 Integrated Circuit CD4075BE RCA 225 0006 1 U70 Integrated Circuit LM317LZ Adjustable Positive Voltage 220 0317 1 Regulator 1 2 to 37V 0 1 Ampere TO 92 Case U71 Integrated Circuit CD40...

Page 127: ...5V 020 1084 3 C33 Capacitor Electrolytic 10 uF 50V 023 1076 1 C34 Capacitor Electrolytic 33 uF 35V 024 3335 1 C35 Capacitor Ceramic 0 001 uF 10 200V 030 1033 1 C36 Capacitor Electrolytic 33 uF 35V 024 3335 1 C37 Capacitor Electrolytic 10 uF 50V 023 1076 1 C38 C39 Capacitor Monolythic Ceramic 0 1 uF 10 50V 003 1066 2 C40 thru C43 Capacitor Ceramic 0 001 uF 10 200V 030 1033 4 D1 thru D9 Diode 1N4148...

Page 128: ...3 1 R13 Resistor 22 1 k Ohm 1 1 4W 103 2211 1 R14 Resistor 221 k Ohm 1 1 4W 103 2216 1 R15 Resistor 10 k Ohm 1 1 4W 100 1051 1 R16 Resistor 10 k Ohm 1 1 4W 100 1051 1 R17 Resistor 2 21 k Ohm 1 1 4W 103 2241 1 R18 Resistor 24 3 k Ohm 1 1 4W 103 2435 1 R19 Resistor 825 Ohm 1 1 4W 103 8253 1 R20 Resistor 1 k Ohm 1 1 4W 100 1041 1 R21 Resistor 22 Meg Ohm 5 1 4W 100 2283 1 R22 Resistor 22 1 k Ohm 1 1 4...

Page 129: ... 1 1 4W 103 8255 1 R73 Resistor 15 k Ohm 5 1 4W 100 1551 1 R74 Resistor 121 Ohm 1 1 4W 100 1231 1 R75 Resistor 604 Ohm 1 1 4W 100 6031 1 R76 R77 Resistor 240 Ohm 1 1 4W 103 2431 2 R78 Resistor 10 k Ohm 1 1 4W 100 1051 1 R79 Resistor 82 5 k Ohm 1 1 4W 103 8255 1 R80 Resistor 15 k Ohm 5 1 4W 100 1551 1 R81 Resistor 499 Ohm 1 1 4W 103 4993 1 R82 Resistor 1 21 k Ohm 1 1 4W 103 1214 1 R83 thru R85 Resi...

Page 130: ...72CP Dual JFET Input Operational 221 0072 1 Amplifier 8 Pin DIP U7 Integrated Circuit DG212CJ QUAD SPST Switch CMOS 220 0212 1 16 Pin DIP U8 Integrated Circuit TLO74CN Quad JFET Input Operational 221 0074 1 Amplifier 14 Pin DIP U9 thru U11 Integrated Circuit LM3914N Dot Bar Display Driver 18 Pin DIP 229 3914 3 U12 U13 Integrated Circuit NE555N Timer 8 Pin DIP 229 0555 2 U14 Integrated Circuit LM31...

Page 131: ...CRIPTION PART NO QTY Connector Female 80 Pin Dual In Line PCB Mount 417 0188 1 Header Right Angle 50 Pin 417 0152 1 ECU Extender Card Support AM XMTR 471 0849 1 Header Right Angle 80 Pin 417 8001 1 Receptacle 50 Pin Dual In line 417 0147 1 Blank ECU Extender Circuit Board AM 1 517 0208 1 TABLE 3 10 STEREO CIRCUIT BOARD ASSEMBLY 917 0209 Sheet 1 of 10 REF DES DESCRIPTION PART NO QTY C1 C2 Capacitor...

Page 132: ... 1066 1 C42 Capacitor Mica 500 pF 1 500V 042 5021 1 C43 Capacitor Mica 1000 pF 1 100V 041 1031 1 C44 Capacitor Silvered Mica 100 pF 5 500V 040 1022 1 C45 Capacitor Monolythic Ceramic 0 1 uF 10 50V 003 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 Ceramic...

Page 133: ...0V 042 8222 1 C119 Capacitor Mica 270 pF 5 300V 041 2722 1 C120 Capacitor Mica 180 pF 5 500V 042 1822 1 C121 Capacitor Mica 620 pF 5 300V 040 6223 1 C122 thru Capacitor Monolythic Ceramic 0 1 uF 10 50V 003 1066 7 C128 C129 C130 Capacitor Electrolytic 10 uF 25V 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 500V 042 3312 1 C...

Page 134: ...mmable 2 Pin 340 0004 2 P3A P3B Jumper Programmable 2 Pin 340 0004 2 P4A P4B Jumper Programmable 2 Pin 340 0004 2 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 2N7000 FET N Channel TO 92 Case 210 7000 12 Q14 R1 Potentiometer 5 k Ohm 10 1W 179 5043 1 R2 Resistor 8 25 k Ohm 1 1 4W 103 8254 1 R3 Resistor 10 k Ohm 1 1 4W 100...

Page 135: ...051 3 R45 R46 thru Resistor 4 99 k Ohm 1 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 Resistor 8 25 k Ohm 1 1 4W 103 8254 1 R55 Resistor 10 k Ohm 1 1 4W 100 1051 1 R56 Resistor 6 04K Ohm 1 1 4W 103 6044 1 R57 Resistor 10 k Ohm 1 1 4W 100 1051 1 R5...

Page 136: ... 4W 100 1041 1 R104 Potentiometer 10 k Ohm 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 Pin DIP R112 Resistor 1 15 k Ohm 1 1 4W 103 1156 1 R113 Resistor 6 04 k Ohm 1 1 4W 103 6044 1 R114 Resistor 100 Ohm 1 1 4W 100 1031 1 R115 Resistor 442 Ohm 1 ...

Page 137: ... 1 4W 103 1823 1 R168 Resistor 240 Ohm 1 1 4W 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 Resistor 240 Ohm 1 1 4W 103 2431 1 R176 Resistor 3 01 k Ohm 1 1 4W 103 3014 1 R177 Resistor 22 1 Ohm 1 1 4W 103 2212 1 R178 Resistor 3 01 k Ohm 1 1 4W 103 3014 1 ...

Page 138: ...30 1 Maximum T1 Transformer 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 2150A Voltage Controlled Amplifier 8 Pin DIP 220 2150 2 U4 thru Integrated Circuit TL072CP Dual JFET Input Operational 221 0072 4 U7 Amplifier 8 Pin DIP U8 U9 Integrated Circuit 21...

Page 139: ...MOS 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 U45 thru Integrated Circuit 4N33 Optical Isolator NPN Photo 229 0033 4 U48 Transistor Infared Emitting Diode Type 1500V Isolation Response 30 kHz Maximum Current 50 mA Maximum 6 Pin DIP U49 Integrat...

Page 140: ... Pin DIP 417 1404 2 XU53 Socket 16 Pin DIP 417 1604 1 XU54 XU55 Socket 14 Pin DIP 417 1404 2 Socket Spacer LED 407 0074 1 Switch Cap Red 343 6331 1 Blank Stereo Circuit Board AM1 AM5 517 0209 1 TABLE 3 11 ECU HARNESS ASSEMBLY 947 0153 REF DES DESCRIPTION PART NO QTY P1 Housing SL 156 3 Position 417 0306 1 P1 Plug Ribbon Cable 26 Pin Dual In line 418 2600 1 P2 Plug 40 Pin Dual In line 417 0118 1 P2...

Page 141: ...17 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 BOARD 4 9 SCHEMATIC DIAGRAM STEREO CIRCUIT BOARD SD917 0209 4 10 ASSEMBLY DIAGRAM STEREO CIRCUIT BOARD AC917 0209 4 11 COMPONENT LOCATOR ECU STEREO BOARD 4 12 SCHEMATIC DIAGRAM ECU DISPLAY CONTROL SB91...

Search results

Summary of Contents for AM-10A

Reviews:

Broadcast Electronics AM-10A, Manual, Page: 123 / 141

Search results

Summary of Contents for AM-10A

Reviews: